AC charging device, AC charging pile and AC charging system
By combining phase selectors, charging interfaces, communication circuits, and control circuits, the problems of insufficient load management and balancing flexibility of traditional AC charging devices are solved, enabling flexible selection of three-phase AC power sources, improving power system stability and equipment utilization, and reducing operating costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-06
- Publication Date
- 2026-03-10
AI Technical Summary
The fixed electrical connections of traditional AC charging devices result in insufficient flexibility in load management and balancing, especially in multi-vehicle charging scenarios, leading to problems such as load imbalance, uneven resource utilization, shortened equipment lifespan, and lack of flexibility.
By combining a phase selector, charging interface, communication circuit, and control circuit, flexible selection and control of the three-phase AC power supply can be achieved, allowing the AC charging device to select one phase of the three-phase AC power supply for output.
It enables flexible output selection for AC charging devices, improves the flexibility of load management, reduces the risk of voltage fluctuations, optimizes resource utilization, extends equipment life, and reduces operating costs.
Smart Images
Figure CN223986960U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of AC charging, and more particularly to an AC charging device, an AC charging pile, and an AC charging system. Background Technology
[0002] Currently, AC charging devices are one of the most widely used types of charging equipment on the market, especially for providing medium-speed charging services for electric vehicles in homes and public places. These devices can typically fully charge an electric vehicle with a standard battery capacity in 4 to 8 hours, making them suitable for scenarios involving long-term parking, such as residential areas and office building parking lots.
[0003] However, with the increasing number of electric vehicles on the road, the limitations of traditional AC charging devices are becoming increasingly apparent. One problem with traditional AC charging devices is that their electrical connections are fixed; that is, they are fixedly connected to a single phase of the power system during installation. This fixed connection limits the flexibility of charging stations in terms of load management and balancing, especially in multi-parking scenarios such as parking lots. Summary of the Invention
[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide an AC charging device, an AC charging pile and an AC charging system, which aims to enable the AC charging device to flexibly select one phase of the three-phase AC power supply for output.
[0005] The technical solution of this utility model is as follows:
[0006] An AC charging device, comprising:
[0007] A phase selector, the input of which is used to connect to a three-phase AC power supply;
[0008] A charging interface is used to connect a device to be charged, and the charging interface is connected to the output terminal of the phase selector;
[0009] A communication circuit for communicating with external devices, wherein the communication circuit is used to receive and output a phase selection signal from the external device;
[0010] The control circuit has its input terminal connected to the output terminal of the communication circuit and its output terminal connected to the controlled terminal of the phase selector. The control circuit is used to receive the phase selection signal output by the communication circuit and control the phase selector to select one phase of the three-phase AC power supply to be output to the device to be charged through the charging interface according to the phase selection signal.
[0011] Optionally, the phase selector includes:
[0012] The three-way switching circuit has its input terminal connected to one phase of a three-phase AC power supply, its output terminal connected to the charging interface, and its controlled terminal connected to the output terminal of the control circuit.
[0013] Optionally, the switching circuit includes:
[0014] A relay, wherein the controlled terminal of the relay is connected to the output terminal of the control circuit, and the input terminal of the relay is connected to one phase of a three-phase AC power supply;
[0015] An AC contactor, wherein the controlled terminal of the AC contactor is connected to the output terminal of the control circuit, the input terminal of the AC contactor is connected to the output terminal of the relay and one phase of the three-phase AC power supply respectively, and the output terminal of the AC contactor is connected to the charging interface;
[0016] The control circuit is used to control the relay and the AC contactor to conduct according to the phase selection signal, so that one phase of the three-phase AC power supply is output to the device to be charged through the charging interface.
[0017] Optionally, the AC charging device further includes:
[0018] A rectifier circuit is provided, the input of which is connected to the output of the phase selector, and the output of which is connected to the charging interface. The rectifier circuit is used to rectify the three-phase AC power output by the phase selector and output DC power to the charging interface.
[0019] Optionally, the AC charging device further includes:
[0020] Battery pack;
[0021] A first voltage conversion circuit is configured to convert the DC power output from the rectifier circuit into a first DC voltage and then output it to the battery pack and the phase selector.
[0022] The second voltage conversion circuit has its input terminal connected to the output terminal of the first voltage conversion circuit, and its output terminal connected to the power supply terminal of the control circuit. The second voltage conversion circuit is used to convert the first DC voltage output by the first voltage conversion circuit into a second DC voltage and then output it to the control circuit.
