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WO2018107987A1 - Current detection device, current detection system and current detection method - Google Patents

Current detection device, current detection system and current detection method Download PDF

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Publication number
WO2018107987A1
WO2018107987A1 PCT/CN2017/114372 CN2017114372W WO2018107987A1 WO 2018107987 A1 WO2018107987 A1 WO 2018107987A1 CN 2017114372 W CN2017114372 W CN 2017114372W WO 2018107987 A1 WO2018107987 A1 WO 2018107987A1
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WIPO (PCT)
Prior art keywords
current
signal
current detecting
detection signal
sensing device
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PCT/CN2017/114372
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French (fr)
Chinese (zh)
Inventor
刘海宁
程捷
李冠南
葛学伟
孙晓庆
王玉军
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联合汽车电子有限公司
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Application filed by 联合汽车电子有限公司 filed Critical 联合汽车电子有限公司
Publication of WO2018107987A1 publication Critical patent/WO2018107987A1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques

Definitions

  • the invention relates to the technical field of automotive electronics, and in particular to a current detecting device, a current detecting system and a current detecting method.
  • the Hall-type current sensor is composed of a Hall chip and a magnetically permeable ring.
  • the straight wire passes through the magnetically permeable ring.
  • the wire current generates an induced magnetic field in the magnetically permeable ring.
  • the Hall chip senses the strength of the magnetic field in the magnetically permeable ring.
  • the amount of current in the wire is measured indirectly.
  • the measurement of the Hall sensor is a non-contact measurement, which can measure a large current value, the sampling circuit is simple, high voltage isolation is not required, and the cost is low.
  • the main sensitive component of the high-precision shunt resistor current sensor is a high-precision shunt resistor connected in series in the main loop. By measuring the voltage drop across the high-precision shunt resistor, the current flowing through the high-precision shunt resistor is measured indirectly. High precision and high cost.
  • the current battery management system requires a current sensor with an accuracy error of less than 0.5%.
  • the system safety needs to meet the safety level of ASIL C, and the current and voltage sampling have synchronization requirements.
  • the Hall-type current sensor is a non-contact measurement with low measurement accuracy and large temperature drift, which can not meet the current battery management system requirements of 0.5% current accuracy.
  • the current battery management system requires simultaneous sampling of voltage and current, and the sensor itself does not need sampling circuit and isolation circuit, so in order to achieve simultaneous voltage sampling, the system needs to add additional voltage detection circuit structure, including sampling circuit and isolation. Circuits, etc., have brought about a substantial increase in cost.
  • the high-precision shunt resistor current sensor uses direct measurement to measure, and the sampling circuit is required for voltage and current sampling.
  • the sampling method has high precision, but if the safety level of ASIL C is to be achieved, circuit redundancy design is required, and it is usually necessary to add one current signal sampling and isolation. This leads to an increase in the cost of the chip, which in turn leads to a 50% increase in the cost of the product.
  • An object of the present invention is to provide a current detecting device, a current detecting system, and a current detecting method, which solve the problem of high current detecting cost of the conventional battery management system.
  • the present invention provides a current detecting device for a battery management system, the current detecting device including a current signal port, a first sensing device, and a second sensing device, wherein:
  • the first sensing device is configured to detect a current flowing through the current signal port and obtain a first current detection signal
  • the second sensing device is configured to detect a current flowing through the first sensing device and obtain a second current detecting signal.
  • the first sensing device is a shunt resistor
  • the second sensing device is a Hall current sensor
  • the Hall current sensor includes a magnetic flux ring and a Hall chip, and the magnetic conductive ring is sleeved outside the shunt resistor and induced by a current flowing through the shunt resistor. A magnetic field strength, the Hall chip detects a magnetic field strength in the magnetically permeable ring to obtain a second current detection signal.
  • the first sensing device is a shunt resistor
  • the second sensing device is a fluxgate sensor device.
  • the fluxgate sensor device includes a magnetic flux ring and a detecting circuit, and the magnetic conductive ring is sleeved outside the shunt resistor and has a sense of current flowing through the shunt resistor A magnetic field strength is applied, and the detecting circuit detects the magnetic field strength in the magnetically permeable ring to obtain a second current detecting signal.
  • the current detecting device further includes a magnetic flux ring bracket, and the magnetic flux ring bracket is configured to fix the magnetic conductive ring on the shunt resistor.
  • the first sensing device is a Hall current sensor
  • the second sensing device is a shunt resistor
  • the first sensing device is a fluxgate sensor device
  • the second sensing device is a shunt resistor
  • the present invention also provides a current detecting system including a current detecting device, a controller, and a signal processor, wherein:
  • the current detecting device is connected to the signal processor, and sends a first current detecting signal to a signal processor, wherein the signal processor processes the first current detecting signal;
  • the current detecting device is connected to the controller, and sends a second current detecting signal to the controller, and the controller receives the second current detecting signal;
  • the signal processor is connected to the controller, and sends the first current detection signal to a controller, the controller receives the first current detection signal, and the first current detection signal and the first The two current detection signals are compared to obtain a final detection signal.
  • the current detecting device comprises a current signal port, a first sensing device and a second sensing device, wherein:
  • the first sensing device is configured to detect a current flowing through the current signal port and obtain the first current detection signal
  • the second sensing device is configured to detect a current flowing through the first sensing device and obtain the second current detecting signal.
  • the second sensing device uses the second current Sending a detection signal to the controller, the first sensing device transmitting the first current detection signal to the signal processor, the signal processor processing the first current detection signal, and transmitting To the controller, the controller processes the first current detection signal and the second current detection signal to obtain a final detection signal.
  • the signal processor comprises an AD conversion chip and an isolation chip.
  • the current detecting system further includes a voltage dividing resistor, the voltage dividing resistor is connected to the signal processor, and the voltage dividing resistor is configured to detect a voltage signal and A voltage signal is sent to the signal processor.
  • the current detecting system further includes a thermistor device, configured to perform the first current detecting signal and the second current detecting signal Temperature compensation.
  • the invention also provides a current detecting method, the current detecting method comprising:
  • the first sensing device detects a current flowing through the current signal port to obtain a first current detecting signal, and transmits the first current detecting signal to a signal processor;
  • the signal processor signals the first current detection signal and sends it to the controller
  • the second sensing device detects a current flowing through the first sensing device to obtain a second current detecting signal, and transmits the second current detecting signal to the controller;
  • the controller After receiving the first current detection signal and the second current detection signal, the controller compares the first current detection signal and the second current detection signal, if the difference between the first current detection signal and the second current detection signal is Within the threshold range, the first current detection signal is used as the final detection signal.
  • the current detecting method may further include:
  • the controller re-receives the first current detection signal and the second current detection signal.
  • the current flowing through the current signal port is detected by the first sensing device and a first current detecting signal is obtained, and the second sensing device detects flowing through the first sensing
  • the current of the device is obtained by the second current detecting signal, so that the second sensing device directly obtains the second current detecting signal based on the first current detecting signal, which is different from the current on the detecting wire used by the conventional non-contact sensor.
  • the invention makes the second sensing device directly nested on the first sensing device, and the first sensing device and the second sensing device are integrated in the same structure, so that the overall structure of the sensing device is small and the integration degree is high. Rugged, reliable, and easy to understand circuit connections.
  • the first current detecting signal and the second current detecting signal transmitted by the current detecting device satisfy the safety level requirement of the current detecting device of the battery management system, and the control is performed by the control
  • the device directly receives the second current detection signal without a signal processor such as a redundant AD conversion circuit.
  • the invention adopts a high-precision shunt resistor as the main current collecting sensor, and the sampling precision can reach 0.5%, and the Hall sensor is used as the redundant current sampling part, and the Hall sensor can be directly connected to the controller, thereby reducing the AD conversion circuit.
  • Equal signal processing reduces the cost of the dual AD sampling high-precision shunt resistor current scheme and simplifies the circuit.
  • the Hall sensor current sampling can verify the high-precision shunt resistor current sampling, which can meet the battery management system safety level ASIL C. Demand.
