Charging pile temperature monitoring and emergency power-off system and charging pile

Abstract

The utility model belongs to the technical field of charging pile monitoring and control, and particularly provides a charging pile temperature monitoring and emergency power-off system, which is characterized in that temperature sensors are arranged in a charging pile and a charging socket, and the temperature sensors are connected with a controller through a data acquisition and processing module; the controller is connected with an alarm module; the charging pile power supply interface is connected with the circuit system through the switching circuit; the controller is connected with the switching circuit; the switching circuit comprises a bidirectional silicon controlled rectifier and a triode Q3, a first anode end of the bidirectional silicon controlled rectifier is connected to a live wire end of the charging pile power supply interface, a second anode end of the bidirectional silicon controlled rectifier is connected to a live wire end of the circuit system, and a null line end of the circuit system is connected with a null line end of the charging pile power supply interface; the gating end of the bidirectional silicon controlled rectifier is connected to the collector electrode of a triode Q3 through a resistor R22, the emitter electrode of the triode Q3 is grounded, and the base electrode of the triode Q3 is connected to the controller through a resistor R23. And safety accidents caused by over-high temperature are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of charging pile monitoring and control, and in particular to a charging pile temperature monitoring and emergency power-off system and a charging pile. Background Art

[0002] As an indispensable charging infrastructure for electric vehicles, the safety and stability of charging piles are becoming increasingly important. The charging process of electric vehicles involves complex power conversion and battery management, and any minor faults or abnormalities in these processes may lead to serious consequences. In particular, when the battery is aging, the circuit system is overheated, or the charger fails, the temperature of the charging pile tends to rise abnormally, which is a major hidden danger of safety accidents such as fire.

[0003] In the past, the temperature monitoring of charging piles usually relied on manual inspections or the use of temperature sensors. However, manual inspections are not only inefficient, but also difficult to monitor in real time, and often fail to detect temperature anomalies in time. Secondly, when temperature anomalies are detected by sensors, traditional charging piles often have to rely on manual power-off operations, which increases the difficulty of operation and may aggravate the severity of safety accidents due to untimely operations.

[0004] Therefore, with the rapid development of the electric vehicle industry and the growing demand for charging, it is particularly important to conduct emergency response to abnormal temperature monitoring of charging piles. This requires not only improving the response speed, but also ensuring that emergency measures can be taken quickly and effectively when temperature abnormalities are found to maximize charging safety. Summary of the invention

[0005] In order to solve the above problems, the utility model provides a charging pile temperature monitoring and emergency power-off system and a charging pile.

[0006] In the first aspect, the technical solution of the utility model provides a charging pile temperature monitoring and emergency power-off system, wherein a circuit system is arranged in the charging pile body; a charging pile power supply interface and a plurality of charging sockets are arranged on the charging pile body, and the charging pile power supply interface is connected to the circuit system through a switch circuit; a temperature sensor is arranged in the charging socket or at a position with a set threshold value from the charging socket, and the temperature sensor is connected to a controller through a data acquisition and processing module; the controller is connected to an alarm module; and the controller is connected to the switch circuit;

[0007] The data acquisition processing module includes an amplifying and filtering circuit and a data acquisition circuit; the temperature sensor is connected to the amplifying and filtering circuit; the amplifying and filtering circuit is connected to the data acquisition circuit; the data acquisition circuit is connected to the controller;

[0008] The switching circuit includes a bidirectional thyristor and a transistor Q3. The first anode end of the bidirectional thyristor is connected to the live wire end of the charging pile power supply interface, the second anode end of the bidirectional thyristor is connected to the live wire end of the circuit system, the neutral wire end of the circuit system is connected to the neutral wire end of the charging pile power supply interface, the gate end of the bidirectional thyristor is connected to the collector of the transistor Q3 through a resistor R22, the emitter of the transistor Q3 is grounded, and the base of the transistor Q3 is connected to the controller through a resistor R23.

