CN111284340A - Charging device for electric vehicle - Google Patents

Abstract

The utility model provides a battery charging outfit of electric motor car, contains power plug, the rifle that charges, control box, temperature detection circuit and temperature protection circuit. The charging gun is detachably connected to the electric vehicle and includes a connection confirmation terminal and a connection confirmation circuit. The connection confirmation circuit is used for outputting a connection confirmation signal to the connection confirmation terminal. The connection confirmation signal includes at least a first voltage level and a second voltage level. The control box comprises a second control unit. The temperature detection circuit detects the temperature of the power plug or the control box and outputs a corresponding temperature signal to the second control unit when the detected temperature exceeds a preset temperature level. The temperature protection circuit is electrically connected between the second control unit and the connection confirmation terminal. The temperature protection circuit adjusts the voltage level at the connection confirmation terminal when the second control unit receives the corresponding temperature signal.

Description

Charging equipment for electric vehicles

technical field

The present disclosure relates to a charging device for an electric vehicle, in particular to a charging device for an electric vehicle with an over-temperature protection function.

Background technique

Recently, with the improvement of environmental awareness, how to develop an electric-driven electric vehicle to replace the traditional means of transportation powered by fossil fuels has gradually become an important goal of the automobile industry.

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

However, in order to shorten the charging time, the electric vehicle often needs to receive a large current through the charging device for charging, and such a long time charging 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 heat, and thus cause leakage of electricity. Based on the above two problems, the temperature of the charging device is often too high, and the high temperature will cause the charging device to be easily damaged or even burned.

Therefore, how to provide a charging device for an electric vehicle with an over-temperature protection function is an urgent problem to be solved in the art.

SUMMARY OF THE INVENTION

The purpose of the present disclosure is to provide a charging device for an electric vehicle. The charging device has an over-temperature protection function, which can notify the electric vehicle of abnormal temperature and stop or reduce the charging when the temperature of the power plug or the control box of the charging device is too high. current to prevent the temperature from continuing to rise and cause damage to components or circuits. Moreover, the signal transmission of the over-temperature protection function does not affect the detection and judgment of the charging information of the electric vehicle, and additional wiring is not required.

In order to achieve the aforementioned objective, the present disclosure provides a charging device for an electric vehicle, which is configured to charge the electric vehicle. The electric vehicle includes a first control unit. The charging device includes a power plug, a charging gun, a control box, a temperature detection circuit, and a temperature protection circuit. A power plug is an AC that accepts commercial AC power. The 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. The connection confirmation circuit is used for outputting 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 a first voltage level, and the connection between the charging gun and the electric vehicle is abnormal. In the state, the connection confirmation signal has a second voltage level. The control box is connected between the power plug and the charging gun, is configured to selectively transmit the AC power 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 for detecting the temperature of the power plug or the control box, and outputs 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 objective, the present disclosure further provides a charging device for an electric vehicle, which is configured to charge the electric vehicle. 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 device includes a power plug, a charging gun, a control box, a temperature detection circuit, and a temperature protection circuit. A power plug is an AC that accepts commercial AC power. The charging gun is connected with the power plug through the charging cable, and is detachably connected with the electric vehicle. The control box is connected between the power plug and the charging gun, is configured to selectively transmit the AC power 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 for detecting the temperature of the power plug or the control box, and outputs 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, and the temperature protection circuit includes a second wireless transmission module. When the second control unit receives a corresponding temperature signal, the second control unit drives the output of the second wireless transmission module of the temperature protection circuit The wireless signal is sent to the first wireless transmission module of the electric vehicle, and the first control unit of the electric vehicle executes the protection mechanism when receiving the wireless signal through the first wireless transmission module.

Description of drawings

FIG. 1 is a schematic diagram of a circuit structure of a charging device for an electric vehicle according to a first embodiment of the disclosure.

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

FIG. 3 is a schematic diagram of a circuit structure of a charging device for an electric vehicle according to a second embodiment of the disclosure.

Description of reference numbers:

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 Vehicles

90: On-board charging unit

91: First control unit

92: The first wireless transmission module

B: PNP type transistor

CC: Connection confirmation terminal

CP: Control pilot terminal

D: Diode

G: ground terminal

K1: the first relay

K2: Second relay

L: FireWire

L1, N1: charging terminals

N: midline

PE: protective ground wire

PE1: ground terminal

R1: the first resistance unit

R2: The second resistance unit

R3: the third resistance unit

R4: Fourth resistance unit

S1: switch unit

Vcc: connection confirmation signal

Vcp: control pilot signal

Vs: voltage source

Detailed ways

Some typical embodiments that embody the features and advantages of the present disclosure will be described in detail in the description that follows. It should be understood that the present disclosure is capable of various changes in different embodiments without departing from the scope of the present disclosure, and the descriptions and drawings therein are for illustrative purposes only, not for limitation. this disclosure.

In this case, the term "coupled" may be referred to as "electrically coupled," and the term "connected" may also be referred to as "electrically connected." The terms "coupled" and "connected" may be used to indicate that two or more elements co-operate or interact with each other. It will be understood that, although the terms "first", "second" and the like are used in this document to describe various elements, such elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could also be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the embodiments.