  • the voltage signal is detected by the voltage dividing resistor and the voltage signal is sent to the signal processor to realize synchronous sampling of current and voltage. There is no need to add additional AD conversion circuits and isolation circuits, and the system is simple and low in cost.
  • Figure 1 is a structural view of a current detecting device of the present invention
  • FIG. 2 is a structural diagram of a current detecting system of the present invention
  • the figure shows: 1-current detecting device; 11-first sensing device; 12-second sensing device; 121-magnetic ring; 122-Hall chip; 13-upper casing; 14-lower casing 15-PCB board; 16-magnetic ring bracket; 2-controller; 3-signal processor; 31-AD conversion chip; 32-isolated chip; 4-voltage divider; 5-thermistor device; Communication module; 7-linear regulator chip; 8-reference voltage chip.
  • the core idea of the present invention is to provide a low-cost current detecting device, a current detecting system, and a current detecting method.
  • the present invention provides a current detecting device, a current detecting system, and a current detecting method, the current detecting device including a current signal port, a first sensing device, and a second sensing device, wherein: A sensing device detects a current flowing through the current signal port and obtains a first current detecting signal; the second sensing device detects a current flowing through the first sensing device and obtains a second current detecting signal.
  • the present embodiment provides a current detecting device 1 for a battery management system, the current detecting device 1 including a current signal port.
  • the technical solution has two current acquisitions.
  • the high-precision shunt resistor is used as the sensitive component of the main signal acquisition, and the Hall sensor is used as the sensitive component of the redundant signal acquisition, and the two are integrated into a new sensor scheme.
  • the first sensing device 11 is a shunt resistor
  • the second sensing device 12 is a Hall current sensor.
  • the Hall current sensor includes a magnetic flux ring 121 and a Hall chip 122, and the magnetic flux ring 121 is sleeved on the shunt resistor, that is, outside the first sensing device 11 and is induced by current flowing through the first sensing device.
  • a magnetic field strength is detected, and the Hall chip 122 detects the intensity of the magnetic field in the magnetically permeable ring 121 to obtain a second current detecting signal.
  • a fluxgate sensor can also be used instead of the Hall sensor to achieve the same function, so the second sensing device can also be a fluxgate sensor device.
  • the fluxgate sensor device includes a magnetic flux ring 121 and a detecting circuit, and the magnetic conductive ring 121 is sleeved outside the shunt resistor and induces a magnetic field strength by a current flowing through the first sensing device, the detecting circuit Detecting the strength of the magnetic field in the magnetically permeable ring to obtain a second current detection signal.
  • the current detecting device further includes a magnetic flux ring holder 16 for fixing the magnetic conductive ring 121 to the shunt resistor, that is, the first sensing device 11.
  • the high-precision shunt resistor passes through the inner diameter of the magnetically permeable ring and is positioned and connected by the magnetic flux ring bracket.
  • the Hall sensor detects the current flowing through the high-precision shunt resistor instead of detecting the current on the wire.
  • the high-precision shunt resistor is used to accurately detect the current in the main circuit. After temperature compensation and calibration, the accuracy can reach 0.5%, which can meet the accuracy requirements of the battery management system.
  • the current value of the high-precision shunt resistor is used in the current detection system. Signal processing, and the current detected by the Hall sensor is used as a redundant signal to verify the accuracy of high-accuracy shunt resistor current acquisition.
  • the sampling circuit only needs to collect one high-precision shunt resistor current signal to meet the safety level requirement, that is, the use of one-way AD sampling and isolation can meet the voltage and current synchronous acquisition requirements, simplifying the circuit, reducing the number of chips, and reducing cost.
  • the Hall current sensor can be verified by using a signal collected by a high-precision sampling shunt resistor to improve the accuracy of the Hall current sensor, and the same function is achieved, that is, the first sensing device is a Hall current sensor. Or a fluxgate sensor device, the second sensing device being a shunt resistor.
  • the first sensing device is configured to detect a current flowing through the current signal port and obtain a first current detecting signal
  • the second sensing device is configured to detect a current Passing the current of the first sensing device and obtaining the second current detecting signal, so that the second sensing device directly obtains the second current detecting signal based on the current of the first sensing device, which is different from the traditional non-contact sensor.
  • the present invention allows the second sensing device to be directly nested on the first sensing device, and the first sensing device and the second sensing device are integrated in the same structure to make the overall structure of the sensing device Small, highly integrated, rugged, reliable, and easy to understand circuit connections.
  • the current detecting device 1 further includes an upper casing 13, a lower casing 14, and a PCB board 15 for carrying other signal processing chips and microprocessor chips for fixing and packaging.
  • the above embodiments describe the different configurations of the current detecting device in detail.
  • the present invention includes, but is not limited to, the configurations listed in the above embodiments, and any changes are made based on the configuration provided by the above embodiments.
  • the contents are all within the scope of protection of the present invention. Those skilled in the art can make the same according to the content of the above embodiments.
  • the embodiment further provides a current detecting system including a current detecting device 1, a controller 2 and a signal processor 3, wherein: The current detecting device 1 is connected to the signal processor 3, and sends the first current detecting signal to the signal processor 3, and the signal processor processes the first current detecting signal; the current detecting device 1 connecting the controller 2, sending the second current detection signal to a controller 2, the controller receives the second current detection signal; the signal processor 3 is connected to the controller 2, and sends the first current detection signal to a controller, the controller receives the The first current detection signal compares the first current detection signal and the second current detection signal to obtain a final detection signal.
  • the current detecting device 1 includes a current signal port, a first sensing device 11 and a second sensing device 12, wherein: the first sensing device 11 is configured to detect A current flowing through the current signal port and a first current detection signal is obtained; the second sensing device 12 is configured to detect a current flowing through the first sensing device and obtain a second current detection signal.
  • the second sensing device 12 is a Hall current sensor.
  • the Hall current sensor includes a magnetic flux ring 121 and a Hall chip 122.
  • the magnetic flux ring 121 is sleeved on the shunt resistor, that is, outside the first sensing device 11 and induces a magnetic field strength by the first current detecting signal.
  • the Hall chip 122 detects the intensity of the magnetic field in the magnetically permeable ring 121 to obtain a second current detection signal.
  • the second sensing device 12 transmits the second current detecting signal to the controller 2, and the first sensing device 11 will be the first
  • the current detection signal is sent to the signal processor 3, and the signal processor 3 processes the first current detection signal and sends it to the controller 2, and the controller 2 detects the first current
  • the signal and the second current detection signal are processed to obtain a final detection signal.
  • the signal processor 3 includes an AD conversion chip 31 and an isolation chip 32.
  • the current detecting system further includes a voltage dividing resistor 4 and a thermistor device 5, the voltage dividing resistor 4 is connected to the signal processor 3, and the voltage dividing resistor 4 is configured to detect a voltage signal and send the voltage signal To the signal processor 3; in the current detecting system provided in this embodiment, the voltage signal is detected by the voltage dividing resistor and the voltage signal is sent to the signal processor, so that current and voltage synchronous sampling is realized, and Adding additional AD conversion circuits and isolation circuits makes the system simple and low cost.
  • the thermistor device 5 is configured to detect the first current and the current
  • the second current detection signal is temperature compensated to provide accuracy and accuracy of the current detection signal.
  • the current detecting system in this embodiment further includes a communication module 6, a linear regulator chip 7, and a reference voltage chip 8 for various other functions in the system.
  • the first current detecting signal and the second current detecting signal sent by the current detecting device 1 satisfy the safety level requirement of the current detecting device of the battery management system, and the controller 2 is passed through the controller 2
  • the second current detection signal is directly received, and a signal processor such as a redundant AD conversion circuit is not required.
  • the invention adopts a high-precision shunt resistor as the main current collecting sensor, and the sampling precision can reach 0.5%, and the Hall sensor is used as the redundant current sampling part, and the Hall sensor can be directly connected to the controller, thereby reducing the AD conversion circuit.
  • Equal signal processing reduces the cost of the dual AD sampling high-precision shunt resistor current scheme and simplifies the circuit.
  • the Hall sensor current sampling can verify the high-precision shunt resistor current sampling, which can meet the battery management system safety level ASIL C. Demand.
