TW202021835A - Charging device for electric vehicle - Google Patents

Abstract

A charging device for electric vehicle is provided and includes a power plug, a charging gun, a control box, a temperature detecting circuit and a temperature protection circuit. The charging gun is detachably connected with the electric vehicle and includes a connection confirming terminal and a connection confirming circuit. The connection confirming circuit is configured to output a connection confirming signal to the connection confirming terminal. The connection confirming signal includes a first voltage level and a second voltage level. The control box includes a second control unit. The temperature detecting circuit detects the temperature of the power plug or the temperature of the control box and output a corresponding temperature signal to the second control unit when the temperature of the power plug or the temperature of the control box exceeds over a predetermined temperature level. The temperature protection circuit is connected between the second control unit and the connection confirming terminal. When the second control unit receives the corresponding temperature signal, the temperature protection circuit adjusts the voltage level of the connection confirming terminal.

Description

Charging equipment for electric vehicles

This case is about a charging equipment for electric vehicles, especially a charging equipment for electric vehicles with over-temperature protection.

Recently, with the improvement of environmental awareness, how to develop an electric vehicle driven by electricity to replace traditional vehicles driven by fossil fuels has gradually become an important goal of the automotive industry.

Furthermore, in order to conveniently provide the electric power required for electric vehicles, electric vehicle charging equipment that can be applied to homes or workplaces using commercial AC power has been developed. Taking household charging equipment as an example, when the battery of an electric vehicle needs to be charged through a commercial AC power outlet, the electric vehicle must be connected to the commercial AC power source through a charging device. The charging device includes a power plug that can be electrically connected to the power socket of a commercial AC power source, and a charging gun that is electrically connected to the car port of the electric vehicle. When the battery of the electric vehicle is charged, the power plug of the charging device is inserted into the power socket at home.

However, in order to shorten the charging time, electric vehicles often need to receive a large current through the charging device for charging, and such a long time will cause the temperature of the charging device to gradually increase. Furthermore, if the power plug is not properly connected to the power socket of the commercial AC power supply, it will also cause abnormal heating, which will lead to leakage. Based on the above two problems, the temperature of the charging device is often too high, and this high temperature will cause the charging device to be easily damaged or even burned.

Therefore, how to provide a charging device for electric vehicles with over-temperature protection is an urgent problem in the field.

The purpose of this case is to provide a charging device for electric vehicles that has an over-temperature protection function, which can notify the electric vehicle of abnormal temperature when the temperature of the power plug of the charging device or the control box is too high, and stop or reduce the charging current , To avoid the temperature continue to rise and cause damage to the components or circuits. Moreover, the signal transmission of the over-temperature protection function does not affect the detection and judgment of electric vehicle charging information, and no additional wiring is required.

In order to achieve the aforementioned purpose, this case provides a charging device for electric vehicles, which is constructed to charge electric vehicles. The electric vehicle includes a first control unit. The charging equipment includes a power plug, a charging gun, a control box, a temperature detection circuit and a temperature protection circuit. The power plug is for receiving AC power from a commercial AC power source. The charging gun is connected to the power plug through the charging cable, and is detachably connected to the electric vehicle, and includes a connection confirmation terminal and a connection confirmation circuit. The connection confirmation circuit is used to output a connection confirmation signal to the connection confirmation terminal. When the connection between the charging gun and the electric vehicle is in a normal state, the connection confirmation signal has the first voltage level, and the connection between the charging gun and the electric vehicle is abnormal In the state, the connection confirmation signal has the second voltage level. The control box is connected between the power plug and the charging gun, and is constructed to selectively transmit the alternating current received by the power plug to the charging gun, and includes a second control unit. The temperature detection circuit is electrically connected to the second control unit to detect the temperature of the power plug or the control box, and output a corresponding temperature signal when the temperature of the power plug or the control box exceeds a predetermined temperature level. The temperature protection circuit is electrically connected between the second control unit and the connection confirmation terminal, and the second control unit drives the temperature protection circuit to adjust the voltage level on the connection confirmation terminal according to the corresponding temperature signal.