[0023] Optionally, the AC charging device further includes:
[0024] An expansion board, which is electrically connected to the control circuit, is used to connect external devices.
[0025] Optionally, the AC charging device further includes:
[0026] Printed circuit boards;
[0027] The housing has a cavity, the printed circuit board is housed within the housing, the phase selector, the communication circuit and the control circuit are disposed on the printed circuit board, and the charging interface is disposed on the housing.
[0028] This utility model also proposes an AC charging pile, including a charging pile body, a charging gun head, and an AC charging device as described above. The AC charging device is disposed in the charging pile body, and the charging gun head is disposed on the charging pile body. The charging gun head is used to connect to the device to be charged.
[0029] Optionally, the AC charging station further includes:
[0030] The control panel is located on the charging pile body and is electrically connected to the charging gun head. When triggered, the control panel controls the charging gun head to charge the device to be charged.
[0031] This utility model also proposes an AC charging system, including a vehicle to be charged and a plurality of AC charging piles as described above, wherein the charging gun head of the AC charging pile is used to connect to the charging port of the vehicle to be charged.
[0032] This utility model's technical solution comprises an AC charging device using a phase selector, a charging interface, a communication circuit, and a control circuit. The input terminal of the phase selector connects to a three-phase AC power supply; the charging interface connects to the device to be charged and is connected to the output terminal of the phase selector; the communication circuit communicates with external devices, receiving and outputting phase selection signals from these devices; the input terminal of the control circuit connects to the output terminal of the communication circuit, and its output terminal connects to the controlled terminal of the phase selector. The control circuit receives the phase selection signal from the communication circuit and, based on this signal, controls the phase selector to select one phase of the three-phase AC power supply for output through the charging interface to the device to be charged. Thus, by receiving the phase selection signal through the control circuit, this AC charging device can control the phase selector to select one phase of the three-phase AC power supply for output through the charging interface, enabling flexible selection of the output phase from the three-phase AC power supply. Attached Figure Description
[0033] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0034] Figure 1 This is a functional module schematic diagram of an embodiment of the AC charging device of this utility model.
[0035] Figure 2 This is a schematic diagram of the circuit structure of an embodiment of the switching circuit in the AC charging device of this utility model.
[0036] Figure 3 This is a functional module schematic diagram of another embodiment of the AC charging device of this utility model.
[0037] Figure 4 This is a functional module schematic diagram of an embodiment of the AC charging pile of this utility model.
[0038] Explanation of reference numerals in the attached drawings: 10, phase selector; 20, control circuit; 30, communication circuit; 40, charging interface; 50, rectifier circuit; 60, first voltage conversion circuit; 70, second voltage conversion circuit; 80, battery pack; 100, AC charging device; 110, charging pile body; 120, charging gun head; 130, control panel; U1, relay; U2, AC contactor. Detailed Implementation
[0039] To make the objectives, technical solutions, and effects of this utility model clearer and more explicit, the present utility model will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0040] In the implementation methods and claims, unless otherwise specified in the text, the terms "a," "an," "the," and "the" may also include plural forms. If the embodiments of this utility model involve descriptions of "first," "second," etc., such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.
[0041] It should be further understood that the term "comprising" as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when an element is referred to as "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements present. Furthermore, "connected" or "coupled" as used herein can include wireless connections or wireless coupling. The term "and / or" as used herein includes all or any unit and all combinations of one or more associated listed items.
[0042] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.
[0043] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0044] Currently, AC charging devices are one of the most widely used types of charging equipment on the market, especially for providing medium-speed charging services for electric vehicles in homes and public places. These devices can typically fully charge an electric vehicle with a standard battery capacity in 4 to 8 hours, making them suitable for scenarios involving long-term parking, such as residential areas and office building parking lots.
[0045] However, with the increasing number of electric vehicles on the road, the limitations of traditional AC charging devices are becoming increasingly apparent. One problem with traditional AC charging devices is that their electrical connections are fixed; that is, they are fixedly connected to a single phase of the power system during installation. This fixed connection limits the flexibility of charging stations in terms of load management and balancing, especially in multi-parking scenarios such as parking lots.