  • the voltage signal is detected by the voltage dividing resistor 4 and the voltage signal is sent to the signal processor 3 to realize current-voltage synchronization. Sampling, without the need to add additional AD conversion circuits and isolation circuits, the system is simple and low cost.
  • the embodiment provides a current detecting method for a current detecting system.
  • the current detecting method includes: the first sensing device detects a current flowing through the current signal port and obtains a first current detecting signal, and the first sensing The device transmits the first current detection signal to a signal processor; the signal processor performs signal processing on the first current detection signal and transmits to the controller; and the second sensing device detects flowing through the first transmission Sensing the current of the device and obtaining a second current detecting signal, the second sensing device transmitting the second current detecting signal to the controller, the controller receiving the first current detecting After measuring the signal and the second current detection signal, comparing the first current detection signal and the second current detection signal, if the difference between the first current detection signal and the second current detection signal is within a threshold range, the first current is The detection signal is used as the final detection signal.
  • the current detecting method of the current detecting system may further include: if the difference between the first current detecting signal and the second current detecting signal exceeds a threshold range, the controller re-receives the first current detecting signal and the second current detecting signal.
  • the first sensing device is configured to detect a current flowing through the current signal port and obtain a first current detecting signal
  • the second sensing device It is used for detecting the current flowing through the first sensing device and obtaining the second current detecting signal, which satisfies the safety level requirement of the current detecting device of the battery management system, and adopts a high-precision shunt resistor as the main current collecting sensor, and the sampling precision can be achieved.
  • Hall sensor can be directly connected to the controller, reducing signal processing such as AD conversion circuit, reducing the cost of dual AD sampling high-precision shunt resistor current scheme, simplifying The circuit part, while the Hall sensor current sampling can verify the high-precision shunt resistor current sampling, can meet the needs of the battery management system safety level ASIL C.

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Abstract

A current detection device (1), a current detection system and a current detection method, the current detection device (1) comprising a current signal port, a first sensing device (11) and a second sensing device (12), wherein: the first sensing device (11) detects a current flowing through the current signal port and obtains a first current detection signal; the second sensing device (12) detects a current flowing through the first sensing device (11) and obtains a second current detection signal, wherein the first sensing device (11) is a shunt resistor, and the second sensing device (12) is a Hall-effect current sensor or a fluxgate sensing device; and a controller (2) in the current detection system processes the first current detection signal and the second current detection signal to obtain a final detection signal.

Description

电流检测装置、电流检测系统及电流检测方法Current detecting device, current detecting system and current detecting method 技术领域Technical field
本发明涉及汽车电子技术领域，特别涉及一种电流检测装置、电流检测系统及电流检测方法。The invention relates to the technical field of automotive electronics, and in particular to a current detecting device, a current detecting system and a current detecting method.
背景技术Background technique
现在的动力电池管理系统用电流传感器主要有两种形式，霍尔式电流传感器和高精度分流电阻式电流传感器。霍尔式电流传感器是由霍尔芯片和导磁环两部分组成，直导线穿过导磁环，导线电流在导磁环中产生感应磁场，霍尔芯片通过感应导磁环中的磁场强度，间接测得导线中的电流大小。霍尔传感器的测量是非接触式的测量，可以测量较大的电流值，采样电路简单，无须高压隔离且成本低。高精度分流电阻式电流传感器的主要敏感器件是高精度分流电阻，串联在主回路当中，通过测量高精度分流电阻两端的压降值，间接来测量流过高精度分流电阻的电流，该测量方式精度高，成本高。There are two main types of current sensors for power battery management systems, Hall-type current sensors and high-precision shunt resistor current sensors. The Hall-type current sensor is composed of a Hall chip and a magnetically permeable ring. The straight wire passes through the magnetically permeable ring. The wire current generates an induced magnetic field in the magnetically permeable ring. The Hall chip senses the strength of the magnetic field in the magnetically permeable ring. The amount of current in the wire is measured indirectly. The measurement of the Hall sensor is a non-contact measurement, which can measure a large current value, the sampling circuit is simple, high voltage isolation is not required, and the cost is low. The main sensitive component of the high-precision shunt resistor current sensor is a high-precision shunt resistor connected in series in the main loop. By measuring the voltage drop across the high-precision shunt resistor, the current flowing through the high-precision shunt resistor is measured indirectly. High precision and high cost.
当前电池管理系统对电流传感器的要求是精度误差低于0.5％，系统安全需满足ASIL C的安全等级，且对电流电压采样有同步性要求。The current battery management system requires a current sensor with an accuracy error of less than 0.5%. The system safety needs to meet the safety level of ASIL C, and the current and voltage sampling have synchronization requirements.
霍尔式电流传感器是非接触式测量，测量的精度低，温漂大，满足不了目前电池管理系统对电流精度0.5％的要求。且目前的电池管理系统要求电压电流同步采样，而该类传感器本身不需要采样电路及隔离电路，因此若要实现同时电压采样，系统中还需要增加额外的电压检测电路结构，包括采样电路及隔离电路等，随之带来成本的大幅增加。The Hall-type current sensor is a non-contact measurement with low measurement accuracy and large temperature drift, which can not meet the current battery management system requirements of 0.5% current accuracy. And the current battery management system requires simultaneous sampling of voltage and current, and the sensor itself does not need sampling circuit and isolation circuit, so in order to achieve simultaneous voltage sampling, the system needs to add additional voltage detection circuit structure, including sampling circuit and isolation. Circuits, etc., have brought about a substantial increase in cost.
高精度分流电阻式电流传感器采用直接测量的方式进行测量，需要采样电路进行电压电流采样。该采样方式精度高，但如果要达到ASIL C的安全等级，则需要进行电路冗余设计，通常需要增加一路电流信号采样及隔离，由 此导致芯片成本增加，随之导致了产品的成本增加50％左右。The high-precision shunt resistor current sensor uses direct measurement to measure, and the sampling circuit is required for voltage and current sampling. The sampling method has high precision, but if the safety level of ASIL C is to be achieved, circuit redundancy design is required, and it is usually necessary to add one current signal sampling and isolation. This leads to an increase in the cost of the chip, which in turn leads to a 50% increase in the cost of the product.
因此，需要设计一种低成本的电流检测装置、电流检测系统及电流检测方法。Therefore, it is necessary to design a low-cost current detecting device, a current detecting system, and a current detecting method.
发明内容Summary of the invention
本发明的目的在于提供一种电流检测装置、电流检测系统及电流检测方法，以解决现有的电池管理系统的电流检测成本高的问题。An object of the present invention is to provide a current detecting device, a current detecting system, and a current detecting method, which solve the problem of high current detecting cost of the conventional battery management system.
为解决上述技术问题，本发明提供一种电流检测装置，所述电流检测装置用于电池管理系统，所述电流检测装置包括电流信号端口、第一传感装置和第二传感装置，其中：In order to solve the above technical problem, the present invention provides a current detecting device for a battery management system, the current detecting device including a current signal port, a first sensing device, and a second sensing device, wherein:
所述第一传感装置用于检测流过所述电流信号端口的电流并得到第一电流检测信号；The first sensing device is configured to detect a current flowing through the current signal port and obtain a first current detection signal;
所述第二传感装置用于检测流过第一传感装置的电流并得到第二电流检测信号。The second sensing device is configured to detect a current flowing through the first sensing device and obtain a second current detecting signal.
可选的，在所述的电流检测装置中，所述第一传感装置为分流电阻，所述第二传感装置为霍尔电流传感器。Optionally, in the current detecting device, the first sensing device is a shunt resistor, and the second sensing device is a Hall current sensor.
可选的，在所述的电流检测装置中，所述霍尔电流传感器包括导磁环和霍尔芯片，所述导磁环套在所述分流电阻外侧并由流过分流电阻的电流感应出一磁场强度，所述霍尔芯片检测所述导磁环内的磁场强度得到第二电流检测信号。Optionally, in the current detecting device, the Hall current sensor includes a magnetic flux ring and a Hall chip, and the magnetic conductive ring is sleeved outside the shunt resistor and induced by a current flowing through the shunt resistor. A magnetic field strength, the Hall chip detects a magnetic field strength in the magnetically permeable ring to obtain a second current detection signal.