In order to achieve the aforementioned purpose, this case also provides a charging device for electric vehicles, which is constructed to charge electric vehicles. The electric vehicle includes a first control unit and a first wireless transmission module, and the first control unit is connected with the first wireless transmission module. The charging equipment includes a power plug, a charging gun, a control box, a temperature detection circuit and a temperature protection circuit. The power plug is for receiving AC power from a commercial AC power source. The charging gun is connected to the power plug through the charging cable, and is detachably connected to the electric vehicle. The control box is connected between the power plug and the charging gun, and is constructed to selectively transmit the alternating current received by the power plug to the charging gun, and includes a second control unit. The temperature detection circuit is electrically connected to the second control unit to detect the temperature of the power plug or the control box, and output a corresponding temperature signal when the temperature of the power plug or the control box exceeds a predetermined temperature level. The temperature protection circuit is electrically connected to the second control unit. The temperature protection circuit includes a second wireless transmission module. When the second control unit receives the corresponding temperature signal, the second control unit drives the second wireless transmission module of the temperature protection circuit. The group outputs wireless signals to the first wireless transmission module of the electric vehicle, and when the first control unit of the electric vehicle receives the wireless signal through the first wireless transmission module, a protection mechanism is implemented.

Some typical embodiments embodying the features and advantages of this case will be described in detail in the description in the following paragraphs. It should be understood that the case can have various changes in different aspects, which do not depart from the scope of the case, and the descriptions and drawings therein are essentially for the purpose of illustration, rather than limiting the case.

In this document, the term "coupling" can be referred to as "electric coupling", and the term "connection" can also be referred to as "electrical connection". The so-called "coupled" and "connected" can be used to indicate that two or more elements cooperate or interact with each other. It is understandable that although terms such as "first" and "second" are used to describe various elements in this document, these elements are not limited by these terms. These terms are only used to distinguish one element from another element. For example, without departing from the scope of the embodiment, the first element can also be referred to as the second element, and similarly, the second element can also be referred to as the first element.

Fig. 1 is a schematic diagram showing the circuit structure of the electric vehicle charging equipment according to the first embodiment of the present invention. Figure 2 is a schematic diagram showing the detailed circuit structure of the temperature protection circuit shown in Figure 1. As shown in Fig. 1 and Fig. 2, the specifications of the charging device 1 of this embodiment are in compliance with European regulations, American regulations and/or international regulations. The charging device 1 is detachably connected between a power socket (not shown) of a commercial AC power source at home and an electric vehicle 9, wherein the electric vehicle 9 includes an on-board charging unit 90 and a first control unit 91. The on-board charging unit 90 may include, for example, but not limited to, a battery and a charger for charging the battery. The first control unit 91 is configured to control the charging operation of the electric vehicle 9. The charging device 1 is configured to receive AC power from a commercial AC power outlet and charge the electric vehicle 9, and includes a power plug 2, a control box 4, a charging cable 5 and a charging gun 6. Among them, the power plug 2 is detachably inserted into the power socket of the commercial AC power source to receive the AC power of the commercial AC power source. The control box 4 is connected between the power plug 2 and the charging line 5, and is configured to selectively transmit the alternating current received by the power plug 2 to the charging line 5. The control box 4 can notify the first control unit 91 of the current charging device 1 The power supply capability enables the first control unit 91 to control the maximum allowable input current of the on-board charging unit 90. Furthermore, the control box 4 includes a second control unit 40, which is configured to perform the operation of the control box 4 Control, the second control unit 40 and the first control unit 91 of the electric vehicle 9 can communicate with each other through the charging cable 5 and the charging gun 6.