[0046] Specifically, the phase distribution of the charging load for electric vehicles in a charging station depends entirely on which phase the charging device connected to each parking space is on. This leads to the following problems:
[0047] Load imbalance: Charging devices in parking lots are fixedly connected to a single phase, making it impossible to dynamically adjust the power load distribution based on actual vehicle parking conditions. If multiple vehicles happen to park in spaces connected to the same phase, the load on that phase will increase significantly, while other phases may have a light load or even no load. This imbalance poses a significant risk of voltage fluctuations to the power grid, affecting the stability of the power system and increasing losses in the distribution system.
[0048] Uneven resource utilization: Due to the fixed nature of electrical connections, some phases may operate under overload during peak hours, while charging resources in other phases remain idle. This uneven resource allocation not only wastes the potential utilization of equipment but may also lead to slower charging speeds for users charging on high-load phases (due to capacity limitations of power system equipment on each phase), reducing user experience and increasing the operating costs of the substation.
[0049] Shortened equipment lifespan: Electrical equipment connected to the charging station load, such as transformers and cables, will experience additional aging and wear due to prolonged operation under conditions of high phase-to-phase imbalance, thus affecting the overall lifespan of the equipment. This forces station operators to increase equipment maintenance and replacement costs and reduces system stability.
[0050] Insufficient flexibility: The fixed connection of traditional AC charging devices prevents power stations from dynamically adjusting the distribution and use of charging equipment according to the actual power system load. This means that during periods when the load on a certain phase of the grid is relatively light, the power station cannot achieve system-level load balancing and cost optimization by switching the connection phase of the charging devices, and cannot effectively utilize the flexible load resource of electric vehicles.
[0051] To address the aforementioned problems, this utility model proposes an AC charging device.
[0052] Reference Figure 1 In one embodiment, the AC charging device 100 includes:
[0053] Phase selector 10, the input terminal of which is used to connect to a three-phase AC power supply;
[0054] A charging interface 40 is used to connect a device to be charged, and the charging interface 40 is connected to the output terminal of the phase selector 10.
[0055] The communication circuit 30 is used to communicate with external devices. The communication circuit 30 is used to receive and output the phase selection signal output by the external device.
[0056] The control circuit 20 has its input terminal connected to the output terminal of the communication circuit 30 and its output terminal connected to the controlled terminal of the phase selector 10. The control circuit 20 is used to receive the phase selection signal output by the communication circuit 30 and control the phase selector 10 to select one phase of the three-phase AC power supply to be output to the device to be charged through the charging interface 40 according to the phase selection signal.
[0057] In this embodiment, the phase selector 10 can be composed of multiple switching devices, such as a relay U1. By controlling the on / off state of the switching devices, one phase of the three-phase AC power supply can be selected for output. The charging interface 40 can be adapted to the device to be charged. For example, if the device to be charged is a mobile phone or an electric vehicle, a corresponding charging interface 40 needs to be set for connection. The communication circuit 30 can be a wireless communication circuit 30 or a wired communication circuit 30. Wireless communication technologies include Wi-Fi, Bluetooth, cellular networks (such as 4G, 5G), satellite communication, etc., while wired communication technologies include Ethernet, fiber optic communication, telephone lines, etc. It can be understood that the AC charging device 100 is applied to an AC charging pile. If the AC charging pile is fixed, it can receive the phase selection signal output by the external device through wireless or wired communication. If the AC charging pile is mobile, it needs to use the wireless communication circuit 30 to communicate with the external device, such as a computer or control platform. Therefore, the communication circuit 30 can be selected according to the setting method of the AC charging pile, and the AC charging device 100 in this embodiment can be applied to fixed or mobile AC charging piles. The controller can be a digital signal processor (DSP), a programmable logic device (PLD), a field-programmable gate array (FPGA), a microprocessor, a microcontroller (MCU), or other electronic components. The communication circuit 30 receives the phase selection signal from the external device, demodulates it, and outputs it to the control circuit 20. The control circuit 20 then controls the switching of multiple devices in the phase selector 10 according to the phase selection signal, thereby allowing one phase of the three-phase AC power supply to be output to the device to be charged through the charging interface 40. Thus, the AC charging device 100 in this embodiment can flexibly select one phase of the three-phase AC power supply to output.
