Switching circuit and charging pile

Abstract

The utility model relates to the field of new energy, in particular to a switching circuit and a charging pile. The switching circuit comprises an input interface, an output interface, a first switching circuit, a second switching circuit and a controller, the input interface is configured to be electrically connected with a first-phase live wire, a second-phase live wire, a third-phase live wire and a zero line, and the output interface is configured to be electrically connected with an electric vehicle. The controller is electrically connected with the first switching circuit and the second switching circuit, and is used for controlling the first switching circuit to connect or disconnect the electrical connection between the first output end and the first input end, the second input end or the third input end. And controlling the second switching circuit to connect or disconnect the electric connection between the second output end and the second input end or the fourth input end. According to the embodiment of the invention, any two phases of live wires under an IT power system can be supported to carry out two-phase charging on the electric vehicle, any one phase of live wire under a TN power system / TT power system can be supported to carry out single-phase charging on the electric vehicle, and the utilization rate of commercial power can be improved.

Description

Technical Field

[0001] The utility model relates to the field of new energy, and particularly to a switching circuit and a charging pile. Background Art

[0002] A charging pile is a device used to charge electric vehicles to replenish the power of electric vehicles. The types of charging piles include DC charging piles, AC charging piles, and AC / DC integrated charging piles. Among them, DC charging piles are used to provide direct current for electric vehicles, AC charging piles are used to provide alternating current for electric vehicles, and AC / DC integrated charging piles are used to provide direct current or alternating current for electric vehicles.

[0003] Currently, AC charging piles usually use three-phase mains power supply. Since electric vehicles generally support single-phase charging, during actual charging, AC charging piles generally use a fixed single-phase power to charge electric vehicles. This will cause the load on this phase of electricity to be too heavy, while the loads on the other two phases of electricity are relatively light, resulting in the total power that the charging station can provide to electric vehicles being limited, and thus reducing the utilization rate of the mains power. Summary of the Utility Model

[0004] An object of the utility model is to provide a switching circuit and a charging pile to solve the technical problem of low utilization rate of mains power when the current AC charging pile charges an electric vehicle.

[0005] In a first aspect, an embodiment of the utility model provides a switching circuit, including:

[0006] An input interface, including a first input terminal, a second input terminal, a third input terminal, and a fourth input terminal. The first input terminal is configured to be electrically connected to a first-phase live wire, the second input terminal is configured to be electrically connected to a second-phase live wire, the third input terminal is configured to be electrically connected to a third-phase live wire, and the fourth input terminal is configured to be electrically connected to a neutral wire;

[0007] An output interface, including a first output terminal and a second output terminal. The first output terminal and the second output terminal are configured to be electrically connected to an electric vehicle;

[0008] A first switching circuit, configured to be electrically connected to the first input terminal, the second input terminal, the third input terminal, and the first output terminal respectively;

[0009] A second switching circuit, configured to be electrically connected to the second input terminal, the fourth input terminal, and the second output terminal respectively;

[0010] A controller, electrically connected to the first switch circuit and the second switch circuit respectively, is configured to control the first switch circuit to conduct or disconnect the electrical connection between the first output terminal and the first input terminal, the second input terminal, or the third input terminal, and control the second switch circuit to conduct or disconnect the electrical connection between the second output terminal and the second input terminal or the fourth input terminal.

[0011] Optionally, the first switch circuit includes:

[0012] A first single-pole double-throw relay, electrically connected to the controller, the first single-pole double-throw relay includes a first contact, a second contact, and a first blade, the first contact is electrically connected to the second input terminal, the second contact is electrically connected to the third input terminal, and the first single-pole double-throw relay is configured to be controlled by the controller to conduct or disconnect the electrical connection between the first blade and the second input terminal or the third input terminal;

[0013] A second single-pole double-throw relay, electrically connected to the controller, the second single-pole double-throw relay includes a third contact, a fourth contact, and a second blade, the third contact is electrically connected to the first input terminal, the fourth contact is electrically connected to the first blade, the second blade is electrically connected to the first output terminal, and the second single-pole double-throw relay is configured to be controlled by the controller to conduct or disconnect the electrical connection between the first output terminal and the first input terminal or the first blade.

[0014] Optionally, the second switch circuit includes a third single-pole double-throw relay;

[0015] The third single-pole double-throw relay is electrically connected to the controller, the third single-pole double-throw relay includes a fifth contact, a sixth contact, and a third blade, the fifth contact is electrically connected to the second input terminal, the sixth contact is electrically connected to the fourth input terminal, the third blade is electrically connected to the second output terminal, and the third single-pole double-throw relay is configured to be controlled by the controller to conduct or disconnect the electrical connection between the second output terminal and the second input terminal or the fourth input terminal.

[0016] Optionally, the output interface further includes a third output terminal and a fourth output terminal, and the switching circuit further includes a third switch circuit;

[0017] The third switch circuit is electrically connected to the controller, the second input terminal, the third input terminal, the third output terminal, and the fourth output terminal respectively, and is configured to be controlled by the controller to conduct or disconnect the electrical connection between the second input terminal and the third output terminal, and / or the electrical connection between the third input terminal and the fourth output terminal.

[0018] Optionally, the third switch circuit includes:

[0019] The first single-pole single-throw relay is electrically connected to the controller, the second input terminal, and the third output terminal respectively, and is configured to conduct or disconnect the electrical connection between the second input terminal and the third output terminal under the control of the controller;

[0020] The second single-pole single-throw relay is electrically connected to the controller, the third input terminal, and the fourth output terminal respectively, and is configured to conduct or disconnect the electrical connection between the third input terminal and the fourth output terminal under the control of the controller.