可选的，在所述的电流检测装置中，所述第一传感装置为分流电阻，所述第二传感装置为磁通门传感器装置。Optionally, in the current detecting device, the first sensing device is a shunt resistor, and the second sensing device is a fluxgate sensor device.
可选的，在所述的电流检测装置中，所述磁通门传感器装置包括导磁环和检测电路，所述导磁环套在所述分流电阻外侧并由流过分流电阻的电流感 应出一磁场强度，所述检测电路检测所述导磁环内的磁场强度得到第二电流检测信号。Optionally, in the current detecting device, the fluxgate sensor device includes a magnetic flux ring and a detecting circuit, and the magnetic conductive ring is sleeved outside the shunt resistor and has a sense of current flowing through the shunt resistor A magnetic field strength is applied, and the detecting circuit detects the magnetic field strength in the magnetically permeable ring to obtain a second current detecting signal.
可选的，在所述的电流检测装置中，所述电流检测装置还包括导磁环支架，所述导磁环支架用于将所述导磁环固定在所述分流电阻上。Optionally, in the current detecting device, the current detecting device further includes a magnetic flux ring bracket, and the magnetic flux ring bracket is configured to fix the magnetic conductive ring on the shunt resistor.
可选的，在所述的电流检测装置中，所述第一传感装置为霍尔电流传感器，所述第二传感装置为分流电阻。Optionally, in the current detecting device, the first sensing device is a Hall current sensor, and the second sensing device is a shunt resistor.
可选的，在所述的电流检测装置中，所述第一传感装置为磁通门传感器装置，所述第二传感装置为分流电阻。Optionally, in the current detecting device, the first sensing device is a fluxgate sensor device, and the second sensing device is a shunt resistor.
本发明还提供一种电流检测系统，所述电流检测系统包括电流检测装置、控制器和信号处理器，其中：The present invention also provides a current detecting system including a current detecting device, a controller, and a signal processor, wherein:
所述电流检测装置连接所述信号处理器，将第一电流检测信号发送给信号处理器，所述信号处理器对所述第一电流检测信号进行处理；The current detecting device is connected to the signal processor, and sends a first current detecting signal to a signal processor, wherein the signal processor processes the first current detecting signal;
所述电流检测装置连接所述控制器，将第二电流检测信号发送给控制器，所述控制器接收所述第二电流检测信号；The current detecting device is connected to the controller, and sends a second current detecting signal to the controller, and the controller receives the second current detecting signal;
所述信号处理器连接所述控制器，将所述第一电流检测信号发送给控制器，所述控制器接收所述第一电流检测信号，并将所述第一电流检测信号和所述第二电流检测信号进行比较得到最终检测信号。The signal processor is connected to the controller, and sends the first current detection signal to a controller, the controller receives the first current detection signal, and the first current detection signal and the first The two current detection signals are compared to obtain a final detection signal.
可选的，在所述的电流检测系统中，所述电流检测装置包括电流信号端口、第一传感装置和第二传感装置，其中：Optionally, in the current detecting system, the current detecting device comprises a current signal port, a first sensing device and a second sensing device, wherein:
所述第一传感装置用于检测流过所述电流信号端口的电流并得到所述第一电流检测信号；The first sensing device is configured to detect a current flowing through the current signal port and obtain the first current detection signal;
所述第二传感装置用于检测流过所述第一传感装置的电流并得到所述第二电流检测信号。The second sensing device is configured to detect a current flowing through the first sensing device and obtain the second current detecting signal.
可选的，在所述的电流检测系统中，所述第二传感装置将所述第二电流 检测信号发送给所述控制器，所述第一传感装置将所述第一电流检测信号发送给所述信号处理器，所述信号处理器将所述第一电流检测信号进行处理后，发送给所述控制器，所述控制器将所述第一电流检测信号和所述第二电流检测信号进行处理得到最终检测信号。Optionally, in the current detecting system, the second sensing device uses the second current Sending a detection signal to the controller, the first sensing device transmitting the first current detection signal to the signal processor, the signal processor processing the first current detection signal, and transmitting To the controller, the controller processes the first current detection signal and the second current detection signal to obtain a final detection signal.
可选的，在所述的电流检测系统中，所述信号处理器包括AD转换芯片和隔离芯片。Optionally, in the current detecting system, the signal processor comprises an AD conversion chip and an isolation chip.
可选的，在所述的电流检测系统中，所述电流检测系统还包括分压电阻，所述分压电阻连接所述信号处理器，所述分压电阻用于检测电压信号并将所述电压信号发送给所述信号处理器。Optionally, in the current detecting system, the current detecting system further includes a voltage dividing resistor, the voltage dividing resistor is connected to the signal processor, and the voltage dividing resistor is configured to detect a voltage signal and A voltage signal is sent to the signal processor.
可选的，在所述的电流检测系统中，所述电流检测系统还包括热敏电阻装置，所述热敏电阻装置用于对所述第一电流检测信号和所述第二电流检测信号进行温度补偿。Optionally, in the current detecting system, the current detecting system further includes a thermistor device, configured to perform the first current detecting signal and the second current detecting signal Temperature compensation.
本发明还提供一种电流检测方法，所述电流检测方法包括：The invention also provides a current detecting method, the current detecting method comprising:
第一传感装置检测流过所述电流信号端口的电流以得到第一电流检测信号，并将所述第一电流检测信号发送给信号处理器；The first sensing device detects a current flowing through the current signal port to obtain a first current detecting signal, and transmits the first current detecting signal to a signal processor;
信号处理器将所述第一电流检测信号进行信号处理并发送给控制器；The signal processor signals the first current detection signal and sends it to the controller;
第二传感装置检测流过所述第一传感装置的电流以得到第二电流检测信号，并将所述第二电流检测信号发送给控制器；The second sensing device detects a current flowing through the first sensing device to obtain a second current detecting signal, and transmits the second current detecting signal to the controller;
所述控制器接收到第一电流检测信号和第二电流检测信号后，对第一电流检测信号和第二电流检测信号进行比较，若第一电流检测信号和第二电流检测信号的差值在阈值范围内，则将第一电流检测信号作为最终检测信号。After receiving the first current detection signal and the second current detection signal, the controller compares the first current detection signal and the second current detection signal, if the difference between the first current detection signal and the second current detection signal is Within the threshold range, the first current detection signal is used as the final detection signal.
可选的，所述电流检测方法还可包括：Optionally, the current detecting method may further include:
若第一电流检测信号和第二电流检测信号的差值超过阈值范围，则控制器重新接收第一电流检测信号和第二电流检测信号。 If the difference between the first current detection signal and the second current detection signal exceeds a threshold range, the controller re-receives the first current detection signal and the second current detection signal.
在本发明提供的电流检测装置中，通过所述第一传感装置检测流过所述电流信号端口的电流并得到第一电流检测信号，所述第二传感装置检测流过第一传感装置的电流并得到第二电流检测信号，使第二传感装置在第一电流检测信号的基础上直接得到第二电流检测信号，不同于传统式非接触式传感器采用的检测导线上的电流，本发明使第二传感装置直接嵌套在第一传感装置上，通过采用第一传感装置和第二传感装置集成在同一结构中，使传感装置整体结构小，集成度高，坚固耐用，可靠性高，且电路连接清晰易懂。In the current detecting device provided by the present invention, the current flowing through the current signal port is detected by the first sensing device and a first current detecting signal is obtained, and the second sensing device detects flowing through the first sensing The current of the device is obtained by the second current detecting signal, so that the second sensing device directly obtains the second current detecting signal based on the first current detecting signal, which is different from the current on the detecting wire used by the conventional non-contact sensor. The invention makes the second sensing device directly nested on the first sensing device, and the first sensing device and the second sensing device are integrated in the same structure, so that the overall structure of the sensing device is small and the integration degree is high. Rugged, reliable, and easy to understand circuit connections.
