Power supply control device and AC charging pile

Abstract

The embodiment of the present invention provides a power supply control device and an AC charging pile, which relate to the technical field of charging circuits. The power supply control device is applied to an AC charging pile, and the AC charging pile includes a power supply device and a heating element. The power supply device, the power supply control device and an external power receiving element are electrically connected in sequence. When the AC charging pile charges the external power receiving element, the heating element generates heat. The power supply control device detects the temperature of the heating element and controls the power supply device to stop supplying power to the external power receiving element when the temperature exceeds a preset threshold, thereby realizing that when the temperature of the heating element exceeds the preset threshold, the power supply device is automatically controlled to stop supplying power to the external power receiving element.

Description

Technical Field

[0001] The present invention relates to the technical field of charging circuits, and in particular to a power supply control device and an AC charging pile. Background Art

[0002] In order to cope with efficient charging, charging piles are being used more and more widely. However, in the process of charging vehicles with charging piles, the high temperature of the charging piles may cause the vehicle to catch fire, causing safety problems.

[0003] In the prior art, a temperature detection point is usually added inside the charging pile, and a control module controls whether to disconnect the current output according to the temperature feedback from the temperature detection point. However, this method is inefficient. Summary of the invention

[0004] The objects of the present invention include, for example, providing a power supply control device and an AC charging pile, which can detect the temperature of the heating element in the AC charging pile when the AC charging pile charges an external power receiving element, and control the power supply device to stop supplying power to the external power receiving element when the temperature exceeds a preset threshold.

[0005] In order to achieve the above purpose, the technical solution adopted by the embodiment of the present invention is as follows:

[0006] In a first aspect, an embodiment of the present invention provides a power supply control device, which is applied to an AC charging pile, wherein the AC charging pile further comprises a power supply device and a heating element, wherein the power supply device, the power supply control device and an external power receiving element are electrically connected in sequence;

[0007] When the AC charging pile charges the external power receiving element, the heating element generates heat, and the power supply control device detects the temperature of the heating element and controls the power supply device to stop supplying power to the external power receiving element when the temperature exceeds a preset threshold.

[0008] In a possible implementation, the AC charging pile further includes a switch device, the power supply control device includes a temperature detection circuit and a control circuit, the power supply device, the switch device, the control circuit and the temperature detection circuit are electrically connected in sequence, and the control circuit is respectively connected to the external power receiving element and the power supply device through a live wire;

[0009] The temperature detection circuit is used to detect the temperature of the heating element during the process of the AC charging pile charging the external power receiving element;

[0010] The control circuit is used to control the switch device to be disconnected when the temperature exceeds the preset threshold value, and disconnect the power supply device from the external power receiving element.

[0011] In a possible implementation, the AC charging pile also includes a DC power supply, the temperature detection circuit includes a first voltage-dividing resistor and a thermistor, the DC power supply is connected in series with the first voltage-dividing resistor and the thermistor to ground, and the control circuit is electrically connected between the first voltage-dividing resistor and the thermistor.

[0012] In a possible implementation, the control circuit includes a main switch circuit, a first control circuit, and a second control circuit, the temperature detection circuit is electrically connected to the main switch circuit, the main switch circuit is electrically connected to the first control circuit and the second control circuit respectively, the first control circuit is also electrically connected to the switch device, and the second control circuit is also connected to the power supply device and the external power receiving element through the live wire;

[0013] The main switch circuit is used to output a high level when the temperature detected by the temperature detection circuit exceeds the preset threshold;

[0014] The first control circuit is used to control the switch device to be disconnected when the main switch circuit outputs a high level;

[0015] The second control circuit is used to disconnect the power supply device from the external power receiving element when the main switch circuit outputs a high level.

[0016] In a possible implementation, the AC charging pile also includes a DC power supply; the main switch circuit includes a first protection resistor and a first transistor; the base of the first transistor is electrically connected between the first voltage divider resistor and the thermistor in the temperature detection circuit, the collector of the first transistor is connected in series with the first protection resistor and connected to the DC power supply, and the emitter of the first transistor is grounded.

