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WO2018107987A1 - Dispositif de détection de courant, système de détection de courant et procédé de détection de courant - Google Patents

Dispositif de détection de courant, système de détection de courant et procédé de détection de courant 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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WO
WIPO (PCT)
Prior art keywords
current
signal
current detecting
detection signal
sensing device
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PCT/CN2017/114372
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English (en)
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/fr

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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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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

La présente invention concerne un dispositif de détection de courant (1), un système de détection de courant et un procédé de détection de courant, le dispositif de détection de courant (1) comprenant un port de signal de courant, un premier dispositif de détection (11) et un second dispositif de détection (12), le premier dispositif de détection (11) détectant un courant qui passe à travers l'orifice de signal de courant et obtenant un premier signal de détection de courant ; le second dispositif de détection (12) détectant un courant qui passe à travers le premier dispositif de détection (11) et obtenant un second signal de détection de courant, le premier dispositif de détection (11) étant une résistance de dérivation, et le second dispositif de détection (12) étant un capteur de courant à effet Hall ou un dispositif de détection de grille de flux ; et un dispositif de commande (2) dans le système de détection de courant traite le premier signal de détection de courant et le second signal de détection de courant pour obtenir un signal de détection final.
PCT/CN2017/114372 2016-12-16 2017-12-04 Dispositif de détection de courant, système de détection de courant et procédé de détection de courant WO2018107987A1 (fr)

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CN201611169095.5A CN108205077A (zh) 2016-12-16 2016-12-16 电流检测装置、电流检测系统及电流检测方法

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CN110238087A (zh) * 2019-06-05 2019-09-17 山东华宇工学院 一种电阻检测分选装置及检测分选方法
EP3623822A1 (fr) * 2018-09-17 2020-03-18 Contemporary Amperex Technology Co., Limited Ensemble redondant d'échantillonnage de courant
CN118243991A (zh) * 2024-05-30 2024-06-25 武汉嘉晨电子技术股份有限公司 一种电流检测装置、系统及方法
EP4296695A4 (fr) * 2021-02-17 2024-12-25 Smart Electronics Inc. Dispositif de détection de courant

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CN109633255A (zh) * 2019-01-25 2019-04-16 常州索维尔电子科技有限公司 基于分流器的电流测量装置及电流测量方法

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EP3623822A1 (fr) * 2018-09-17 2020-03-18 Contemporary Amperex Technology Co., Limited Ensemble redondant d'échantillonnage de courant
CN110238087A (zh) * 2019-06-05 2019-09-17 山东华宇工学院 一种电阻检测分选装置及检测分选方法
EP4296695A4 (fr) * 2021-02-17 2024-12-25 Smart Electronics Inc. Dispositif de détection de courant
CN118243991A (zh) * 2024-05-30 2024-06-25 武汉嘉晨电子技术股份有限公司 一种电流检测装置、系统及方法

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