CN210721839U - MBUS communication circuit and MBUS communication system - Google Patents
MBUS communication circuit and MBUS communication system Download PDFInfo
- Publication number
- CN210721839U CN210721839U CN201922442533.6U CN201922442533U CN210721839U CN 210721839 U CN210721839 U CN 210721839U CN 201922442533 U CN201922442533 U CN 201922442533U CN 210721839 U CN210721839 U CN 210721839U
- Authority
- CN
- China
- Prior art keywords
- resistor
- triode
- circuit
- mbus
- conversion circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000004891 communication Methods 0.000 title claims abstract description 59
- 238000002955 isolation Methods 0.000 claims abstract description 40
- 238000006243 chemical reaction Methods 0.000 claims description 91
- 239000003990 capacitor Substances 0.000 claims description 32
- 230000005693 optoelectronics Effects 0.000 claims 1
- 230000002265 prevention Effects 0.000 abstract description 9
- 238000000034 method Methods 0.000 description 20
- 230000003287 optical effect Effects 0.000 description 17
- 230000008569 process Effects 0.000 description 6
- 230000008054 signal transmission Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
Images
Landscapes
- Optical Communication System (AREA)
Abstract
The embodiment of the utility model provides a MBUS communication circuit and MBUS communication system relates to the power equipment field, and wherein, this MBUS communication circuit includes: the system comprises a first photoelectric isolation circuit, a second photoelectric isolation circuit and an MBUS interface circuit, wherein the first photoelectric isolation circuit is configured to transmit data from a signal transmitting end of an electric meter MCU to a copying controller through the MBUS interface circuit, and the MBUS interface circuit is configured to transmit an instruction of the copying controller to a signal receiving end of the electric meter MCU through the second photoelectric isolation circuit. Therefore, the embodiment of the utility model provides a technical scheme keeps apart through photoelectric signal to design interface circuit, improved the outside forceful electric power attack ability of preventing of ammeter, alleviated and had the problem that outside forceful electric power attack prevention performance is relatively poor among the prior art.
Description
Technical Field
The utility model relates to a power equipment technical field particularly, relates to a MBUS communication circuit and MBUS communication system.
Background
During the working process of the electric meter, the electric meter is frequently damaged due to human or natural disasters, and great inconvenience is caused to power operators and users, so that the external strong electricity prevention capability is an important standard for evaluating the reliability of the electric meter.
The ammeter installation environment in current overseas market is complicated, and the ammeter in some areas needs to face the attack of tens of kilovolts of outside forceful electric power, has the potential safety hazard, and especially the artificial electric baton of using maliciously attacks the ammeter, as the external port of ammeter, the MBUS circuit needs to focus on preventing the attack of outside forceful electric power.
At present, the external strong electric attack prevention method of the MBUS circuit adopted in the prior art mainly comprises the following two methods, one method is to increase a metal piece with arc discharge absorption capacity to realize external isolation; the other method is to increase the volume of the electric meter and increase the space distance from an external strong electric attack source to the MBUS circuit; the above two methods have poor performance for preventing external strong current attack of tens KV level.
In summary, the prior art has a problem of poor performance of preventing external strong electric attacks.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides an MBUS communication circuit and an MBUS communication system to alleviate the problem of poor prevention of external strong electric attack in the prior art.
In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions:
in a first aspect, an embodiment of the present invention provides an MBUS communication circuit, including: the system comprises a first photoelectric isolation circuit, a second photoelectric isolation circuit and an MBUS interface circuit, wherein the first photoelectric isolation circuit is configured to transmit data from a signal transmitting end of an electric meter MCU to a copying controller through the MBUS interface circuit, and the MBUS interface circuit is configured to transmit an instruction of the copying controller to a signal receiving end of the electric meter MCU through the second photoelectric isolation circuit.
In combination with the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, wherein the first photoelectric isolation circuit includes a first photoelectric conversion circuit and a first photoelectric conversion circuit, and the first photoelectric conversion circuit is electrically isolated from the first photoelectric conversion circuit;
the second photoelectric isolation circuit comprises a second photoelectric conversion circuit and a second photoelectric conversion circuit, and the second photoelectric conversion circuit is electrically isolated from the second photoelectric conversion circuit.