[0017] In a possible implementation, the first control circuit includes a first switching circuit and a first cut-off circuit, and the switching device, the first cut-off circuit, the first switching circuit and the main switching circuit are electrically connected in sequence; when the main switching circuit outputs a high level, the first switching circuit is turned on so that the first cut-off circuit disconnects the switching device.

[0018] In a possible implementation manner, the AC charging pile further includes a DC power supply, the first cut-off circuit includes a first relay and a first diode, and the first switch circuit includes a second voltage-dividing resistor, a third voltage-dividing resistor and a second transistor;

[0019] A first end of the coil of the first relay is electrically connected to the DC power supply and to the cathode of the first diode, a second end is electrically connected to the collector of the second transistor and to the anode of the first diode, and two contacts of the first relay are electrically connected to the switching device; one end of the second voltage-dividing resistor is electrically connected to the main switching circuit, and the other end is connected in series with a third voltage-dividing resistor and is grounded; a base of the second transistor is electrically connected between the second voltage-dividing resistor and the third voltage-dividing resistor, and an emitter of the second transistor is grounded.

[0020] In a possible implementation manner, the second control circuit includes a second switch circuit and a second cut-off circuit; the main switch circuit, the second switch circuit and the second cut-off circuit are electrically connected in sequence, and the second cut-off circuit is connected to the power supply device and the external power receiving element through the live wire;

[0021] When the main switch circuit outputs a high level, the second switch circuit is turned off, so that the second cutoff circuit disconnects the power supply device from the external power receiving element.

[0022] In a possible implementation, the AC charging pile further includes a DC power supply, the second switch circuit includes a fourth voltage-dividing resistor, a fifth voltage-dividing resistor, a second protection resistor, a third transistor, a sixth voltage-dividing resistor, a seventh voltage-dividing resistor and a fourth transistor; the second cut-off circuit includes a second relay, a second diode and a third protection resistor;

[0023] One end of the fourth voltage-dividing resistor is electrically connected to the main switch circuit, and the other end is connected in series with the fifth voltage-dividing resistor and grounded; the base of the third triode is electrically connected between the fourth voltage-dividing resistor and the fifth voltage-dividing resistor, the collector of the third triode is connected in series with the second protection resistor and connected to the DC power supply, and the emitter of the third triode is grounded;

[0024] One end of the sixth voltage-dividing resistor is electrically connected to the collector of the third triode, and the other end is connected in series with the seventh voltage-dividing resistor and grounded; the base of the fourth triode is electrically connected between the sixth voltage-dividing resistor and the seventh voltage-dividing resistor, and the emitter of the fourth triode is grounded;

[0025] The first end of the coil of the second relay is electrically connected to the DC power supply and to the cathode of the second diode, and the second end is electrically connected to the collector of the fourth transistor and to the anode of the second diode; the first contact of the second relay is connected in series with the second protection resistor and connected to the DC power supply, the second contact is grounded, the third contact is connected to the power supply device through the live wire, and the fourth contact is connected to the external power receiving element through the live wire.

[0026] In a second aspect, an embodiment of the present invention further provides an AC charging pile, wherein the AC charging pile includes the power supply control device as described above.

[0027] Compared with the prior art, an embodiment of the present invention provides a power supply control device and an AC charging pile. The power supply control device is applied to the AC charging pile. The AC charging pile includes a power supply device and a heating element. The power supply device, the power supply control device and the external power receiving element are electrically connected in sequence. When the AC charging pile charges the external power receiving element, the heating element generates heat. The power supply control device detects the temperature of the heating element and controls the power supply device to stop supplying power to the external power receiving element when the temperature exceeds a preset threshold value, thereby realizing that when the temperature of the heating element exceeds the preset threshold value, the power supply device is automatically controlled to stop supplying power to the external power receiving element. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 A schematic diagram of an AC charging pile provided by the prior art.

[0030] Figure 2 A schematic diagram of an AC charging pile provided in an embodiment of the present invention.

[0031] Figure 3 A schematic diagram of an application scenario of the power supply control device provided in an embodiment of the present invention.

[0032] Figure 4 A schematic diagram of the structure of a power supply control device provided in an embodiment of the present invention.

[0033] Figure 5 Another structural schematic diagram of a power supply control device provided in an embodiment of the present invention.