在本发明提供的电流检测系统及电流检测方法中，通过电流检测装置发送的第一电流检测信号和第二电流检测信号，满足了电池管理系统的电流检测装置的安全等级要求，通过所述控制器直接接收所述第二电流检测信号，无需冗余的AD转换电路等信号处理器。In the current detecting system and the current detecting method provided by the present invention, the first current detecting signal and the second current detecting signal transmitted by the current detecting device satisfy the safety level requirement of the current detecting device of the battery management system, and the control is performed by the control The device directly receives the second current detection signal without a signal processor such as a redundant AD conversion circuit.
具体的，本发明采用高精度分流电阻作为主电流采集传感器，采样精度能达到0.5％，采用霍尔传感器作为冗余电流采样部分，霍尔传感器可直接连接到控制器上，减少了AD转换电路等信号处理，降低了双AD采样高精度分流电阻电流方案的成本，简化了电路部分，同时霍尔传感器电流采样可以对高精度分流电阻电流采样进行校验，可以满足电池管理系统安全等级ASIL C的需求。Specifically, the invention adopts a high-precision shunt resistor as the main current collecting sensor, and the sampling precision can reach 0.5%, and the Hall sensor is used as the redundant current sampling part, and the Hall sensor can be directly connected to the controller, thereby reducing the AD conversion circuit. Equal signal processing reduces the cost of the dual AD sampling high-precision shunt resistor current scheme and simplifies the circuit. At the same time, the Hall sensor current sampling can verify the high-precision shunt resistor current sampling, which can meet the battery management system safety level ASIL C. Demand.
进一步的，在本发明提供的电流检测装置、电流检测系统及电流检测方法中，通过所述分压电阻检测所述电压信号并将电压信号发送给所述信号处理器，实现电流电压同步采样，且无需增加额外的AD转换电路和隔离电路，系统简单，成本低。Further, in the current detecting device, the current detecting system, and the current detecting method provided by the present invention, the voltage signal is detected by the voltage dividing resistor and the voltage signal is sent to the signal processor to realize synchronous sampling of current and voltage. There is no need to add additional AD conversion circuits and isolation circuits, and the system is simple and low in cost.
附图说明DRAWINGS
图1是本发明电流检测装置结构图； Figure 1 is a structural view of a current detecting device of the present invention;
图2是本发明电流检测系统架构图；2 is a structural diagram of a current detecting system of the present invention;
图中所示：1-电流检测装置；11-第一传感装置；12-第二传感装置；121-导磁环；122-霍尔芯片；13-上壳体；14-下壳体；15-PCB板；16-导磁环支架；2-控制器；3-信号处理器；31-AD转换芯片；32-隔离芯片；4-分压电阻；5-热敏电阻装置；6-通信模块；7-线性稳压芯片；8-参考电压芯片。The figure shows: 1-current detecting device; 11-first sensing device; 12-second sensing device; 121-magnetic ring; 122-Hall chip; 13-upper casing; 14-lower casing 15-PCB board; 16-magnetic ring bracket; 2-controller; 3-signal processor; 31-AD conversion chip; 32-isolated chip; 4-voltage divider; 5-thermistor device; Communication module; 7-linear regulator chip; 8-reference voltage chip.
具体实施方式detailed description
以下结合附图和具体实施例对本发明提出的电流检测装置、电流检测系统及电流检测方法作进一步详细说明。根据下面说明和权利要求书，本发明的优点和特征将更清楚。需说明的是，附图均采用非常简化的形式且均使用非精准的比例，仅用以方便、明晰地辅助说明本发明实施例的目的。The current detecting device, current detecting system and current detecting method proposed by the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will be apparent from the description and appended claims. It should be noted that the drawings are in a very simplified form and all use non-precise proportions, and are only for convenience and clarity to assist the purpose of the embodiments of the present invention.
本发明的核心思想在于提供一种低成本的电流检测装置、电流检测系统及电流检测方法。The core idea of the present invention is to provide a low-cost current detecting device, a current detecting system, and a current detecting method.
为实现上述思想，本发明提供了一种电流检测装置、电流检测系统及电流检测方法，所述电流检测装置包括电流信号端口、第一传感装置和第二传感装置，其中：所述第一传感装置检测流过所述电流信号端口的电流并得到第一电流检测信号；所述第二传感装置检测流过第一传感装置的电流并得到第二电流检测信号。To achieve the above idea, the present invention provides a current detecting device, a current detecting system, and a current detecting method, the current detecting device including a current signal port, a first sensing device, and a second sensing device, wherein: A sensing device detects a current flowing through the current signal port and obtains a first current detecting signal; the second sensing device detects a current flowing through the first sensing device and obtains a second current detecting signal.
<实施例一><Example 1>
图1是本发明电流检测装置结构图，如图1所示，本实施例提供一种电流检测装置1，所述电流检测装置1用于电池管理系统，所述电流检测装置1包括电流信号端口、第一传感装置11和第二传感装置12，其中：所述第一传感装置11用于检测流过所述电流信号端口的电流并得到第一电流检测信号；所述第二传感装置12用于检测流过第一传感装置的电流并得到第二电流检测 信号。为了满足电池管理系统的安全等级ASIL C的要求以及高精度的要求，该技术方案共有两路电流采集。采用高精度分流电阻作为主信号采集的敏感元件，采用霍尔式传感器作为冗余信号采集的敏感元件，将两者集成为新的传感器方案。1 is a structural view of a current detecting device of the present invention. As shown in FIG. 1, the present embodiment provides a current detecting device 1 for a battery management system, the current detecting device 1 including a current signal port. The first sensing device 11 and the second sensing device 12, wherein: the first sensing device 11 is configured to detect a current flowing through the current signal port and obtain a first current detecting signal; Sensing device 12 is for detecting current flowing through the first sensing device and obtaining second current detecting signal. In order to meet the requirements of the battery management system's safety level ASIL C and high precision requirements, the technical solution has two current acquisitions. The high-precision shunt resistor is used as the sensitive component of the main signal acquisition, and the Hall sensor is used as the sensitive component of the redundant signal acquisition, and the two are integrated into a new sensor scheme.
具体的，在所述的电流检测装置中，所述第一传感装置11为分流电阻，所述第二传感装置12为霍尔电流传感器。所述霍尔电流传感器包括导磁环121和霍尔芯片122，所述导磁环121套在所述分流电阻，即第一传感装置11外侧并由流过第一传感装置的电流感应出一磁场强度，所述霍尔芯片122检测所述导磁环121内的磁场强度得到第二电流检测信号。也可采用磁通门传感器代替霍尔传感器，实现同样的功能，因此所述第二传感装置也可为磁通门传感器装置。所述磁通门传感器装置包括导磁环121和检测电路，所述导磁环121套在所述分流电阻外侧并由流过第一传感装置的电流感应出一磁场强度，所述检测电路检测所述导磁环内的磁场强度得到第二电流检测信号。所述电流检测装置还包括导磁环支架16，所述导磁环16支架用于将所述导磁环121固定在所述分流电阻，即第一传感装置11上。Specifically, in the current detecting device, the first sensing device 11 is a shunt resistor, and the second sensing device 12 is a Hall current sensor. The Hall current sensor includes a magnetic flux ring 121 and a Hall chip 122, and the magnetic flux ring 121 is sleeved on the shunt resistor, that is, outside the first sensing device 11 and is induced by current flowing through the first sensing device. A magnetic field strength is detected, and the Hall chip 122 detects the intensity of the magnetic field in the magnetically permeable ring 121 to obtain a second current detecting signal. A fluxgate sensor can also be used instead of the Hall sensor to achieve the same function, so the second sensing device can also be a fluxgate sensor device. The fluxgate sensor device includes a magnetic flux ring 121 and a detecting circuit, and the magnetic conductive ring 121 is sleeved outside the shunt resistor and induces a magnetic field strength by a current flowing through the first sensing device, the detecting circuit Detecting the strength of the magnetic field in the magnetically permeable ring to obtain a second current detection signal. The current detecting device further includes a magnetic flux ring holder 16 for fixing the magnetic conductive ring 121 to the shunt resistor, that is, the first sensing device 11.