[0058] This utility model's technical solution comprises an AC charging device 100 consisting of a phase selector 10, a charging interface 40, a communication circuit 30, and a control circuit 20. The input terminal of the phase selector 10 is used to connect to a three-phase AC power supply; the charging interface 40 is used to connect to the device to be charged and is connected to the output terminal of the phase selector 10; the communication circuit 30 is used for communication with external devices, and can receive and output phase selection signals from external devices; the input terminal of the control circuit 20 is connected to the output terminal of the communication circuit 30, and the output terminal of the control circuit 20 is connected to the controlled terminal of the phase selector 10. The control circuit 20 can receive the phase selection signal output by the communication circuit 30 and, based on the phase selection signal, control the phase selector 10 to select one phase of the three-phase AC power supply and output it to the device to be charged through the charging interface 40. Thus, the AC charging device 100 of this utility model receives a phase selection signal through the control circuit 20, and can control the phase selector 10 to select one phase of the three-phase AC power supply for output through the charging interface 40, thereby enabling the AC charging device 100 to flexibly select one phase of the three-phase AC power supply for output.
[0059] In one embodiment, the phase selector 10 includes:
[0060] The three-way switching circuit has its input terminal connected to one phase of the three-phase AC power supply, its output terminal connected to the charging interface 40, and its controlled terminal connected to the output terminal of the control circuit 20.
[0061] In this embodiment, the phase selector 10 can be composed of three switching circuits, so that each switching circuit can be connected to one phase of the three-phase AC power supply. The control circuit 20 controls one switching circuit to conduct the electrical connection between one phase of the three-phase AC power supply and the charging interface 40, so that one phase of the three-phase AC power supply connected to the switching circuit can be output to the device to be charged through the charging interface 40.
[0062] It should be noted that if the AC power supply is multi-phase in actual application, the switching circuit in the phase selector 10 can also be configured with multiple channels accordingly.
[0063] In another embodiment, this solution can also connect an air switch in series between the phase selector 10 and the three-phase AC power supply to provide protection, such as overload protection, leakage protection, and isolation protection.
[0064] Reference Figure 2 In one embodiment, the switching circuit includes:
[0065] Relay U1, the controlled terminal of relay U1 is connected to the output terminal of control circuit 20, and the input terminal of relay U1 is connected to one phase of three-phase AC power supply;
[0066] AC contactor U2, the controlled terminal of AC contactor U2 is connected to the output terminal of control circuit 20, the input terminal of AC contactor U2 is connected to the output terminal of relay U1 and one phase of three-phase AC power supply respectively, and the output terminal of AC contactor U2 is connected to charging interface 40.
[0067] The control circuit 20 is used to control the relay U1 and the AC contactor U2 to conduct according to the phase selection signal, so that one phase of the three-phase AC power supply is output to the device to be charged through the charging interface 40.
[0068] In this embodiment, the switching circuit can be composed of a relay U1 and an AC contactor U2. This allows the switching circuit to be activated or deactivated based on the model of the relay U1 and AC contactor U2 input to the control circuit 20. The controller in the control circuit 20 can include multiple output ports, which are respectively connected to the controlled terminals (coil ports) of the relay U1 and the AC contactor U2 in the switching circuit. This enables control of the relay U1 and the AC contactor U2, allowing one phase of the three-phase AC power supply to be output to the device to be charged through the switching circuit and the charging interface 40. Figure 2 V in the equation can be a 24V DC power supply.
[0069] Reference Figure 3 In one embodiment, the AC charging device 100 further includes:
[0070] A rectifier circuit 50 is provided, the input of which is connected to the output of the phase selector 10, and the output of which is connected to the charging interface 40. The rectifier circuit 50 is used to rectify the three-phase AC power output from the phase selector 10 and output DC power to the charging interface 40.
[0071] In this embodiment, the rectifier circuit 50 can be composed of multiple diodes and capacitors, among other electronic components. The rectifier circuit 50 receives three-phase AC power from the phase selector 10, and after rectification, converts it into DC power output to the charging interface 40. During rectification, the rectifier circuit 50 effectively filters out fluctuations and noise in the AC power supply, outputting a stable DC voltage to ensure the safety and efficiency of the charging process. The AC charging device 100 of this solution converts three-phase AC power into DC power through the rectifier circuit 50, offering advantages such as simple structure, high efficiency, and strong stability.