With reference to the first possible implementation manner of the first aspect, the present invention provides a second possible implementation manner of the first aspect, wherein the first electro-optical conversion circuit includes a triode V1, a resistor R3, a resistor R6, and a light emitting tube HL 1; one end of the resistor R3 is connected with a signal output end of the electric meter MCU; the other end of the resistor R3 is connected with the base electrode of the triode V1, the emitting electrode of the triode is connected with a first power supply Vcc, the collector electrode of the triode V1 is connected with one end of the resistor R6, the other end of the resistor R6 is connected with the positive electrode end of the luminotron HL1, and the negative electrode end of the luminotron HL1 is grounded;
the first photoelectric conversion circuit comprises a light receiving tube BL1, a resistor 1, a resistor R1, a resistor R2, a resistor R4, a resistor R5, a resistor R7, a triode V2, a triode V3 and a triode V4; the negative end of the light receiving tube BL1 is connected with a second power supply Vdd, the positive end of the light receiving tube BL1 is connected with one end of a resistor 1, the other end of the resistor 1 is connected with the base electrode of the triode V4, one end of a resistor R1 is connected with the second power supply Vdd, and the other end of the resistor R1 is connected with the base electrode of the triode V2 and the emitting electrode of the triode V3; one end of the resistor R2 is connected with a second power supply Vdd, the other end of the resistor R2 is connected with an emitter of the triode V2, one end of the resistor R7 is connected with a base electrode of the triode V4, and the other end of the resistor R7 is grounded; the emitter of the triode V4 is grounded; one end of the resistor R5 is connected with the collector of the triode V4, the other end of the resistor R5 is connected with the collector of the triode V2 and the base of the triode V3, one end of the resistor R4 is connected with the base of the triode V2 and the emitter of the triode V3, the other end of the resistor R4 is connected with the collector of the triode V2 and the base of the triode V3, and the collector of the triode V3 is connected with the input end of the MBUS interface circuit.
With reference to the second possible implementation manner of the first aspect, the present invention provides a third possible implementation manner of the first aspect, wherein the first electrical-to-optical conversion circuit further includes a capacitor C1, and the capacitor C1 is connected in parallel to two ends of the resistor R3;
the first photoelectric conversion circuit further comprises a capacitor C2 and a capacitor C3, wherein the capacitor C2 is connected in parallel to two ends of the resistor R5, and the capacitor C3 is connected in parallel to two ends of the resistor 1.
With reference to the first possible implementation manner of the first aspect, the present invention provides a fourth possible implementation manner of the first aspect, wherein the second electrical-to-optical conversion circuit includes a light-emitting tube HL2, a diode VD4, a diode VD5, a transistor V5, a MOS tube M1, a resistor R9, a resistor R10, a resistor R11, and a resistor R13; one end of a resistor R11 is connected with the output end of the MBUS interface circuit, the other end of the resistor R11 is connected with the cathode end of a diode VD5, the anode end of the diode VD5 is connected with the grid electrode of the MOS tube M1, one end of a resistor R9 is connected with the grid electrode of the MOS tube M1, the other end of a resistor R9 is connected with the source electrode of the MOS tube M1, the cathode end of the diode VD4 is connected with the source electrode of the MOS tube M1, the anode end of the diode VD4 is connected with a second power supply Vdd, one end of the resistor R10 is connected with the second power supply Vdd, the other end of the resistor R10 is connected with the collector electrode of a triode V5, the anode end of the HL luminotron 2 is connected with the emitter electrode of the triode V5, the anode end of the HL2 is grounded, one end of the resistor R13 is connected with;
the second photoelectric conversion circuit comprises a triode V6, a resistor R12, a resistor R14, a resistor R15, a resistor R17 and a light receiving tube BL 2; one end of the resistor R15 is connected with a signal receiving end of the electric meter MCU; the other end of the resistor R15 is connected with the collector of the triode V6, one end of the resistor R12 is connected with the first power supply Vcc, the other end of the resistor R12 is connected with the collector of the triode V6, and the emitter of the triode V6 is grounded; the negative end of the light receiving tube BL2 is connected with a first power supply Vcc, one end of a resistor R14 is connected with the positive end of the light receiving tube BL2, the other end of the resistor R14 is connected with the base of a triode V6, one end of a resistor R17 is connected with the base of a triode V6, and the other end of the resistor R17 is grounded.
With reference to the fourth possible implementation manner of the first aspect, the present invention provides a fifth possible implementation manner of the first aspect, wherein the second photoelectric conversion circuit further includes a capacitor C4, and the capacitor C4 is connected in parallel to two ends of the resistor R3; the second electro-optical conversion circuit further comprises a capacitor C5, and the capacitor C5 is connected in parallel to two ends of the resistor R13.
With reference to the first aspect, embodiments of the present invention provide a sixth possible implementation manner of the first aspect, where the MBUS interface circuit includes a diode VD2, a diode VD3, a resistor R8, and a resistor R16, and a positive terminal of the diode VD2 is an input terminal of the MBUS interface circuit; the cathode end of the diode VD3 is the output end of the MBUS interface circuit; the negative end of the diode VD2 is connected with one end of the resistor R8, the positive end of the diode VD3 is connected with the negative end of the diode VD2, and one end of the resistor R8 is connected with the copy controller; the other end of the resistor R8 is grounded; one end of the resistor R16 is connected to the negative terminal of the diode VD3, and the other end of the resistor R16 is grounded.
In combination with the second possible implementation manner of the first aspect, the embodiment of the present invention provides a seventh possible implementation manner of the first aspect, wherein the light emitting tube HL1 adopts an infrared light emitting tube, the light receiving tube BL1 adopts an infrared receiving tube, and a working distance between the light emitting tube HL1 and the light receiving tube BL1 is greater than 90 mm.
In combination with the fourth possible implementation manner of the first aspect, the embodiment of the present invention provides an eighth possible implementation manner of the first aspect, wherein the light emitting tube HL2 adopts an infrared light emitting tube, the light receiving tube BL2 adopts an infrared receiving tube, and a working distance between the light emitting tube HL2 and the light receiving tube BL2 is greater than 90 mm.