[0009] As a preferred embodiment of the technical solution of the utility model, a power supply module is also provided in the charging pile body;

[0010] The power supply module includes an AC-DC conversion circuit and a DC conversion circuit;

[0011] The input end of the AC / DC conversion circuit is connected to the charging pile power supply interface, the output end of the AC / DC conversion circuit is connected to the input end of the DC conversion circuit, and the output end of the DC conversion circuit is respectively connected to the data acquisition and processing module, the controller, the alarm module and the switch circuit.

[0012] As a preferred embodiment of the technical solution of the utility model, the AC-DC conversion circuit includes a transformer, a rectifier bridge and a relay; the high-voltage side of the transformer is connected to the charging pile power supply interface, and the low-voltage side of the transformer is provided with a first terminal, an intermediate terminal and a second terminal, the first terminal is connected to the normally closed contact of the relay, the intermediate terminal is connected to the normally open contact of the relay, the second terminal is connected to an input end of the rectifier bridge, the common end of the relay is connected to the other input end of the rectifier bridge, the output end of the rectifier bridge outputs the first power supply to one end of the relay coil, the other end of the relay coil is connected to the collector of the transistor Q1, and the two ends of the relay coil are connected in parallel with a diode D5;

[0013] The output end of the rectifier bridge is also connected to a comparator U1, the positive input end of the comparator U1 is connected to a reference voltage, the negative input end of the comparator U1 is connected to the output end of the rectifier bridge through a resistor R4 and a resistor R5 connected in series, the negative input end of the comparator U1 is also connected to ground through a resistor R6 and a resistor R7 connected in series, the negative input end of the comparator U1 is also connected to ground through a capacitor C2, the output end of the comparator U1 is also connected to the positive input end of the comparator U1 through a resistor R2, the output end of the comparator U1 is connected to the base of the transistor Q1 through a resistor R1, and the base of the transistor Q1 is also grounded through a capacitor C1.

[0014] As a preferred embodiment of the technical solution of the utility model, the DC conversion circuit includes a Schottky diode and a voltage conversion chip;

[0015] The input end of the Schottky diode is connected to the output end of the rectifier bridge, the output end of the Schottky diode is grounded through capacitors C3 and C4 connected in parallel, the input end of the Schottky diode is also grounded through diode D6, the output end of the Schottky diode is connected to the input end of the voltage conversion chip, the output end of the voltage conversion chip outputs the second power supply through inductor L1, the first end of the inductor is grounded through a voltage regulator tube D7, the second end of the inductor L1 is connected to the feedback end of the voltage conversion chip, and the second end of the inductor L1 is also grounded through capacitors C5, C6 and C7 connected in parallel.

[0016] As a preferred embodiment of the technical solution of the utility model, the output end of the power supply module is connected to an amplifying and filtering circuit through a voltage stabilizing and conditioning circuit;

[0017] The data acquisition circuit includes an AD acquisition chip;

[0018] The output end of the amplifying and filtering circuit is connected to the AD acquisition chip.

[0019] As a preferred embodiment of the technical solution of the utility model, the temperature sensor adopts a thermistor, and the voltage stabilizing conditioning circuit includes a voltage stabilizing diode D8. The two ends of the voltage stabilizing diode D8 are connected in parallel with resistors R17 and R18 which are connected in series. The connection point of resistors R17 and R18 is connected to the middle end of the voltage stabilizing diode D8. The anode of the voltage stabilizing diode D8 is grounded, and the second power supply is connected to the cathode of the voltage stabilizing diode D8 through resistor R16. The two ends of the voltage stabilizing diode D8 are also connected in parallel with resistors R19, R20 and thermistor which are connected in series.