[0072] Reference Figure 3In one embodiment, the AC charging device 100 further includes:
[0073] Battery pack 80;
[0074] A first voltage conversion circuit 60 is connected to the output of the rectifier circuit 50, and its output is connected to the input of the battery pack 80 and the power input of the phase selector 10. The first voltage conversion circuit 60 is used to convert the DC power output by the rectifier circuit 50 into a first DC voltage and then output it to the battery pack 80 and the phase selector 10.
[0075] The second voltage conversion circuit 70 has its input terminal connected to the output terminal of the first voltage conversion circuit 60 and its output terminal connected to the power supply terminal of the control circuit 20. The second voltage conversion circuit 70 is used to convert the first DC voltage output by the first voltage conversion circuit 60 into a second DC voltage and then output it to the control circuit 20.
[0076] In this embodiment, the battery pack 80 of the AC charging device 100 can be connected to the charging interface 40, thereby connecting to the device to be charged. When the portable AC charging pile equipped with the AC charging device 100 of this embodiment moves and cannot be connected to a three-phase AC power source, the battery pack 80 can supply power to the device to be charged. The battery pack 80 can be composed of multiple batteries. The first voltage conversion circuit 60 can step down the DC power output from the rectifier circuit 50 and output it to the battery pack 80 for charging, and also output it to the switching circuit to power the relay U1 in the switching circuit. For example, if the rectifier circuit 50 outputs a 380V DC power, the first voltage conversion circuit 60 can step it down to 24V before outputting it, which can prevent the battery or components in the switching circuit from being damaged by excessive voltage. Similarly, the second voltage conversion circuit 70 can step down the first DC voltage and output a second DC voltage to the control circuit 20 to power the controller in the control circuit 20. For example, it can step down the 24V voltage to 12V before outputting it to the controller.
[0077] In one embodiment, the AC charging device 100 further includes:
[0078] An expansion board is electrically connected to the control circuit 20 and is used to connect external devices.
[0079] In this embodiment, the expansion board can be a module used to expand the input / output interfaces of the controller in the control circuit 20. Depending on the specific design and function, the expansion board can connect to various devices, such as sensors, actuators, communication modules, and display devices. This increases the functionality of the control circuit 20 and makes it suitable for more scenarios.
[0080] In one embodiment, the AC charging device 100 further includes:
[0081] Printed circuit boards;
[0082] The housing has a cavity, the printed circuit board is housed in the housing, the phase selector 10, the communication circuit 30 and the control circuit 20 are disposed on the printed circuit board, and the charging interface 40 is disposed on the housing.
[0083] In this embodiment, the housing can be used to fix the positional relationship of the printed circuit board, ensuring the safety and stability inside the accommodating cavity formed by the housing of the AC charging device 100. When the AC charging device 100 is working, the positional relationship of the circuit board will not change, and external gas or objects cannot fall on the printed circuit board, affecting the operation of the phase selector 10, communication circuit 30 and control circuit 20 on the printed circuit board.
[0084] This utility model also proposes an AC charging pile.
[0085] Reference Figure 4 In one embodiment, the AC charging pile includes a charging pile body 110, a charging gun head 120, and an AC charging device 100 as described above. The AC charging device 100 is disposed within the charging pile body 110, and the charging gun head 120 is disposed on the charging pile body 110. The charging gun head 120 is used to connect to the device to be charged. It is understood that since the AC charging device 100 described above is used in the AC charging pile of this utility model, the embodiments of the AC charging pile of this utility model include all the technical solutions of all embodiments of the AC charging device 100, and the achieved technical effects are completely the same, which will not be repeated here. In this embodiment, the AC charging pile can be moved. When the AC charging pile is moved, the device to be charged can be charged through the battery pack 80 in the AC charging device 100.
[0086] Reference Figure 4 In one embodiment, the AC charging station further includes:
[0087] A control panel 130 is disposed on the charging pile body 110. The control panel 130 is electrically connected to the charging gun head 120. The control panel 130 is used to control the charging gun head 120 to charge the device to be charged when triggered.
[0088] In this embodiment, the output power of the charging gun head 120 to the device to be charged can be controlled by the control panel 130. For example, different vehicles have different charging power, so the appropriate charging power can be controlled by the control panel 130.
[0089] This utility model also proposes an AC charging system.
