Bidirectional isolation integrated service digital network transceiver circuit based on new national standard lithium battery charger

Abstract

The utility model relates to the technical field of communication, in particular to a two-way isolation integrated services digital network transceiver circuit based on a new national standard lithium battery charger, which comprises a battery BMS module, a two-way isolation communication circuit and a charger MCU module, and is characterized in that the two-way isolation communication circuit comprises a two-way isolation integrated services digital network module and an integrated services digital network external interface module; the battery BMS module is in communication connection with the bidirectional isolation integrated digital network module through the integrated digital network external interface module, the bidirectional isolation integrated digital network module is in communication connection with the charger MCU module, and the bidirectional isolation communication circuit is arranged, so that transmission signals of the battery BMS module can be subjected to bidirectional isolation transmission through the integrated digital network external interface module; and through the arrangement of the bidirectional isolation integrated digital network module, transmission signals of the integrated digital network external interface module and the charger MCU module can be subjected to bidirectional isolation transmission through the bidirectional isolation integrated digital network module, so that bidirectional isolation of communication transmission is realized, and the anti-interference capability of the circuit and the effective rate of signal sending and receiving are effectively improved.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to a bidirectional isolated one-line transceiver circuit based on the new national standard lithium battery charger. Background Technology

[0002] The new national standard lithium battery and charger mainly use a one-line communication method, which only requires one transmission line to realize communication between the electric vehicle lithium battery and the charger. This communication method is compatible with most old national standard models on the market, and even if they are incompatible, it is very simple to modify them, which lays the foundation for the promotion of new national standard vehicles. However, in the current use of the one-line communication method, due to insufficient lithium battery information transmitted during communication and the lack of isolation measures for communication, there are problems such as easy interference, high error rate, and high risk of MCU damage. Utility Model Content

[0003] To address the aforementioned technical issues, this application provides a bidirectional isolated one-line transceiver circuit for lithium-ion battery chargers based on the new national standard. The circuit includes a battery management system (BMS) module, a bidirectional isolated communication circuit, and a charger MCU module. The bidirectional isolated communication circuit comprises a bidirectional isolated one-line communication module and a one-line external interface module. The battery management system (BMS) module communicates with the bidirectional isolated one-line communication module through the one-line external interface module. The bidirectional isolated one-line communication module communicates with the charger MCU module, achieving bidirectional isolation in communication transmission and effectively improving the circuit's anti-interference capability and signal transmission and reception efficiency.

[0004] Preferably, the bidirectional isolation one-line communication module consists of a first isolation circuit and a second isolation circuit. The signal receiving end of the charger MCU module is connected to the battery BMS module through the first isolation circuit, and the signal transmitting end of the charger MCU module is connected to the battery BMS module through the second isolation circuit, thereby realizing bidirectional isolation of the transmission and reception of the battery BMS module and the charger MCU module.

[0005] Preferably, the first isolation circuit includes an optocoupler U1, transistors Q2 and Q3, a diode D1, resistors R1, R2, R3, R4, R5, and R7, and a capacitor C3. The power supply is connected to the collector of the receiving end of the optocoupler U1. The emitter of the receiving end of the optocoupler U1 is connected to resistor R3. The other end of resistor R3 is connected to resistor R5 and the base of transistor Q2. One end of resistor R5 is connected to the emitter of transistor Q2, and the other end of resistor R5 is grounded. The collector of transistor Q2 is connected to resistor R1 and the charger MCU module. The RXD pin of the module is connected, the other end of resistor R1 is connected to the collector of the receiver of optocoupler U1, the positive terminal of the transmitter of optocoupler U1 is connected to one end of resistor R2 and capacitor C3 respectively, the other end of resistor R2 is connected to the power supply and resistor R4 respectively, the other end of resistor R4 is connected to resistor R7 and the anode of diode D1 respectively, the other end of resistor R7 is connected to the base of transistor Q3, the emitter of transistor Q3 is connected to the negative terminal of the transmitter of optocoupler U1, the collector of transistor Q3 is grounded, and the cathode of diode D1 is connected to the SIF pin of the external interface module of the one-wire connection.