[0021] Optionally, the switching circuit further includes a fourth switching circuit;

[0022] The fourth switching circuit is electrically connected to the controller, the first switching circuit, the second switching circuit, the first output terminal, and the second output terminal respectively, and is configured to conduct or disconnect the electrical connection between the first switching circuit and the first output terminal, and / or the electrical connection between the second switching circuit and the second output terminal under the control of the controller.

[0023] Optionally, the switching circuit further includes a fifth switching circuit;

[0024] The fifth switching circuit is electrically connected to the controller, the first switching circuit, the second switching circuit, the third switching circuit, the first output terminal, the second output terminal, the third output terminal, and the fourth output terminal respectively, and is configured to conduct or disconnect the electrical connection between the first switching circuit and the first output terminal, the electrical connection between the second switching circuit and the second output terminal, and / or the electrical connection between the third switching circuit and the third output terminal, the fourth output terminal under the control of the controller.

[0025] Optionally, the fifth switching circuit includes a four-pole four-throw relay;

[0026] The four-pole four-throw relay is electrically connected to the controller. The four-pole four-throw relay includes a seventh contact, an eighth contact, a ninth contact, a tenth contact, a fourth pole, a fifth pole, a sixth pole, and a seventh pole. The seventh contact is electrically connected to the first switching circuit, the eighth contact and the ninth contact are electrically connected to the third switching circuit, the tenth contact is electrically connected to the second switching circuit, the fourth pole is electrically connected to the first output terminal, the fifth pole is electrically connected to the third output terminal, the sixth pole is electrically connected to the fourth output terminal, and the seventh pole is electrically connected to the second output terminal.

[0027] Optionally, the switching circuit further includes a sampling module;

[0028] The sampling module is electrically connected to the controller, the first input terminal, the second input terminal, the third input terminal, the fourth input terminal, the first output terminal and the second output terminal respectively, and is configured to sample the voltages and phase angles of the first input terminal, the second input terminal, the third input terminal, the fourth input terminal, the first output terminal and the second output terminal.

[0029] In a second aspect, an embodiment of the present invention provides a charging pile, including the switching circuit as described above.

[0030] The switching circuit provided by the embodiment of the present invention includes an input interface, an output interface, a first switching circuit, a second switching circuit and a controller. The input interface includes a first input terminal, a second input terminal, a third input terminal and a fourth input terminal. The first input terminal is configured to be electrically connected to the first-phase live wire, the second input terminal is configured to be electrically connected to the second-phase live wire, the third input terminal is configured to be electrically connected to the third-phase live wire, and the fourth input terminal is configured to be electrically connected to the neutral wire. The output interface includes a first output terminal and a second output terminal. The first output terminal and the second output terminal are configured to be electrically connected to an electric vehicle. The first switching circuit is configured to be electrically connected to the first input terminal, the second input terminal, the third input terminal and the first output terminal respectively. The second switching circuit is configured to be electrically connected to the second input terminal, the fourth input terminal and the second output terminal respectively. The controller is electrically connected to the first switching circuit and the second switching circuit respectively, and is configured to control the first switching circuit to conduct or disconnect the electrical connection between the first output terminal and the first input terminal, the second input terminal or the third input terminal, and control the second switching circuit to conduct or disconnect the electrical connection between the second output terminal and the second input terminal or the fourth input terminal. On the one hand, this embodiment can support dual-phase charging of an electric vehicle with any two-phase live wires under an IT power system. On the other hand, this embodiment also supports single-phase charging of an electric vehicle with any one-phase live wire under a TN power system / TT power system, which can not only improve the charging flexibility, but also achieve load balancing, improve the total power of the electricity provided by the charging station to the electric vehicle, and thus improve the utilization rate of the mains electricity. Description of the Drawings

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0032] Figure 1 It is a schematic structural diagram of a charging system provided by an embodiment of the present invention;

[0033] Figure 2A schematic structural diagram of a switching circuit provided by an embodiment of the present utility model;

[0034] Figure 3 A schematic diagram of an application scenario of the switching circuit provided by an embodiment of the present utility model;

[0035] Figure 4 A schematic diagram of another application scenario of the switching circuit provided by an embodiment of the present utility model;

[0036] Figure 5 A schematic diagram of yet another application scenario of the switching circuit provided by an embodiment of the present utility model;

[0037] Figure 6 A schematic diagram of yet another application scenario of the switching circuit provided by an embodiment of the present utility model;

[0038] Figure 7 A schematic diagram of yet another application scenario of the switching circuit provided by an embodiment of the present utility model;

[0039] Figure 8 A schematic diagram of yet another application scenario of the switching circuit provided by an embodiment of the present utility model;

[0040] Figure 9 A schematic structural diagram of a switching circuit provided by another embodiment of the present utility model;

[0041] Figure 10 A schematic diagram of yet another application scenario of the switching circuit provided by an embodiment of the present utility model;

[0042] Figure 11 A schematic diagram of yet another application scenario of the switching circuit provided by an embodiment of the present utility model;

[0043] Figure 12 A schematic structural diagram of a switching circuit provided by yet another embodiment of the present utility model;

[0044] Figure 13 A schematic structural diagram of a switching circuit provided by yet another embodiment of the present utility model;

[0045] Figure 14 A schematic structural diagram of a switching circuit provided by yet another embodiment of the present utility model;

[0046] Figure 15 A schematic structural diagram of a switching circuit provided by yet another embodiment of the present utility model;