具体的，高精度分流电阻穿过导磁环内径，通过导磁环支架定位连接，霍尔传感器检测流过高精度分流电阻的电流，而不是检测导线上的电流。高精度分流电阻用来精确检测主回路中的电流，经过温度补偿及标定后，精度可以达到0.5％，可以满足电池管理系统的精度要求，高精度分流电阻检测的电流值用于电流检测系统进行信号处理，而霍尔传感器检测的电流作为冗余信号用来校验高精度分流电阻电流采集的准确性。该方案中采样电路只需要采集一路高精度分流电阻电流信号就能满足安全等级的需求，即使用一路AD采样及隔离就能满足电压电流同步采集要求，简化了电路，减少了芯片的数量，降低成本。 Specifically, the high-precision shunt resistor passes through the inner diameter of the magnetically permeable ring and is positioned and connected by the magnetic flux ring bracket. The Hall sensor detects the current flowing through the high-precision shunt resistor instead of detecting the current on the wire. The high-precision shunt resistor is used to accurately detect the current in the main circuit. After temperature compensation and calibration, the accuracy can reach 0.5%, which can meet the accuracy requirements of the battery management system. The current value of the high-precision shunt resistor is used in the current detection system. Signal processing, and the current detected by the Hall sensor is used as a redundant signal to verify the accuracy of high-accuracy shunt resistor current acquisition. In this scheme, the sampling circuit only needs to collect one high-precision shunt resistor current signal to meet the safety level requirement, that is, the use of one-way AD sampling and isolation can meet the voltage and current synchronous acquisition requirements, simplifying the circuit, reducing the number of chips, and reducing cost.
进一步的，也可采用高精度采样的分流电阻采集的信号对霍尔电流传感器进行校验，提高霍尔电流传感器的精度，实现同样的功能，即所述第一传感装置为霍尔电流传感器或磁通门传感器装置，所述第二传感装置为分流电阻。Further, the Hall current sensor can be verified by using a signal collected by a high-precision sampling shunt resistor to improve the accuracy of the Hall current sensor, and the same function is achieved, that is, the first sensing device is a Hall current sensor. Or a fluxgate sensor device, the second sensing device being a shunt resistor.
在本实施例提供的电流检测装置中，通过所述第一传感装置用于检测流过所述电流信号端口的电流并得到第一电流检测信号，所述第二传感装置用于检测流过第一传感装置的电流并得到第二电流检测信号，使第二传感装置在第一传感装置的电流的基础上直接得到第二电流检测信号，不同于传统式非接触式传感器采用的检测导线上的电流，本发明使第二传感装置直接嵌套在第一传感装置上，采用第一传感装置和第二传感装置集成在同一结构中，使传感装置整体结构小，集成度高，坚固耐用，可靠性高，且电路连接清晰易懂。In the current detecting device provided in this embodiment, the first sensing device is configured to detect a current flowing through the current signal port and obtain a first current detecting signal, and the second sensing device is configured to detect a current Passing the current of the first sensing device and obtaining the second current detecting signal, so that the second sensing device directly obtains the second current detecting signal based on the current of the first sensing device, which is different from the traditional non-contact sensor. Detecting the current on the wire, the present invention allows the second sensing device to be directly nested on the first sensing device, and the first sensing device and the second sensing device are integrated in the same structure to make the overall structure of the sensing device Small, highly integrated, rugged, reliable, and easy to understand circuit connections.
如图1所示，电流检测装置1中还包括用于固定和封装的上壳体13、下壳体14和承载其他信号处理芯片和微处理器芯片的PCB板15。As shown in FIG. 1, the current detecting device 1 further includes an upper casing 13, a lower casing 14, and a PCB board 15 for carrying other signal processing chips and microprocessor chips for fixing and packaging.
综上，上述实施例对电流检测装置的不同构型进行了详细说明，当然，本发明包括但不局限于上述实施中所列举的构型，任何在上述实施例提供的构型基础上进行变换的内容，均属于本发明所保护的范围。本领域技术人员可以根据上述实施例的内容举一反三。In summary, the above embodiments describe the different configurations of the current detecting device in detail. Of course, the present invention includes, but is not limited to, the configurations listed in the above embodiments, and any changes are made based on the configuration provided by the above embodiments. The contents are all within the scope of protection of the present invention. Those skilled in the art can make the same according to the content of the above embodiments.
<实施例二><Embodiment 2>
图2是本发明电流检测系统架构图，如图2所示，本实施例还提供一种电流检测系统，所述电流检测系统包括电流检测装置1、控制器2和信号处理器3，其中：所述电流检测装置1连接所述信号处理器3，将所述第一电流检测信号发送给信号处理器3，所述信号处理器对所述第一电流检测信号进行处理；所述电流检测装置1连接所述控制器2，将所述第二电流检测信号发送给 控制器2，所述控制器接收所述第二电流检测信号；所述信号处理器3连接所述控制器2，将所述第一电流检测信号发送给控制器，所述控制器接收所述第一电流检测信号，并将所述第一电流检测信号和所述第二电流检测信号进行比较得到最终检测信号。2 is a structural diagram of the current detecting system of the present invention. As shown in FIG. 2, the embodiment further provides a current detecting system including a current detecting device 1, a controller 2 and a signal processor 3, wherein: The current detecting device 1 is connected to the signal processor 3, and sends the first current detecting signal to the signal processor 3, and the signal processor processes the first current detecting signal; the current detecting device 1 connecting the controller 2, sending the second current detection signal to a controller 2, the controller receives the second current detection signal; the signal processor 3 is connected to the controller 2, and sends the first current detection signal to a controller, the controller receives the The first current detection signal compares the first current detection signal and the second current detection signal to obtain a final detection signal.
进一步的，在所述的电流检测系统中，所述电流检测装置1包括电流信号端口、第一传感装置11和第二传感装置12，其中：所述第一传感装置11用于检测流过所述电流信号端口的电流并得到第一电流检测信号；所述第二传感装置12用于检测流过第一传感装置的电流并得到第二电流检测信号。所述第二传感装置12为霍尔电流传感器。所述霍尔电流传感器包括导磁环121和霍尔芯片122，所述导磁环121套在所述分流电阻，即第一传感装置11外侧并由第一电流检测信号感应出一磁场强度，所述霍尔芯片122检测所述导磁环121内的磁场强度得到第二电流检测信号。Further, in the current detecting system, the current detecting device 1 includes a current signal port, a first sensing device 11 and a second sensing device 12, wherein: the first sensing device 11 is configured to detect A current flowing through the current signal port and a first current detection signal is obtained; the second sensing device 12 is configured to detect a current flowing through the first sensing device and obtain a second current detection signal. The second sensing device 12 is a Hall current sensor. The Hall current sensor includes a magnetic flux ring 121 and a Hall chip 122. The magnetic flux ring 121 is sleeved on the shunt resistor, that is, outside the first sensing device 11 and induces a magnetic field strength by the first current detecting signal. The Hall chip 122 detects the intensity of the magnetic field in the magnetically permeable ring 121 to obtain a second current detection signal.
更进一步的，在所述的电流检测系统中，所述第二传感装置12将所述第二电流检测信号发送给所述控制器2，所述第一传感装置11将所述第一电流检测信号发送给所述信号处理器3，所述信号处理器3将所述第一电流检测信号进行处理后，发送给所述控制器2，所述控制器2将所述第一电流检测信号和所述第二电流检测信号进行处理得到最终检测信号。Further, in the current detecting system, the second sensing device 12 transmits the second current detecting signal to the controller 2, and the first sensing device 11 will be the first The current detection signal is sent to the signal processor 3, and the signal processor 3 processes the first current detection signal and sends it to the controller 2, and the controller 2 detects the first current The signal and the second current detection signal are processed to obtain a final detection signal.
