Communication protection circuit and electric two-wheeled vehicle

Abstract

The utility model discloses a kind of communication protection circuit and electric two-wheeled vehicle, applied to protection circuit technical field, to solve the problem of high voltage failure frequently occurred in the application process of communication chip in prior art, specifically includes: on-off control module is connected in series on the communication line between communication chip and external device, the input end of high voltage detection module is connected in the communication line between on-off control module and external device, the output end of high voltage detection module is connected with the input end of trigger control module;The output end of trigger control module is connected with the control end of on-off control module;High voltage detection module detects the sustained high voltage in communication line and outputs trigger signal;Trigger control module is controlled on-off control module to shut down communication line in response to trigger signal.This way, the propagation path of abnormal high voltage to communication chip is effectively blocked, realizes fast, active high voltage protection, avoids communication chip to be damaged due to high voltage impact, improves the reliability of communication chip under abnormal working condition.

Description

Technical Field

[0001] This utility model relates to the field of communication protection circuits, and in particular to a communication protection circuit and an electric two-wheeled vehicle. Background Technology

[0002] With the widespread use of electric two-wheelers in short-distance urban travel, the design of their electrical systems is becoming increasingly intelligent and integrated. To meet the needs of efficient and stable data communication between various electronic control units in electric two-wheelers, more and more vehicles are adopting RS-485 or CAN (Controller Area Network) buses as the overall vehicle communication architecture. This enables efficient data interaction between key components such as the vehicle controller, instrument panel, battery management system, and motor controller, thereby improving overall vehicle performance and user experience.

[0003] RS-485 and CAN buses are widely used in industrial control and automotive electronics due to their excellent anti-interference performance, long-distance communication capabilities, and high reliability. However, in the actual operating conditions of electric two-wheelers, the complex and variable working environment often exposes their communication lines to high-voltage interference, leading to damage to RS-485 or CAN communication chips. Failure of such communication chips directly causes interruption of vehicle control signal transmission, severely affecting the normal operation of the vehicle. Therefore, the frequent high-voltage failures of communication chips during application have become one of the key factors restricting the stability and operational reliability of electric two-wheeler systems. Utility Model Content

[0004] This invention provides a communication protection circuit and an electric two-wheeler to solve the problem of frequent high-voltage failures of communication chips in the application of existing technologies.

[0005] The technical solution provided by this utility model is as follows:

[0006] On the one hand, this utility model provides a communication protection circuit, including: an on / off control module, a high voltage detection module, and a trigger control module;

[0007] The on / off control module is connected in series to the communication line between the communication chip and the external device. The input terminal of the high voltage detection module is connected to the communication line between the on / off control module and the external device. The output terminal of the high voltage detection module is connected to the input terminal of the trigger control module. The output terminal of the trigger control module is connected to the control terminal of the on / off control module.

[0008] The on / off control module is used to control the connection and disconnection of communication lines;

[0009] The high-voltage detection module is used to detect continuous high voltage in communication lines and output a trigger signal.

[0010] The trigger control module is used to control the on / off control module to shut down the communication line in response to a trigger signal.

[0011] Optionally, the on / off control module includes: a first MOSFET, a second MOSFET, and a driving unit;

[0012] The source of the first MOSFET is connected to the first communication terminal of the communication chip, the drain of the first MOSFET is connected to the first communication terminal of the external device, and the gate of the first MOSFET is connected to the first output terminal of the driving unit.

[0013] The source of the second MOSFET is connected to the second communication terminal of the communication chip, the drain of the second MOSFET is connected to the second communication terminal of the external device, and the gate of the second MOSFET is connected to the second output terminal of the driving unit.

[0014] The input terminal of the drive unit is connected to an external power supply.

[0015] Optionally, the driving unit includes: a first resistor, a second resistor, and a first capacitor;

[0016] The first end of the first resistor is connected to an external power supply, and the second end of the first resistor is connected to the first end of the second resistor, the gate of the first MOSFET, and the gate of the second MOSFET, respectively.

[0017] The second terminal of the second resistor is connected to ground; the first capacitor is connected in parallel with the second resistor.