In a second aspect, the embodiment of the present invention provides a strong current prevention system, including the electric meter MCU, copy the accuse ware and as any one of the foregoing embodiments the MBUS communication circuit, the electric meter MCU passes through the MBUS communication circuit with copy accuse ware communication connection.
The embodiment of the utility model provides a following beneficial effect has been brought: the embodiment of the utility model provides a MBUS communication circuit and MBUS communication system, wherein, this MBUS communication circuit includes: the system comprises a first photoelectric isolation circuit, a second photoelectric isolation circuit and an MBUS interface circuit, wherein the first photoelectric isolation circuit is configured to transmit data from a signal transmitting end of an electric meter MCU to a copying controller through the MBUS interface circuit, and the MBUS interface circuit is configured to transmit an instruction of the copying controller to a signal receiving end of the electric meter MCU through the second photoelectric isolation circuit. Therefore, the embodiment of the utility model provides a technical scheme keeps apart through photoelectric signal to design interface circuit, improved the outside forceful electric power attack ability of preventing of ammeter, alleviated and had the problem that outside forceful electric power attack prevention performance is relatively poor among the prior art. In addition, compare in prior art, this MBUS communication circuit adopts discrete components to build, can accomplish tens of KV rank outside forceful electric power attack and prevent under the condition that does not increase the ammeter cost, is favorable to reducing the isolation cost, and simultaneously, discrete components's that this MBUS communication circuit adopted are small, and the overall arrangement is nimble, and the commonality is high.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 shows a first schematic structural diagram of an MBUS communication circuit provided by an embodiment of the present invention;
fig. 2 shows a second schematic structural diagram of an MBUS communication circuit provided by an embodiment of the present invention;
fig. 3 shows a specific circuit diagram of an MBUS communication circuit provided by an embodiment of the present invention;
fig. 4 shows a schematic diagram of an MBUS communication system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
At present, the external strong electric attack prevention method of the MBUS circuit adopted in the prior art mainly comprises the following two methods, one method is to increase a metal piece with arc discharge absorption capacity to realize external isolation; the other method is to increase the volume of the electric meter and increase the space distance from an external strong electric attack source to the MBUS circuit; the above two methods have poor performance for preventing external strong current attack of tens KV level. In addition, both of the above methods increase the isolation cost.
In view of this, the embodiment of the present invention provides an MBUS communication circuit and an MBUS communication system to alleviate the problem that the prior art has poor prevention performance of external strong electric attack. In addition, compare in prior art, this MBUS communication circuit adopts discrete components to build, can accomplish the outside forceful electric power attack of tens KV rank and take precautions against under the condition that does not increase the ammeter cost, is favorable to reducing the isolation cost of ammeter, and simultaneously, discrete components that this MBUS communication circuit adopted are small, and the overall arrangement is nimble, and the commonality is high.
Example one
As shown in fig. 1, the embodiment of the utility model provides a MBUS communication circuit is applied to the ammeter, include: the device comprises a first photoelectric isolation circuit 10, a second photoelectric isolation circuit 20 and an MBUS interface circuit 30, wherein the first photoelectric isolation circuit and the second photoelectric isolation circuit are connected with the MBUS interface circuit; the first photoelectric isolation circuit is configured to send data from a signal transmitting end of an electric meter MCU to a copying controller through the MBUS interface circuit, and the MBUS interface circuit is configured to transmit an instruction of the copying controller to a signal receiving end of the electric meter MCU through the second photoelectric isolation circuit.
In this embodiment, a signal sent by the electric meter MCU is transmitted to the copy controller through the first photoelectric isolation circuit and the MBUS interface circuit in sequence; and an external instruction sent by the copy controller is transmitted to the electric meter MCU through the MBUS interface circuit and the second photoelectric isolation circuit in sequence.
In an alternative embodiment, as shown in fig. 2, the first photoelectric isolation circuit includes a first photoelectric conversion circuit 11 and a first photoelectric conversion circuit 12, and the first photoelectric conversion circuit 21 is electrically isolated from the first photoelectric conversion circuit 22;
the first electro-optical conversion circuit is in communication connection with the first photoelectric conversion circuit through an isolated optical signal; the first electro-optical conversion circuit is configured to convert an electric signal from an electric meter MCU into an optical signal and transmit the optical signal to the first electro-optical conversion circuit; the first photoelectric conversion circuit is configured to convert the optical signal converted by the first photoelectric conversion circuit into an electrical signal and transmit the electrical signal to the MBUS interface circuit;
the second photoelectric isolation circuit comprises a second photoelectric conversion circuit and a second photoelectric conversion circuit, and the second photoelectric conversion circuit is electrically isolated from the second photoelectric conversion circuit.
Wherein the second electrical-to-optical conversion circuit is in communication with the second optical-to-electrical conversion circuit via an isolated optical signal; the second electro-optical conversion circuit is configured to convert the electrical signal from the MBUS interface circuit into an optical signal and transmit the optical signal to the second electro-optical conversion circuit; the second photoelectric conversion circuit is configured to convert the optical signal converted by the second photoelectric conversion circuit into an electrical signal and transmit the electrical signal to a signal receiving end of the electric meter MCU.