In this embodiment, the charging wire 5 is connected between the control box 4 and the charging gun 6, and includes a live wire L, a neutral wire N, and a protective ground wire PE. The live wire L, the neutral wire N, and the protective earth wire PE each include a first end and a second end. Among them, the first end of the live wire L, the neutral wire N and the protective earth wire PE are connected to each other via the control box 4 The power plug 2 is connected, and the second end of the live wire L, the neutral wire N and the protective earth wire PE are respectively connected to the charging gun 6.

In this embodiment, the charging gun 6 is connected to the power plug 2 through the control box 4 and the charging cable 5, and is structured so that the AC power of the commercial AC power source is transmitted to the power plug 2, the control box 4, and the charging cable 5. Electric car 9. In this way, when the charging gun 6 is connected to the electric vehicle 9, the charging gun 6 can charge the electric vehicle 9. The charging gun 6 includes a plurality of terminals corresponding to the sockets (not shown) of the electric vehicle 9 so that the charging gun 6 and the electric vehicle 9 can be electrically coupled to each other. For example, in the embodiment shown in FIG. 1, the charging gun 6 includes a plurality of charging terminals L1, N1, a ground terminal PE1, a control guide terminal CP, and a connection confirmation terminal CC.

When the charging gun 6 is connected to the electric vehicle 9, the charging terminals L1 and N1 are electrically coupled to the on-board charging unit 90 of the electric vehicle 9 through corresponding terminals on the socket of the electric vehicle 9, thereby charging the electric vehicle 9. In addition, the ground terminal PE1 can be electrically coupled to the first ground terminal (not shown) in the charging device 1 and/or the second ground terminal G of the electric vehicle 9.

The connection confirmation terminal CC of the charging gun 6 is configured to be electrically coupled to the electric vehicle 9, and the first control unit 91 of the electric vehicle 9 senses that the connection between the charging gun 6 and the electric vehicle 9 is normal (that is, the charging gun 6 is connected to the socket of the electric car 9 and correctly connected to it) or in an abnormal connection state (that is, the charging gun 6 will be pulled out and disconnected from the socket of the electric car 9 or is not correctly connected to the socket of the electric car 9 ) To immediately stop charging or close the conductive path when necessary to avoid accidents.

The control guide terminal CP is connected to the second control unit 40 of the control box 4 and the first control unit 91 of the electric vehicle 9, and the control guide terminal CP is used to transmit the control guide between the charging gun 6 and the electric vehicle 9 The signal Vcp enables the second control unit 40 of the control box 4 and the first control unit 91 of the electric vehicle 9 to detect charging information based on the voltage level and duty cycle of the control pilot signal Vcp, such as whether the charging preparation is complete , The current amount of current that can be supplied by the charging device 1 and whether the charging procedure is completed. Since the operating principles of the control pilot terminal CP and the control pilot signal Vcp are well known to those with ordinary knowledge in the art, they will not be repeated here.

In this embodiment, the charging gun 6 further includes a connection confirmation circuit 60. The connection confirmation circuit 60 is electrically coupled between the connection confirmation terminal CC and the ground terminal PE1, and is used to output a connection confirmation signal Vcc to the first of the electric vehicle 9. A control unit 91 is used to confirm the connection state between the charging gun 6 and the electric vehicle 9. The connection confirmation circuit 60 includes a plurality of resistance units and a switch unit S1, wherein the plurality of resistance units includes, for example, a first resistance unit R1 and a second resistance unit R2. The first resistance unit R1 and the switch unit S1 are electrically coupled in parallel, and then electrically coupled in series with the second electrical group unit R2. The switch unit S1 may be a normally closed switch, that is, the first resistance unit R1 is bypassed when it is turned on in a normal state, so that the voltage level of the connection confirmation signal Vcc can maintain the first voltage level. When the first control unit 91 of the electric vehicle 9 receives the connection confirmation signal Vcc with the first voltage level from the connection confirmation terminal CC, the first control unit 91 of the electric vehicle 9 executes the corresponding control program. When the charging gun 6 is about to detach from the socket of the electric vehicle 9, or the charging gun 6 is not correctly connected to the socket of the electric vehicle 9, that is, when the connection is abnormal, the switch unit S1 is correspondingly disconnected, so that the connection confirmation circuit 60 The overall resistance value of is changed, so that the voltage level of the connection confirmation signal Vcc is changed to the second voltage level, wherein the switch unit S1 can be disconnected, for example, according to the separation of the mechanism fixing member. Thereby, the first control unit 91 of the electric vehicle 9 can implement a protection mechanism when receiving the connection confirmation signal Vcc with the second voltage level. In this embodiment, the protection mechanism can, for example, but not limited to, notify the control box 4 to stop transmitting AC power and/or reduce the current demand of the electric vehicle 9, prompting the control box 4 to derate the AC power received by the power plug 2 and output the Derated AC power to ensure user safety.