[0018] Optionally, the high-voltage detection module includes: a first diode, a second diode, a third resistor, a fourth resistor, and a fifth resistor;

[0019] The anode of the first diode is connected to the communication line between the drain of the first MOS transistor and the first communication terminal of the external device, and the cathode of the first diode is connected to the first terminal of the third resistor.

[0020] The anode of the second diode is connected to the communication line between the drain of the second MOS transistor and the second communication terminal of the external device, and the cathode of the second diode is connected to the first terminal of the third resistor.

[0021] The first end of the fourth resistor is connected to the second end of the third resistor, the second end of the fourth resistor is connected to the input end of the trigger control module, and the second end of the fourth resistor is also connected to ground via the fifth resistor.

[0022] Optionally, the trigger control module includes: a third MOSFET;

[0023] The source of the third MOSFET is connected to ground, and the drain of the third MOSFET is connected to the gate of the first MOSFET and the gate of the second MOSFET, respectively. The gate of the third MOSFET is connected to the output terminal of the high voltage detection module.

[0024] Optionally, the communication protection circuit may also include: a protection module;

[0025] The first terminal of the protection module is connected to an external power supply, the second terminal of the protection module is connected to ground, and the third terminal of the protection module is connected to the input terminal of the trigger control module.

[0026] The protection module is used to limit the voltage at the input of the trigger control module within a safe range.

[0027] Optionally, the protection module includes: a third diode and a fourth diode;

[0028] The cathode of the third diode is connected to an external power supply, the anode of the third diode is connected to the input terminal of the trigger control module and the cathode of the fourth diode, and the anode of the fourth diode is connected to ground.

[0029] Optionally, the communication protection circuit may also include: a transient absorption module;

[0030] The first end of the transient absorption module is connected to the communication line between the on / off control module and the external device, and the second end of the transient absorption module is connected to ground;

[0031] The transient absorption module is used to absorb transient high voltage input from external devices.

[0032] Optionally, the transient absorption module includes: a second capacitor, a third capacitor, a fourth capacitor, and a fifth capacitor;

[0033] The first terminal of the second capacitor is connected to the communication line between the drain of the first MOSFET and the first communication terminal of the external device, and the second terminal of the second capacitor is connected to ground via the third capacitor.

[0034] The first terminal of the fourth capacitor is connected to the communication line between the drain of the second MOSFET and the second communication terminal of the external device, and the second terminal of the fourth capacitor is connected to ground via the fifth capacitor.

[0035] On the other hand, this utility model provides an electric two-wheeled vehicle, including: a communication chip and the aforementioned communication protection circuit;

[0036] The communication chip connects to external devices through a communication protection circuit.

[0037] The beneficial effects of this utility model are as follows:

[0038] In this invention, the communication protection circuit monitors the continuous abnormal high voltage in the communication line on the external device side in real time through the high voltage detection module and outputs a trigger signal. After the trigger control module responds, it controls the on / off control module connected in series in the communication line to actively shut down the communication line, thereby completely blocking the propagation path of the abnormal high voltage to the communication chip, realizing fast and active high voltage protection, effectively avoiding damage to the communication chip due to high voltage impact, and significantly improving the reliability of the communication chip under abnormal operating conditions.

[0039] Other features and advantages of this invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings. Attached Figure Description

[0040] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0041] Figure 1 This is a schematic diagram of the first circuit structure of the communication protection circuit in this embodiment of the present invention;

[0042] Figure 2 This is a schematic diagram of the second circuit structure of the communication protection circuit in this embodiment of the present invention;

[0043] Figure 3 This is a schematic diagram of the third circuit structure of the communication protection circuit in this embodiment of the present invention;

[0044] Figure 4 This is a schematic diagram of the fourth circuit structure of the communication protection circuit in this embodiment of the present invention;

[0045] Figure 5 This is a schematic diagram of the fifth circuit structure of the communication protection circuit in this embodiment of the present utility model;

[0046] Figure 6 This is a schematic diagram of the sixth circuit structure of the communication protection circuit in this utility model embodiment;

[0047] Figure 7 This is a schematic diagram of the seventh circuit structure of the communication protection circuit in this embodiment of the present utility model;

[0048] Figure 8 This is a schematic diagram of the eighth circuit structure of the communication protection circuit in this utility model embodiment;

[0049] Figure 9This is a schematic diagram of the ninth circuit structure of the communication protection circuit in this utility model embodiment;

[0050] Figure 10 This is a schematic diagram of the communication protection circuit in an embodiment of the present invention.