[0047] Figure 16 A schematic structural diagram of a switching circuit provided by yet another embodiment of the present utility model;

[0048] Figure 17Another application scenario schematic diagram of the switching circuit provided by the embodiment of the present utility model. Detailed implementation manners

[0049] To facilitate the understanding of the present utility model, the present utility model will be described in more detail below with reference to the accompanying drawings and specific implementation manners. It should be noted that when an element is expressed as "connected" to another element, it can be directly connected to the other element, or there can be one or more intermediate elements therebetween. In addition, terms such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0050] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in this specification in the description of the present utility model are only for the purpose of describing specific implementation manners and are not used to limit the present utility model. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0051] The meanings of the various reference numerals in the accompanying drawings of the specification are as follows:

[0052] 100: Charging system; 10: Power grid; 20: Charging pile; 30: Electric vehicle; L1: First-phase live wire; L2: Second-phase live wire; L3: Third-phase live wire; N: Neutral wire; 21: Switching circuit; 211: Input interface; 212: Output interface; 213: First switch circuit; 214: Second switch circuit; 215: Controller; 216: Third switch circuit; 217: Fourth switch circuit; 218: Sampling module; 219: Alarm circuit; 210: Fifth switch circuit; 2111: First input terminal; 2112: Second input terminal; 2113: Third input terminal; 2114: Fourth input terminal; 2121: First output terminal; 2122: Second output terminal; 2123: Third output terminal; 2124: Fourth output terminal; K1: First single-pole double-throw relay; K2: Second single-pole double-throw relay; K3: Third single-pole double-throw relay; K4: First single-pole single-throw relay; K5: Second single-pole single-throw relay; K6: Second double-pole double-throw relay; K7: Four-pole four-throw relay.

[0053] The embodiment of the present utility model provides a charging system. Please refer to Figure 1 , the charging system 100 includes a power grid 10, a charging pile 20 and an electric vehicle 30.

[0054] The power grid 10 is a power network that transmits the commercial power to the charging pile 20 through transmission lines to supply power to the electric vehicle 30. Among them, the commercial power is industrial frequency alternating current, and the commercial power is characterized by three common quantities of alternating current, namely voltage, current and frequency. Generally, the commercial power transmitted by the power grid 10 to the charging pile 20 is three-phase alternating current, such as Figure 1 As shown, the power grid 10 and the charging pile 20 are electrically connected through four power lines, which are the first-phase live wire L1, the second-phase live wire L2, the third-phase live wire L3 and the neutral wire N respectively.

[0055] The charging pile 20 is a device used to charge the electric vehicle 30 to replenish the power of the electric vehicle 30. Its working principle is to receive electrical energy from the power grid and then transmit the electrical energy to the electric vehicle 30 through the charging line to realize charging the electric vehicle 30. The charging pile 20 can be any type of charging pile that supports AC charging, such as an AC charging pile, an AC-DC integrated charging pile, etc.

[0056] The AC charging pile is electrically connected to the external power grid and is used to provide power output to the electric vehicle 30 through a single or multiple 220VAC / 380VAC AC output interfaces, so that the electric vehicle 30 can use the on-board charger to charge the power battery of the electric vehicle 30. This charging method is also called "slow charging". The output power of the AC charging pile is generally 5kW (220VAC) / 20kW (380VAC), but the actual charging power is restricted by the on-board charger. Generally, the on-board charging power of small electric vehicles 30 is between 2 and 3kW.

[0057] The input voltage of the AC-DC integrated charging pile generally adopts three-phase four-wire 380VAC±15%, the frequency is 50Hz, and the DC output port outputs adjustable direct current to charge the power battery of the electric vehicle 30. The general charging power is 10-40kW, and the AC output port outputs 220VAC (5kW) / 380VAC (20kW) alternating current to provide a charging power source for the on-board charger of the electric vehicle 30. The AC-DC integrated charging pile can provide a conventional charging method through the AC output port and a fast charging method through the DC output port. It can use the fast charging method for fast charging when there are many charging services during the day, and can use the conventional charging method for slow charging when there are few users at the charging station at night. The AC-DC integrated charging pile can not only realize AC and DC simultaneous charging, but also realize interlock charging, and adopts a modular design, which is convenient for maintenance.

[0058] The electric vehicle 30 receives alternating current provided by the charging pile 20 through an on-vehicle charger, filters and rectifies the alternating current to obtain direct current, and then stores the direct current in the power battery of the electric vehicle 30, thereby charging the power battery of the electric vehicle 30. The electric vehicle 30 includes any vehicle that can be driven by electricity, including but not limited to pure electric vehicles, hybrid electric vehicles, fuel cell vehicles, etc.

[0059] In some embodiments, the charging pile 20 includes a switching circuit, and the switching circuit is used to select any one or more phases of the three-phase mains electricity according to actual needs to charge the electric vehicle 30. The switching circuit can support any type of grounding system, such as a TT power system, a TN power system, or an IT power system.

[0060] The grounding system is represented by two letter codes: TN, TT, and IT. The first letter represents the relationship between the power supply end and the ground: T means that there is a point on the power supply end directly grounded, and I means that all live parts of the power supply end are not grounded or there is a point grounded through an impedance. The second letter represents the relationship between the exposed conductive part of the electrical device and the ground: T means that the exposed conductive part of the electrical device is directly grounded, and this grounding point is electrically independent of the grounding point of the power supply end, and N means that the exposed conductive part of the electrical device has a direct electrical connection with the grounding of the power supply end.