[0034] Figure 6 A circuit diagram of a first control circuit provided in an embodiment of the present invention.

[0035] Figure 7 A circuit diagram of a second control circuit provided in an embodiment of the present invention.

[0036] Icons: 10-AC charging pile; 20-AC charging pile; 30-power supply control device; 40-heating element; 50-power supply device; 60-switching device; 70-control module; 31-temperature detection circuit; 32-control circuit; 100-main switching circuit; 200-first control circuit; 300-second control circuit; 210-first switching circuit; 220-first cut-off circuit; 310-second switching circuit; 320-second cut-off circuit. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0040] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0041] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0042] In the prior art, the conventional AC charging pile 10 is as follows Figure 1 As shown, it includes a power supply device, a control module and a heating element installed on the mainboard. The power supply device, the heating element and the external power receiving element are electrically connected in sequence, and the power supply device charges the external power receiving element through a live wire. The heating element can be the element with the highest temperature in the mainboard when the power supply device charges the external power receiving element, such as a relay, etc. The external power receiving element can be an electric car, etc.

[0043] A temperature detection point is provided near the heating element. A temperature detection chip is installed at the temperature detection point to detect the temperature of the heating element and send the detected temperature to the control module. The control module determines whether to disconnect the output switch K0 according to the detected temperature.

[0044] The above method needs to use the control module to determine whether to disconnect the output switch K0, which takes a certain amount of time. In addition, the above method can only disconnect the output switch and cannot fully guarantee safety.

[0045] In response to the above problems, this embodiment provides a power supply control device, which is applied to an AC charging pile. When the AC charging pile is charging an external power receiving element, it can detect the temperature of the heating element in the AC charging pile, and automatically control the power supply device to stop supplying power to the external power receiving element when the temperature exceeds a preset threshold.

[0046] Please refer to Figure 2 , Figure 2 A schematic diagram of the structure of the AC charging pile 20 provided in this embodiment is shown, which includes a power supply device 50, a heating element 40 and a power supply control device 30 installed on a mainboard. The power supply device 50, the heating element 40 and the external power receiving element are electrically connected in sequence. The power supply device 50 charges the external power receiving element through a live wire. The power supply control device 30 is electrically connected to the power supply device. The power supply control device 30 is also electrically connected to the power supply device 50 and the external power receiving element respectively through a live wire, and can detect the temperature of the heating element.

[0047] Please refer to Figure 3 , Figure 3 The power supply control device 30 provided in this embodiment is shown, which is applied to an AC charging pile 20. The AC charging pile 20 also includes a power supply device 50 and a heating element 40. The power supply device 50, the power supply control device 30 and the external power receiving element are electrically connected in sequence.

[0048] When the AC charging pile 20 charges the external power receiving element, the heating element 40 generates heat, and the power supply control device 30 detects the temperature of the heating element and controls the power supply device 50 to stop supplying power to the external power receiving element when the temperature exceeds a preset threshold.

[0049] In this embodiment, the power supply device 50, the heating element 40 and the external power receiving element are electrically connected in sequence through the live wire. The power supply device 50 is used to charge the external power receiving element. The heating element 40 can be the element with the highest temperature during the charging process, such as a relay.

[0050] The power supply control device 30 detects the temperature of the heating element 40 through the temperature detection point, and when the temperature exceeds a preset threshold, it disconnects the heating element from the power supply device to disconnect the input of current, and disconnects the heating element from the power supply device to disconnect the output of current, thereby causing the power supply device 50 to stop supplying power to the external power receiving element.

[0051] Please refer to Figure 4The AC charging pile also includes a switch device 60, and the power supply control device 30 includes a temperature detection circuit 31 and a control circuit 32. The power supply device 50, the switch device 60, the control circuit 32 and the temperature detection circuit 31 are electrically connected in sequence, and the control circuit 32 is respectively connected to the external power receiving element and the heating element 40 through a live wire, and the heating element 40 is electrically connected to the power supply device through a live wire.

[0052] The temperature detection circuit 31 is used to detect the temperature of the heating element 40 when the AC charging pile 20 is charging the external power receiving element.