[0020] As a preferred embodiment of the technical solution of the utility model, the amplifying and filtering circuit includes an amplifier U4 and an amplifier U5;

[0021] The positive input terminal of the amplifier U4 is connected to the cathode of the voltage-regulating diode D8 through the resistor R21, and the positive input terminal of the amplifier U4 is also grounded through the potentiometer. The reverse input terminal of the amplifier U4 is connected to the connection point of the resistor R20 and the thermistor. The output terminal of the amplifier U4 is connected to the reverse input terminal of the amplifier U5 through the resistor R9. The positive input terminal of the amplifier U5 is grounded through the resistor R10. The output terminal of the amplifier U5 is connected to the reverse input terminal of the amplifier U5 through the resistor R11 and the capacitor C11 connected in parallel, and the output terminal of the amplifier U5 is connected to the AD acquisition chip.

[0022] As a preferred embodiment of the technical solution of the utility model, the control module is connected to a communication module;

[0023] The communication module includes a wireless communication module and an RS485 module.

[0024] As the preferred embodiment of the technical solution of the utility model, the RS485 module includes a 485 chip and an RS485 communication interface;

[0025] The signal input end of the 485 chip is connected to the controller, the power end of the 485 chip is connected to the second power supply, and the output end of the 485 chip is connected to the RS485 communication interface.

[0026] In a second aspect, the technical solution of the utility model also provides a charging pile with temperature monitoring and emergency power-off functions, including the temperature monitoring and emergency power-off system as described in the first aspect.

[0027] It can be seen from the above technical solutions that the utility model has the following advantages: by setting a temperature sensor in the charging pile body, real-time monitoring of the charging pile temperature is achieved. At the same time, the temperature signal is amplified and collected by the data acquisition and processing module, which improves the accuracy and response speed of temperature monitoring and can better ensure charging safety. In addition, the system also immediately controls the switch circuit to cut off the power supply of the charging pile when the controller determines that the temperature exceeds the threshold, realizing the emergency power-off function, thereby avoiding safety accidents caused by excessive temperature.

[0028] In addition, the utility model has a reliable design principle, a simple structure and a very broad application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 It is a schematic connection block diagram of an embodiment of the utility model.

[0031] Figure 2 It is a switch circuit connection diagram of an embodiment of the utility model.

[0032] Figure 3 It is a connection diagram of an AC-DC conversion circuit of an embodiment of the utility model.

[0033] Figure 4 It is a connection diagram of a DC conversion circuit of an embodiment of the utility model.

[0034] Figure 5 It is a connection diagram of the voltage stabilizing and regulating and amplifying circuit of an embodiment of the utility model.

[0035] Figure 6 It is a circuit connection diagram of the RS485 module of the utility model embodiment. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0037] like Figure 1 and Figure 2 As shown, the embodiment of the utility model provides a charging pile temperature monitoring and emergency power-off system, wherein a circuit system is arranged in the charging pile body; a charging pile power supply interface and a plurality of charging sockets are arranged on the charging pile body, and the charging pile power supply interface is connected to the circuit system through a switch circuit; a temperature sensor is arranged in the charging socket or at a position away from a set threshold value of the charging socket, and the temperature sensor is connected to a controller through a data acquisition and processing module; the controller is connected to an alarm module; and the controller is connected to the switch circuit;

[0038] The data acquisition processing module includes an amplifying and filtering circuit and a data acquisition circuit; the temperature sensor is connected to the amplifying and filtering circuit; the amplifying and filtering circuit is connected to the data acquisition circuit; the data acquisition circuit is connected to the controller;

[0039] The switching circuit includes a bidirectional thyristor and a transistor Q3. The first anode end of the bidirectional thyristor is connected to the live wire end of the charging pile power supply interface, the second anode end of the bidirectional thyristor is connected to the live wire end of the circuit system, the neutral wire end of the circuit system is connected to the neutral wire end of the charging pile power supply interface, the gate end of the bidirectional thyristor is connected to the collector of the transistor Q3 through a resistor R22, the emitter of the transistor Q3 is grounded, and the base of the transistor Q3 is connected to the controller through a resistor R23.