In this embodiment, the signal transmission path is represented as follows:
1. the electric meter sends data to the copy controller: the MCU sends out a signal (TXD) → the first electro-optical conversion circuit → an optical signal (TXD) → the first electro-optical conversion circuit → an electric signal (TXD) → the MBUS interface circuit → the copy controller;
2. the controller inputs an instruction to the ammeter: the controller sends out an instruction → the MBUS interface circuit → an electric signal (RXD) → a second electro-optical conversion circuit → an optical signal (RXD) → a second electro-optical conversion circuit → the MCU receives the signal (RXD);
in an alternative embodiment, as shown in fig. 3, the MBUS interface circuit includes a diode VD2, a diode VD3, a resistor R8, and a resistor R16, and the positive terminal of the diode VD2 is the input terminal of the MBUS interface circuit; the cathode end of the diode VD3 is the output end of the MBUS interface circuit; the negative end of the diode VD2 is connected with one end of the resistor R8, the positive end of the diode VD3 is connected with the negative end of the diode VD2, and one end of the resistor R8 is connected with the copy controller; the other end of the resistor R8 is grounded; one end of the resistor R16 is connected to the negative terminal of the diode VD3, and the other end of the resistor R16 is grounded. Specifically, the positive terminal of the diode VD2 is an input terminal of the MBUS interface circuit, and is configured to receive the electrical signal (TXD) converted from the first electrical-to-optical conversion circuit; one end of the resistor R8, the negative end of the diode VD2 and the positive end of the diode VD3 are connected to serve as a common end of the MBUS interface circuit and connected with the copy controller, and the common end is configured to communicate with an external copy controller through a single signal line A, for example, to receive an instruction of the copy controller and to send an electric signal (TXD) converted by the first electro-optical conversion circuit to the copy controller; the cathode end of the diode VD3 is the output end of the MBUS interface circuit, and is configured to send the command of the copy controller to the input end of the second electro-optical conversion circuit (i.e. R11 in fig. 3) via the electrical signal (RXD) processed by the MBUS interface circuit; the other end of resistor R8 and the other end of resistor R16 are grounded to DGND.
In an alternative embodiment, as shown in fig. 3, the first electro-optical conversion circuit includes a transistor V1, a resistor R3, a resistor R6, and a light emitting tube HL 1; one end of the resistor R3 is connected with a signal output end of the electric meter MCU; the other end of the resistor R3 is connected with the base electrode of the triode V1, the emitting electrode of the triode is connected with a first power supply Vcc, the collector electrode of the triode V1 is connected with one end of the resistor R6, the other end of the resistor R6 is connected with the positive electrode end of the luminotron HL1, and the negative electrode end of the luminotron HL1 is grounded; specifically, one end of the resistor R3 is connected with a signal output end of the electric meter MCU through a signal line MCU _ TXD, and the electric meter MCU sends out a signal TXD through the signal output end of the electric meter MCU; the first power supply Vcc connected in the first electro-optical conversion circuit may be a power supply source inside the electric meter (referred to as an internal power supply for short), and the negative terminal of the light-emitting tube HL1 is grounded GND; the light emitting tube HL1, which is an optical signal emitting source of the first electro-optical conversion circuit, is configured to convert an electrical signal (TXD) output from the signal output terminal of the MCU into an optical signal (TXD), and to emit the optical signal (TXD) to (the light receiving tube BL1 of) the first electro-optical conversion circuit.
The first photoelectric conversion circuit comprises a light receiving tube BL1, a resistor 1, a resistor R1, a resistor R2, a resistor R4, a resistor R5, a resistor R7, a triode V2, a triode V3 and a triode V4; the negative end of the light receiving tube BL1 is connected with a second power supply Vdd, the positive end of the light receiving tube BL1 is connected with one end of a resistor 1, the other end of the resistor 1 is connected with the base electrode of the triode V4, one end of a resistor R1 is connected with the second power supply Vdd, and the other end of the resistor R1 is connected with the base electrode of the triode V2 and the emitting electrode of the triode V3; one end of the resistor R2 is connected with a second power supply Vdd, the other end of the resistor R2 is connected with an emitter of the triode V2, one end of the resistor R7 is connected with a base electrode of the triode V4, and the other end of the resistor R7 is grounded; the emitter of the triode V4 is grounded; one end of a resistor R5 is connected with a collector of the triode V4, the other end of a resistor R5 is connected with a collector of the triode V2 and a base of the triode V3, one end of a resistor R4 is connected with a base of the triode V2 and an emitter of the triode V3, the other end of the resistor R4 is connected with a collector of the triode V2 and a base of the triode V3, and a collector of the triode V3 is connected with an input end of the MBUS interface circuit; specifically, the second power supply Vdd connected to the first photoelectric conversion circuit may be a power supply external to the electric meter (referred to as an external power supply), the other end of the resistor R7, and the emitter ground DGND of the transistor V4. The collector of the transistor V3 serves as the output terminal (electrical signal output terminal) of the first photoelectric conversion circuit, and is configured to be connected with the input terminal (i.e., the positive terminal of VD2 in fig. 3) of the MBUS interface circuit.