[0051] Icons: 100 - Communication protection circuit; 110 - On / off control module; 111 - Drive unit; 120 - High voltage detection module; 130 - Trigger control module; 140 - Protection module; 150 - Transient absorption module; 200 - Electric two-wheeler; 210 - Communication chip; Q1 - First MOSFET; Q2 - Second MOSFET; Q3 - Third MOSFET; R1 - First resistor; R2 - Second resistor; R3 - Third resistor; R4 - Fourth resistor; R5 - Fifth resistor; C1 - First capacitor; C2 - Second capacitor; C3 - Third capacitor; C4 - Fourth capacitor; C5 - Fifth capacitor; D1 - First diode; D2 - Second diode; D3 - Third diode; D4 - Fourth diode. Detailed Implementation

[0052] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0053] This utility model embodiment provides a communication protection circuit, see reference. Figure 1 As shown, the communication protection circuit 100 includes: an on / off control module 110, a high voltage detection module 120, and a trigger control module 130;

[0054] The on / off control module 110 is connected in series to the communication line between the communication chip and the external device. The input terminal of the high voltage detection module 120 is connected to the communication line between the on / off control module 110 and the external device. The output terminal of the high voltage detection module 120 is connected to the input terminal of the trigger control module 130. The output terminal of the trigger control module 130 is connected to the control terminal of the on / off control module 110.

[0055] The on / off control module 110 is used to control the on and off of the communication line;

[0056] The high voltage detection module 120 is used to detect continuous high voltage in the communication line and output a trigger signal.

[0057] The trigger control module 130 is used to control the on / off control module 110 to shut down the communication line in response to a trigger signal.

[0058] exist Figure 1 In the communication protection circuit 100 shown, the on / off control module 110 is connected in series on the communication line between the communication chip and the external device. Specifically, the communication line typically includes at least two signal lines, such as CAN_H and CAN_L in a CAN bus, or A and B lines in an RS485 bus. The on / off control module 110 is connected in series in these two communication lines respectively. Under normal circumstances, the on / off control module 110 remains on, ensuring that the communication signal can be transmitted unimpeded between the communication chip and the external device; when an external device is detected causing a continuous abnormal high voltage on the communication line, it can quickly disconnect, cut off the communication line, and isolate the communication chip from the abnormal external device, thereby providing protection. The input terminal of the high voltage detection module 120 is connected to the communication line between the on / off control module 110 and the external device, and is used to monitor the voltage on the communication line from the external device side in real time. The output terminal of the high voltage detection module 120 is connected to the input terminal of the trigger control module 130, and when an abnormal high voltage is detected, it outputs a trigger signal to the trigger control module 130. The output terminal of the trigger control module 130 is connected to the control terminal of the on / off control module 110, receives the trigger signal from the high voltage detection module 120, and controls the on / off control module 110 to cut off the communication line according to the trigger signal.

[0059] In practical applications, under normal operating conditions, the voltage of the communication line is within the normal range. The high-voltage detection module 120 does not activate, the trigger control module 130 does not trigger, and the on / off control module 110 remains conductive, allowing the communication chip to communicate normally with external devices. When an external device malfunctions, causing a continuous high voltage, significantly higher than the normal communication voltage, to be applied to the communication line, the high-voltage detection module 120 immediately detects this abnormal high voltage and outputs a trigger signal to the trigger control module 130. Upon receiving the trigger signal, the trigger control module 130 outputs a control signal to the control terminal of the on / off control module 110, changing its state from conductive to disconnected. Once the communication line is disconnected, the high voltage from the external device can no longer be transmitted to the downstream communication chip, thus effectively protecting the communication chip.