[0061] The TT power system refers to a protective grounding system in which the metal shell of the electrical equipment is directly grounded. The first symbol T means that the neutral point of the power system is directly grounded, and the second symbol T means that the metal conductive part of the load device that is not connected to the live body is directly connected to the earth, regardless of how the system is grounded.

[0062] The TN power system is usually a three-phase power grid system with a grounded neutral point. Its characteristic is that the exposed conductive part of the electrical equipment is directly connected to the system grounding point. When a case-to-earth short circuit occurs, the short-circuit current forms a closed loop through the metal wire, forming a metallic single-phase short circuit, thereby generating a large enough short-circuit current to enable the protection device to operate reliably and cut off the fault. In the TN power system, the exposed conductive parts of all electrical equipment are connected to the protective wire and connected to the grounding point of the power supply, and this grounding point is usually the neutral point of the distribution system. When a fault makes the metal shell of the electrical equipment charged, a short circuit occurs between the phase wire and the ground wire. The loop resistance is small and the current is large, which can quickly fuse the fuse or cause the protection device to operate and cut off the power supply.

[0063] The IT power system is not directly connected to the ground, and the exposed conductive parts of the electrical installation are connected to the grounding electrode through the protective grounding wire. In the IT power system, the live conductors of the electrical installation are insulated from the ground or the neutral point of the power supply is grounded through a high impedance, and all the exposed conductive parts and the conductive parts outside the installation are grounded through the grounding electrode of the electrical installation. Since the fault current is small when the first fault occurs in the IT power system, the metal shell of the electrical equipment will not generate a dangerous touch voltage. Therefore, the power supply does not need to be cut off, and the electrical equipment can continue to operate. The fault can be eliminated through the alarm device and inspection. When the second fault occurs in the IT power system, the power supply should be automatically cut off, that is, when the second fault occurs on another phase line or the neutral line, the fault must be quickly removed.

[0064] In some embodiments, referring to Figure 2 , the switching circuit 21 includes an input interface 211, an output interface 212, a first switching circuit 213, a second switching circuit 214, and a controller 215.

[0065] The input interface 211 includes a first input terminal 2111, a second input terminal 2112, a third input terminal 2113, and a fourth input terminal 2114.

[0066] The first input terminal 2111 is configured to be electrically connected to the first-phase live wire L1 of the power grid 10, the second input terminal 2112 is configured to be electrically connected to the second-phase live wire L2 of the power grid 10, the third input terminal 2113 is configured to be electrically connected to the third-phase live wire L3 of the power grid 10, and the fourth input terminal 2114 is configured to be electrically connected to the neutral wire N of the power grid 10.

[0067] The output interface 212 includes a first output terminal 2121 and a second output terminal 2122.

[0068] Both the first output terminal 2121 and the second output terminal 2122 are configured to be electrically connected to the electric vehicle 30.

[0069] The first switching circuit 213 is configured to be electrically connected to the first input terminal 2111, the second input terminal 2112, the third input terminal 2113, and the first output terminal 2121 respectively. A path can be formed among the first input terminal 2111, the first switching circuit 213, and the first output terminal 2121. A path can also be formed among the second input terminal 2112, the first switching circuit 213, and the first output terminal 2121. A path can further be formed among the third input terminal 2113, the first switching circuit 213, and the first output terminal 2121. However, these three paths are not allowed to be formed simultaneously.

[0070] The second switch circuit 214 is configured to be electrically connected to the second input terminal 2112, the fourth input terminal 2114, and the second output terminal 2122 respectively. A path can be formed among the second input terminal 2112, the second switch circuit 214, and the second output terminal 2122, and a path can also be formed among the fourth input terminal 2114, the second switch circuit 214, and the second output terminal 2122. However, these two paths are not allowed to be formed simultaneously.

[0071] The controller 215 is electrically connected to the first switch circuit 213 and the second switch circuit 214 respectively, and is used to control the first switch circuit 213 to conduct or disconnect the electrical connection between the first output terminal 2121 and the first input terminal 2111, the second input terminal 2112, or the third input terminal 2113, and control the second switch circuit 214 to conduct or disconnect the electrical connection between the second output terminal 2122 and the second input terminal 2112 or the fourth input terminal 2114.

[0072] This embodiment can support an IT power system. To support the IT power system, it can be achieved by short - circuiting the first input terminal 2111, the second input terminal 2112, or the third input terminal 2113 to the fourth input terminal 2114. For example, short - circuiting the first input terminal 2111 to the fourth input terminal 2114, or short - circuiting the second input terminal 2112 to the fourth input terminal 2114, or short - circuiting the third input terminal 2113 to the fourth input terminal 2114.

[0073] For example, in the case where the third input terminal 2113 is short - circuited to the fourth input terminal 2114:

[0074] Please refer to Figure 3 , when the controller 215 controls the first switch circuit 213 to conduct the electrical connection between the first input terminal 2111 and the first output terminal 2121, disconnect the electrical connection between the second input terminal 2112 and the first output terminal 2121, and the electrical connection between the third input terminal 2113 and the first output terminal 2121, and controls the second switch circuit 214 to conduct the electrical connection between the second input terminal 2112 and the second output terminal 2122, disconnect the electrical connection between the fourth input terminal 2114 and the second output terminal 2122, it can achieve dual - phase charging of the electric vehicle 30 through the first - phase live wire L1 and the second - phase live wire L2 in the IT power system.