[0040] Under normal conditions, the transistor Q3 and the bidirectional thyristor in the switch circuit are in the on state. The temperature sensor collects the temperature of the charging socket, processes the collected signal through the data acquisition and processing module, and outputs the processed result to the controller. The preset and processing module in the controller processes the collected signal and compares the processed data with the preset threshold and outputs the control signal to the switch circuit according to the comparison result. When the temperature is greater than the preset threshold, it is judged that the temperature is abnormal, the controller outputs a low-level signal and latches the low-level signal and outputs it to the switch circuit, the base of the transistor Q3 inputs a low level, the transistor Q3 is turned off, the bidirectional thyristor is turned off, and the circuit system disconnects the connection with the charging pile power supply interface. The power supply on-off control through the thyristor has a fast response speed and will not generate arcs.

[0041] It should be noted that the charging pile body, as the supporting structure of the entire system, has multiple charging sockets for connecting to the charging plugs of electric vehicles for charging. The charging sockets are installed on the charging pile body, and a temperature sensor is installed inside each charging socket or at an appropriate position near the charging socket. The temperature sensor is used to monitor the temperature of the charging socket in real time and send the temperature data to the data acquisition and processing module. The temperature sensor uses a high-precision, high-stability thermocouple as a temperature measurement element to ensure accurate measurement and fast response.

[0042] The controller receives the temperature data sent by the data collector and processes the data. When the controller detects that the temperature of a charging socket rises abnormally and exceeds the preset safety threshold, the controller will immediately issue a command to cut off the power supply of the charging socket by controlling the circuit system of the charging pile body. At the same time, the controller can also send the abnormal temperature information to the remote monitoring center through the RS485 module or to the user terminal through the wireless communication module, so as to promptly notify relevant personnel for processing.

[0043] In some embodiments, the charging pile is further provided with a display module: installed in a prominent position of the charging pile body, for displaying the temperature of each charging socket in real time. The display module adopts a high-definition, easy-to-read LCD display screen, which is convenient for users to understand the temperature during the charging process.

[0044] The alarm module is connected to the controller. When the controller detects that the temperature of a charging socket exceeds the preset safety threshold, the alarm module will be triggered immediately, and the speaker will emit a continuous beeping sound or a flashing red light to ensure that it can be detected in time even in noisy or low-light environments.

[0045] In some embodiments, a power supply module is also provided in the charging pile body;

[0046] The power supply module includes an AC-DC conversion circuit and a DC conversion circuit;

[0047] The input end of the AC / DC conversion circuit is connected to the charging pile power supply interface, the output end of the AC / DC conversion circuit is connected to the input end of the DC conversion circuit, and the output end of the DC conversion circuit is respectively connected to the data acquisition and processing module, the controller, the alarm module and the switch circuit.

[0048] In some embodiments, Figure 3As shown, the AC-DC conversion circuit includes a transformer T, a rectifier bridge (generated by diodes D1, D2, D3, and D4 that play a rectifying role) and a relay KM; the high-voltage side of the transformer T is connected to the charging pile power supply interface, and the low-voltage side of the transformer is provided with a first terminal A, an intermediate terminal B, and a second terminal C, the first terminal is connected to the normally closed contact of the relay, the intermediate terminal is connected to the normally open contact of the relay, the second terminal is connected to one input end of the rectifier bridge, the common end of the relay is connected to the other input end of the rectifier bridge, and the output end of the rectifier bridge outputs the first power supply to one end of the relay coil, the other end of the relay coil is connected to the collector of the transistor Q1, and the two ends of the relay coil are connected in parallel with a diode D5;

[0049] The output end of the rectifier bridge is also connected to a comparator U1, the positive input end of the comparator U1 is connected to a reference voltage, the negative input end of the comparator U1 is connected to the output end of the rectifier bridge through a resistor R4 and a resistor R5 connected in series, the negative input end of the comparator U1 is also connected to ground through a resistor R6 and a resistor R7 connected in series, the negative input end of the comparator U1 is also connected to ground through a capacitor C2, the output end of the comparator U1 is also connected to the positive input end of the comparator U1 through a resistor R2, the output end of the comparator U1 is connected to the base of the transistor Q1 through a resistor R1, and the base of the transistor Q1 is also grounded through a capacitor C1.