[0060] In this way, the communication protection circuit monitors the continuous abnormal high voltage in the communication line on the external device side in real time through the high voltage detection module and outputs a trigger signal. After the trigger control module responds, it controls the on / off control module connected in series in the communication line to shut down the communication line, thereby completely blocking the propagation path of abnormal high voltage to the communication chip, realizing fast and active high voltage protection, effectively avoiding damage to the communication chip due to high voltage impact, and significantly improving the reliability of the communication chip under abnormal high voltage conditions.

[0061] In practical implementation, the on / off control module in the communication protection circuit has various structures to achieve its function; see [reference needed]. Figure 2 As shown, the on / off control module 110 includes: a first MOSFET Q1, a second MOSFET Q2, and a drive unit 111;

[0062] The source of the first MOSFET Q1 is connected to the first communication terminal of the communication chip, the drain of the first MOSFET Q1 is connected to the first communication terminal of the external device, and the gate of the first MOSFET Q1 is connected to the first output terminal of the driving unit 111.

[0063] The source of the second MOSFET Q2 is connected to the second communication terminal of the communication chip, the drain of the second MOSFET Q2 is connected to the second communication terminal of the external device, and the gate of the second MOSFET Q2 is connected to the second output terminal of the driving unit 111.

[0064] The input terminal of the drive unit 111 is connected to an external power supply.

[0065] exist Figure 2 In the communication protection circuit 100 shown, a first MOSFET Q1 is disposed on the first communication line between the communication chip and the external device, and a second MOSFET Q2 is disposed on the second communication line between the communication chip and the external device. Both the first MOSFET Q1 and the second MOSFET Q2 can be enhancement-mode N-channel MOSFETs. During normal communication, the driving unit 111 provides a stable gate voltage to the first MOSFET Q1 and the second MOSFET Q2, keeping them in the ON state. Upon receiving a trigger signal, the trigger control module 130 outputs a low-level control signal to the gates of the first MOSFET Q1 and the second MOSFET Q2, thereby OFF-ing the first MOSFET Q1 and the second MOSFET Q2.

[0066] For details, please refer to Figure 3 As shown, the driving unit 111 includes: a first resistor R1, a second resistor R2, and a first capacitor C1;

[0067] The first end of the first resistor R1 is connected to an external power supply, and the second end of the first resistor R1 is connected to the first end of the second resistor R2, the gate of the first MOSFET Q1, and the gate of the second MOSFET Q2, respectively.

[0068] The second terminal of the second resistor R2 is connected to ground; the first capacitor C1 is connected in parallel with the second resistor R2.

[0069] exist Figure 3In the communication protection circuit 100 shown, under normal operating conditions, the first resistor R1 and the second resistor R2 form a voltage divider circuit, providing a stable high-level voltage to the gates of the first MOSFET Q1 and the second MOSFET Q2. By appropriately selecting the resistance values ​​of the first resistor R1 and the second resistor R2, it can be ensured that the gate voltages input to the first MOSFET Q1 and the second MOSFET Q2 are higher than their turn-on threshold voltages, thereby keeping the first MOSFET Q1 and the second MOSFET Q2 in a stable conducting state and ensuring normal operation of the communication line. The first capacitor C1 is used to stabilize the gate voltages of the first MOSFET Q1 and the second MOSFET Q2, filter out noise interference that may exist in the external power supply or on the line, prevent gate voltage fluctuations from causing malfunctions of the first MOSFET Q1 and the second MOSFET Q2, and also provide or absorb instantaneous current when the first MOSFET Q1 and the second MOSFET Q2 switch states, making the switching action smoother.

[0070] In practical implementation, the high-voltage detection module in the communication protection circuit has various structures to achieve its function; see [reference needed]. Figure 4 As shown, the high-voltage detection module 120 includes: a first diode D1, a second diode D2, a third resistor R3, a fourth resistor R4, and a fifth resistor R5;

[0071] The anode of the first diode D1 is connected to the communication line between the drain of the first MOS transistor Q1 and the first communication terminal of the external device, and the cathode of the first diode D1 is connected to the first terminal of the third resistor R3.