[0075] Please refer to Figure 4, when the controller 215 controls the first switch circuit 213 to conduct the electrical connection between the first input terminal 2111 and the first output terminal 2121, disconnect the electrical connection between the second input terminal 2112 and the first output terminal 2121, and the electrical connection between the third input terminal 2113 and the first output terminal 2121, and controls the second switch circuit 214 to conduct the electrical connection between the fourth input terminal 2114 and the second output terminal 2122, and disconnect the electrical connection between the second input terminal 2112 and the second output terminal 2122, it can achieve dual-phase charging of the electric vehicle 30 through the first-phase live wire L1 and the third-phase live wire L3 in the IT power system.

[0076] Please refer to Figure 5 , when the controller 215 controls the first switch circuit 213 to conduct the electrical connection between the second input terminal 2112 and the first output terminal 2121, disconnect the electrical connection between the first input terminal 2111 and the first output terminal 2121, and the electrical connection between the third input terminal 2113 and the first output terminal 2121, and controls the second switch circuit 214 to conduct the electrical connection between the fourth input terminal 2114 and the second output terminal 2122, and disconnect the electrical connection between the second input terminal 2112 and the second output terminal 2122, it can achieve dual-phase charging of the electric vehicle 30 through the second-phase live wire L2 and the third-phase live wire L3 in the IT power system.

[0077] For another example, in the case where the first input terminal 2111, the second input terminal 2112, or the third input terminal 2113 does not need to be short-circuited with the fourth input terminal 2114:

[0078] Please refer to Figure 6 , when the controller 215 controls the first switch circuit 213 to conduct the electrical connection between the first input terminal 2111 and the first output terminal 2121, disconnect the electrical connection between the second input terminal 2112 and the first output terminal 2121, and the electrical connection between the third input terminal 2113 and the first output terminal 2121, and controls the second switch circuit 214 to conduct the electrical connection between the fourth input terminal 2114 and the second output terminal 2122, and disconnect the electrical connection between the second input terminal 2112 and the second output terminal 2122, it can achieve single-phase charging of the electric vehicle 30 through the first-phase live wire L1 in the TT power system / TN power system.

[0079] Please refer to Figure 7, when the controller 215 controls the first switch circuit 213 to conduct the electrical connection between the second input terminal 2112 and the first output terminal 2121, disconnect the electrical connection between the first input terminal 2111 and the first output terminal 2121 and the electrical connection between the third input terminal 2113 and the first output terminal 2121, and controls the second switch circuit 214 to conduct the electrical connection between the fourth input terminal 2114 and the second output terminal 2122, and disconnect the electrical connection between the second input terminal 2112 and the second output terminal 2122, it is possible to achieve single-phase charging of the electric vehicle 30 through the second-phase live wire L2 in the TT power system / TN power system.

[0080] Please refer to Figure 8 , when the controller 215 controls the first switch circuit 213 to conduct the electrical connection between the third input terminal 2113 and the first output terminal 2121, disconnect the electrical connection between the first input terminal 2111 and the first output terminal 2121 and the electrical connection between the second input terminal 2112 and the first output terminal 2121, and controls the second switch circuit 214 to conduct the electrical connection between the fourth input terminal 2114 and the second output terminal 2122, and disconnect the electrical connection between the second input terminal 2112 and the second output terminal 2122, it is possible to achieve single-phase charging of the electric vehicle 30 through the third-phase live wire L3 in the TT power system / TN power system.

[0081] Therefore, this embodiment can not only support two-phase charging of the electric vehicle with any two-phase live wires in the IT power system, but also support single-phase charging of the electric vehicle with any one-phase live wire in the TT power system / TN power system, which can improve the charging flexibility, achieve load balancing, increase the total power of the electricity provided by the charging station to the electric vehicle, and thus improve the utilization rate of the mains electricity.

[0082] In some embodiments, please refer to Figure 9 , the output interface 212 further includes a third output terminal 2123 and a fourth output terminal 2124.

[0083] Both the third output terminal 2123 and the fourth output terminal 2124 are configured to be electrically connected to the electric vehicle 30

[0084] As Figure 9 shown, the switching circuit 21 further includes a third switch circuit 216.

[0085] The third switch circuit 216 is electrically connected to the controller 215, the second input terminal 2112, the third input terminal 2113, the third output terminal 2123 and the fourth output terminal 2124 respectively, and is used to be controlled by the controller 215 to conduct or disconnect the electrical connection between the second input terminal 2112 and the third output terminal 2123, and / or the electrical connection between the third input terminal 2113 and the fourth output terminal 2124.

[0086] For example, in the case where the third input terminal 2113 and the fourth input terminal 2114 are short-circuited:

[0087] Please refer to Figure 10 , when the controller 215 controls the first switch circuit 213 to conduct the electrical connection between the first input terminal 2111 and the first output terminal 2121, disconnect the electrical connections between the second input terminal 2112 and the first output terminal 2121 and between the third input terminal 2113 and the first output terminal 2121, control the second switch circuit 214 to disconnect the electrical connections between the fourth input terminal 2114 and the second output terminal 2122 and between the second input terminal 2112 and the second output terminal 2122, and control the third switch circuit 216 to conduct the electrical connections between the second input terminal 2112 and the third output terminal 2123 and between the third input terminal 2113 and the fourth output terminal 2124, three-phase charging of the electric vehicle 30 can be achieved through the first-phase live wire L1, the second-phase live wire L2, and the third-phase live wire L3 under the IT power system.