In order to increase the signal transmission rate, in an alternative embodiment, referring to fig. 3, the first electrical-to-optical conversion circuit further includes a capacitor C1, and the capacitor C1 is connected in parallel across the resistor R3; the first photoelectric conversion circuit further comprises a capacitor C2 and a capacitor C3, wherein the capacitor C2 is connected in parallel to two ends of the resistor R5, and the capacitor C3 is connected in parallel to two ends of the resistor 1.
Namely, the capacitors C1, C2 and C3 play a role in signal acceleration.
In an alternative embodiment, as shown in fig. 3, the second electro-optical conversion circuit includes a light emitting tube HL2, a diode VD4, a diode VD5, a transistor V5, a MOS transistor M1, a resistor R9, a resistor R10, a resistor R11, and a resistor R13; one end of a resistor R11 is connected with the output end of the MBUS interface circuit, the other end of the resistor R11 is connected with the cathode end of a diode VD5, the anode end of the diode VD5 is connected with the grid electrode of the MOS tube M1, one end of a resistor R9 is connected with the grid electrode of the MOS tube M1, the other end of a resistor R9 is connected with the source electrode of the MOS tube M1, the cathode end of the diode VD4 is connected with the source electrode of the MOS tube M1, the anode end of the diode VD4 is connected with a second power supply Vdd, one end of the resistor R10 is connected with the second power supply Vdd, the other end of the resistor R10 is connected with the collector electrode of a triode V5, the anode end of the HL luminotron 2 is connected with the emitter electrode of the triode V5, the anode end of the HL2 is grounded, one end of the resistor R13 is connected with; specifically, the second power supply Vdd connected to the second electrical-to-optical conversion circuit may be a power supply outside the electric meter (referred to as an external power supply for short), and the positive terminal of the light-emitting tube HL2 is grounded DGND; one end of the resistor R11 serves as an input end of the second electro-optical conversion circuit and is configured to receive an electrical signal output from an output end (namely, the negative end of the VD 3) of the MBUS interface circuit; the light emitting tube HL2 is used as a light signal emitting source of the second electro-optical conversion circuit, and is configured to convert an electrical signal (RXD) output from the output end of the MBUS interface circuit into an optical signal (RXD), and emit the optical signal (RXD) to (the light receiving tube BL2) of the second electro-optical conversion circuit, and the optical signal (RXD) is photoelectrically converted into the electrical signal (RXD) by the second electro-optical conversion circuit and then is transmitted to the electric meter MCU.
The second photoelectric conversion circuit comprises a triode V6, a resistor R12, a resistor R14, a resistor R15, a resistor R17 and a light receiving tube BL 2; one end of the resistor R15 is connected with a signal receiving end of the electric meter MCU; the other end of the resistor R15 is connected with the collector of the triode V6, one end of the resistor R12 is connected with the first power supply Vcc, the other end of the resistor R12 is connected with the collector of the triode V6, and the emitter of the triode V6 is grounded; the negative end of the light receiving tube BL2 is connected with a first power supply Vcc, one end of a resistor R14 is connected with the positive end of the light receiving tube BL2, the other end of the resistor R14 is connected with the base electrode of a triode V6, one end of a resistor R17 is connected with the base electrode of a triode V6, and the other end of the resistor R17 is grounded; specifically, one end of the resistor R15 is used as the output end of the second photoelectric conversion circuit, and is connected to a signal receiving end of the electric meter MCU through a signal line MCU _ RXD, and the electric meter MCU receives the signal RXD through the signal receiving end of the electric meter MCU; the first power source Vcc connected to the first electrical-to-optical conversion circuit may be a power supply source (referred to as an internal power source) inside the electric meter, and the emitter of the transistor V6 and the other end of the resistor R17 are grounded to GND.
In order to improve the signal transmission efficiency, in an alternative embodiment, the second photoelectric conversion circuit further includes a capacitor C4, and the capacitor C4 is connected in parallel to two ends of the resistor R3; the second electro-optical conversion circuit further comprises a capacitor C5, and the capacitor C5 is connected in parallel to two ends of the resistor R13.
That is, the capacitors C4 and C5 also play a role of acceleration.
It should be noted that the diodes in the circuit shown in fig. 3 are all in one-way conduction to prevent the current from flowing in the reverse direction.
In an alternative embodiment, the luminescent tube HL1 is an infrared luminescent tube, the light receiving tube BL1 is an infrared receiving tube, and the working distance between the luminescent tube HL1 and the light receiving tube BL1 is greater than 90 mm.
In an alternative embodiment, the luminescent tube HL2 is an infrared luminescent tube, the light receiving tube BL2 is an infrared receiving tube, and the working distance between the luminescent tube HL2 and the light receiving tube BL2 is greater than 90 mm.