FIG. 1 is a schematic diagram of a circuit structure of a charging device for an electric vehicle according to a first embodiment of the disclosure. FIG. 2 is a schematic diagram showing a detailed circuit structure of the temperature protection circuit shown in FIG. 1 . As shown in FIG. 1 and FIG. 2 , the specifications of the charging device 1 in this embodiment all conform to the standard specifications in 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 supply 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 constructed to receive AC power from a power socket of a commercial AC power source 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 . Wherein, 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 cable 5, and is configured to selectively transmit the AC power received by the power plug 2 to the charging cable 5. The control box 4 can notify the first control unit 91 of the current status of the 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, and the second control unit 40 is configured to control the operation of the control box 4. 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 ground wire PE all include a first terminal and a second terminal respectively, wherein the first terminal of the live wire L, the neutral wire N and the protective ground wire PE are respectively connected to the power plug 2 through the control box 4 , the second terminals of the live wire L, the neutral wire N and the protective ground wire PE are respectively connected to the charging gun 6 .

In this embodiment, the charging gun 6 is connected to the power plug 2 via the control box 4 and the charging cable 5 , and is constructed so that the alternating current of the commercial AC power source is transmitted to the electric power through the power plug 2 , the control box 4 and the charging cable 5 . car 9. Therefore, 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 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 vehicle-mounted charging unit 90 of the electric vehicle 9 via the corresponding terminals on the socket of the electric vehicle 9 , thereby charging the electric vehicle 9 . In addition, the ground terminal PE1 may 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 structured to be electrically coupled with the electric vehicle 9 and provide the first control unit 91 of the electric vehicle 9 to sense that the connection between the charging gun 6 and the electric vehicle 9 is in a normal state (that is, the charging gun 6 is connected to the electric vehicle 9 ). connected to the socket of the electric vehicle 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 vehicle 9 or not correctly connected to the socket of the electric vehicle 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 signal between the charging gun 6 and the electric vehicle 9 Vcp, so that the second control unit 40 of the control box 4 and the first control unit 91 of the electric vehicle 9 can detect the charging information according to the voltage level and duty cycle of the control pilot signal Vcp, such as whether the charging preparation is completed, the current The amount of current that can be supplied to 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 skilled in the art, they will not be described in detail 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 for outputting the connection confirmation signal Vcc to the first signal of the electric vehicle 9 . A control unit 91 , thereby confirming 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 include, for example, a first resistance unit R1 and a second resistance unit R2. The first resistance unit R1 is electrically coupled in parallel with the switch unit S1, and is then electrically coupled in series with the second electrical group unit R2. The switch unit S1 can be a normally closed switch, that is, the first resistor unit R1 is bypassed in a normal state, so that the voltage level of the connection confirmation signal Vcc can be maintained at the first voltage level. When the first control unit 91 of the electric vehicle 9 receives the connection confirmation signal Vcc having the first voltage level through the connection confirmation terminal CC, the first control unit 91 of the electric vehicle 9 executes the corresponding control procedure. When the charging gun 6 is about to be disconnected 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, the connection is abnormal, the switch unit S1 is correspondingly disconnected, so that the connection confirmation circuit 60 is disconnected. The overall resistance value of is changed, so that the voltage level of the connection confirmation signal Vcc is changed to a second voltage level, wherein the switch unit S1 can be turned off, eg, according to the separation of the mechanism fixing member. Therefore, the first control unit 91 of the electric vehicle 9 can execute a protection mechanism when receiving the connection confirmation signal Vcc having the second voltage level. In this embodiment, the protection mechanism can be, for example but not limited to, notify the control box 4 to stop transmitting the AC power and/or reduce the current demand of the electric vehicle 9, so that the control box 4 derates the AC power received by the power plug 2 and outputs 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 in the charging gun 6. The illustration here is placed in the control box 4 only. An example. The temperature detection circuit 3 can be arranged in the power plug 2 as shown in FIG. 1 , or arranged in the control box 4 (not shown). The temperature detection circuit 3 is connected to the second control unit 40 and used to detect the temperature of the power plug 2 or the control box 4 when the charging device 1 charges 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 outputs a corresponding temperature signal to the second control unit 40 accordingly.

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 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, the over-temperature signal is not output or the temperature signal output to the second control unit 40 does not exceed a predetermined value, the second control unit 40 controls the switch circuit 410 to turn off the voltage source Vs and The path between the connection confirmation terminals 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 judge 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 a predetermined temperature level, the second control unit 40 controls the switch circuit 410 to conduct the path between the voltage source Vs and the connection confirmation terminal CC, so that the voltage provided by the voltage source Vs A 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 different from the first voltage level provided by the voltage source Vs as a The signal Vcc is confirmed for the connection, and the protection mechanism is implemented. 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, so as to notify the first control unit 91 that the current state is abnormal, and then execute a corresponding protection program.