In this embodiment, the charging device 1 further includes a temperature detection circuit 3 and a temperature protection circuit 41. The temperature protection circuit 41 can be placed in the control box 4 or the charging gun 6. The figure shown here is placed in the control box 4. As an example. The temperature detection circuit 3 can be installed in the power plug 2 as shown in Figure 1, or in the control box 4 (not shown). The temperature detection circuit 3 is connected to the second control unit 40 and is used to detect the temperature of the power plug 2 or the control box 4 when the charging device 1 is charging the electric vehicle 9. When the temperature of the power plug 2 or the control box 4 exceeds a predetermined temperature level, the temperature detection circuit 3 correspondingly outputs a corresponding temperature signal to the second control unit 40.

The temperature protection circuit 41 is connected between the second control unit 40 of the control box 4 and the connection confirmation terminal CC, and includes a switch circuit 410. The switch circuit 410 is connected to the voltage source Vs, the second control unit 40 and the connection confirmation terminal CC. The voltage level of the voltage source Vs may be a third voltage level that is equal to or similar to the second voltage level of the connection confirmation signal Vcc, and is mainly different from the first voltage level. The switch circuit 410 is controlled by the second control unit 40 to turn on or turn off the path between the voltage source Vs and the connection confirmation terminal CC. If the temperature detection circuit 3 does not detect over-temperature, that is, no over-temperature signal is output or the temperature signal output to the second control unit 40 does not exceed the predetermined value, the second control unit 40 controls the switch circuit 410 to turn off the voltage source The path between Vs and the connection confirmation terminal CC prevents the voltage of the voltage source Vs from being transmitted to the connection confirmation terminal CC. At this time, the confirmation terminal CC is used to determine whether the connection between the charging gun 6 and the electric vehicle 9 is normal according to the original setting. However, if the temperature of the power plug 2 or the control box 4 exceeds the predetermined temperature level, the second control unit 40 controls the switch circuit 410 to turn on the path between the voltage source Vs and the connection confirmation terminal CC, so that the phase provided by the voltage source Vs The voltage different from the first voltage level is transmitted to the connection confirmation terminal CC. At this time, the first control unit 91 of the electric vehicle 9 will regard the voltage provided by the voltage source Vs as different from the first voltage level as Connect the confirmation signal Vcc and execute the protection mechanism. For example, if the voltage level of the voltage source Vs can be equal to the second voltage level of the connection confirmation signal Vcc, the first control unit 91 will determine that the connection between the charging gun 6 and the electric vehicle 9 is abnormal, and then execute the corresponding protection program. In this way, the purpose of over-temperature protection can be achieved; or the voltage level of the voltage source Vs can be any third voltage level to notify the first control unit 91 that the current state is abnormal, and then execute the corresponding protection program.