In this embodiment, the external strong electric protection capability of the MBUS communication circuit is in direct proportion to the distance between the infrared transmitting and receiving tube, the strong electric creepage capability is 1.2kV/mm, and the effective working distance of the infrared transmitting and receiving tube is greater than 90mm, therefore, when the MBUS interface circuit is designed as an external terminal on the electric meter, when the external terminal is attacked by external strong electric within 100kV, the first photoelectric conversion circuit, the second photoelectric conversion circuit and the MBUS interface circuit are not damaged, and the internal circuit of the electric meter (including the first photoelectric conversion circuit, the second photoelectric conversion circuit and the electric meter MCU, etc.) is not damaged by creepage.
The embodiment of the utility model provides a MBUS communication circuit, including first photoelectric isolation circuit, second photoelectric isolation circuit, MBUS interface circuit, first photoelectric isolation circuit configuration is to pass through the data that comes from ammeter MCU's signal transmission end MBUS interface circuit sends to copying the accuse ware, MBUS interface circuit configuration will the instruction of copying the accuse ware passes through second photoelectric isolation circuit transmits extremely ammeter MCU's signal reception end. Therefore, the technical scheme provided by the embodiment alleviates the problem that the prior art has poor prevention performance against external strong electric attacks. The MBUS communication circuit has the following advantages when being used for protecting an electric meter from external strong electric attack: 1) by adopting a photoelectric isolation signal transmission mode, the capability of preventing external strong current attack is strong; 2) the low-cost discrete component is adopted for construction, so that the cost is low, the discrete component is small in size, flexible in layout and high in universality; 3) the external conduction interference is isolated, the stability of the ammeter is high, and the communication capacity is strong; the communication speed can reach 9600 bps; 4) under the condition of not increasing the cost of other parts of the ammeter, the capability of preventing external strong electric attack of tens KV is achieved.
The embodiment of the utility model provides a MBUS communication system is still provided, include ammeter MCU, copy the accuse ware and as aforementioned embodiment any the MBUS communication circuit, ammeter MCU passes through MBUS communication circuit with copy accuse ware communication connection.
In an alternative embodiment, the MBUS communication system further includes a first power supply Vcc and a second power supply Vdd.
In an alternative embodiment, the first power supply Vcc is a power supply internal to the electric meter, and the second power supply Vdd is a power supply external to the electric meter.
Specifically, referring to fig. 4, the MBUS communication system includes an MCU (MCU for short), a first electrical-to-optical conversion circuit (circuit 1 for short), a second electrical-to-optical conversion circuit (circuit 2 for short), a first electrical-to-optical conversion circuit (circuit 3 for short), a second electrical-to-optical conversion circuit (circuit 4 for short), an MBUS interface circuit (circuit 5 for short), a first power source Vcc, a second power source Vdd, and a copy controller (abbreviation of an external copy controller of MBUS), wherein the first power source Vcc, which is connected between the first electrical-to-optical conversion circuit and the second electrical-to-optical conversion circuit, is a power supply source (internal power source Vcc for short) inside the MBUS, and the two circuits are directly connected to the MCU through signal lines MCU _ d and MCU _ RXD; a second power supply Vdd connected with the first photoelectric conversion circuit and the second photoelectric conversion circuit is connected with an external reading controller through a single signal wire A in a half-duplex communication mode by using a power supply (abbreviated as an external power supply Vdd) outside the ammeter;
the following specific implementation process of the signal transmission process with reference to fig. 3 and 4 is as follows:
(1) the electric meter sends data to the copy controller: the copy controller keeps a high resistance state, and the MCU controls the high-low level change of the end point (point a in fig. 3) of the signal line a by outputting a high-low level.
The electric meter MCU outputs high level through a signal line MCU _ TXD, the triode V1 is conducted, the light emitting tube HL1 is in light signal communication with the light receiving tube BL1, the triode V4 is conducted, the triode V3 is amplified, and point A outputs low level;
the electric meter MCU outputs low level through the signal line MCU _ TXD, the triode V1 is turned off, the light-emitting tube HL1 is turned off, the triode V4 is turned off, the triode V3 is saturated, and the point A outputs high level;
(2) the reading controller inputs an instruction to the ammeter: and V4 is turned off, and the copy controller realizes the high-low level change of the MCU _ RXD by changing the input impedance of the copy controller.
When the internal circuit of the copy controller is in a high-resistance state (can be set manually), the triode V3 is conducted, the current Ie3 of the emitter of the triode V3 is low, so that R1 × Ie3 is less than 0.6V, the triode V2 is turned off, the triode V3 is controlled by the triode V4, in the state, the point A, namely a half-duplex communication line, is in a high level, the grid-source voltage difference of the MOS tube M1 is 0, the MOS tube M1 is conducted, the triode V5 is conducted, the HL2 is in optical signal communication with the BL2, the triode V6 is conducted, and the MCU _ RXD is in a low level;
when the internal circuit of the copy controller is in a low-resistance state (can be set manually), the emitter current Ie3 of the triode V3 is high, so that R1 × Ie3 is greater than 0.6V, the triode V2 is switched on, the triode V3 is not controlled by the triode V4, the point A is at a low level, the gate-source extreme pressure difference of the MOS tube M1 is greater than 0.6V, the MOS tube M1 is switched off, the triode V5 is switched off, the light receiving tube BL2 is switched off, the triode V6 is switched off, and the MCU _ RXD is at a high level;
it should be noted that the triode V4 is controlled by the MCU-TXD, when the electric meter MCU-TXD sends a set of data, the triode V4 is turned off, and only under the precondition that the V4 is turned off, the controller can control the MOS transistor M1, and then send the data to the MCU-RXD.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An MBUS communication circuit, comprising: the system comprises a first photoelectric isolation circuit, a second photoelectric isolation circuit and an MBUS interface circuit, wherein the first photoelectric isolation circuit is configured to transmit data from a signal transmitting end of an electric meter MCU to a copying controller through the MBUS interface circuit, and the MBUS interface circuit is configured to transmit an instruction of the copying controller to a signal receiving end of the electric meter MCU through the second photoelectric isolation circuit.