[0006] Preferably, the second isolation circuit includes resistors R9, R10, R11, R13, and R14, transistors Q4 and Q5, and optocoupler U2. The positive terminal of the emitter of optocoupler U2 is connected to resistor R9, and the other end of resistor R9 is connected to the power supply and resistor R10. The negative terminal of the emitter of optocoupler U2 is connected to the emitter of transistor Q5, the collector of transistor Q5 is grounded, and the base of transistor Q5 is connected to resistor R14. The other end of resistor R14 is connected to resistor R10 and the TXD pin of the charger MCU module. The emitter of the receiver of optocoupler U2 is connected to resistor R11, and the collector of the receiver of optocoupler U2 is connected to the power supply. The other end of resistor R11 is connected to resistor R13 and the base of transistor Q4. One end of resistor R13 is connected to the emitter of transistor Q4, and the other end of resistor R13 is grounded. The collector of transistor Q4 is connected to the cathode of diode D1.

[0007] Preferably, the bidirectional isolated communication circuit further includes a power isolation module and a power buck converter module, which supply power to the first isolation circuit and the second isolation circuit respectively, thereby converting the voltage into the voltage required by the components in the isolation circuit.

[0008] Preferably, it also includes an auxiliary power supply, which provides 12V DC power to the power isolation module and the power buck converter module. The power isolation module provides 5V power to the first isolation circuit and the second isolation circuit, and the power buck converter module provides 3.3V power to the first isolation circuit and the second isolation circuit.

[0009] As can be seen from the above, the following beneficial effects can be obtained by applying the present application: The present application, through the battery BMS module, bidirectional isolation communication circuit, and charger MCU module, wherein the bidirectional isolation communication circuit includes a bidirectional isolation one-line communication module and a one-line communication external interface module, the battery BMS module communicates with the bidirectional isolation one-line communication module through the one-line communication external interface module, and the bidirectional isolation one-line communication module communicates with the charger MCU module, by setting the bidirectional isolation communication circuit, which includes the bidirectional isolation one-line communication module and the one-line communication external interface module, enables the transmission and reception signals of the battery BMS module to be transmitted in isolation through the one-line communication external interface module, and further, by setting the bidirectional isolation one-line communication module, the transmission signals of the one-line communication external interface module and the charger MCU module can be transmitted bidirectionally in isolation through the bidirectional isolation one-line communication module, thereby achieving bidirectional isolation of communication transmission, effectively improving the circuit's anti-interference capability and signal transmission and reception efficiency. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments of this application or the prior art will be briefly introduced below. Obviously, the accompanying drawings described below are only a part of the embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a circuit diagram of the bidirectional isolation one-wire module according to an embodiment of this application;

[0012] Figure 2 This is a flowchart illustrating an embodiment of this application;

[0013] Figure 3 This is a schematic diagram of the structure of the One-Line Communication external interface module in an embodiment of this application;

[0014] Figure 4 This is a circuit diagram of the power isolation module according to an embodiment of this application;

[0015] Figure 5 This is a circuit diagram of the power step-down conversion module according to an embodiment of this application.

[0016] Figure Labels

[0017] 10. Battery Management System (BMS) module; 20. Bidirectional isolation communication circuit; 30. Charger MCU module; 21. Bidirectional isolation one-line communication module; 22. One-line communication external interface module; 23. Power isolation module; 24. Power step-down conversion module; 211. First isolation circuit; 212. Second isolation circuit. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. Example