另外，在所述的电流检测系统中，所述信号处理器3包括AD转换芯片31和隔离芯片32。所述电流检测系统还包括分压电阻4和热敏电阻装置5，所述分压电阻4连接所述信号处理器3，所述分压电阻4用于检测电压信号并将所述电压信号发送给所述信号处理器3；在本实施例提供的电流检测系统中，通过所述分压电阻检测所述电压信号并将电压信号发送给所述信号处理器，实现电流电压同步采样，且无需增加额外的AD转换电路和隔离电路，系统简单，成本低。所述热敏电阻装置5用于对所述第一电流检测信号和所 述第二电流检测信号进行温度补偿，提供电流检测信号的精度和准确度。本实施例中的电流检测系统还包括通信模块6、线性稳压芯片7和参考电压芯片8，用于系统中的各种其他功能。Further, in the current detecting system, the signal processor 3 includes an AD conversion chip 31 and an isolation chip 32. The current detecting system further includes a voltage dividing resistor 4 and a thermistor device 5, the voltage dividing resistor 4 is connected to the signal processor 3, and the voltage dividing resistor 4 is configured to detect a voltage signal and send the voltage signal To the signal processor 3; in the current detecting system provided in this embodiment, the voltage signal is detected by the voltage dividing resistor and the voltage signal is sent to the signal processor, so that current and voltage synchronous sampling is realized, and Adding additional AD conversion circuits and isolation circuits makes the system simple and low cost. The thermistor device 5 is configured to detect the first current and the current The second current detection signal is temperature compensated to provide accuracy and accuracy of the current detection signal. The current detecting system in this embodiment further includes a communication module 6, a linear regulator chip 7, and a reference voltage chip 8 for various other functions in the system.
在本实施例提供的电流检测系统中，通过电流检测装置1发送的第一电流检测信号和第二电流检测信号，满足了电池管理系统的电流检测装置的安全等级要求，通过所述控制器2直接接收所述第二电流检测信号，无需冗余的AD转换电路等信号处理器。In the current detecting system provided by the embodiment, the first current detecting signal and the second current detecting signal sent by the current detecting device 1 satisfy the safety level requirement of the current detecting device of the battery management system, and the controller 2 is passed through the controller 2 The second current detection signal is directly received, and a signal processor such as a redundant AD conversion circuit is not required.
具体的，本发明采用高精度分流电阻作为主电流采集传感器，采样精度能达到0.5％，采用霍尔传感器作为冗余电流采样部分，霍尔传感器可直接连接到控制器上，减少了AD转换电路等信号处理，降低了双AD采样高精度分流电阻电流方案的成本，简化了电路部分，同时霍尔传感器电流采样可以对高精度分流电阻电流采样进行校验，可以满足电池管理系统安全等级ASIL C的需求。Specifically, the invention adopts a high-precision shunt resistor as the main current collecting sensor, and the sampling precision can reach 0.5%, and the Hall sensor is used as the redundant current sampling part, and the Hall sensor can be directly connected to the controller, thereby reducing the AD conversion circuit. Equal signal processing reduces the cost of the dual AD sampling high-precision shunt resistor current scheme and simplifies the circuit. At the same time, the Hall sensor current sampling can verify the high-precision shunt resistor current sampling, which can meet the battery management system safety level ASIL C. Demand.
进一步的，在本发明提供的电流检测装置、电流检测系统及电流检测方法中，通过所述分压电阻4检测所述电压信号并将电压信号发送给所述信号处理器3，实现电流电压同步采样，且无需增加额外的AD转换电路和隔离电路，系统简单，成本低。Further, in the current detecting device, the current detecting system, and the current detecting method provided by the present invention, the voltage signal is detected by the voltage dividing resistor 4 and the voltage signal is sent to the signal processor 3 to realize current-voltage synchronization. Sampling, without the need to add additional AD conversion circuits and isolation circuits, the system is simple and low cost.
<实施例三><Example 3>
本实施例提供一种电流检测系统的电流检测方法，所述电流检测方法包括：所述第一传感装置检测流过所述电流信号端口的电流并得到第一电流检测信号，第一传感装置将所述第一电流检测信号发送给信号处理器；信号处理器对所述第一电流检测信号进行信号处理并发送给控制器；所述第二传感装置检测流过所述第一传感装置的电流并得到第二电流检测信号，第二传感装置将所述第二电流检测信号发送给控制器，所述控制器接收到第一电流检 测信号和第二电流检测信号后，对第一电流检测信号和第二电流检测信号进行比较，若第一电流检测信号和第二电流检测信号的差值在阈值范围内，则将第一电流检测信号作为最终检测信号。The embodiment provides a current detecting method for a current detecting system. The current detecting method includes: the first sensing device detects a current flowing through the current signal port and obtains a first current detecting signal, and the first sensing The device transmits the first current detection signal to a signal processor; the signal processor performs signal processing on the first current detection signal and transmits to the controller; and the second sensing device detects flowing through the first transmission Sensing the current of the device and obtaining a second current detecting signal, the second sensing device transmitting the second current detecting signal to the controller, the controller receiving the first current detecting After measuring the signal and the second current detection signal, comparing the first current detection signal and the second current detection signal, if the difference between the first current detection signal and the second current detection signal is within a threshold range, the first current is The detection signal is used as the final detection signal.
具体的，所述电流检测系统的电流检测方法还可包括：若第一电流检测信号和第二电流检测信号的差值超过阈值范围，则控制器重新接收第一电流检测信号和第二电流检测信号。Specifically, the current detecting method of the current detecting system may further include: if the difference between the first current detecting signal and the second current detecting signal exceeds a threshold range, the controller re-receives the first current detecting signal and the second current detecting signal.
在本实施例提供的电流检测系统的电流检测方法中，通过所述第一传感装置用于检测流过所述电流信号端口的电流并得到第一电流检测信号，所述第二传感装置用于检测流过第一传感装置的电流并得到第二电流检测信号，满足了电池管理系统的电流检测装置的安全等级要求，通过采用高精度分流电阻作为主电流采集传感器，采样精度能达到0.5％，采用霍尔传感器作为冗余电流采样部分，霍尔传感器可直接连接到控制器上，减少了AD转换电路等信号处理，降低了双AD采样高精度分流电阻电流方案的成本，简化了电路部分，同时霍尔传感器电流采样可以对高精度分流电阻电流采样进行校验，可以满足电池管理系统安全等级ASIL C的需求。In the current detecting method of the current detecting system provided in this embodiment, the first sensing device is configured to detect a current flowing through the current signal port and obtain a first current detecting signal, and the second sensing device It is used for detecting the current flowing through the first sensing device and obtaining the second current detecting signal, which satisfies the safety level requirement of the current detecting device of the battery management system, and adopts a high-precision shunt resistor as the main current collecting sensor, and the sampling precision can be achieved. 0.5%, using Hall sensor as redundant current sampling part, Hall sensor can be directly connected to the controller, reducing signal processing such as AD conversion circuit, reducing the cost of dual AD sampling high-precision shunt resistor current scheme, simplifying The circuit part, while the Hall sensor current sampling can verify the high-precision shunt resistor current sampling, can meet the needs of the battery management system safety level ASIL C.
本说明书中各个实施例采用递进的方式描述，每个实施例重点说明的都是与其他实施例的不同之处，各个实施例之间相同相似部分互相参见即可。对于实施例公开的系统而言，由于与实施例公开的方法相对应，所以描述的比较简单，相关之处参见方法部分说明即可。The various embodiments in the present specification are described in a progressive manner, and each embodiment focuses on differences from other embodiments, and the same similar parts between the various embodiments may be referred to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant part can be referred to the method part.
上述描述仅是对本发明较佳实施例的描述，并非对本发明范围的任何限定，本发明领域的普通技术人员根据上述揭示内容做的任何变更、修饰，均属于权利要求书的保护范围。 The above description is only for the description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes and modifications made by those skilled in the art in light of the above disclosure are all within the scope of the appended claims.

Claims (16)

  1. 一种电流检测装置，所述电流检测装置用于电池管理系统，其特征在于，所述电流检测装置包括电流信号端口、第一传感装置和第二传感装置，其中：A current detecting device for a battery management system, characterized in that the current detecting device comprises a current signal port, a first sensing device and a second sensing device, wherein:
    所述第一传感装置用于检测流过所述电流信号端口的电流并得到第一电流检测信号；The first sensing device is configured to detect a current flowing through the current signal port and obtain a first current detection signal;
    所述第二传感装置用于检测流过第一传感装置的电流并得到第二电流检测信号。The second sensing device is configured to detect a current flowing through the first sensing device and obtain a second current detecting signal.