[0088] For another example, in the case where the first input terminal 2111, the second input terminal 2112, or the third input terminal 2113 does not need to be short-circuited with the fourth input terminal 2114:

[0089] Please refer to Figure 11 , when the controller 215 controls the first switch circuit 213 to conduct the electrical connection between the first input terminal 2111 and the first output terminal 2121, disconnect the electrical connections between the second input terminal 2112 and the first output terminal 2121 and between the third input terminal 2113 and the first output terminal 2121, control the second switch circuit 214 to conduct the electrical connection between the fourth input terminal 2114 and the second output terminal 2122, disconnect the electrical connection between the second input terminal 2112 and the second output terminal 2122, and control the third switch circuit 216 to conduct the electrical connections between the second input terminal 2112 and the third output terminal 2123 and between the third input terminal 2113 and the fourth output terminal 2124, three-phase charging of the electric vehicle 30 can be achieved through the first-phase live wire L1, the second-phase live wire L2, and the third-phase live wire L3 under the TT power system / TN power system.

[0090] Therefore, this embodiment can not only support three-phase charging of the electric vehicle by three-phase live wires under the IT power system, but also support three-phase charging of the electric vehicle by three-phase live wires under the TT power system / TN power system, which is beneficial to further improving the charging flexibility.

[0091] In some embodiments, please refer to Figure 12 , the switching circuit 21 further includes a fourth switch circuit 217.

[0092] The fourth switching circuit 217 is electrically connected to the controller 215, the first switching circuit 213, the second switching circuit 214, the first output terminal 2121, and the second output terminal 2122 respectively, and is used to conduct or disconnect the electrical connection between the first switching circuit 213 and the first output terminal 2121, and / or the electrical connection between the second switching circuit 214 and the second output terminal 2122 under the control of the controller 215.

[0093] The fourth switching circuit 217 is used to conduct the electrical connection between the first switching circuit 213 and the first output terminal 2121, and the electrical connection between the second switching circuit 214 and the second output terminal 2122 when power needs to be output through the first output terminal 2121 and the second output terminal 2122.

[0094] For example, please refer to Figure 3 , when charging the electric vehicle 30 through the first-phase live wire L1 and the second-phase live wire L2 in the IT power system, the controller 215 controls the first switching circuit 213 to conduct the electrical connection between the first input terminal 2111 and the first output terminal 2121, disconnect the electrical connection between the second input terminal 2112 and the first output terminal 2121, and the electrical connection between the third input terminal 2113 and the first output terminal 2121, controls the second switching circuit 214 to conduct the electrical connection between the second input terminal 2112 and the second output terminal 2122, disconnect the electrical connection between the fourth input terminal 2114 and the second output terminal 2122, and then controls the fourth switching circuit 217 to conduct the electrical connection between the first switching circuit 213 and the first output terminal 2121, and between the second switching circuit 214 and the second output terminal 2122, so as to improve the safety and reliability of the switching process.

[0095] In some embodiments, please refer to Figure 13 , the switching circuit 21 further includes a sampling module 218.

[0096] The sampling module 218 is electrically connected to the controller 215, the first input terminal 2111, the second input terminal 2112, the third input terminal 2113, the fourth input terminal 2114, the first output terminal 2121, and the second output terminal 2122 respectively, and is used to sample the voltages and phase angles of the first input terminal 2111, the second input terminal 2112, the third input terminal 2113, the fourth input terminal 2114, the first output terminal 2121, and the second output terminal 2122, so that the controller 215 can judge whether the current switching operation is correct according to these voltages and phase angles.

[0097] For example, please refer to again Figure 3, when charging the electric vehicle 30 through the first phase live wire L1 and the second phase live wire L2 under the IT power system, the controller 215 controls the first switch circuit 213 to conduct the electrical connection between the first input terminal 2111 and the first output terminal 2121, disconnect the electrical connection between the second input terminal 2112 and the first output terminal 2121, and the electrical connection between the third input terminal 2113 and the first output terminal 2121, and controls the second switch circuit 214 to conduct the electrical connection between the second input terminal 2112 and the second output terminal 2122, and disconnect the electrical connection between the fourth input terminal 2114 and the second output terminal 2122. If the voltages and phase angles of the first input terminal 2111 and the first output terminal 2121 are consistent, and the voltages and phase angles of the second input terminal 2112 and the second output terminal 2122 are also consistent, the controller 215 can determine that the current switching operation is correct; otherwise, it determines that the current switching operation is abnormal.

[0098] In some embodiments, as Figure 13 shown, the switching circuit 21 further includes an alarm circuit 219.

[0099] The alarm circuit 219 is electrically connected to the controller 215 and is used to give an alarm under the control of the controller 215. As described above, when the controller 215 determines that the current switching operation is abnormal, it can output a control signal to the alarm circuit 219, so that the alarm circuit 219 generates an alarm signal according to the control signal, thereby giving an alarm. It can be understood that the alarm signal includes but is not limited to text display, indicator light, sound, etc.

[0100] In some embodiments, please refer to Figure 14 , the switching circuit 21 further includes a fifth switch circuit 210.

[0101] The fifth switch circuit 210 is electrically connected to the controller 215, the first switch circuit 213, the second switch circuit 214, the third switch circuit 216, the first output terminal 2121, the second output terminal 2122, the third output terminal 2123, and the fourth output terminal 2124 respectively, and is used to conduct or disconnect the electrical connection between the first switch circuit 213 and the first output terminal 2121, the electrical connection between the second switch circuit 214 and the second output terminal 2122, and / or the electrical connection between the third switch circuit 216 and the third output terminal 2123 and the fourth output terminal 2124 under the control of the controller 215.

[0102] The fifth switching circuit 210 is used to conduct the electrical connection between the first switching circuit 213 and the first output terminal 2121, the electrical connection between the second switching circuit 214 and the second output terminal 2122, and the electrical connection between the third switching circuit 216 and the third output terminal 2123 and the fourth output terminal 2124 when power needs to be output through the first output terminal 2121, the second output terminal 2122, the third output terminal 2123, and the fourth output terminal 2124.