[0053] The control circuit 32 is used to control the switch device 60 to be disconnected when the temperature exceeds a preset threshold value, and to disconnect the heating element 40 from the external power receiving element.

[0054] In this embodiment, the switch device 60 is used to control the output of the current of the power supply device 50, and may be an air switch or the like.

[0055] The control circuit 32 is used to control the switch device 60 to disconnect when the temperature exceeds a preset threshold value to cut off the input of current to the mainboard; and to cut off the connection between the heating element 40 and the external power receiving element to cut off the output of current in the mainboard.

[0056] Please refer to Figure 5 The AC charging pile also includes a DC power supply VDD, the temperature detection circuit 31 includes a first voltage-dividing resistor R1 and a thermistor NTC, the DC power supply VDD is connected in series with the first voltage-dividing resistor R1 and the thermistor NTC to ground, and the control circuit 32 is electrically connected between the first voltage-dividing resistor R1 and the thermistor NTC.

[0057] Optionally, the control circuit 32 includes a main switch circuit 100, a first control circuit 200 and a second control circuit 300, the temperature detection circuit 31 is electrically connected to the main switch circuit 100, the main switch circuit 100 is electrically connected to the first control circuit 200 and the second control circuit 300 respectively, the first control circuit 200 is also electrically connected to the switching device 60, and the second control circuit 300 is also connected to the heating element 40 and the external power receiving element through a live wire.

[0058] The main switch circuit 100 is used to output a high level when the temperature detected by the temperature detection circuit 31 exceeds a preset threshold.

[0059] The first control circuit 200 is used to control the switch device 60 to be disconnected when the main switch circuit 100 outputs a high level.

[0060] The second control circuit 300 is used to disconnect the heating element 40 from the external power receiving element when the main switch circuit 100 outputs a high level.

[0061] In this embodiment, the main switch circuit 100 is electrically connected between the first voltage-dividing resistor and the thermistor NTC.

[0062] The thermistor NTC is installed near the switch device 60 and is used to detect the temperature of the heating element 40. When the AC charging pile 20 charges the external power receiving element, the temperature of the heating element 40 increases, and the resistance value of the thermistor NTC decreases as the temperature increases.

[0063] Optional, please refer to Figure 6 The main switch circuit 100 includes a first protection resistor R2 and a first transistor Q1; the base B of the first transistor Q1 is electrically connected to the temperature detection circuit 31, that is, the base B of the first transistor Q1 is electrically connected between the first voltage-dividing resistor R1 and the thermistor NTC in the temperature detection circuit 31, the collector C of the first transistor is connected in series with the first protection resistor R2 and connected to the DC power supply VDD, and the emitter E of the first transistor Q1 is grounded.

[0064] Optionally, the first control circuit 200 includes a first switching circuit 210 and a first cut-off circuit 220, and the switching device 60, the first cut-off circuit 220, the first switching circuit 210 and the main switching circuit 100 are electrically connected in sequence, and the first switching circuit 210 is electrically connected between the first protection resistor R2 and the collector of the first transistor Q1; when the main switching circuit 100 outputs a high level, the first switching circuit 210 is turned on so that the first cut-off circuit 220 disconnects the switching device 60.

[0065] Optionally, the first cut-off circuit 220 includes a first relay K1 and a first diode D1 , and the first switch circuit 210 includes a second voltage-dividing resistor R3 , a third voltage-dividing resistor R4 , and a second transistor Q2 .

[0066] A first end of the coil of the first relay K1 is electrically connected to a DC power supply and to a cathode of the first diode D1, a second end is electrically connected to a collector C of the second transistor Q2 and to an anode of the first diode D1, and two contacts of the first relay K1 are electrically connected to a switch device 60; one end of the second voltage-dividing resistor R3 is electrically connected between the first protection resistor R2 and the collector C of the first transistor Q1, and the other end is connected in series with a third voltage-dividing resistor R4 and is grounded; a base B of the second transistor is electrically connected between the second voltage-dividing resistor R3 and the third voltage-dividing resistor R4, and an emitter E of the second transistor is grounded.