[0050] It should be noted that the reference voltage in the present application is provided by a constant voltage module arranged in the charging pile under normal conditions. During use, the constant voltage module needs to be charged regularly to ensure the working state.

[0051] The signals at the two input terminals of the comparator U1 are compared. If the first power supply voltage output by the rectifier bridge is too high, the output terminal of the comparator U1 is at a high level, thereby turning on the transistor Q1, energizing the relay coil, disconnecting the common contact of the relay from the normally closed contact and closing the normally open contact, and changing the number of turns of the transformer by connecting the endpoints to reduce the output voltage and change the problem of excessive output.

[0052] In some embodiments, Figure 4 As shown, the DC conversion circuit includes a Schottky diode and a voltage conversion chip;

[0053] The input end of the Schottky diode is connected to the output end of the rectifier bridge, the output end of the Schottky diode is grounded through capacitors C3 and C4 connected in parallel, the input end of the Schottky diode is also grounded through diode D6, the output end of the Schottky diode is connected to the input end of the voltage conversion chip, the output end of the voltage conversion chip outputs the second power supply through inductor L1, the first end of the inductor is grounded through a voltage regulator tube D7, the second end of the inductor L1 is connected to the feedback end of the voltage conversion chip, and the second end of the inductor L1 is also grounded through capacitors C5, C6 and C7 connected in parallel.

[0054] In some embodiments, the output end of the power supply module is connected to an amplification and filtering circuit via a voltage stabilization and conditioning circuit;

[0055] The data acquisition circuit includes an AD acquisition chip;

[0056] The output end of the amplifying and filtering circuit is connected to the AD acquisition chip.

[0057] The temperature sensor uses a thermistor, such as Figure 5 As shown, the voltage regulating circuit includes a voltage stabilizing diode D8, and two ends of the voltage stabilizing diode D8 are connected in parallel with a resistor R17 and a resistor R18 which are connected in series, and the connection point of the resistor R17 and the resistor R18 is connected to the middle end of the voltage stabilizing diode D8, the anode of the voltage stabilizing diode D8 is grounded, and the second power supply is connected to the cathode of the voltage stabilizing diode D8 through the resistor R16; two ends of the voltage stabilizing diode D8 are also connected in parallel with a resistor R19, a resistor R20 and a thermistor which are connected in series.

[0058] The amplifying and filtering circuit includes an amplifier U4 and an amplifier U5;

[0059] The positive input of amplifier U4 is connected to the cathode of voltage zener diode D8 through resistor R21, and the positive input of amplifier U4 is also grounded through a potentiometer, the reverse input of amplifier U4 is connected to the connection point of resistor R20 and thermistor, the output of amplifier U4 is connected to the reverse input of amplifier U5 through resistor R9, the positive input of amplifier U5 is grounded through resistor R10, the output of amplifier U5 is connected to the reverse input of amplifier U5 through resistor R11 and capacitor C11 connected in parallel, and the output of amplifier U5 is connected to the AD acquisition chip. Amplifier U5 actually constitutes a filtering circuit to ensure the output of high-quality signals.

[0060] In some embodiments, the control module is connected to a communication module; the application communicates with an external control platform; Figure 6 As shown, the communication module includes a wireless communication module and an RS485 module.

[0061] RS485 module includes 485 chip and RS485 communication interface;

[0062] The signal input end of the 485 chip is connected to the controller, the power end of the 485 chip is connected to the second power supply, and the output end of the 485 chip is connected to the RS485 communication interface.