[0019] To address the aforementioned technical problems, this embodiment provides a bidirectional isolated one-line transceiver circuit based on the new national standard lithium battery charger, such as... Figure 2 As shown, the system includes a battery management system (BMS) module 10, a bidirectional isolation communication circuit 20, and a charger MCU module 30. The bidirectional isolation communication circuit 20 includes a bidirectional isolation one-line communication module 21 and a one-line communication external interface module 22. The battery BMS module 10 is communicatively connected to the bidirectional isolation one-line communication module 21 through the one-line communication external interface module 22. The bidirectional isolation one-line communication module 21 is communicatively connected to the charger MCU module 30. By setting up the bidirectional isolation communication circuit 20, which includes the bidirectional isolation one-line communication module 21 and the one-line communication external interface module 22, the transmission and reception signals of the battery BMS module 10 can be bidirectionally isolated and transmitted through the one-line communication external interface module 21. Furthermore, by setting up the bidirectional isolation one-line communication module 22, the transmission signals of the one-line communication external interface module 21 and the charger MCU module 30 can also be bidirectionally isolated and transmitted through the bidirectional isolation one-line communication module 22, achieving bidirectional isolation in communication transmission and effectively improving the circuit's anti-interference capability and signal transmission and reception efficiency.

[0020] Specifically, the bidirectional isolation one-line communication module 21 consists of a first isolation circuit 211 and a second isolation circuit 212. The signal receiving end of the charger MCU module 30 is connected to the battery BMS module 10 through the first isolation circuit 211, and the signal transmitting end of the charger MCU module 30 is connected to the battery BMS module 10 through the second isolation circuit 212. With the first isolation circuit 211, the signal sent by the battery BMS module 10 can be isolated and transmitted to the charger MCU module 30 through the first isolation circuit 211. With the second isolation circuit 212, the feedback transmission signal of the charger MCU module 30 can be isolated and transmitted to the battery BMS module 10 through the second isolation circuit, thereby completing the bidirectional isolation transmission of signals between the battery BMS module 10 and the charger MCU module 30.

[0021] In the above scheme, such as Figure 3As shown, the first isolation circuit 211 includes an optocoupler U1, transistors Q2 and Q3, a diode D1, resistors R1, R2, R3, R4, R5, and R7, and a capacitor C3. The power supply is connected to the collector of the receiving end of optocoupler U1. The emitter of the receiving end of optocoupler U1 is connected to resistor R3. The other end of resistor R3 is connected to resistor R5 and the base of transistor Q2. One end of resistor R5 is connected to the emitter of transistor Q2, and the other end of resistor R5 is grounded. The collector of transistor Q2 is connected to resistor R1 and the RXD pin of the charger MCU module 30. The other end of resistor R1 is connected to the collector of the receiving end of optocoupler U1. The positive terminal of the emitter of optocoupler U1 is connected to one end of resistor R2 and capacitor C3. The other end of resistor R2 is connected to the power supply and resistor R4. 4. The other end is connected to resistor R7 and the anode of diode D1 respectively. The other end of resistor R7 is connected to the base of transistor Q3. The emitter of transistor Q3 is connected to the negative terminal of the emitter of optocoupler U1. The collector of transistor Q3 is grounded. The cathode of diode D1 is connected to the SIF pin of the one-line external interface module 22. After the SIF pin of the one-line external interface module 22 receives the signal sent by the battery BMS module 10, it is bidirectionally isolated by resistor R2, capacitor C3, transistor Q3, resistor R4, resistor R7, transistor Q4, resistor R11, resistor R13, optocoupler U1 and optocoupler U2 in the first isolation circuit 211. The RXD pin of the charger MCU module 30 receives the signal from the battery BMS module 10 through resistor R1, resistor R3, resistor R5 and transistor Q2.