[0072] The anode of the second diode D2 is connected to the communication line between the drain of the second MOS transistor Q2 and the second communication terminal of the external device, and the cathode of the second diode D2 is connected to the first terminal of the third resistor R3.

[0073] The first end of the fourth resistor R4 is connected to the second end of the third resistor R3. The second end of the fourth resistor R4 is connected to the input terminal of the trigger control module 130. The second end of the fourth resistor R4 is also connected to ground via the fifth resistor R5.

[0074] exist Figure 4 In the communication protection circuit 100 shown, the first diode D1 is used to conduct when there is an abnormal high voltage on the first communication line, transmitting the abnormal high voltage to the high voltage detection module 120. The second diode D2 is used to conduct when there is an abnormal high voltage on the second communication line, transmitting the abnormal high voltage to the high voltage detection module 120. In addition, the first diode D1 and the second diode D2 also serve as isolation to prevent mutual interference between the two communication lines during normal communication.

[0075] In practical implementation, the trigger control module in the communication protection circuit has various structures to achieve its function; see [reference needed]. Figure 5 As shown, the trigger control module 130 includes: a third MOSFET Q3;

[0076] The source of the third MOSFET Q3 is connected to ground, and the drain of the third MOSFET Q3 is connected to the gate of the first MOSFET Q1 and the gate of the second MOSFET Q2. The gate of the third MOSFET Q3 is connected to the output terminal of the high voltage detection module 120.

[0077] exist Figure 5 In the communication protection circuit 100 shown, the third MOSFET Q3 is an N-channel enhancement-mode MOSFET. When the voltages on the first and second communication lines are normal, the voltage output by the high-voltage detection module 120 is lower than the turn-on threshold of the third MOSFET Q3, and the third MOSFET Q3 is in the off state. The drain of the third MOSFET Q3 is in a high-resistance state, which has no effect on the gate voltages of the first MOSFET Q1 and the second MOSFET Q2. At this time, the gate voltages of the first MOSFET Q1 and the second MOSFET Q2 are provided by the driving unit 111 and maintained at the turn-on level, and the first and second communication lines are turned on. When there is a continuous abnormal high voltage on the first or second communication line, the voltage output by the high-voltage detection module 120 rises rapidly and exceeds the turn-on threshold of the third MOSFET Q3, causing the third MOSFET Q3 to turn on. After the third MOSFET Q3 turns on, it quickly pulls the gate voltages of the first MOSFET Q1 and the second MOSFET Q2 to ground level. After the gate voltages of the first MOSFET Q1 and the second MOSFET Q2 become 0V, the first MOSFET Q1 and the second MOSFET Q2 are immediately turned off, thereby cutting off the first communication line and the second communication line, providing reliable protection for the back-end communication chip.

[0078] In one possible implementation, see [reference] Figure 6 As shown, the communication protection circuit 100 also includes: a protection module 140;

[0079] The first terminal of the protection module 140 is connected to an external power supply, the second terminal of the protection module 140 is connected to ground, and the third terminal of the protection module 140 is connected to the input terminal of the trigger control module 130.

[0080] The protection module 140 is used to limit the voltage at the input terminal of the trigger control module 130 within a safe range.

[0081] exist Figure 6 In the communication protection circuit 100 shown, the protection module 140 is used to protect the input terminal of the trigger control module 130, that is, the gate of the third MOS transistor Q3, to prevent overvoltage or negative voltage spikes on the communication line from damaging the third MOS transistor Q3.

[0082] In practical implementation, the protection module in the communication protection circuit has various structures to achieve its function; see [reference needed]. Figure 7 As shown, the protection module 140 includes: a third diode D3 and a fourth diode D4;

[0083] The cathode of the third diode D3 is connected to an external power supply, the anode of the third diode D3 is connected to the input terminal of the trigger control module 130 and the cathode of the fourth diode D4, and the anode of the fourth diode D4 is connected to ground.