It can be seen from the above that the charging device 1 includes a temperature detection circuit 3 and a temperature protection circuit 41, and the temperature protection circuit 41 transmits a voltage different from the first voltage level provided by the voltage source Vs to the connection confirmation terminal CC. The first control unit 91 of the electric vehicle 9 enables the first control unit 91 to execute the corresponding protection mechanism when the temperature detection circuit 3 detects that the temperature of the power plug 2 or the control box 4 exceeds a predetermined temperature level. Therefore, This case can prevent the components or circuits of the charging device 1 from burning down at high temperatures and ensure the safety of users. Furthermore, since the output of the temperature protection circuit 41 is only transmitted to the electric vehicle 9 through the connection confirmation terminal CC, the output of the temperature protection circuit 41 does not affect the control pilot signal Vcp of the control pilot terminal CP. The control pilot signal Vcp of the terminal CP can still be accurately transmitted by the charging device 1 to the first control unit 91 of the electric vehicle 9 without being disturbed by the temperature protection circuit 41 and the like.

In some embodiments, the control box 4 further includes a plurality of relays, such as a first relay K1 and a second relay K2. The first relay K1 is connected between the power plug 2 and the live wire L, and the second relay K2 is connected between the power plug 2 and the neutral wire N. The first relay K1 and the second relay K2 can be controlled by the second control unit 40 of the control box 4. When the charging device 1 charges the electric vehicle 9, the first relay K1 and the second relay K2 are controlled by the second control unit 40 of the control box 4 to be turned on. However, when the first control unit 91 of the electric vehicle 9 informs the control box 4 to stop transmitting AC power to the electric vehicle 9, the first relay K1 and the second relay K2 are controlled by the second control unit 40 of the control box 4 and turned off.

In some embodiments, as shown in FIG. 2, the switch circuit 410 includes a third resistance unit R3, a fourth resistance unit R4, a diode D, and a PNP type transistor B. One end of the third resistance unit R3 is connected to the voltage source Vs and the emitter of the PNP type transistor B, and the other end of the third resistance unit R3 is connected to one end of the fourth resistance unit R4 and the PNP type transistor The base of B is connected. The other end of the fourth resistance unit R4 is connected to the second control unit 40. The collector of the PNP transistor B is connected to the anode of the diode D. The cathode of the diode D is connected to the connection confirmation terminal CC. However, the circuit structure of the switch circuit 410 is not limited to the above, as long as the circuit can be used to adjust the voltage level on the connection confirmation terminal CC. In some embodiments, the switching circuit 410 of the temperature protection circuit 41 may include a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) or an insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT). ) To replace the PNP type transistor B, and further have different implementations.

FIG. 3 is a schematic diagram showing the circuit structure of the electric vehicle charging equipment of the second embodiment of the present invention. As shown in Figure 3, the charging device 1'is detachably connected between the power socket (not shown) of the commercial AC power supply at home and the electric vehicle 9 and includes a power plug 2, a temperature detection circuit 3, and a control box 4', the charging cable 5 and the charging gun 6, wherein the power plug 2, the temperature detection circuit 3, the charging cable 5, the second control unit 40 of the control box 4', and the charging gun 6 shown in Fig. 3 are all the same as the first The power plug 2, the temperature detection circuit 3, the charging cable 5, the second control unit 40 of the control box 4', and the charging gun 6 shown in the figure are similar, so they will not be repeated here. Compared with the first embodiment shown in Figure 1, the temperature protection circuit 41' of the control box 4'shown in Figure 3 includes a second wireless transmission module 410'. For example, but not limited to, a Bluetooth transmission module, which is connected to the second control unit 40 of the control box 4'. In addition, the electric vehicle 9 further includes a first wireless transmission module 92. For example, but not limited to, a Bluetooth transmission module, which is connected to the first control unit 91 of the electric vehicle 9. In this embodiment, the second wireless transmission module 410' and the first wireless transmission module 92 can communicate with each other in a wireless manner.