[0063] In some embodiments, Figure 1As shown, the charging pile body has multiple charging sockets, and a temperature sensor is installed inside each charging socket. Each temperature sensor is connected to an amplifying and filtering circuit; all amplifying and filtering circuits are connected to a data acquisition circuit; the data acquisition circuit is connected to a controller; the controller includes a data processing module, and the data processing module of the controller mainly processes the received temperature data based on MCU and FPGA (field programmable gate array). The specific processing process is processed in an existing manner, and corresponding instructions are issued according to the results. The display module is installed in a conspicuous position of the charging pile body to display the temperature of each charging socket in real time. The alarm module is installed at the charging socket. When the controller detects that the temperature of a charging socket exceeds the preset alarm threshold, an audible and visual alarm signal is triggered. In addition, the display module can display the temperature of each charging socket in real time, which is convenient for users to understand the temperature during the charging process. Users can judge whether the charging process is normal by observing the temperature data on the display module, thereby increasing their trust in charging safety.

[0064] The embodiment of the utility model also provides a charging pile with temperature monitoring and emergency power-off functions, including the temperature monitoring and emergency power-off system as described in the above embodiment.

[0065] Although the present invention is described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person skilled in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions shall be within the scope of the present invention. Any person skilled in the art who is familiar with the present technical field may easily think of changes or substitutions within the technical scope disclosed in the present invention, and these shall be within the scope of protection of the present invention.

Claims

1. A charging pile temperature monitoring and emergency power-off system, wherein a circuit system is arranged in the charging pile body; a charging pile power supply interface and a charging socket are arranged on the charging pile body, and the circuit system is connected to the charging socket, characterized in that: The charging pile power supply interface is connected to the circuit system through a switch circuit; a temperature sensor is arranged in the charging socket or at a position away from the setting threshold of the charging socket, and the temperature sensor is connected to the controller through a data acquisition and processing module; the controller is connected to an alarm module; and the controller is connected to the switch circuit; The data acquisition processing module includes an amplifying and filtering circuit and a data acquisition circuit; the temperature sensor is connected to the amplifying and filtering circuit; the amplifying and filtering circuit is connected to the data acquisition circuit; the data acquisition circuit is connected to the controller; The switching circuit includes a bidirectional thyristor and a transistor Q3. The first anode end of the bidirectional thyristor is connected to the live wire end of the charging pile power supply interface, the second anode end of the bidirectional thyristor is connected to the live wire end of the circuit system, the neutral wire end of the circuit system is connected to the neutral wire end of the charging pile power supply interface, the gate end of the bidirectional thyristor is connected to the collector of the transistor Q3 through a resistor R22, the emitter of the transistor Q3 is grounded, and the base of the transistor Q3 is connected to the controller through a resistor R23.

2. The charging pile temperature monitoring and emergency power-off system according to claim 1, characterized in that: A power supply module is also provided in the charging pile body; The power supply module includes an AC-DC conversion circuit and a DC conversion circuit; The input end of the AC / DC conversion circuit is connected to the charging pile power supply interface, the output end of the AC / DC conversion circuit is connected to the input end of the DC conversion circuit, and the output end of the DC conversion circuit is respectively connected to the data acquisition and processing module, the controller, the alarm module and the switch circuit.

3. The charging pile temperature monitoring and emergency power-off system according to claim 2, characterized in that: The AC-DC conversion circuit includes a transformer, a rectifier bridge and a relay; the high-voltage side of the transformer is connected to the charging pile power supply interface, and the low-voltage side of the transformer is provided with a first terminal, an intermediate terminal and a second terminal, the first terminal is connected to the normally closed contact of the relay, the intermediate terminal is connected to the normally open contact of the relay, the second terminal is connected to an input end of the rectifier bridge, the common end of the relay is connected to the other input end of the rectifier bridge, the output end of the rectifier bridge outputs the first power supply to one end of the relay coil, the other end of the relay coil is connected to the collector of the transistor Q1, and the two ends of the relay coil are connected in parallel with a diode D5; The output end of the rectifier bridge is also connected to a comparator U1, the positive input end of the comparator U1 is connected to a reference voltage, the negative input end of the comparator U1 is connected to the output end of the rectifier bridge through a resistor R4 and a resistor R5 connected in series, the negative input end of the comparator U1 is also connected to ground through a resistor R6 and a resistor R7 connected in series, the negative input end of the comparator U1 is also connected to ground through a capacitor C2, the output end of the comparator U1 is also connected to the positive input end of the comparator U1 through a resistor R2, the output end of the comparator U1 is connected to the base of the transistor Q1 through a resistor R1, and the base of the transistor Q1 is also grounded through a capacitor C1.