[0084] exist Figure 7 In the communication protection circuit 100 shown, the third diode D3 and the fourth diode D4 constitute a bidirectional voltage clamping protection circuit. Its core function is to limit the voltage at the input terminal of the trigger control module 130 within a safe range, preventing overvoltage or negative voltage damage to the gate of the third MOSFET Q3. During normal operation, both the third diode D3 and the fourth diode D4 are reverse-biased and do not affect signal transmission. When the voltage at the second terminal of the fourth resistor R4 abnormally rises above the sum of the external power supply voltage and the forward voltage drop of the third diode D3, the third diode D3 conducts in the forward direction, clamping the voltage at the first voltage to prevent overvoltage breakdown of the third MOSFET Q3. Here, the first voltage is the sum of the external power supply voltage and the forward voltage drop of the third diode D3. When the voltage at the second terminal of the fourth resistor R4 abnormally drops below ground level and exceeds the forward voltage drop of the fourth diode D4, the fourth diode D4 conducts in the forward direction, clamping the voltage at the second voltage to prevent negative voltage damage to the third MOSFET Q3. Here, the second voltage is ground level minus the forward voltage drop of the fourth diode D4. In this way, the gate voltage of the third MOSFET Q3 is always limited to a safe range, ensuring the reliability of the trigger control module 130.

[0085] In one possible implementation, see [reference] Figure 8 As shown, the communication protection circuit 100 also includes: a transient absorption module 150;

[0086] The first end of the transient absorption module 150 is connected to the communication line between the on / off control module 110 and the external device, and the second end of the transient absorption module 150 is connected to ground.

[0087] The transient absorption module 150 is used to absorb transient high voltage input from external devices.

[0088] exist Figure 8 In the communication protection circuit 100 shown, the transient absorption module 150 is used to absorb transient high voltages from external devices, such as electrostatic discharge (ESD) and surges.

[0089] In practical implementation, the transient absorption module in the communication protection circuit has various structures to achieve its function; see [reference needed]. Figure 9As shown, the transient absorption module 150 includes: a second capacitor C2, a third capacitor C3, a fourth capacitor C4, and a fifth capacitor C5;

[0090] The first end of the second capacitor C2 is connected to the communication line between the drain of the first MOS transistor Q1 and the first communication terminal of the external device, and the second end of the second capacitor C2 is connected to ground via the third capacitor C3.

[0091] The first terminal of the fourth capacitor C4 is connected to the communication line between the drain of the second MOSFET Q2 and the second communication terminal of the external device, and the second terminal of the fourth capacitor C4 is connected to ground via the fifth capacitor C5.

[0092] exist Figure 9 In the communication protection circuit 100 shown, the second capacitor C2 and the third capacitor C3 are connected in series and then connected between the first communication line and ground. The fourth capacitor C4 and the fifth capacitor C5 are connected in series and then connected between the second communication line and ground. The two capacitors connected in series provide a low-impedance path for high-frequency transient noise and surge pulses, bypassing these transient energies to ground, thereby preventing them from impacting subsequent devices.

[0093] Based on the same concept, this utility model also provides an electric two-wheeled vehicle, see reference. Figure 10 As shown, the electric two-wheeler 200 includes at least: a communication chip 210 and the aforementioned communication protection circuit 100;

[0094] The communication chip 210 is connected to external devices through the communication protection circuit 100.

[0095] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0096] Obviously, those skilled in the art can make various modifications and variations to the embodiments of this utility model without departing from the spirit and scope of the embodiments of this utility model. Therefore, if these modifications and variations to the embodiments of this utility model fall within the scope of the claims of this utility model and their equivalents, then this utility model also intends to include these modifications and variations.

Claims

1. A communication protection circuit, characterized in that, include: On / off control module, high voltage detection module and trigger control module; The on / off control module is connected in series on the communication line between the communication chip and the external device. The input terminal of the high-voltage detection module is connected to the communication line between the on / off control module and the external device. The output terminal of the high-voltage detection module is connected to the input terminal of the trigger control module. The output terminal of the trigger control module is connected to the control terminal of the on / off control module. The on / off control module is used to control the on and off of the communication line; The high-voltage detection module is used to detect continuous high voltage in the communication line and output a trigger signal; The trigger control module is used to control the on / off control module to shut down the communication line in response to the trigger signal.