When the temperature detection circuit 3 detects that the temperature of the power plug 2 or the control box 4'exceeds a predetermined temperature level, it outputs a corresponding temperature signal to the second control unit 40, and the second control unit 40 drives the second wireless transmission module 410 'Output wireless signals to the first wireless transmission module 92. Then, the first control unit 91 of the electric vehicle 9 receives the wireless signal via the first wireless transmission module 92, and then executes the protection mechanism. In this embodiment, the protection mechanism can, for example, but not limited to, notify the control box 4'to stop transmitting AC power and/or reduce the current demand of the electric vehicle 9, prompting the control box 4'to derate the AC power received by the power plug 2 and output the Derated AC power to ensure the safety of use.

It can be seen from the above that since the charging device 1'includes a temperature detection circuit 3 and a temperature protection circuit 41', and the second control unit 40 of the control box 4'and the first control unit 91 of the electric vehicle 9 can be used in the temperature detection circuit 3 When it is detected that the temperature of the power plug 2 or the control box 4'exceeds the predetermined temperature level, the second wireless transmission module 410' and the first wireless transmission module 92 communicate wirelessly with each other. Therefore, this case can prevent the charging device 1'from being damaged. Components or circuits burn out at high temperatures and ensure the safety of use. Furthermore, when the charging cable 5 is damaged by the structure of the electric vehicle 9, the second control unit 40 of the control box 4'and the first control unit 91 of the electric vehicle 9 can still pass through the second wireless transmission module 410 'And the first wireless transmission module 92 communicate with each other wirelessly, so the over-temperature protection function of the charging device 1'will not easily fail.

This case can be modified in many ways by those who are familiar with this technology, but it is not deviated from the protection of the scope of the patent application.

1. 1’: Charging equipment 2: power plug 3: Temperature detection circuit 4. 4’: Control box 40: second control unit 41, 41’: Temperature protection circuit 410: switch circuit 410’: The second wireless transmission module 5: Charging cable 6: Charging gun 60: Connection confirmation circuit 9: Electric car 90: On-board charging unit 91: The first control unit 92: The first wireless transmission module B: PNP type transistor CC: Connection confirmation terminal CP: Control guide terminal D: Diode G: Ground terminal K1: The first relay K2: second relay L: FireWire L1, N1: charging terminal N: midline PE: Protective ground PE1: Ground terminal R1: The first resistance unit R2: second resistance unit R3: The third resistance unit R4: The fourth resistance unit S1: Switch unit Vcc: connection confirmation signal Vcp: control pilot signal Vs: voltage source

Fig. 1 is a schematic diagram showing the circuit structure of the electric vehicle charging equipment according to the first embodiment of the present invention.

Figure 2 is a schematic diagram showing the detailed circuit structure of the temperature protection circuit shown in Figure 1.

FIG. 3 is a schematic diagram showing the circuit structure of the electric vehicle charging equipment of the second embodiment of the present invention.

1: charging equipment

2: power plug

3: Temperature detection circuit

4: control box

40: second control unit

41: temperature protection circuit

410: switch circuit

5: Charging cable

6: Charging gun

60: Connection confirmation circuit

9: Electric car

90: On-board charging unit

91: The first control unit

CC: Connection confirmation terminal

CP: Control guide terminal

G: Ground terminal

K1: The first relay

K2: second relay

L: FireWire

L1, N1: charging terminal

N: midline

PE: Protective ground

PE1: Ground terminal

R1: The first resistance unit

R2: second resistance unit

S1: Switch unit

Vcc: connection confirmation signal

Vcp: control pilot signal

Vs: voltage source

Claims (10)