[0022] Furthermore, such as Figure 1 As shown, for ease of illustration, Figure 1 and Figure 2Diodes D1 and D2 are the same component. The second isolation circuit 212 includes resistors R9, R10, R11, R13, and R14, transistors Q4 and Q5, and optocoupler U2. The positive terminal of the emitter of optocoupler U2 is connected to resistor R9, and the other end of resistor R9 is connected to the power supply and resistor R10. The negative terminal of the emitter of optocoupler U2 is connected to the emitter of transistor Q5. The collector of transistor Q5 is grounded, and the base of transistor Q5 is connected to resistor R14. The other end of resistor R14 is connected to resistor R10 and charger M. The TXD pin of the CU module 30 is connected to the power supply. The emitter of the receiver of the optocoupler U2 is connected to the resistor R11, and the collector of the receiver of the optocoupler U2 is connected to the power supply. The other end of the resistor R11 is connected to the resistor R13 and the base of the transistor Q4. One end of the resistor R13 is connected to the emitter of the transistor Q4, and the other end of the resistor R13 is grounded. The collector of the transistor Q4 is connected to the cathode of the diode D1. The TXD pin of the charger MCU module 30 sends a signal to the battery BMS module 10 through the resistors R9, R10, R14 and the transistor Q5.

[0023] To provide the corresponding operating voltage to the isolation circuit, as a preferred implementation, such as Figure 4 As shown, the bidirectional isolated communication circuit 20 also includes a power isolation module 23 and a power step-down conversion module 24. The power isolation module 23 and the power step-down conversion module 24 supply power to the first isolation circuit 211 and the second isolation circuit 212, respectively. With the power isolation module 23, the converted power can be used to power the components in the first isolation circuit 211. With the power step-down conversion module 24, the converted power can be used to power the components in the second isolation circuit 212.

[0024] Specifically, such as Figure 5 As shown, it also includes an auxiliary power supply, which provides 12V DC power to the power isolation module 23 and the power buck converter module 24. The power isolation module 23 provides 5V power to the first isolation circuit 211 and the second isolation circuit 212, and the power buck converter module 24 provides 3.3V power to the first isolation circuit 211 and the second isolation circuit 212. By providing the power isolation module 23, the power isolation module 23 can convert the 12V power provided by the auxiliary power supply into 5V power, and use it to power the optocoupler U1, optocoupler U2, transistor Q3, and diode D1. Then, by providing the power buck converter module 24, the power buck converter module 24 can convert the 12V power provided by the auxiliary power supply into 3.3V power, and use it to power the optocoupler U1, optocoupler U2, transistor Q2, and transistor Q5.

[0025] In summary, in one or more embodiments of this application, the present application, through the battery BMS module, bidirectional isolation communication circuit, and charger MCU module, wherein the bidirectional isolation communication circuit includes a bidirectional isolation one-line communication module and a one-line communication external interface module, the battery BMS module communicates with the bidirectional isolation one-line communication module through the one-line communication external interface module, and the bidirectional isolation one-line communication module communicates with the charger MCU module, by setting up a bidirectional isolation communication circuit, including a bidirectional isolation one-line communication module and a one-line communication external interface module, enables the transmission and reception signals of the battery BMS module to be bidirectionally isolated and transmitted through the one-line communication external interface module, and further, by setting up a bidirectional isolation one-line communication module, the transmission signals of the one-line communication external interface module and the charger MCU module can be bidirectionally isolated and transmitted through the bidirectional isolation one-line communication module, thereby achieving bidirectional isolation of communication transmission, effectively improving the circuit's anti-interference capability and signal transmission and reception efficiency.

[0026] The embodiments described above do not constitute a limitation on the scope of protection of this technical solution. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the above embodiments should be included within the scope of protection of this technical solution.

Claims

1. A bidirectional isolation one-wire pass transceiver circuit based on a new national standard lithium battery charger, characterized by: The application relates to a battery BMS module (10), a bidirectional isolation communication circuit (20) and a charger MCU module (30), wherein the bidirectional isolation communication circuit (20) comprises a bidirectional isolation one-wire communication module (21) and a one-wire communication external interface module (22), the battery BMS module (10) is in communication connection with the bidirectional isolation one-wire communication module (21) through the one-wire communication external interface module (22), and the bidirectional isolation one-wire communication module (21) is in communication connection with the charger MCU module (30).