4. The charging pile temperature monitoring and emergency power-off system according to claim 3, characterized in that: The DC conversion circuit includes a Schottky diode and a voltage conversion chip; The input end of the Schottky diode is connected to the output end of the rectifier bridge, the output end of the Schottky diode is grounded through capacitors C3 and C4 connected in parallel, the input end of the Schottky diode is also grounded through diode D6, the output end of the Schottky diode is connected to the input end of the voltage conversion chip, the output end of the voltage conversion chip outputs the second power supply through inductor L1, the first end of the inductor is grounded through a voltage regulator tube D7, the second end of the inductor L1 is connected to the feedback end of the voltage conversion chip, and the second end of the inductor L1 is also grounded through capacitors C5, C6 and C7 connected in parallel.

5. The charging pile temperature monitoring and emergency power-off system according to claim 4, characterized in that: The output end of the power supply module is connected to an amplifying and filtering circuit via a voltage stabilizing and conditioning circuit; The data acquisition circuit includes an AD acquisition chip; The output end of the amplifying and filtering circuit is connected to the AD acquisition chip.

6. The charging pile temperature monitoring and emergency power-off system according to claim 5, characterized in that: The temperature sensor adopts a thermistor, and the voltage regulating circuit includes a voltage stabilizing diode D8. The two ends of the voltage stabilizing diode D8 are connected in parallel with a resistor R17 and a resistor R18 which are connected in series. The connection point of the resistor R17 and the resistor R18 is connected to the middle end of the voltage stabilizing diode D8. The anode of the voltage stabilizing diode D8 is grounded, and the second power supply is connected to the cathode of the voltage stabilizing diode D8 through the resistor R16. The two ends of the voltage stabilizing diode D8 are also connected in parallel with a resistor R19, a resistor R20 and a thermistor which are connected in series.

7. The charging pile temperature monitoring and emergency power-off system according to claim 6, characterized in that: The amplifying and filtering circuit includes an amplifier U4 and an amplifier U5; The positive input terminal of the amplifier U4 is connected to the cathode of the voltage-regulating diode D8 through the resistor R21, and the positive input terminal of the amplifier U4 is also grounded through the potentiometer. The reverse input terminal of the amplifier U4 is connected to the connection point of the resistor R20 and the thermistor. The output terminal of the amplifier U4 is connected to the reverse input terminal of the amplifier U5 through the resistor R9. The positive input terminal of the amplifier U5 is grounded through the resistor R10. The output terminal of the amplifier U5 is connected to the reverse input terminal of the amplifier U5 through the resistor R11 and the capacitor C11 connected in parallel, and the output terminal of the amplifier U5 is connected to the AD acquisition chip.

8. The charging pile temperature monitoring and emergency power-off system according to any one of claims 3 to 7, characterized in that: The control module is connected with a communication module; The communication module includes a wireless communication module and an RS485 module.

9. The charging pile temperature monitoring and emergency power-off system according to claim 8, characterized in that: RS485 module includes 485 chip and RS485 communication interface; The signal input end of the 485 chip is connected to the controller, the power end of the 485 chip is connected to the second power supply, and the output end of the 485 chip is connected to the RS485 communication interface.

10. A charging pile with temperature monitoring and emergency power-off functions, characterized in that: It comprises the temperature monitoring and emergency power-off system as described in any one of claims 1 to 9.

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