A charging device is configured to charge an electric vehicle, the electric vehicle includes a first control unit, and the charging device includes: A power plug, which receives AC power from a commercial AC power supply; A charging gun is connected to the power plug through a charging cable and is detachably connected to the electric vehicle, and includes a connection confirmation terminal and a connection confirmation circuit for outputting a connection confirmation signal to The connection confirmation terminal, wherein when the connection between the charging gun and the electric vehicle is in a normal connection state, the connection confirmation signal has a first voltage level, and the connection between the charging gun and the electric vehicle is in an abnormal connection state When, the connection confirmation signal has a second voltage level; A control box, connected between the power plug and the charging gun, configured to selectively transmit the alternating current received by the power plug to the charging gun, and including a second control unit; A temperature detection circuit electrically connected to the second control unit for detecting the temperature of the power plug or the control box, and when the temperature of the power plug or the control box exceeds a predetermined temperature level, output a corresponding Temperature signal; and A temperature protection circuit is electrically connected between the second control unit and the connection confirmation terminal, wherein the second control unit drives the temperature protection circuit to adjust the voltage level on the connection confirmation terminal according to the corresponding temperature signal. The charging device according to claim 1, wherein the temperature protection circuit includes a switch circuit, the switch circuit is connected to a voltage source, and the second control unit is connected to the connection confirmation terminal, wherein the switch circuit is connected to the corresponding temperature signal Selectively connect the voltage source to the connection confirmation terminal. The charging device according to claim 2, wherein the switch circuit includes a third resistance unit, a fourth resistance unit, a diode, and a PNP type transistor, and one end of the third resistance unit is connected to the voltage The source and the emitter of the PNP type transistor are connected, the other end of the third resistance unit is connected to one end of the fourth resistance unit and the base of the PNP type transistor, and the other end of the fourth resistance unit The point is connected with the second control unit, the collector of the PNP transistor is connected with the anode of the diode, and the cathode of the diode is connected with the charging gun. The charging device according to claim 1, wherein the connection confirmation circuit includes a first resistance unit, a second resistance unit, and a switch unit, the switch unit is connected in parallel with the first resistance unit, the switch unit and the first The resistance unit is connected in series with the second resistance unit. When the switch unit is turned on, the voltage level of the connection confirmation signal maintains the first voltage level, and when the switch unit is turned off, the voltage level of the connection confirmation signal maintains the first voltage level. The second voltage level. The charging device according to claim 1, wherein when the first control unit receives the connection confirmation signal with the second voltage level via the connection confirmation terminal, it notifies the control box to stop transmitting AC power. The charging device according to claim 1, wherein the second control unit drives the temperature protection circuit to adjust the voltage level on the connection confirmation terminal to the second voltage level or a third voltage level according to the corresponding temperature signal Bit. The charging device according to claim 1, wherein the abnormal connection state means that the charging gun is not correctly connected to the electric vehicle. A charging device is configured to charge an electric vehicle. The electric vehicle includes a first control unit and a first wireless transmission module, and the first control unit is connected to the first wireless transmission module. The charging device contain: A power plug, which receives AC power from a commercial AC power supply; A charging gun is connected to the power plug through a charging cable, and is detachably connected to the electric vehicle; A control box, connected between the power plug and the charging gun, configured to selectively transmit the alternating current received by the power plug to the charging gun, and including a second control unit; A temperature detection circuit electrically connected to the second control unit for detecting the temperature of the power plug or the control box, and when the temperature of the power plug or the control box exceeds a predetermined temperature level, output a corresponding Temperature signal; and A temperature protection circuit is electrically connected to the second control unit. The temperature protection circuit includes a second wireless transmission module. When the second control unit receives the corresponding temperature signal, the second control unit drives the The second wireless transmission module of the temperature protection circuit outputs a wireless signal to the first wireless transmission module of the electric vehicle, and the first control unit of the electric vehicle receives the wireless signal through the first wireless transmission module When, a protection mechanism is implemented. The charging device according to claim 8, wherein the protection mechanism is to notify the control box to stop transmitting AC power and/or reduce the current demand of the electric vehicle. The charging device according to claim 8, wherein the first wireless transmission module and the second wireless transmission module are both Bluetooth transmission modules.

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