A battery charging and discharging control circuit

Abstract

This invention discloses a battery charging and discharging control circuit, relating to the field of voltage conversion control technology. It includes a power supply module for energy storage and discharging via the battery, and for voltage regulation; an MCU module for receiving and processing data, controlling the on / off state of the charging and discharging management module, monitoring abnormal charging and discharging states, and stopping charging and discharging control in case of an anomaly; a charging and discharging management module for charging and discharging control; a data acquisition module for acquiring battery voltage, current, and temperature signals, converting the acquired signals into digital signals, and transmitting them to the MCU module; and a communication module for controlling data interaction between the MCU module and external devices. Compared with existing technologies, the advantages of this invention are: the battery charging and discharging control circuit of this invention achieves efficient management of battery charging and discharging through an integrated modular design, improving circuit stability and safety, and realizing intelligent control through data sampling and communication modules.

Description

Technical Field

[0001] This invention relates to the field of voltage conversion control technology, specifically a battery charging and discharging control circuit. Background Technology

[0002] Batteries store electrical energy and primarily provide power to various load devices. They are mostly used in situations where there is no external power supply. Batteries need to discharge externally and need to be recharged after the battery is depleted. However, in existing technologies, the management efficiency of battery charging and discharging is low, the stability and safety of the circuit are low, and intelligent control cannot be achieved through data sampling and communication modules. Therefore, there is an urgent need for a battery charging and discharging control circuit to achieve intelligent charging and discharging management of batteries. Summary of the Invention

[0003] This invention provides a battery charging and discharging control circuit to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A battery charging and discharging control circuit includes: a power supply module, an MCU module, a charging and discharging management module, a data acquisition module, and a communication module;

[0006] The power module is used to store and discharge energy from the battery and to perform DC-DC regulation on the released electrical energy to power the MCU module.

[0007] The MCU module is used to receive and process the signals output by the data sampling module and control the on and off states of the charge and discharge management module, monitor abnormal charging and discharging states, and stop charging or discharging control when charging or discharging is abnormal.

[0008] The charge and discharge management module is used to connect to DC power. By controlling the on and off states of the switching transistor, it controls the charging and discharging circuits of the battery and controls the battery to store and discharge energy.

[0009] The data acquisition module is used to collect battery voltage, current and temperature signals, convert the collected signals into digital signals and transmit them to the MCU module;

[0010] The communication module is used to control the MCU module to interact with external devices.

[0011] The input terminal of the power supply module is connected to the charging / discharging terminal of the charging / discharging management module and the acquisition terminal of the data sampling module. The output terminal of the power supply module is connected to the power supply terminal of the MCU module. The data receiving terminal of the MCU module is connected to the output terminal of the data sampling module. The communication terminal of the MCU module is connected to the communication module. The control terminal of the MCU module is connected to the switch driver terminal of the charging / discharging management module.

[0012] As a further embodiment of the present invention: the power supply module includes: a converter U2, model number MK9019, with terminals 1 and 0 of converter U2 both grounded; terminal 3 of converter U2 connected to terminal 2 of converter U2, one end of capacitor C50, one end of capacitor C23, one end of capacitor C22, the cathode of diode D43, the cathode of diode D55, and one end of resistor R236 via resistor R57, and grounded via capacitor C76; the other end of resistor R236 is connected to the cathode of diode D21; terminal 4 of converter U2 is grounded via resistor R59; terminal 8 of converter U2 is connected to one end of inductor L1 and one end of resistor R55, and connected to terminal 7 of converter U2 via capacitor C25; the other end of inductor L1 is connected to capacitor C25. One end of capacitor C26, one end of capacitor C27, one end of capacitor C28, the first end of capacitor C51, and one end of capacitor C33 output 12V power. The other end of resistor R55 is grounded through capacitor C24. Terminal 5 of converter U2 is connected to one end of resistor R58 and one end of capacitor C32 and grounded through resistor R60. The other ends of resistor R58 and capacitor C32 are both connected to the first end of capacitor C51. The anode of diode D43, the other end of capacitor C22, the other end of capacitor C23, the other end of capacitor C50, the other end of capacitor C26, the other end of capacitor C27, the other end of capacitor C28, the second end of capacitor C51, and the other end of capacitor C33 are all grounded. The anode of diode D55 is connected to the BAT+ terminal of the battery.

[0013] As a further embodiment of the present invention: the power module also includes converter U1, the model of which is MD8333A. Terminal 2 of converter U1 is connected to one end of capacitor C30 and terminal 2 of Zener diode ZD1 and connected to 12V power through resistor R56. Terminal 3 of converter U2 is connected to one end of capacitor C31 and one end of capacitor C29 and outputs 3.3V power. Terminal 1 of Zener diode ZD1, the other end of capacitor C30, the other end of capacitor C31, the other end of capacitor C29 and terminal 1 of converter U2 are all grounded.

[0014] As a further embodiment of the present invention: the charge / discharge management module includes a MOSFET Q40, model SS027N08LS. The source of MOSFET Q40 is connected to the source of power transistor Q39, one end of capacitor C34, and ground. The other end of capacitor C34 is connected via resistor R233 to the drains of MOSFET Q40, Q39, Q51, and Q50, the cathodes of diodes D24, D29, and D54, and one end of resistor R235. The other end of resistor R235 is connected via capacitor C37 to the anodes of diodes D54, D29, and D24, the source of MOSFET Q51, and resistor R13. The first terminal of 7, the BRR terminal of the battery, and one end of a resistor module consisting of resistors R183, R147, R182, and R146 connected in parallel. The second terminal of resistor R137 is connected to the first terminal of capacitor C53 and grounded through capacitor C52. The other end of the resistor module is connected to the second terminal of capacitor C53 through resistor R148 and grounded through capacitor C54. The gate of MOSFET Q39 is connected to the first terminal of resistor R119 and the COV terminal of the MCU module through resistor R118. The second terminal of resistor R119 is connected to the gate of MOSFET Q40. The gate of MOSFET Q50 is connected to the first terminal of resistor R133 and the DOV terminal of the MCU module through resistor R132. The second terminal of resistor R133 is connected to the gate of MOSFET Q51.

[0015] As a further aspect of the present invention: the data acquisition module includes a data acquisition chip U6, the model of which is DVC1018-2, and the 45th and 44th terminals of the data acquisition chip are respectively connected to the first and second terminals of capacitor C53.

[0016] As a further embodiment of the present invention: the communication module includes an isolator U7 and a transceiver U8. The isolator U7 is model CA-IS3722HS, and the transceiver U8 is model SIT1042T. Terminal 1 of isolator U7 is connected to one end of resistor R166, one end of resistor R165, and the source of MOSFET Q57, and grounded through capacitor C71. Terminal 2 of isolator U7 is connected to the other end of resistor R166 and the CAN_RX terminal of the MCU module. Terminal 3 of isolator U7 is connected to the other end of resistor R165 and the CAN_TX terminal of the MCU module. Terminal 4 of isolator U7 is grounded. Terminal 8 of isolator U7 is connected to terminal 3 of transceiver U8, one end of capacitor C73, and the CAN_VDD power supply, and is connected to the CAN_GND ground terminal through capacitor C72. It is also connected to pin 5 of isolator U7, terminal 2 of the transceiver, and the other end of capacitor C73. Terminal 7 of isolator U7 is connected to... Connect transceiver U8 to terminal 4 via resistor R164. Connect transceiver U8 to terminal 1 via resistor R167. Connect transceiver U8 to CAN_GND ground and terminal 8 via capacitor C74. Connect transceiver U8 to the cathode of diode D48, one end of inductor L5, and one end of resistor R168 via capacitor C75. Connect transceiver U8 to transceiver U8 to terminal 6, the anode of diode D48, the other end of resistor R168, and one end of inductor L6. Connect the other ends of inductor L5 and inductor L6 to the CAN-H and CAN-L lines respectively.

[0017] Compared with the prior art, the beneficial effects of the present invention are: the battery charging and discharging control circuit of the present invention achieves efficient management of battery charging and discharging through integrated modular design, improves circuit stability and safety, and realizes intelligent control through data sampling and communication modules. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A circuit diagram of a power module provided for an example of the present invention.

[0020] Figure 2 The circuit diagram of the charge / discharge management module provided for an example of the present invention.

[0021] Figure 3 The circuit diagram of the MCU module provided for an example of the present invention.

[0022] Figure 4 A circuit diagram of a data acquisition module provided for an example of the present invention.

[0023] Figure 5 Circuit diagram of the communication module provided for an example of the present invention Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] In one embodiment, see Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 A battery charging and discharging control circuit includes: a power supply module, an MCU module, a charging and discharging management module, a data acquisition module, and a communication module;

[0026] The power module is used to store and discharge energy from the battery and to perform DC-DC regulation on the released electrical energy to power the MCU module.

[0027] The MCU module is used to receive and process the signals output by the data sampling module and control the on and off states of the charge and discharge management module, monitor abnormal charging and discharging states, and stop charging or discharging control when charging or discharging is abnormal.

[0028] The charge and discharge management module is used to connect to DC power. By controlling the on and off states of the switching transistor, it controls the charging and discharging circuits of the battery and controls the battery to store and discharge energy.

[0029] The data acquisition module is used to collect battery voltage, current and temperature signals, convert the collected signals into digital signals and transmit them to the MCU module;

[0030] The communication module is used to control the MCU module to interact with external devices.

[0031] The input terminal of the power supply module is connected to the charging / discharging terminal of the charging / discharging management module and the acquisition terminal of the data sampling module. The output terminal of the power supply module is connected to the power supply terminal of the MCU module. The data receiving terminal of the MCU module is connected to the output terminal of the data sampling module. The communication terminal of the MCU module is connected to the communication module. The control terminal of the MCU module is connected to the switch driver terminal of the charging / discharging management module.

[0032] In this embodiment, please refer to Figure 1The power module includes: Converter U2, model MK9019. Terminals 1 and 0 of Converter U2 are grounded. Terminal 3 of Converter U2 is connected via resistor R57 to terminal 2, one end of capacitor C50, one end of capacitor C23, one end of capacitor C22, the cathodes of diodes D43 and D55, and one end of resistor R236, which is grounded via capacitor C76. The other end of resistor R236 is connected to the cathode of diode D21. Terminal 4 of Converter U2 is grounded via resistor R59. Terminal 8 of Converter U2 is connected to one end of inductor L1 and one end of resistor R55, and is connected via capacitor C25 to terminal 7 of Converter U2. The other end of inductor L1 is connected to one end of capacitor C26. One end of capacitor C27, one end of capacitor C28, the first end of capacitor C51, and one end of capacitor C33 output 12V power. The other end of resistor R55 is grounded through capacitor C24. Terminal 5 of converter U2 is connected to one end of resistor R58 and one end of capacitor C32 and grounded through resistor R60. The other ends of resistor R58 and capacitor C32 are both connected to the first end of capacitor C51. The anode of diode D43, the other end of capacitor C22, the other end of capacitor C23, the other end of capacitor C50, the other end of capacitor C26, the other end of capacitor C27, the other end of capacitor C28, the second end of capacitor C51, and the other end of capacitor C33 are all grounded. The anode of diode D55 is connected to the BAT+ terminal of the battery.

[0033] In a specific embodiment, the converter U2 performs DC-DC regulation on the electrical energy released from the BAT+ terminal of the battery and outputs 12V electrical energy.

[0034] Furthermore, the power module also includes converter U1, model MD8333A. Terminal 2 of converter U1 is connected to one end of capacitor C30 and terminal 2 of Zener diode ZD1, and is connected to 12V power through resistor R56. Terminal 3 of converter U2 is connected to one end of capacitor C31 and one end of capacitor C29 and outputs 3.3V power. Terminal 1 of Zener diode ZD1, the other end of capacitor C30, the other end of capacitor C31, the other end of capacitor C29, and terminal 1 of converter U2 are all grounded.

[0035] In a specific embodiment, the converter U1 can step down the 12V power voltage and output 3.3V power.

[0036] In this embodiment, please refer to Figure 2 and Figure 3The charge / discharge management module includes MOSFET Q40, model number SS027N08LS. The source of MOSFET Q40 is connected to the source of power transistor Q39, one end of capacitor C34, and ground. The other end of capacitor C34 is connected via resistor R233 to the drains of MOSFETs Q40, Q39, Q51, and Q50, the cathodes of diodes D24, D29, and D54, and one end of resistor R235. The other end of resistor R235 is connected via capacitor C37 to the anodes of diodes D54 and D29, the source of MOSFET Q51, and the first end of resistor R137. The battery's BRR terminal and one end of a resistor module consisting of resistors R183, R147, R182, and R146 connected in parallel are connected. The second end of resistor R137 is connected to the first end of capacitor C53 and grounded through capacitor C52. The other end of the resistor module is connected to the second end of capacitor C53 through resistor R148 and grounded through capacitor C54. The gate of MOSFET Q39 is connected to the first end of resistor R119 and the COV terminal of the MCU module through resistor R118. The second end of resistor R119 is connected to the gate of MOSFET Q40. The gate of MOSFET Q50 is connected to the first end of resistor R133 and the DOV terminal of the MCU module through resistor R132. The second end of resistor R133 is connected to the gate of MOSFET Q51.

[0037] In a specific embodiment, the MOSFETs Q39, Q50, and Q51 can all be SS027N08LS. In addition, four drive modules with the same circuit structure as those for MOSFETs Q39, Q50, Q51, Q40, resistors R118, R119, R132, R133, R183, R147, R182, and R146 can be used for synchronous parallel charging and discharging control. The MCU module can be composed of an MCU and its surrounding components, and a drive amplification device composed of MOSFETs, optocouplers, etc., is used to amplify the drive signals provided by the MCU. For details, please refer to [link to relevant documentation]. Figure 3 .

[0038] In this embodiment, please refer to Figure 4 The data acquisition module includes a data acquisition chip U6, model number DVC1018-2. Terminals 45 and 44 of the data acquisition chip are connected to the first and second terminals of capacitor C53, respectively.

[0039] In practice, the data acquisition chip U6 is powered by the BAT+ terminal of the battery and can be connected to multiple NTC temperature sensors to detect the battery's temperature status. It can also perform voltage sampling processing on the charge and discharge management module through a voltage divider circuit, which will not be elaborated here.

[0040] In this embodiment, please refer to Figure 5 The communication module includes isolator U7 and transceiver U8. Isolator U7 is model CA-IS3722HS, and transceiver U8 is model SIT1042T. Terminal 1 of isolator U7 is connected to one end of resistor R166, one end of resistor R165, and the source of MOSFET Q57, and grounded through capacitor C71. Terminal 2 of isolator U7 is connected to the other end of resistor R166 and the CAN_RX terminal of the MCU module. Terminal 3 of isolator U7 is connected to the other end of resistor R165 and the CAN_TX terminal of the MCU module. Terminal 4 of isolator U7 is grounded. Terminal 8 of isolator U7 is connected to terminal 3 of transceiver U8, one end of capacitor C73, and the CAN_VDD power supply, and is connected to the CAN_GND ground terminal through capacitor C72. It also connects to pin 5 of isolator U7, terminal 2 of the transceiver, and the other end of capacitor C73. Terminal 7 of isolator U7... Connect transceiver U8 to terminal 4 via resistor R164. Connect transceiver U8 to terminal 1 via resistor R167. Connect transceiver U8 to CAN_GND ground and terminal 8 via capacitor C74. Connect transceiver U8 to the cathode of diode D48, one end of inductor L5, and one end of resistor R168 via capacitor C75. Connect transceiver U8 to transceiver U8 to terminal 6, the anode of diode D48, the other end of resistor R168, and one end of inductor L6. Connect the other ends of inductor L5 and inductor L6 to the CAN-H and CAN-L lines respectively.

[0041] In a specific embodiment, the isolator U7 is connected to the CAN_RX and CAN_TX terminals of the MCU module to perform bidirectional isolation and high-speed transmission control of signals; the transceiver U8 performs signal transmission and reception to complete CAN communication.

[0042] The working principle of a battery charging and discharging control circuit of the present invention is as follows: Converter U2 in the power module, in conjunction with surrounding components, performs DC-DC regulation on the electrical energy released from the BAT+ terminal of the battery and outputs 12V electrical energy. Then, converter U1, in conjunction with surrounding components, steps down the 12V electrical energy and outputs 3.3V electrical energy to power the MCU module. Data acquisition chip U6 in the data acquisition module, in conjunction with multiple NTC temperature sensors, detects the battery temperature and performs voltage sampling processing with a voltage divider circuit. The current across capacitor C53 can also be detected through terminals 45 and 44 of the data acquisition chip, thereby acquiring the battery current. All acquired signals are transmitted to the MCU module, which provides drive signals through the COV terminal to control MOSFET Q39. MOSFET Q40 and the eight MOSFETs connected in parallel with MOSFET Q40 in the drive module are turned on, thereby controlling the battery discharge. Similarly, the DOV terminal of the MCU module provides a drive signal to control MOSFETs Q51 and Q50 and the eight MOSFETs connected in parallel with MOSFET Q50 in the drive module to turn on, thereby controlling the battery charging. The MCU module monitors abnormal charging and discharging states based on the signals collected by the data sampling module. When abnormal charging or discharging occurs, such as overcharging, over-discharging, overvoltage, overcurrent, overtemperature, or short circuit, the MCU stops charging or discharging control and limits the charging current. The communication module completes high-speed signal transmission and CAN communication processing through isolator U7, transceiver U8, and surrounding components, controlling the MCU module to interact with external devices.

[0043] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0044] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A battery charge and discharge control circuit, characterized by comprising: The circuit includes: a power supply module, an MCU module, a charge / discharge management module, a data acquisition module, and a communication module; The power module is used to store and discharge energy from the battery and to perform DC-DC regulation on the released electrical energy to power the MCU module. The MCU module is used to receive and process the signals output by the data sampling module and control the on and off states of the charge and discharge management module, monitor abnormal charging and discharging states, and stop charging or discharging control when charging or discharging is abnormal. The charge and discharge management module is used to connect to DC power. By controlling the on and off states of the switching transistor, it controls the charging and discharging circuits of the battery and controls the battery to store and discharge energy. The data acquisition module is used to collect battery voltage, current and temperature signals, convert the collected signals into digital signals and transmit them to the MCU module; The communication module is used to control the MCU module to interact with external devices. The input terminal of the power supply module is connected to the charging / discharging terminal of the charging / discharging management module and the acquisition terminal of the data sampling module. The output terminal of the power supply module is connected to the power supply terminal of the MCU module. The data receiving terminal of the MCU module is connected to the output terminal of the data sampling module. The communication terminal of the MCU module is connected to the communication module. The control terminal of the MCU module is connected to the switch driver terminal of the charging / discharging management module.

2. The battery charge and discharge control circuit according to claim 1, wherein The power module includes: a converter U2, model MK9019; terminals 1 and 0 of converter U2 are grounded; terminal 3 of converter U2 is connected to terminal 2, one end of capacitor C50, one end of capacitor C23, one end of capacitor C22, the cathodes of diodes D43 and D55, and one end of resistor R236 via resistor R57, and is grounded via capacitor C76; the other end of resistor R236 is connected to the cathode of diode D21; terminal 4 of converter U2 is grounded via resistor R59; terminal 8 of converter U2 is connected to one end of inductor L1 and one end of resistor R55, and is connected to terminal 7 of converter U2 via capacitor C25; the other end of inductor L1 is connected to one end of capacitor C26. One end of capacitor C27, one end of capacitor C28, the first end of capacitor C51, and one end of capacitor C33 output 12V power. The other end of resistor R55 is grounded through capacitor C24. Terminal 5 of converter U2 is connected to one end of resistor R58 and one end of capacitor C32 and grounded through resistor R60. The other ends of resistor R58 and capacitor C32 are both connected to the first end of capacitor C51. The anode of diode D43, the other end of capacitor C22, the other end of capacitor C23, the other end of capacitor C50, the other end of capacitor C26, the other end of capacitor C27, the other end of capacitor C28, the second end of capacitor C51, and the other end of capacitor C33 are all grounded. The anode of diode D55 is connected to the BAT+ terminal of the battery.

3. The battery charge and discharge control circuit according to claim 2, wherein The power module also includes converter U1, model MD8333A. Terminal 2 of converter U1 is connected to one end of capacitor C30 and terminal 2 of Zener diode ZD1, and is connected to 12V power through resistor R56. Terminal 3 of converter U2 is connected to one end of capacitor C31 and one end of capacitor C29 and outputs 3.3V power. Terminal 1 of Zener diode ZD1, the other end of capacitor C30, the other end of capacitor C31, the other end of capacitor C29, and terminal 1 of converter U2 are all grounded.

4. The battery charge and discharge control circuit according to claim 3, wherein The charge / discharge management module includes a MOSFET Q40, model SS027N08LS. The source of MOSFET Q40 is connected to the source of power transistor Q39, one end of capacitor C34, and ground. The other end of capacitor C34 is connected via resistor R233 to the drains of MOSFETs Q40, Q39, Q51, and Q50, the cathodes of diodes D24, D29, and D54, and one end of resistor R235. The other end of resistor R235 is connected via capacitor C37 to the anodes of diodes D54 and D29, the source of MOSFET Q51, and the first end of resistor R137. The battery's BRR terminal and one end of a resistor module consisting of resistors R183, R147, R182, and R146 connected in parallel are connected. The second end of resistor R137 is connected to the first end of capacitor C53 and grounded through capacitor C52. The other end of the resistor module is connected to the second end of capacitor C53 through resistor R148 and grounded through capacitor C54. The gate of MOSFET Q39 is connected to the first end of resistor R119 and the COV terminal of the MCU module through resistor R118. The second end of resistor R119 is connected to the gate of MOSFET Q40. The gate of MOSFET Q50 is connected to the first end of resistor R133 and the DOV terminal of the MCU module through resistor R132. The second end of resistor R133 is connected to the gate of MOSFET Q51.

5. The battery charge and discharge control circuit according to claim 4, wherein The data acquisition module includes a data acquisition chip U6, model DVC1018-2. Terminals 45 and 44 of the data acquisition chip are connected to the first and second terminals of capacitor C53, respectively.

6. The battery charge and discharge control circuit according to claim 5, wherein The communication module includes an isolator U7 and a transceiver U8. Isolator U7 is model CA-IS3722HS, and transceiver U8 is model SIT1042T. Terminal 1 of isolator U7 is connected to one end of resistor R166, one end of resistor R165, and the source of MOSFET Q57, and grounded through capacitor C71. Terminal 2 of isolator U7 is connected to the other end of resistor R166 and the CAN_RX terminal of the MCU module. Terminal 3 of isolator U7 is connected to the other end of resistor R165 and the CAN_TX terminal of the MCU module. Terminal 4 of isolator U7 is grounded. Terminal 8 of isolator U7 is connected to terminal 3 of transceiver U8, one end of capacitor C73, and the CAN_VDD power supply, and is connected to the CAN_GND ground terminal through capacitor C72. It also connects to pin 5 of isolator U7, terminal 2 of the transceiver, and the other end of capacitor C73. Terminal 7 of isolator U7 is connected to... Connect transceiver U8 to terminal 4 via resistor R164. Connect transceiver U8 to terminal 1 via resistor R167. Connect transceiver U8 to CAN_GND ground and terminal 8 via capacitor C74. Connect transceiver U8 to the cathode of diode D48, one end of inductor L5, and one end of resistor R168 via capacitor C75. Connect transceiver U8 to transceiver U8 to terminal 6, the anode of diode D48, the other end of resistor R168, and one end of inductor L6. Connect the other ends of inductor L5 and inductor L6 to the CAN-H and CAN-L lines respectively.

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