[0103] For example, please refer to Figure 11 , when three-phase charging of the electric vehicle 30 is performed through the first-phase live wire L1, the second-phase live wire L2, and the third-phase live wire L3 in a TT power system / TN power system, the controller 215 controls the first switching circuit 213 to conduct the electrical connection between the first input terminal 2111 and the first output terminal 2121, and disconnect the electrical connections between the second input terminal 2112 and the first output terminal 2121 and between the third input terminal 2113 and the first output terminal 2121. The controller 215 controls the second switching circuit 214 to conduct the electrical connection between the fourth input terminal 2114 and the second output terminal 2122, and disconnect the electrical connection between the second input terminal 2112 and the second output terminal 2122. After controlling the third switching circuit 216 to conduct the electrical connections between the second input terminal 2112 and the third output terminal 2123 and between the third input terminal 2113 and the fourth output terminal 2124, the controller 215 controls the fifth switching circuit 210 to conduct the electrical connection between the first switching circuit 213 and the first output terminal 2121, the electrical connection between the second switching circuit 214 and the second output terminal 2122, and the electrical connection between the third switching circuit 216 and the third output terminal 2123 and the fourth output terminal 2124. In this way, the safety and reliability of the switching process can be improved.

[0104] It can be understood that for Figure 10 the embodiment shown, the sampling module 218 can also be electrically connected to the third output terminal 2123 and the fourth output terminal 2124 respectively, for the voltages and phase angles of the third output terminal 2123 and the fourth output terminal 2124, so that the controller 215 can judge whether the current switching operation is correct according to the voltages and phase angles of the corresponding ports.

[0105] In some embodiments, please refer to Figure 15 , the first switching circuit 213 includes a first single-pole double-throw relay K1 and a second single-pole double-throw relay K2.

[0106] The first single-pole double-throw relay K1 is electrically connected to the controller 215. The first single-pole double-throw relay K1 includes a first contact, a second contact, and a first pole. The first contact is electrically connected to the second input terminal 2112, the second contact is electrically connected to the third input terminal 2113, and the first single-pole double-throw relay K1 is used to conduct or disconnect the electrical connection between the first pole and the second input terminal 2112 or the third input terminal 2113 under the control of the controller 215.

[0107] The second single-pole double-throw relay K2 is electrically connected to the controller 215. The second single-pole double-throw relay K2 includes a third contact, a fourth contact, and a second pole. The third contact is electrically connected to the first input terminal 2111, the fourth contact is electrically connected to the first pole, and the second pole is electrically connected to the first output terminal 2121. The second single-pole double-throw relay K2 is used to conduct or disconnect the electrical connection between the first output terminal 2121 and the first input terminal 2111 or the first pole under the control of the controller 215.

[0108] For example, please refer to Figure 3 , when charging the electric vehicle 30 through the first-phase live wire L1 and the second-phase live wire L2 under the IT power system, the controller 215 controls the second pole of the second single-pole double-throw relay K2 to contact the third contact to conduct the electrical connection between the first output terminal 2121 and the first input terminal 2111.

[0109] For another example, please refer to Figure 5 , when charging the electric vehicle 30 through the second-phase live wire L2 and the third-phase live wire L3 under the IT power system, the controller 215 controls the first pole of the first single-pole double-throw relay K1 to contact the first contact to conduct the electrical connection between the first pole and the second input terminal 2112, and controls the second pole of the second single-pole double-throw relay K2 to contact the fourth contact to conduct the electrical connection between the first pole and the first output terminal 2121, thereby conducting the electrical connection between the second input terminal 2112 and the first output terminal 2121.

[0110] It can be understood that since the single-pole double-throw relay can form at most one path at any time and will not form two paths simultaneously, when the controller 215 controls the first pole to contact the first contact, a path is formed among the first input terminal 2111, the first single-pole double-throw relay K1, and the first pole, while a path will not be formed among the second input terminal 2111, the first single-pole double-throw relay K1, and the first pole. When the controller controls the second pole to contact the fourth contact, a path is formed among the first pole, the second single-pole double-throw relay K2, and the first output terminal 2121, while a path will not be formed among the first pole, the second single-pole double-throw relay K2, and the first output terminal 2121. Since the first output terminal 2121 can only form a path with the first input terminal 2111, the second input terminal 2112, or the third input terminal 2113, and there will be no situation where the first output terminal 2121 forms a path with two or three input terminals, therefore, this embodiment can achieve hardware interlock without the need to additionally introduce an interlock circuit.

[0111] In some embodiments, the first switch circuit 213 can also be implemented in any other suitable alternative manner to achieve the same function. For example, the first switch circuit 213 includes a third single-pole single-throw relay, a fourth single-pole single-throw relay, and a fifth single-pole single-throw relay. The third single-pole single-throw relay is electrically connected to the controller 215, the first input terminal 2111, and the first output terminal 2121 respectively, and is used to conduct or disconnect the electrical connection between the first input terminal 2111 and the first output terminal 2121 under the control of the controller 215. The fourth single-pole single-throw relay is electrically connected to the controller 215, the second input terminal 2112, and the first output terminal 2121 respectively, and is used to conduct or disconnect the electrical connection between the second input terminal 2112 and the first output terminal 2121 under the control of the controller 215. The fifth single-pole single-throw relay is electrically connected to the controller 215, the third input terminal 2113, and the first output terminal 2121 respectively, and is used to conduct or disconnect the electrical connection between the third input terminal 2113 and the first output terminal 2121 under the control of the controller 215. When it is necessary to conduct the first output terminal 2121 with any one of the first input terminal 2111, the second input terminal 2112, and the third input terminal 2113, the controller 215 only needs to control the corresponding single-pole single-throw relay to conduct.