  2. 如权利要求1所述的电流检测装置，其特征在于，所述第一传感装置为分流电阻，所述第二传感装置为霍尔电流传感器。A current detecting device according to claim 1, wherein said first sensing means is a shunt resistor and said second sensing means is a Hall current sensor.
  3. 如权利要求2所述的电流检测装置，其特征在于，所述霍尔电流传感器包括导磁环和霍尔芯片，所述导磁环套在所述分流电阻外侧并由流过分流电阻的电流感应出一磁场强度，所述霍尔芯片检测所述导磁环内的磁场强度得到第二电流检测信号。A current detecting device according to claim 2, wherein said Hall current sensor comprises a magnetic flux ring and a Hall chip, said magnetic flux ring being sleeved outside said shunt resistor and flowing by a current flowing through said shunt resistor A magnetic field strength is induced, and the Hall chip detects the magnetic field strength in the magnetically permeable ring to obtain a second current detecting signal.
  4. 如权利要求1所述的电流检测装置，其特征在于，所述第一传感装置为分流电阻，所述第二传感装置为磁通门传感器装置。A current detecting device according to claim 1, wherein said first sensing means is a shunt resistor and said second sensing means is a fluxgate sensor means.
  5. 如权利要求4所述的电流检测装置，其特征在于，所述磁通门传感器装置包括导磁环和检测电路，所述导磁环套在所述分流电阻外侧并由流过分流电阻的电流感应出一磁场强度，所述检测电路检测所述导磁环内的磁场强度得到第二电流检测信号。A current detecting device according to claim 4, wherein said fluxgate sensor means comprises a magnetic flux ring and a detecting circuit, said magnetic conducting ring being sleeved outside said shunt resistor and flowing by a current flowing through said shunt resistor A magnetic field strength is induced, and the detecting circuit detects the magnetic field strength in the magnetic conductive ring to obtain a second current detecting signal.
  6. 如权利要求3或5所述的电流检测装置，其特征在于，所述电流检测装置还包括导磁环支架，所述导磁环支架用于将所述导磁环固定在所述分流电阻上。 A current detecting device according to claim 3 or 5, wherein said current detecting means further comprises a magnetic flux ring holder for fixing said magnetic flux ring to said shunt resistor .
  7. 如权利要求1所述的电流检测装置，其特征在于，所述第一传感装置为霍尔电流传感器，所述第二传感装置为分流电阻。A current detecting device according to claim 1, wherein said first sensing means is a Hall current sensor and said second sensing means is a shunt resistor.
  8. 如权利要求1所述的电流检测装置，其特征在于，所述第一传感装置为磁通门传感器装置，所述第二传感装置为分流电阻。The current detecting device according to claim 1, wherein said first sensing device is a fluxgate sensor device, and said second sensing device is a shunt resistor.
  9. 一种电流检测系统，其特征在于，所述电流检测系统包括电流检测装置、控制器和信号处理器，其中：A current detecting system, characterized in that the current detecting system comprises a current detecting device, a controller and a signal processor, wherein:
    所述电流检测装置连接所述信号处理器，将第一电流检测信号发送给信号处理器，所述信号处理器对所述第一电流检测信号进行处理；The current detecting device is connected to the signal processor, and sends a first current detecting signal to a signal processor, wherein the signal processor processes the first current detecting signal;
    所述电流检测装置连接所述控制器，将第二电流检测信号发送给控制器，所述控制器接收所述第二电流检测信号；The current detecting device is connected to the controller, and sends a second current detecting signal to the controller, and the controller receives the second current detecting signal;
    所述信号处理器连接所述控制器，将所述第一电流检测信号发送给控制器，所述控制器接收所述第一电流检测信号，并将所述第一电流检测信号和所述第二电流检测信号进行比较得到最终检测信号。The signal processor is connected to the controller, and sends the first current detection signal to a controller, the controller receives the first current detection signal, and the first current detection signal and the first The two current detection signals are compared to obtain a final detection signal.
  10. 如权利要求9所述的电流检测系统，其特征在于，所述电流检测装置包括电流信号端口、第一传感装置和第二传感装置，其中：A current detecting system according to claim 9, wherein said current detecting means comprises a current signal port, a first sensing means and a second sensing means, wherein:
    所述第一传感装置用于检测流过所述电流信号端口的电流并得到所述第一电流检测信号；The first sensing device is configured to detect a current flowing through the current signal port and obtain the first current detection signal;
    所述第二传感装置用于检测流过所述第一传感装置的电流并得到所述第二电流检测信号。The second sensing device is configured to detect a current flowing through the first sensing device and obtain the second current detecting signal.
  11. 如权利要求10所述的电流检测系统，其特征在于，所述第二传感装置将所述第二电流检测信号发送给所述控制器，所述第一传感装置将所述第一电流检测信号发送给所述信号处理器，所述信号处理器将所述第一电流检测信号进行处理后，发送给所述控制器，所述控制器将所述第一电流检测信号和所述第二电流检测信号进行处理得到最终检测信号。 A current detecting system according to claim 10, wherein said second sensing means transmits said second current detecting signal to said controller, said first sensing means said said first current Sending a detection signal to the signal processor, the signal processor processing the first current detection signal, and transmitting the signal to the controller, the controller to the first current detection signal and the first The two current detection signals are processed to obtain a final detection signal.
  12. 如权利要求11所述的电流检测系统，其特征在于，所述信号处理器包括AD转换芯片和隔离芯片。The current detecting system of claim 11 wherein said signal processor comprises an AD conversion chip and an isolation chip.
  13. 如权利要求11所述的电流检测系统，其特征在于，所述电流检测系统还包括分压电阻，所述分压电阻连接所述信号处理器，所述分压电阻用于检测电压信号并将所述电压信号发送给所述信号处理器。A current detecting system according to claim 11, wherein said current detecting system further comprises a voltage dividing resistor connected to said signal processor, said voltage dividing resistor is for detecting a voltage signal and The voltage signal is sent to the signal processor.
  14. 如权利要求11所述的电流检测系统，其特征在于，所述电流检测系统还包括热敏电阻装置，所述热敏电阻装置用于对所述第一电流检测信号和所述第二电流检测信号进行温度补偿。A current detecting system according to claim 11, wherein said current detecting system further comprises a thermistor device for detecting said first current detecting signal and said second current The signal is temperature compensated.
  15. 一种电流检测方法，其特征在于，包括：A current detecting method, comprising:
    第一传感装置检测流过电流信号端口的电流以得到第一电流检测信号，并将所述第一电流检测信号发送给信号处理器；The first sensing device detects a current flowing through the current signal port to obtain a first current detecting signal, and transmits the first current detecting signal to the signal processor;
    信号处理器将所述第一电流检测信号进行信号处理并发送给控制器；The signal processor signals the first current detection signal and sends it to the controller;
    第二传感装置检测流过所述第一传感装置的电流以得到第二电流检测信号，并将所述第二电流检测信号发送给控制器；The second sensing device detects a current flowing through the first sensing device to obtain a second current detecting signal, and transmits the second current detecting signal to the controller;
    所述控制器接收到第一电流检测信号和第二电流检测信号后，对第一电流检测信号和第二电流检测信号进行比较，若第一电流检测信号和第二电流检测信号的差值在阈值范围内，则将第一电流检测信号作为最终检测信号。After receiving the first current detection signal and the second current detection signal, the controller compares the first current detection signal and the second current detection signal, if the difference between the first current detection signal and the second current detection signal is Within the threshold range, the first current detection signal is used as the final detection signal.
  16. 如权利要求15所述的电流检测方法，其特征在于，还包括：The current detecting method according to claim 15, further comprising:
    若第一电流检测信号和第二电流检测信号的差值超过阈值范围，则控制器重新接收第一电流检测信号和第二电流检测信号。 If the difference between the first current detection signal and the second current detection signal exceeds a threshold range, the controller re-receives the first current detection signal and the second current detection signal.
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