[0067] In this embodiment, when the switch device 60 is an air switch, the switch device 60 includes a shunt release, and two contacts of the first relay K1 are electrically connected to the shunt release.

[0068] When the AC charging pile 20 charges the external power receiving element, the temperature of the heating element rises, the resistance of the thermistor NTC decreases, and the voltage between the base B and the emitter E of the first transistor Q1 decreases. When the temperature of the heating element exceeds the preset threshold, the first transistor is turned off, the main switch circuit 100 outputs a high level, so that the first switch circuit 210 is turned on, the switch of the first relay K1 is closed, and the switch device 60 is turned off, so that the power supply device 50 stops charging the external power receiving element.

[0069] Optional, please refer to Figure 7 The second control circuit 300 includes a second switch circuit 310 and a second cut-off circuit 320; the main switch circuit 100, the second switch circuit 310 and the second cut-off circuit 320 are electrically connected in sequence; the second switch circuit is electrically connected between the first protection resistor R2 and the collector C of the first transistor Q1, and the second cut-off circuit 320 is connected to the heating element 40 and the external power receiving element through a live wire.

[0070] When the main switch circuit 100 outputs a high level, the second switch circuit 310 is turned off, so that the second cutoff circuit 320 disconnects the heating element 40 from the external power receiving element.

[0071] Optionally, the second switch circuit 310 includes a fourth voltage-dividing resistor R5, a fifth voltage-dividing resistor R6, a second protection resistor R7, a third transistor Q3, a sixth voltage-dividing resistor R8, a seventh voltage-dividing resistor R9 and a fourth transistor Q4; the second cut-off circuit 320 includes a second relay K2, a second diode D2 and a third protection resistor R10.

[0072] One end of the fourth voltage-dividing resistor R5 is electrically connected to the main switch circuit 100, and the other end is connected in series with the fifth voltage-dividing resistor R6 and grounded; the base B of the third transistor is electrically connected between the fourth voltage-dividing resistor R5 and the fifth voltage-dividing resistor R6, the collector C of the third transistor is connected in series with the second protection resistor R7 and connected to the DC power supply VDD, and the emitter E of the third transistor is grounded.

[0073] One end of the sixth voltage-dividing resistor R8 is electrically connected to the collector B of the third transistor, and the other end is connected in series with the seventh voltage-dividing resistor R9 and grounded; the base B of the fourth transistor is electrically connected between the sixth voltage-dividing resistor R8 and the seventh voltage-dividing resistor R9, and the emitter E of the fourth transistor is grounded.

[0074] The first end 1 of the coil of the second relay K2 is electrically connected to the DC power supply VDD and to the cathode of the second diode D2, and the second end 2 is electrically connected to the collector C of the fourth transistor Q4 and to the anode of the second diode; the first contact 3 of the second relay K2 is connected in series with the second protection resistor R10 to the DC power supply VDD, the second contact 4 is grounded, the third contact 5 is connected to the heating element 40 through the live wire, and the fourth contact 6 is connected to the external power receiving element through the live wire.

[0075] In this embodiment, the second relay K2 is a three-phase four-wire relay.

[0076] When the main switch circuit 100 outputs a high level, the third transistor Q3 is turned on. At this time, the collector of the third transistor Q3 outputs a low level, so that the fourth transistor Q4 is turned off, and the switch between the first contact 3 and the second contact 4 of the second relay K2, and the switch between the third contact 5 and the fourth contact 6 are disconnected, thereby disconnecting the heating element from the external power receiving element.

[0077] Optionally, the AC charging pile 20 also includes a control module 70, and the second cut-off circuit 320 also includes an eighth voltage-dividing resistor R11 and a filter capacitor C1, one end of the eighth voltage-dividing resistor R11 is electrically connected to the first contact 3 of the second relay, and the other end is connected in series with the filter capacitor C1 and grounded, and the control module 70 is electrically connected between the eighth voltage-dividing resistor R11 and the filter capacitor C1.

[0078] In this embodiment, after the second relay K2 is disconnected, the switch between the third contact 5 and the sixth contact 6 may be stuck and remain closed. Since the states of the switch between the third contact 5 and the fourth contact 6 and the switch between the first contact 3 and the second contact 4 are synchronized, the control module 70 can determine whether the switch of the second relay K2 is disconnected by monitoring the voltage of the eighth voltage-dividing resistor R11.