2. The new national standard-based lithium battery charger bidirectional isolation one-wire pass transceiver circuit according to claim 1, characterized in that: The bidirectional isolation one-wire communication module (21) is composed of a first isolation circuit (211) and a second isolation circuit (212), a signal receiving end of the charger MCU module (30) is connected with the battery BMS module (10) through the first isolation circuit (211), and a signal sending end of the charger MCU module (30) is connected with the battery BMS module (10) through the second isolation circuit (212).

3. The new national standard-based lithium battery charger bidirectional isolation one-wire pass transceiver circuit according to claim 2, characterized in that: The first isolation circuit (211) comprises an optical coupler U1, a triode Q2, a triode Q3, a diode D1, resistors R1, R2, R3, R4, R5, R7 and a capacitor C3, a power supply is connected with a collector of a receiving end of the optical coupler U1, an emitter of the receiving end of the optical coupler U1 is connected with the resistor R3, the other end of the resistor R3 is connected with the resistor R5 and a base of the triode Q2 respectively, one end of the resistor R5 is connected with an emitter of the triode Q2, the other end of the resistor R5 is grounded, a collector of the triode Q2 is connected with the resistor R1 and an RXD pin of the charger MCU module (30) respectively, the other end of the resistor R1 is connected with the collector of the receiving end of the optical coupler U1, a positive pole of an emitter of the optical coupler U1 is connected with one end of the resistor R2 and the capacitor C3 respectively, the other end of the resistor R2 is connected with the power supply and the resistor R4 respectively, the other end of the resistor R4 is connected with the resistor R7 and an anode of the diode D1 respectively, the other end of the resistor R7 is connected with a base of the triode Q3, an emitter of the triode Q3 is connected with a negative pole of the emitter of the optical coupler U1, a collector of the triode Q3 is grounded, and a cathode of the diode D1 is connected with an SIF pin of the one-wire communication external interface module (22).

4. The new national standard-based lithium battery charger bidirectional isolation one-wire pass transceiver circuit according to claim 2, characterized in that: The second isolation circuit (212) comprises resistance R9, resistance R10, resistance R11, resistance R13, resistance R14, triode Q4, triode Q5, photocoupler U2, the positive electrode of the transmitting end of the photocoupler U2 is connected with the resistance R9, the other end of the resistance R9 is connected with the power supply and the resistance R10 respectively, the negative electrode of the transmitting end of the photocoupler U2 is connected with the emitting electrode of the triode Q5, the collecting electrode of the triode Q5 is grounded, the base of the triode Q5 is connected with the resistance R14, the other end of the resistance R14 is connected with the resistance R10 and the TXD pin of the charger MCU module (30) respectively, the transmitting end of the receiving end of the photocoupler U2 is connected with the resistance R11, the collecting electrode of the receiving end of the photocoupler U2 is connected with the power supply, the other end of the resistance R11 is connected with the resistance R13 and the base of the triode Q4 respectively, one end of the resistance R13 is connected with the emitting electrode of the triode Q4, the other end of the resistance R13 is grounded, the collecting electrode of the triode Q4 is connected with the negative electrode of the diode D1.

5. The new national standard-based lithium battery charger bidirectional isolation one-wire pass transceiver circuit according to claim 2, characterized in that: The bidirectional isolation communication circuit (20) further comprises a power supply isolation module (23) and a power supply step-down conversion module (24), the power supply isolation module (23) and the power supply step-down conversion module (24) supply power for the first isolation circuit (211) and the second isolation circuit (212) respectively.

6. The new national standard-based lithium battery charger bidirectional isolation one-wire pass transceiver circuit according to claim 5, characterized in that: The bidirectional isolation communication circuit (20) further comprises an auxiliary power supply, the auxiliary power supply is used for providing 12V direct current for the power supply isolation module (23) and the power supply step-down conversion module (24), the power supply isolation module (23) provides 5V power supply for the first isolation circuit (211) and the second isolation circuit (212), and the power supply step-down conversion module (24) provides 3.3V power supply for the first isolation circuit (211) and the second isolation circuit (212).

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