2. The communication protection circuit according to claim 1, characterized in that, The on / off control module includes: a first MOSFET, a second MOSFET, and a driving unit; The source of the first MOS transistor is connected to the first communication terminal of the communication chip, the drain of the first MOS transistor is connected to the first communication terminal of the external device, and the gate of the first MOS transistor is connected to the first output terminal of the driving unit. The source of the second MOS transistor is connected to the second communication terminal of the communication chip, the drain of the second MOS transistor is connected to the second communication terminal of the external device, and the gate of the second MOS transistor is connected to the second output terminal of the driving unit. The input terminal of the drive unit is connected to an external power supply.

3. The communication protection circuit according to claim 2, characterized in that, The driving unit includes: a first resistor, a second resistor, and a first capacitor; The first end of the first resistor is connected to an external power supply, and the second end of the first resistor is connected to the first end of the second resistor, the gate of the first MOSFET, and the gate of the second MOSFET, respectively. The second terminal of the second resistor is connected to ground; the first capacitor is connected in parallel with the second resistor.

4. The communication protection circuit according to claim 2, characterized in that, The high-voltage detection module includes: a first diode, a second diode, a third resistor, a fourth resistor, and a fifth resistor; The anode of the first diode is connected to the communication line between the drain of the first MOS transistor and the first communication terminal of the external device, and the cathode of the first diode is connected to the first terminal of the third resistor. The anode of the second diode is connected to the communication line between the drain of the second MOS transistor and the second communication terminal of the external device, and the cathode of the second diode is connected to the first terminal of the third resistor. The first end of the fourth resistor is connected to the second end of the third resistor, the second end of the fourth resistor is connected to the input end of the trigger control module, and the second end of the fourth resistor is also connected to ground via the fifth resistor.

5. The communication protection circuit according to claim 2, characterized in that, The trigger control module includes: a third MOS transistor; The source of the third MOS transistor is connected to ground, and the drain of the third MOS transistor is connected to the gate of the first MOS transistor and the gate of the second MOS transistor, respectively. The gate of the third MOS transistor is connected to the output terminal of the high voltage detection module.

6. The communication protection circuit according to any one of claims 2-5, characterized in that, Also includes: Protection module; The first terminal of the protection module is connected to an external power supply, the second terminal of the protection module is connected to ground, and the third terminal of the protection module is connected to the input terminal of the trigger control module. The protection module is used to limit the voltage at the input terminal of the trigger control module within a safe range.

7. The communication protection circuit according to claim 6, characterized in that, The protection module includes: a third diode and a fourth diode; The cathode of the third diode is connected to an external power supply, the anode of the third diode is connected to the input terminal of the trigger control module and the cathode of the fourth diode, and the anode of the fourth diode is connected to ground.

8. The communication protection circuit according to claim 7, characterized in that, Also includes: Transient absorption module; The first end of the transient absorption module is connected to the communication line between the on / off control module and the external device, and the second end of the transient absorption module is connected to ground. The transient absorption module is used to absorb transient high voltage input from external devices.

9. The communication protection circuit according to claim 8, characterized in that, The transient absorption module includes: a second capacitor, a third capacitor, a fourth capacitor, and a fifth capacitor; The first terminal of the second capacitor is connected to the communication line between the drain of the first MOS transistor and the first communication terminal of the external device, and the second terminal of the second capacitor is connected to ground through the third capacitor. The first terminal of the fourth capacitor is connected to the communication line between the drain of the second MOS transistor and the second communication terminal of the external device, and the second terminal of the fourth capacitor is connected to ground via the fifth capacitor.

10. An electric two-wheeled vehicle, characterized in that, include: The communication chip and the communication protection circuit according to any one of claims 1-9; The communication chip is connected to external devices through the communication protection circuit.

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