[0079] If the voltage of the eighth voltage-dividing resistor R11 is zero, it indicates that the switch of the relay K2 is stuck. At this time, the control module 70 can control the switch to be disconnected in other ways to ensure that the heating element 40 and the external power receiving element are disconnected. If the voltage of the eighth voltage-dividing resistor R11 is not zero, it indicates that the switch of the second relay K2 has been disconnected.

[0080] Optionally, the power supply control device 30, the heating element 40 and the control module 70 are integrated into the same mainboard.

[0081] The working principle of the power supply control device provided in the embodiment of the present invention is as follows:

[0082] When the AC charging pile charges the external power receiving element, the temperature of the heating element increases, causing the resistance of the thermistor NTC to decrease, and the voltage between the base B and the emitter E of the first transistor Q1 to decrease. When the temperature of the heating element exceeds the preset threshold, the first transistor Q1 is turned off, the main switch circuit 100 outputs a high level, causing the transistor Q2 to turn on, and the switch of the first relay K1 is closed, so that the switch device 60 is disconnected, so that the power supply device 50 stops charging the external power receiving element.

[0083] At the same time, the high level output by the main switch circuit 100 turns on the third transistor Q3, and the collector of the third transistor outputs a low level, and turns off the fourth transistor Q4, thereby disconnecting the switch between the first contact 3 and the second contact 4 of the second relay K2, and the switch between the third contact 5 and the fourth contact 6, thereby disconnecting the connection between the heating element and the external power receiving element.

[0084] Compared with the prior art, this embodiment has the following beneficial effects:

[0085] First, the power supply control device provided in this embodiment can automatically control the power supply device to supply power to the external power receiving element when the AC charging pile charges the external power receiving element if the temperature of the heating element exceeds a preset threshold, thereby eliminating the step of control module judgment and achieving higher efficiency.

[0086] Then, the power supply control device provided in this embodiment can control the switch device to disconnect and disconnect the connection between the heating element and the external power receiving element when the AC charging pile charges the external power receiving element if the temperature of the heating element exceeds a preset threshold, so as to simultaneously disconnect the input and output of the current, thereby improving safety.

[0087] Finally, the power supply control device provided in this embodiment does not require an additional temperature monitoring chip, has a simple circuit structure and is low in cost.

[0088] In summary, an embodiment of the present invention provides a power supply control device and an AC charging pile. The power supply control device is applied to an AC charging pile. The AC charging pile includes a power supply device and a heating element. The power supply device, the power supply control device and an external power receiving element are electrically connected in sequence. When the AC charging pile charges the external power receiving element, the heating element generates heat. The power supply control device detects the temperature of the heating element and controls the power supply device to stop supplying power to the external power receiving element when the temperature exceeds a preset threshold value, thereby realizing that when the temperature of the heating element exceeds the preset threshold value, the power supply device is automatically controlled to stop supplying power to the external power receiving element.

[0089] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A power supply control device, characterized in that: Applied to an AC charging pile, the AC charging pile further comprises a power supply device, a heating element and a switch device, wherein the power supply device, the power supply control device and the external power receiving element are electrically connected in sequence; the power supply control device comprises a temperature detection circuit and a control circuit; the power supply device, the switch device, the control circuit and the temperature detection circuit are electrically connected in sequence, and the control circuit is respectively connected to the external power receiving element and the heating element through a live wire, and the heating element is electrically connected to the power supply device through the live wire; The temperature detection circuit is used to detect the temperature of the heating element during the process of the AC charging pile charging the external power receiving element; The control circuit is used to control the switch device to disconnect when the temperature exceeds a preset threshold, and disconnect the heating element from the external power receiving element; Wherein, the control circuit includes a main switch circuit, a first control circuit and a second control circuit, the temperature detection circuit is electrically connected to the main switch circuit, the main switch circuit is electrically connected to the first control circuit and the second control circuit respectively, the first control circuit is also electrically connected to the switch device, and the second control circuit is also connected to the heating element and the external power receiving element through the live wire; The main switch circuit is used to output a high level when the temperature detected by the temperature detection circuit exceeds the preset threshold; The first control circuit is used to control the switch device to be disconnected when the main switch circuit outputs a high level; The second control circuit is used to disconnect the heating element from the external power receiving element when the main switch circuit outputs a high level.