2. The MBUS communication circuit of claim 1, wherein the first optoelectronic isolation circuit comprises a first electrical-to-optical conversion circuit and a first optical-to-electrical conversion circuit, the first electrical-to-optical conversion circuit being electrically isolated from the first optical-to-electrical conversion circuit;
the second photoelectric isolation circuit comprises a second photoelectric conversion circuit and a second photoelectric conversion circuit, and the second photoelectric conversion circuit is electrically isolated from the second photoelectric conversion circuit.
3. The MBUS communication circuit of claim 2, wherein the first electrical-to-optical conversion circuit comprises a transistor V1, a resistor R3, a resistor R6 and a light emitting tube HL 1; one end of the resistor R3 is connected with a signal output end of the electric meter MCU; the other end of the resistor R3 is connected with the base electrode of the triode V1, the emitting electrode of the triode is connected with a first power supply Vcc, the collector electrode of the triode V1 is connected with one end of the resistor R6, the other end of the resistor R6 is connected with the positive electrode end of the luminotron HL1, and the negative electrode end of the luminotron HL1 is grounded;
the first photoelectric conversion circuit comprises a light receiving tube BL1, a resistor 1, a resistor R1, a resistor R2, a resistor R4, a resistor R5, a resistor R7, a triode V2, a triode V3 and a triode V4; the negative end of the light receiving tube BL1 is connected with a second power supply Vdd, the positive end of the light receiving tube BL1 is connected with one end of a resistor 1, the other end of the resistor 1 is connected with the base electrode of the triode V4, one end of a resistor R1 is connected with the second power supply Vdd, and the other end of the resistor R1 is connected with the base electrode of the triode V2 and the emitting electrode of the triode V3; one end of the resistor R2 is connected with a second power supply Vdd, the other end of the resistor R2 is connected with an emitter of the triode V2, one end of the resistor R7 is connected with a base electrode of the triode V4, and the other end of the resistor R7 is grounded; the emitter of the triode V4 is grounded; one end of the resistor R5 is connected with the collector of the triode V4, the other end of the resistor R5 is connected with the collector of the triode V2 and the base of the triode V3, one end of the resistor R4 is connected with the base of the triode V2 and the emitter of the triode V3, the other end of the resistor R4 is connected with the collector of the triode V2 and the base of the triode V3, and the collector of the triode V3 is connected with the input end of the MBUS interface circuit.
4. The MBUS communication circuit of claim 3, wherein the first electrical-to-optical conversion circuit further comprises a capacitor C1, the capacitor C1 is connected in parallel across the resistor R3;
the first photoelectric conversion circuit further comprises a capacitor C2 and a capacitor C3, wherein the capacitor C2 is connected in parallel to two ends of the resistor R5, and the capacitor C3 is connected in parallel to two ends of the resistor 1.
5. The MBUS communication circuit according to claim 2, wherein the second electro-optical conversion circuit comprises a light emitting tube HL2, a diode VD4, a diode VD5, a transistor V5, a MOS tube M1, a resistor R9, a resistor R10, a resistor R11 and a resistor R13; one end of a resistor R11 is connected with the output end of the MBUS interface circuit, the other end of the resistor R11 is connected with the cathode end of a diode VD5, the anode end of the diode VD5 is connected with the grid electrode of the MOS tube M1, one end of a resistor R9 is connected with the grid electrode of the MOS tube M1, the other end of a resistor R9 is connected with the source electrode of the MOS tube M1, the cathode end of the diode VD4 is connected with the source electrode of the MOS tube M1, the anode end of the diode VD4 is connected with a second power supply Vdd, one end of the resistor R10 is connected with the second power supply Vdd, the other end of the resistor R10 is connected with the collector electrode of a triode V5, the anode end of the HL luminotron 2 is connected with the emitter electrode of the triode V5, the anode end of the HL2 is grounded, one end of the resistor R13 is connected with;
the second photoelectric conversion circuit comprises a triode V6, a resistor R12, a resistor R14, a resistor R15, a resistor R17 and a light receiving tube BL 2; one end of the resistor R15 is connected with a signal receiving end of the electric meter MCU; the other end of the resistor R15 is connected with the collector of the triode V6, one end of the resistor R12 is connected with the first power supply Vcc, the other end of the resistor R12 is connected with the collector of the triode V6, and the emitter of the triode V6 is grounded; the negative end of the light receiving tube BL2 is connected with a first power supply Vcc, one end of a resistor R14 is connected with the positive end of the light receiving tube BL2, the other end of the resistor R14 is connected with the base of a triode V6, one end of a resistor R17 is connected with the base of a triode V6, and the other end of the resistor R17 is grounded.