[0090] In one embodiment, the AC charging system includes a vehicle to be charged and a plurality of AC charging piles as described above, wherein the charging gun head 120 of the AC charging pile is used to connect to the charging port of the vehicle to be charged. It is understood that, since the AC charging piles described above are used in the AC charging system of this utility model, the embodiments of the AC charging system of this utility model include all the technical solutions of all the embodiments of the AC charging piles described above, and the achieved technical effects are exactly the same, and will not be repeated here.
[0091] It should be understood that the application of this utility model is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.
Claims
1. An alternating current charging device, characterized by, The application relates to an alternating current charging device. The alternating current charging device comprises: a phase selector, an input end of the phase selector being connected to a three-phase alternating current power supply; a charging interface, the charging interface being connected to a device to be charged, and the charging interface being connected to an output end of the phase selector; a communication circuit, the communication circuit being connected to an external device, and the communication circuit being used for receiving a phase selection signal output by the external device; a control circuit, an input end of the control circuit being connected to an output end of the communication circuit, an output end of the control circuit being connected to a controlled end of the phase selector, the control circuit being used for receiving the phase selection signal output by the communication circuit, and the control circuit being used for controlling the phase selector to select one phase of the three-phase alternating current power supply and output the one phase to the device to be charged through the charging interface according to the phase selection signal; a rectifier circuit, an input end of the rectifier circuit being connected to an output end of the phase selector, an output end of the rectifier circuit being connected to the charging interface, and the rectifier circuit being used for rectifying the three-phase alternating current power supply output by the phase selector and outputting a direct current power to the charging interface; a battery pack; a first voltage conversion circuit, an input end of the first voltage conversion circuit being connected to an output end of the rectifier circuit, an output end of the first voltage conversion circuit being connected to an input end of the battery pack and a power supply input end of the phase selector, and the first voltage conversion circuit being used for converting the direct current power output by the rectifier circuit into a first direct current voltage and outputting the first direct current voltage to the battery pack and the phase selector; 2. The alternating current charging device of claim 1, wherein, a second voltage conversion circuit, an input end of the second voltage conversion circuit being connected to an output end of the first voltage conversion circuit, an output end of the second voltage conversion circuit being connected to a power supply end of the control circuit, and the second voltage conversion circuit being used for converting the first direct current voltage output by the first voltage conversion circuit into a second direct current voltage and outputting the second direct current voltage to the control circuit. The phase selector comprises:
3. The AC charging device of claim 2, wherein, a three-way switch circuit, an input end of each of the switch circuits being connected to one phase of the three-phase alternating current power supply, an output end of each of the switch circuits being connected to the charging interface, and a controlled end of each of the switch circuits being connected to an output end of the control circuit. The switch circuit comprises: a relay, a controlled end of the relay being connected to an output end of the control circuit, and an input end of the relay being connected to one phase of the three-phase alternating current power supply; an alternating current contactor, a controlled end of the alternating current contactor being connected to an output end of the control circuit, an input end of the alternating current contactor being connected to an output end of the relay and one phase of the three-phase alternating current power supply, and an output end of the alternating current contactor being connected to the charging interface; 4. The alternating current charging device of claim 1, wherein, the control circuit is used for controlling the relay and the alternating current contactor to be turned on according to the phase selection signal, so that one phase of the three-phase alternating current power supply is output to the device to be charged through the charging interface. The alternating current charging device further comprises:
5. The alternating current charging device of claim 1, wherein, an expansion board, the expansion board being electrically connected to the control circuit, and the expansion board being used for connecting an external device. The alternating current charging device further comprises: a printed circuit board. A housing is formed with a receiving cavity, the printed circuit board is received in the housing, the phase selector, the communication circuit and the control circuit are arranged on the printed circuit board, and the charging interface is arranged on the housing.
6. An alternating current charging post, characterized in that The charging pile body, the charging gun head and the AC charging device according to any one of claims 1-5 are included, the AC charging device is arranged in the charging pile body, the charging gun head is arranged on the charging pile body, and the charging gun head is used for connecting the device to be charged.
7. The AC charging station of claim 6, wherein, The AC charging pile further includes: A control panel is arranged on the charging pile body, the control panel is electrically connected with the charging gun head, and the control panel is used for controlling the charging gun head to charge the device to be charged when being triggered.
8. An alternating current charging system characterized by, The charging pile body, the charging gun head and the AC charging device according to any one of claims 1-5 are included, the AC charging device is arranged in the charging pile body, the charging gun head is arranged on the charging pile body, and the charging gun head is used for connecting the device to be charged.