2. The power supply control device according to claim 1, characterized in that: The AC charging pile also includes a DC power supply, the temperature detection circuit includes a first voltage-dividing resistor and a thermistor, the DC power supply is connected in series with the first voltage-dividing resistor and the thermistor and is grounded, and the control circuit is electrically connected between the first voltage-dividing resistor and the thermistor.

3. The power supply control device according to claim 1, characterized in that: The AC charging pile also includes a DC power supply; the main switch circuit includes a first protection resistor and a first transistor; the base of the first transistor is electrically connected between the first voltage divider resistor and the thermistor in the temperature detection circuit, the collector of the first transistor is connected in series with the first protection resistor and the DC power supply, and the emitter of the first transistor is grounded.

4. The power supply control device according to claim 1, characterized in that: The first control circuit includes a first switch circuit and a first cut-off circuit, and the switch device, the first cut-off circuit, the first switch circuit and the main switch circuit are electrically connected in sequence; when the main switch circuit outputs a high level, the first switch circuit is turned on so that the first cut-off circuit disconnects the switch device.

5. The power supply control device according to claim 4, characterized in that: The AC charging pile further includes a DC power supply, the first cut-off circuit includes a first relay and a first diode, and the first switch circuit includes a second voltage-dividing resistor, a third voltage-dividing resistor and a second triode; A first end of the coil of the first relay is electrically connected to the DC power supply and to the cathode of the first diode, a second end is electrically connected to the collector of the second transistor and to the anode of the first diode, and two contacts of the first relay are electrically connected to the switching device; one end of the second voltage-dividing resistor is electrically connected to the main switching circuit, and the other end is connected in series with a third voltage-dividing resistor and is grounded; a base of the second transistor is electrically connected between the second voltage-dividing resistor and the third voltage-dividing resistor, and an emitter of the second transistor is grounded.

6. The power supply control device according to claim 1, characterized in that: The second control circuit includes a second switch circuit and a second cut-off circuit; the main switch circuit, the second switch circuit and the second cut-off circuit are electrically connected in sequence, and the second cut-off circuit is connected to the heating element and the external power receiving element through the live wire; When the main switch circuit outputs a high level, the second switch circuit is turned off, so that the second cutoff circuit disconnects the heating element from the external power receiving element.

7. The power supply control device according to claim 6, characterized in that: The AC charging pile also includes a DC power supply, the second switch circuit includes a fourth voltage-dividing resistor, a fifth voltage-dividing resistor, a second protection resistor, a third transistor, a sixth voltage-dividing resistor, a seventh voltage-dividing resistor and a fourth transistor; the second cut-off circuit includes a second relay, a second diode and a third protection resistor; One end of the fourth voltage-dividing resistor is electrically connected to the main switch circuit, and the other end is connected in series with the fifth voltage-dividing resistor and grounded; the base of the third triode is electrically connected between the fourth voltage-dividing resistor and the fifth voltage-dividing resistor, the collector of the third triode is connected in series with the second protection resistor and connected to the DC power supply, and the emitter of the third triode is grounded; One end of the sixth voltage-dividing resistor is electrically connected to the collector of the third triode, and the other end is connected in series with the seventh voltage-dividing resistor and grounded; the base of the fourth triode is electrically connected between the sixth voltage-dividing resistor and the seventh voltage-dividing resistor, and the emitter of the fourth triode is grounded; The first end of the coil of the second relay is electrically connected to the DC power supply and to the cathode of the second diode, and the second end is electrically connected to the collector of the fourth transistor and to the anode of the second diode; the first contact of the second relay is connected in series with the second protection resistor and connected to the DC power supply, the second contact is grounded, the third contact is connected to the heating element through the live wire, and the fourth contact is connected to the external power receiving element through the live wire.

8. An AC charging pile, characterized in that: The AC charging pile includes a power supply control device as described in any one of claims 1-7.

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