As can be seen from the above, the charging device 1 includes the temperature detection circuit 3 and the temperature protection circuit 41, and the temperature protection circuit 41 transmits the voltage provided by the voltage source Vs, which is different from the first voltage level, to the electric motor through the connection confirmation terminal CC. The first control unit 91 of the car 9, so that the first control unit 91 can 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, the present disclosure can The components or circuits of the charging apparatus 1 are prevented from being burned at high temperature and the safety of the user is ensured. 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, so the control pilot 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 notifies the control box 4 to stop transmitting the alternating current 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 to be 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 transistor B. One end of the third resistance unit R3 is connected to the voltage source Vs and the emitter of the PNP 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 base of the PNP transistor B connect. 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 switch circuit 410 of the temperature protection circuit 41 may include a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) or an Insulated Gate Bipolar Transistor (IGBT). Instead of the PNP-type transistor B, there are different implementations.

3 discloses a schematic diagram of a circuit structure of a charging device for an electric vehicle according to a second embodiment of the present disclosure. As shown in FIG. 3 , the charging device 1 ′ is detachably connected between a power socket (not shown) of a commercial AC power supply at home and an 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 power supply shown in FIG. 1 The 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 are similar, so they are not repeated here. Compared with the first embodiment shown in FIG. 1 , the temperature protection circuit 41' of the control box 4' shown in FIG. 3 includes a second wireless transmission module 410'. For example but not limited to a Bluetooth transmission module, which is connected with 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. The second control unit 40 drives the second wireless transmission module 410' to output wireless signal to the first wireless transmission module 92 . Next, 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 be, for example but not limited to, notify the control box 4' to stop transmitting the AC power and/or reduce the current demand of the electric vehicle 9, so that the control box 4' derates the AC power received by the power plug 2 and outputs the Derating the AC power to ensure the safety of use.

As can be seen from the above, since the charging device 1 ′ includes the temperature detection circuit 3 and the 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 detected in the temperature detection circuit 3 When the temperature of the power plug 2 or the control box 4' exceeds a predetermined temperature level, the second wireless transmission module 410' and the first wireless transmission module 92 communicate wirelessly with each other. Therefore, the present disclosure can prevent the components or circuits of the charging device 1' from being damaged. Burn out at high temperature and ensure the safety of use. Furthermore, when the charging cable 5 is damaged by being crushed 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 to communicate wirelessly with each other, so the over-temperature protection function of the charging device 1 ′ will not fail easily.

Various modifications and variations of the present disclosure may be made by those skilled in the art without departing from the scope of the appended claims.

Claims (10)

1. A charging device configured to charge an electric vehicle, the electric vehicle comprising a first control unit, the charging device comprising: a power plug for receiving AC power from a commercial AC power source; a charging gun connected to the power plug through a charging cable and detachably connected to the electric vehicle, and comprising a connection confirmation terminal and a connection confirmation circuit, the connection confirmation circuit is used for outputting a connection confirmation signal to the electric vehicle A connection confirmation terminal, wherein when the charging gun and the electric vehicle are in a normal connection state, the connection confirmation signal has a first voltage level, and when the charging gun and the electric vehicle are in an abnormal connection state , 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 AC power received by the power plug to the charging gun, and comprising 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 outputting a corresponding temperature signal when the temperature of the power plug or the control box exceeds a predetermined temperature level ;as well as 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. 2. The charging device of claim 1, wherein the temperature protection circuit comprises a switch circuit, the switch circuit is connected to a voltage source, the second control unit is connected to the connection confirmation terminal, wherein the switch circuit is based on the corresponding A temperature signal selectively connects the voltage source with the connection confirmation terminal. 3. The charging device as claimed in claim 2, wherein the switch circuit comprises a third resistance unit, a fourth resistance unit, a diode and a PNP transistor, a terminal of the third resistance unit and the voltage source and The emitter of the PNP transistor is 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 transistor, and the other end of the fourth resistance unit is connected to the first The two control units are connected, the collector of the PNP transistor is connected to the anode of the diode, and the cathode of the diode is connected to the charging gun. 4. The charging device of claim 1, wherein the connection confirmation circuit comprises 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 The first resistance unit is connected in series with the second resistance unit, wherein 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 is maintained. maintaining the second voltage level. 5 . The charging device of 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 the alternating current. 6 . 6 . The charging device of 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. 7 . voltage level. 7 . The charging device of claim 1 , wherein the abnormal connection state means that the charging gun is not properly connected to the electric vehicle. 8 . 8. A charging device configured to charge an electric vehicle, the electric vehicle comprising 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 Equipment includes: a power plug for receiving AC power from a commercial AC power source; a charging gun connected to the power plug through a charging cable and detachably connected to the electric vehicle; a control box, connected between the power plug and the charging gun, configured to selectively transmit the AC power received by the power plug to the charging gun, and comprising 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 outputting a corresponding temperature signal when the temperature of the power plug or the control box exceeds a predetermined temperature level ;as well as 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 temperature The second wireless transmission module of the protection circuit outputs a wireless signal 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, executes a protection mechanism. 9 . The charging device of claim 8 , wherein the protection mechanism is to notify the control box to stop transmitting the alternating current and/or reduce the current demand of the electric vehicle. 10 . 10. The charging device of claim 8, wherein the first wireless transmission module and the second wireless transmission module are both Bluetooth transmission modules.

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