6. The MBUS communication circuit of claim 5, wherein the second photoelectric conversion circuit further comprises a capacitor C4, the capacitor C4 is connected in parallel across the resistor R3;
the second electro-optical conversion circuit further comprises a capacitor C5, and the capacitor C5 is connected in parallel to two ends of the resistor R13.
7. The MBUS communication circuit according to claim 1, wherein the MBUS interface circuit comprises a diode VD2, a diode VD3, a resistor R8 and a resistor R16, and the positive terminal of the diode VD2 is the input terminal of the MBUS interface circuit; the cathode end of the diode VD3 is the output end of the MBUS interface circuit; the negative end of the diode VD2 is connected with one end of the resistor R8, the positive end of the diode VD3 is connected with the negative end of the diode VD2, and one end of the resistor R8 is connected with the copy controller; the other end of the resistor R8 is grounded; one end of the resistor R16 is connected to the negative terminal of the diode VD3, and the other end of the resistor R16 is grounded.
8. The MBUS communication circuit of claim 3, wherein the luminescent tube HL1 adopts an infrared luminescent tube, the light receiving tube BL1 adopts an infrared receiving tube, and the working distance between the luminescent tube HL1 and the light receiving tube BL1 is more than 90 mm.
9. The MBUS communication circuit of claim 5, wherein the luminescent tube HL2 adopts an infrared luminescent tube, the light receiving tube BL2 adopts an infrared receiving tube, and the working distance between the luminescent tube HL2 and the light receiving tube BL2 is more than 90 mm.
10. An MBUS communication system, characterized by comprising an electric meter MCU, a meter reading controller and the MBUS communication circuit of any one of claims 1-9, wherein the electric meter MCU is in communication connection with the meter reading controller through the MBUS communication circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922442533.6U CN210721839U (en) | 2019-12-26 | 2019-12-26 | MBUS communication circuit and MBUS communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922442533.6U CN210721839U (en) | 2019-12-26 | 2019-12-26 | MBUS communication circuit and MBUS communication system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210721839U true CN210721839U (en) | 2020-06-09 |
Family
ID=70926656
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922442533.6U Active CN210721839U (en) | 2019-12-26 | 2019-12-26 | MBUS communication circuit and MBUS communication system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210721839U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110930682A (en) * | 2019-12-26 | 2020-03-27 | 宁波三星医疗电气股份有限公司 | MBUS communication circuit and MBUS communication system |
-
2019
- 2019-12-26 CN CN201922442533.6U patent/CN210721839U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110930682A (en) * | 2019-12-26 | 2020-03-27 | 宁波三星医疗电气股份有限公司 | MBUS communication circuit and MBUS communication system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN210721839U (en) | MBUS communication circuit and MBUS communication system | |
| CN110706954B (en) | Emergency stop switch circuit and emergency stop and reset method of emergency stop switch | |
| CN113606761B (en) | Current loop communication circuit and air conditioner | |
| CN110930682A (en) | MBUS communication circuit and MBUS communication system | |
| CN112833516B (en) | Air conditioner internal and external unit communication circuit and air conditioner | |
| CN207020501U (en) | A kind of single live wire switch and double control switch circuit | |
| CN210038197U (en) | Infrared correlation device | |
| CN216599583U (en) | Communication circuit, electronic equipment and communication system | |
| CN109445505A (en) | A kind of bus-powered circuit of DALI | |
| CN116567898A (en) | Track lamp assembly and track lighting device | |
| CN214069570U (en) | Overcurrent protection system for high-voltage direct-current constant-current input | |
| CN215956361U (en) | Anti-infrared interference switch circuit | |
| CN204350428U (en) | Dali input protection circuit | |
| CN109683650B (en) | Circuit for converting voltage into 4-20mA current | |
| CN110461061B (en) | Single-live wire circuit based on micro switch or optocoupler control | |
| CN203690926U (en) | Trigger circuit of direct light-activated thyristor | |
| CN202513560U (en) | Television, television power supply and television metal oxide semiconductor (MOS) tube short-circuit protection circuit | |
| CN207083011U (en) | A soft start circuit for switching power supply | |
| CN108155782B (en) | Flyback recovery power supply circuit | |
| CN106211479B (en) | A kind of intelligent protection circuit for buffering transient high-current | |
| CN218498820U (en) | Signal receiving circuit and electronic equipment | |
| CN218301215U (en) | Standby circuit of printer power supply | |
| CN215912088U (en) | Multifunctional USB wireless receiver and circuit thereof | |
| CN214895462U (en) | Near-infrared bidirectional communication circuit adopting single infrared transmitting tube | |
| CN110045434A (en) | A kind of infrared shooting device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |