Dual-power supply control circuit, power supply system and communication system

Abstract

The utility model provides a dual-power supply control circuit, a power supply system and a communication system, and relates to the field of power supply control of an electronic mechanical brake system, the dual-power supply control circuit is characterized in that a first power line is connected with a power supply end of a load module through a first power supply control switch and a first monitoring module in sequence; the second power line is connected with the power end of the load module through the second power control switch and the second monitoring module in sequence; the first control module is connected with the first power supply control switch, the first control module is connected with the first monitoring module, the first control module is connected with the load module so as to collect electric information on the load module and drive the load module to operate, and the first control module is in communication connection with the second control module; and the second control module is connected with the second power supply control switch, the second monitoring module and the load module. According to the utility model, the problem of low safety level of power supply control of an electronic control system in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the field of power supply control of an electronic mechanical brake system, in particular to a dual-power supply control circuit, a power supply system and a communication system. Background Art

[0002] With the development of automobile technology, people are beginning to pay more and more attention to the stability and safety of automobile braking systems. In order to ensure the safety of electronic control systems in electromechanical braking systems,

[0003] The braking system refers to a series of specialized devices that can force a car's speed to be reduced. Its main functions are to slow down or even stop a moving car, maintain a stable speed when driving downhill, and keep a stopped car stationary. With the development of vehicle electrification and intelligence, the demand for intelligent chassis, especially electronic braking, is increasing. The electrification of vehicles has replaced the vacuum source solution required by traditional vacuum boosters, making electronic power assist a trend.

[0004] However, existing electronic brake assist control systems are mostly based on a single-battery power supply and single-battery management model. When the power supply line fails, the system loses all brake assist, resulting in a low safety level. When this situation occurs in reality, it is often accompanied by traffic accidents and is relatively dangerous. Utility Model Content

[0005] In view of the deficiencies in the prior art, the present invention provides a dual-power supply control circuit, a power supply system and a communication system, which solve the problem of low power supply control safety level of electronic control systems in the prior art.

[0006] At least one embodiment of the present invention provides a dual power supply control circuit, comprising: a first power line, a second power line, a first power control switch, a second power control switch, a first monitoring module, a second monitoring module, a first control module, a second control module, and a load module, wherein:

[0007] The first power line is connected to the power supply end of the load module through the first power control switch and the first monitoring module in sequence;

[0008] The second power line is connected to the power supply end of the load module through the second power control switch and the second monitoring module in sequence;

[0009] The first control module is connected to the first power control switch to control the conduction depth or disconnection of the first power control switch, the first control module is connected to the first monitoring module to collect electrical information on the first power line, the first control module is connected to the load module to collect electrical information on the load module and drive the load module to operate, and the first control module is in communication with the second control module;

[0010] The second control module is connected to the second power control switch to control the conduction depth or disconnection of the second power control switch. The second control module is connected to the second monitoring module to collect electrical information on the second power line. The second control module is also connected to the load module to collect electrical information on the load module and drive the load module to operate.

[0011] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0012] By using the electrical information collected by the first control module and the second control module, when there is no problem with the two power lines, the two power lines can be controlled to output 50% of the power respectively to supply power to the load module at the same time;

[0013] When one of the power lines fails, for example, after collecting the corresponding abnormal electrical information, the first control module can quickly output the corresponding instructions to the second control module. The second control module can control the second power control switch to be fully opened to output 100% power alone to ensure the normal power supply of the load module.

[0014] After adopting the above solution, the load module is powered by dual power supply. On the one hand, compared with the single power supply method, its peak current is smaller, and on the other hand, the reliability and safety level of the system are improved.

[0015] In a dual power supply control circuit provided by one embodiment of the present invention, the first power control switch includes a first power on-off switch and a first power anti-reverse switch, and the second power control switch includes a second power on-off switch and a second power anti-reverse switch, wherein:

[0016] The first power line is connected to the first monitoring module via the first power on-off switch and the first power anti-reverse switch in sequence, and the first control module is connected to the first power on-off switch and the first power anti-reverse switch respectively;

[0017] The second power line is connected to the second monitoring module through the second power on-off switch and the second power anti-reverse switch in sequence, and the second control module is connected to the second power on-off switch and the second power anti-reverse switch respectively.

[0018] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0019] The first power on-off switch and the second power on-off switch can be used to control the conduction depth of the first power line and the second power line to change the output power of the corresponding power line; by controlling the on and off of the first power anti-reverse switch and the second power anti-reverse switch, the current in the load module can be prevented from flowing back into the first control module, the second control module or other components, causing damage to the corresponding components.

[0020] In a dual-power supply control circuit provided by one embodiment of the present invention, the first monitoring module includes a first current detection module and a first voltage detection module respectively connected to the first power control switch, and the first current detection module and the first voltage detection module are both connected to the first control module to transmit the collected current information and voltage information on the first power line to the first control module;

[0021] The second monitoring module includes a second current detection module and a second voltage detection module respectively connected to the second power control switch. The second current detection module and the second voltage detection module are both connected to the second control module to transmit the collected current information and voltage information on the second power line to the second control module.

[0022] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0023] The power output from the power line to the load module can be obtained based on the voltage information and current information collected by the first control module or the second control module to ensure that the power output from the power line is 0, 50% or 100%.

[0024] In a dual power supply control circuit provided in one embodiment of the present invention, the load module includes a load driving circuit and a load element, wherein:

[0025] The first monitoring module and the second monitoring module are respectively connected to the power supply end of the load driving circuit, and are connected to the load element through the load driving circuit;

[0026] The first control module and the second control module are respectively connected to the load driving circuit to control the operation of the load driving circuit. The first control module and the second control module are used to collect electrical information output by the load driving circuit.

[0027] In a dual-power supply control circuit provided in one embodiment of the present invention, the load module also includes a load monitoring circuit, which is arranged between the load driving circuit and the load element. The output end of the load monitoring circuit is also connected to the first control module and the second control module respectively to transmit the monitored load driving circuit output electrical information to the first control module and the second control module.

[0028] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0029] The load monitoring module can be used to feed back the load power transmitted by the load driving circuit to the load element to the first control module and the second control module in real time, thereby preventing the power outputted by the first power line and the second power line from deviating, causing the power on the load element to be too high or too low.

[0030] In a dual power supply control circuit provided in one embodiment of the present invention, the load monitoring circuit includes a drive current detection circuit, a drive voltage detection circuit and a drive temperature monitoring circuit, and the drive current detection circuit, the drive voltage detection circuit and the drive temperature monitoring circuit are all connected to the load drive circuit, and the output ends of the drive current detection circuit, the drive voltage detection circuit and the drive temperature monitoring circuit are all connected to the first control module and the second control module.

[0031] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0032] The detected voltage or current information can be used to determine the power output by the circuit to the load element. At the same time, the temperature of the load element can be detected in real time by driving the temperature monitoring circuit to avoid damage to the corresponding components caused by excessively high or low temperatures.

[0033] The utility model also provides an electronic mechanical brake power supply control system, comprising: a central control module, and a first front wheel execution module, a second front wheel execution module, a first rear wheel execution module and a second rear wheel execution module connected to the central control module, wherein:

[0034] The central control module, the first front wheel execution module, the second front wheel execution module, the first rear wheel execution module and the second rear wheel execution module are all powered by a dual power supply control circuit as described above.

[0035] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0036] After adopting the above-mentioned dual power supply control circuit, the power supply safety level of the central control module of the power supply control system, as well as the first front wheel execution module, the second front wheel execution module, the first rear wheel execution module and the second rear wheel execution module controlled by the central control module are improved, avoiding the situation where the corresponding system cannot operate due to failure of a single power supply.

[0037] The present invention also provides a communication system, which is applied to a power supply control system of an electronic mechanical brake as described above, including a dual CAN communication network, wherein the dual CAN communication network includes a first group of CAN communication lines, a second group of CAN communication lines, a first CAN transmission chip, a second CAN transmission chip, and a third control module and a fourth control module, wherein:

[0038] A first group of CAN communication lines is connected to the third control module via the first CAN transmission chip, a second group of CAN communication lines is connected to the fourth control module via the second CAN transmission chip, and the third control module is connected to the fourth control module;

[0039] The dual CAN communication network is respectively configured in the central control module, the first front wheel execution module, the second front wheel execution module, the first rear wheel execution module and the second rear wheel execution module for communication.

[0040] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0041] By using a dual CAN communication system, when one of the CAN communication lines fails, the third control module or the fourth control module can be used to promptly switch to a normally operating set of CAN communication lines, thereby improving the reliability and security of communication data.

[0042] In a communication system provided by one embodiment of the present invention, the system further includes: a first electrostatic protection module, a second electrostatic protection module, a first terminal resistor and a second terminal resistor, wherein:

[0043] The first CAN communication line is connected to the first CAN transmission chip through the first electrostatic protection module and the first terminal resistor in sequence;

[0044] The second CAN communication line is connected to the second CAN transmission chip through the second electrostatic protection module and the second terminal resistor in sequence.

[0045] In a communication system provided by one embodiment of the present invention, the first electrostatic protection module is a first ESD electrostatic protection diode, and the second electrostatic protection module is a second ESD electrostatic protection diode. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 This is a schematic diagram of the connection relationship of a dual power supply control circuit of the present invention;

[0047] Figure 2 This is a schematic diagram of the specific connection relationship of a dual power supply control circuit of the present utility model;

[0048] Figure 3 This is a schematic diagram of the connection relationship of a power supply control system for an electronic mechanical brake according to the present invention;

[0049] Figure 4 This utility model is intended to provide a specific connection relationship between dual CAN communication networks in a communication system;

[0050] Figure 5 This utility model is intended to relate to a connection relationship of a communication system;

[0051] Figure 6 This is the control logic diagram of this control system. DETAILED DESCRIPTION

[0052] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0053] Furthermore, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without mutual contradiction.

[0054] This utility model provides a dual power supply control circuit, please refer to Figure 1 As shown, it includes: a first power line, a second power line, a first power control switch, a second power control switch, a first monitoring module, a second monitoring module, a first control module, a second control module and a load module, wherein,

[0055] The first power line is connected to the power supply end of the load module through the first power control switch and the first monitoring module in sequence;

[0056] The second power line is connected to the power supply end of the load module through the second power control switch and the second monitoring module in sequence;

[0057] The first control module is connected to the first power control switch to control the conduction depth or disconnection of the first power control switch, the first control module is connected to the first monitoring module to collect electrical information on the first power line, the first control module is connected to the load module to collect electrical information on the load module and drive the load module to operate, and the first control module is in communication with the second control module;

[0058] The second control module is connected to the second power control switch to control the conduction depth or disconnection of the second power control switch. The second control module is connected to the second monitoring module to collect electrical information on the second power line. The second control module is also connected to the load module to collect electrical information on the load module and drive the load module to operate.

[0059] By using the electrical information collected by the first control module and the second control module, when there is no problem with the two power lines, the two power lines can be controlled to output 50% of the power required by the load module respectively, so as to supply power to the load module at the same time;

[0060] When one of the power lines fails, for example, after collecting the corresponding abnormal electrical information, the first control module can quickly output the corresponding instructions to the second control module. The second control module can control the second power control switch to be fully opened to output 100% of the power required by the load module alone to ensure normal power supply to the load module.

[0061] After adopting the above solution, the load module is powered by dual power supply. On the one hand, compared with the single power supply method, its peak current is smaller, and on the other hand, the reliability and safety level of the system are improved.

[0062] Specifically, all control modules mentioned in the present invention, namely the first control module, the second control module, the third control module and the fourth control module, can be implemented using an MCU control chip; Figure 1 as well as Figure 2 As shown, KL30-1 refers to the first power line, KL30-2 refers to the second power line, the first power control switch includes a first power on-off switch and a first power anti-reverse switch, the second power control switch includes a second power on-off switch and a second power anti-reverse switch, wherein,

[0063] The first power line is connected to the first monitoring module via the first power on-off switch and the first power anti-reverse switch in sequence, and the first control module is connected to the first power on-off switch and the first power anti-reverse switch respectively;

[0064] The second power line is connected to the second monitoring module through the second power on-off switch and the second power anti-reverse switch in sequence, and the second control module is connected to the second power on-off switch and the second power anti-reverse switch respectively.

[0065] The first power on-off switch and the second power on-off switch can be used to control the conduction depth of the first power line and the second power line to change the output power of the corresponding power line; by controlling the on and off of the first power anti-reverse switch and the second power anti-reverse switch, the current in the load module can be prevented from flowing back into the first control module, the second control module or other components, causing damage to the corresponding components.

[0066] Specifically, the first monitoring module includes a first current detection module and a first voltage detection module respectively connected to the first power control switch, and the first current detection module and the first voltage detection module are both connected to the first control module to transmit the collected current information and voltage information on the first power line to the first control module;

[0067] The second monitoring module includes a second current detection module and a second voltage detection module respectively connected to the second power control switch. The second current detection module and the second voltage detection module are both connected to the second control module to transmit the collected current information and voltage information on the second power line to the second control module.

[0068] The power output by the power line to the load module can be obtained based on the voltage and current information collected by the first control module or the second control module to ensure that the power output by the power line is 0, 50% or 100% of the power required by the load module.

[0069] Specifically, the load module includes a load driving circuit and a load element, wherein:

[0070] The first monitoring module and the second monitoring module are respectively connected to the power supply end of the load driving circuit, and are connected to the load element through the load driving circuit;

[0071] The first control module and the second control module are respectively connected to the load driving circuit to control the operation of the load driving circuit. The first control module and the second control module are used to collect electrical information output by the load driving circuit.

[0072] Specifically, the load module also includes a load monitoring circuit, which is arranged between the load driving circuit and the load element. The output end of the load monitoring circuit is also connected to the first control module and the second control module respectively to transmit the monitored load driving circuit output electrical information to the first control module and the second control module.

[0073] The load monitoring module can be used to feed back the load power transmitted by the load driving circuit to the load element to the first control module and the second control module in real time, thereby preventing the power outputted by the first power line and the second power line from deviating, causing the power on the load element to be too high or too low.

[0074] Specifically, the load monitoring circuit includes a drive current detection circuit, a drive voltage detection circuit and a drive temperature monitoring circuit. The drive current detection circuit, the drive voltage detection circuit and the drive temperature monitoring circuit are all connected to the load drive circuit, and the output ends of the drive current detection circuit, the drive voltage detection circuit and the drive temperature monitoring circuit are all connected to the first control module and the second control module.

[0075] The detected voltage or current information can be used to determine the power output by the circuit to the load element. At the same time, the temperature of the load element can be detected in real time by driving the temperature monitoring circuit to avoid damage to the corresponding components caused by excessively high or low temperatures.

[0076] Furthermore, in this circuit, the first power on-off switch, the first power anti-reverse switch, the first current detection module and the first voltage detection module connected to the first control module, and the second power on-off switch, the second power anti-reverse switch, the second current detection module and the second voltage detection module connected to the second control module should keep the copper foil width and length as similar as possible on the PCB board.

[0077] At this point, the working status of this circuit is described as follows:

[0078] MCU1 (i.e., the first control module) and MCU2 (i.e., the second control module) normally control the first power on / off switch, the first power anti-reverse switch, the second power on / off switch, and the second power anti-reverse switch to supply power to the subsequent load drive circuit and load components, and identify the power supply power of each path by collecting power supply current and voltage signals;

[0079] MCU1 and MCU2 simultaneously control the subsequent load drive circuit and detect the current and voltage of the drive circuit as well as the temperature of the drive module to adjust the power supply of the load drive circuit, ensuring that the power supply power of the subsequent drive circuit is twice that of the previous stage power supply and that the two power supplies of the previous stage are evenly distributed.

[0080] Under normal working conditions, the front-stage power supply power is evenly distributed and each accounts for 50%, which can effectively reduce the current and current peak of the power supply network path and enhance the reliability of the circuit.

[0081] When a single power supply path fails, the MCU only needs to cut off the failed path, and the other path can promptly make up for the required power supply path current. The power supply continuity is high, which increases the safety of the circuit function.

[0082] The utility model also provides a power supply control system for electronic mechanical brake, please refer to Figure 3 As shown, it includes: a central control module, and a first front wheel execution module, a second front wheel execution module, a first rear wheel execution module and a second rear wheel execution module connected to the central control module, wherein:

[0083] The central control module, the first front wheel execution module, the second front wheel execution module, the first rear wheel execution module and the second rear wheel execution module are all powered by a dual power supply control circuit as described above.

[0084] After adopting the above-mentioned dual power supply control circuit, the power supply safety level of the central control module of the power supply control system, as well as the first front wheel execution module, the second front wheel execution module, the first rear wheel execution module and the second rear wheel execution module controlled by the central control module are improved, avoiding the situation where the corresponding system cannot operate due to failure of a single power supply.

[0085] The utility model also provides a communication system, here please combine Figure 4 and Figure 5 As shown, a power supply control system for an electronic mechanical brake as described above includes a dual CAN communication network, wherein the dual CAN communication network includes a first group of CAN communication lines, a second group of CAN communication lines, a first CAN transmission chip, a second CAN transmission chip, and a third control module and a fourth control module, wherein:

[0086] A first group of CAN communication lines is connected to the third control module via the first CAN transmission chip, a second group of CAN communication lines is connected to the fourth control module via the second CAN transmission chip, and the third control module is connected to the fourth control module;

[0087] The dual CAN communication network is respectively configured in the central control module, the first front wheel execution module, the second front wheel execution module, the first rear wheel execution module and the second rear wheel execution module for communication.

[0088] By using a dual CAN communication system, when one of the CAN communication lines fails, the third control module or the fourth control module can be used to promptly switch to a normally operating set of CAN communication lines, thereby improving the reliability and security of communication data.

[0089] Specifically, the system further includes: a first electrostatic protection module, a second electrostatic protection module, a first terminal resistor and a second terminal resistor, wherein:

[0090] The first CAN communication line is connected to the first CAN transmission chip through the first electrostatic protection module and the first terminal resistor in sequence;

[0091] The second CAN communication line is connected to the second CAN transmission chip through the second electrostatic protection module and the second terminal resistor in sequence.

[0092] In a communication system provided by one embodiment of the present invention, the first electrostatic protection module is a first ESD electrostatic protection diode, and the second electrostatic protection module is a second ESD electrostatic protection diode.

[0093] After adopting the above solution:

[0094] Please refer to here Figure 6 As shown, after the control system of the electronic brake system is started, the system status of each control module is initialized, and then the power supply status of the two power lines is checked to see if they are normal. If both are normal, the power on / off switch and the power anti-reverse switch on the power line are turned on, and by detecting the current and voltage on the power line and the voltage and current on the load module, it is ensured that the power processed by the load module is twice the power on one power line, and the power output on each power line is the same; if the power supply status on one of the power lines is abnormal, the power on / off switch and the power anti-reverse switch on the corresponding power supply are cut off, so that the load module can be powered separately using the other power line;

[0095] While performing the above steps, check whether the status of the two CAN communication networks is normal. If normal, verify the CAN network information, then execute the control command issued by the control module, and control the execution of current, voltage or temperature detection. If one of the CAN communication lines is abnormal, use the control module to shut down the group of CAN communication networks, and use a group of CAN communication lines without faults to execute the control command.

[0096] The entire control system adopts a dual-power collaborative control power supply mode to reduce the peak current of a single power supply, which can improve the reliability and safety of the system. When a single power supply fails, only the failed power supply line needs to be cut off, which will not affect the power supply recharge of the system, thus reducing the functional safety issues caused by untimely power supply recharge.

[0097] The entire system adopts dual CAN communication coordination mode, which can ensure network data security when a single CAN fails and enhance the security and reliability of communication data.

[0098] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A dual power supply control circuit, characterized in that: include: A first power line, a second power line, a first power control switch, a second power control switch, a first monitoring module, a second monitoring module, a first control module, a second control module and a load module, wherein: The first power line is connected to the power supply end of the load module through the first power control switch and the first monitoring module in sequence; The second power line is connected to the power supply end of the load module through the second power control switch and the second monitoring module in sequence; The first control module is connected to the first power control switch to control the conduction depth or disconnection of the first power control switch, the first control module is connected to the first monitoring module to collect electrical information on the first power line, the first control module is connected to the load module to collect electrical information on the load module and drive the load module to operate, and the first control module is in communication with the second control module; The second control module is connected to the second power control switch to control the conduction depth or disconnection of the second power control switch. The second control module is connected to the second monitoring module to collect electrical information on the second power line. The second control module is also connected to the load module to collect electrical information on the load module and drive the load module to operate.

2. The dual power supply control circuit according to claim 1, characterized in that: The first power control switch includes a first power on-off switch and a first power anti-reverse switch, and the second power control switch includes a second power on-off switch and a second power anti-reverse switch, wherein: The first power line is connected to the first monitoring module via the first power on-off switch and the first power anti-reverse switch in sequence, and the first control module is connected to the first power on-off switch and the first power anti-reverse switch respectively; The second power line is connected to the second monitoring module through the second power on-off switch and the second power anti-reverse switch in sequence, and the second control module is connected to the second power on-off switch and the second power anti-reverse switch respectively.

3. The dual power supply control circuit according to claim 2, characterized in that: The first monitoring module includes a first current detection module and a first voltage detection module respectively connected to the first power control switch, and the first current detection module and the first voltage detection module are both connected to the first control module to transmit the collected current information and voltage information on the first power line to the first control module; The second monitoring module includes a second current detection module and a second voltage detection module respectively connected to the second power control switch. The second current detection module and the second voltage detection module are both connected to the second control module to transmit the collected current information and voltage information on the second power line to the second control module.

4. The dual power supply control circuit according to claim 1, wherein: The load module includes a load driving circuit and a load element, wherein: The first monitoring module and the second monitoring module are respectively connected to the power supply end of the load driving circuit, and are connected to the load element through the load driving circuit; The first control module and the second control module are respectively connected to the load driving circuit to simultaneously control the operation of the load driving circuit. The first control module and the second control module are used to collect electrical information output by the load driving circuit.

5. The dual power supply control circuit according to claim 4, characterized in that: The load module also includes a load monitoring circuit, which is arranged between the load driving circuit and the load element. The output end of the load monitoring circuit is also connected to the first control module and the second control module respectively to transmit the monitored load driving circuit output electrical information to the first control module and the second control module.

6. The dual power supply control circuit according to claim 5, characterized in that: The load monitoring circuit includes a drive current detection circuit, a drive voltage detection circuit and a drive temperature monitoring circuit. The drive current detection circuit, the drive voltage detection circuit and the drive temperature monitoring circuit are all connected to the load drive circuit, and the output ends of the drive current detection circuit, the drive voltage detection circuit and the drive temperature monitoring circuit are all connected to the first control module and the second control module.

7. A power supply control system for an electronic mechanical brake, characterized in that: include: The central control module, and the first front wheel execution module, the second front wheel execution module, the first rear wheel execution module and the second rear wheel execution module connected to the central control module, wherein: The central control module, the first front wheel execution module, the second front wheel execution module, the first rear wheel execution module and the second rear wheel execution module are all powered by a dual power supply control circuit as described in any one of claims 1 to 6.

8. A communication system, characterized in that: The power supply control system for an electronic mechanical brake according to claim 7 includes a dual CAN communication network, wherein the dual CAN communication network includes a first group of CAN communication lines, a second group of CAN communication lines, a first CAN transmission chip, a second CAN transmission chip, and a third control module and a fourth control module, wherein: A first group of CAN communication lines is connected to the third control module via the first CAN transmission chip, a second group of CAN communication lines is connected to the fourth control module via the second CAN transmission chip, and the third control module is connected to the fourth control module; The dual CAN communication network is respectively configured in the central control module, the first front wheel execution module, the second front wheel execution module, the first rear wheel execution module and the second rear wheel execution module for communication.

9. A communication system according to claim 8, characterized in that: The system further includes: a first electrostatic protection module, a second electrostatic protection module, a first terminal resistor and a second terminal resistor, wherein: The first CAN communication line is connected to the first CAN transmission chip through the first electrostatic protection module and the first terminal resistor in sequence; The second CAN communication line is connected to the second CAN transmission chip through the second electrostatic protection module and the second terminal resistor in sequence.

10. A communication system according to claim 9, characterized in that: The first electrostatic protection module is a first ESD electrostatic protection diode, and the second electrostatic protection module is a second ESD electrostatic protection diode.

Images