[0112] In some embodiments, please continue to refer to Figure 15 , the second switch circuit 214 includes a third single-pole double-throw relay K3.

[0113] The third single-pole double-throw relay K3 is electrically connected to the controller 215. The third single-pole double-throw relay K3 includes a fifth contact, a sixth contact and a third blade. The fifth contact is electrically connected to the second input terminal 2112, the sixth contact is electrically connected to the fourth input terminal 2114, and the third blade is electrically connected to the second output terminal 2122. The third single-pole double-throw relay K3 is used to control the conduction or disconnection of the electrical connection between the second output terminal 2122 and the second input terminal 2112 or the fourth input terminal 2114 under the control of the controller 215.

[0114] For example, please refer to Figure 3 , when charging the electric vehicle 30 through the first-phase live wire L1 and the second-phase live wire L2 in the IT power system, the controller 215 controls the fifth contact of the third single-pole double-throw relay K3 to contact the third blade, thereby conducting the electrical connection between the second output terminal 2122 and the second input terminal 2112 and disconnecting the electrical connection between the second output terminal 2122 and the fourth input terminal 2114.

[0115] For another example, please refer to Figure 4 , when charging the electric vehicle 30 through the first-phase live wire L1 and the third-phase live wire L3 in the IT power system, the controller 215 controls the sixth contact of the third single-pole double-throw relay K3 to contact the third blade, thereby conducting the electrical connection between the second output terminal 2122 and the fourth input terminal 2114 and disconnecting the electrical connection between the second output terminal 2122 and the second input terminal 2112.

[0116] As described above, since the single-pole double-throw relay can form at most one path at any time and will not form two paths, therefore, this embodiment can achieve hardware interlock without additionally introducing an interlock circuit.

[0117] In some embodiments, the second switch circuit 214 can also be implemented in any other suitable alternative way to achieve the same function. For example, the second switch circuit 214 includes a sixth single-pole single-throw relay and a seventh single-pole single-throw relay. The sixth single-pole single-throw relay is electrically connected to the controller 215, the second input terminal 2112 and the second output terminal 2121 respectively, and is used to control the conduction or disconnection of the electrical connection between the second input terminal 2112 and the second output terminal 2122 under the control of the controller 215. The seventh single-pole single-throw relay is electrically connected to the controller 215, the fourth input terminal 2114 and the second output terminal 2121 respectively, and is used to control the conduction or disconnection of the electrical connection between the fourth input terminal 2114 and the second output terminal 2122 under the control of the controller 215. When it is necessary to conduct the second output terminal 2122 with any one of the second input terminal 2112 and the fourth input terminal 2114, the controller 215 only needs to control the corresponding single-pole single-throw relay to conduct.

[0118] In some embodiments, please refer to Figure 16, the third switch circuit 216 includes a first single-pole single-throw relay K4 and a second single-pole single-throw relay K5.

[0119] The first single-pole single-throw relay K4 is electrically connected to the controller 215, the second input terminal 2112, and the third output terminal 2123 respectively, and is used to conduct or disconnect the electrical connection between the second input terminal 2112 and the third output terminal 2123 under the control of the controller 215.

[0120] The second single-pole single-throw relay K5 is electrically connected to the controller 215, the third input terminal 2113, and the fourth output terminal 2124 respectively, and is used to conduct or disconnect the electrical connection between the third input terminal 2113 and the fourth output terminal 2124 under the control of the controller 215.

[0121] For example, please combine Figure 10 , when the electric vehicle 30 is charged in three phases through the first-phase live wire L1, the second-phase live wire L2, and the third-phase live wire L3 in the IT power system, the controller 215 controls the first single-pole single-throw relay K4 and the second single-pole single-throw relay K5 to conduct, so as to conduct the electrical connection between the second input terminal 2112 and the third output terminal 2123, and between the third input terminal 2113 and the fourth output terminal 2124.

[0122] For example, please combine Figure 3 , when the electric vehicle 30 is charged in two phases through the first-phase live wire L1 and the second-phase live wire L2 in the IT power system, the controller 215 controls the first single-pole single-throw relay K4 and the second single-pole single-throw relay K5 to disconnect, so as to disconnect the electrical connection between the second input terminal 2112 and the third output terminal 2123, and between the third input terminal 2113 and the fourth output terminal 2124.

[0123] In some embodiments, the third switch circuit 216 can also be implemented in any other suitable alternative manner to achieve the same function. For example, the third switch circuit 216 includes a first double-pole double-throw relay. The first double-pole double-throw relay is electrically connected to the controller 215. The first double-pole double-throw relay includes an eleventh contact, a twelfth contact, an eighth blade, and a ninth blade. The eleventh contact is electrically connected to the second input terminal 2112, the twelfth contact is electrically connected to the third input terminal 2113, the eighth blade is electrically connected to the third output terminal 2123, and the ninth blade is electrically connected to the fourth output terminal 2124. When it is necessary to conduct the electrical connection between the second input terminal 2112 and the third output terminal 2123, and between the third input terminal 2113 and the fourth output terminal 2124, the controller 215 controls the first double-pole double-throw relay to conduct. When it is necessary to disconnect the electrical connection between the second input terminal 2112 and the third output terminal 2123, and between the third input terminal 2113 and the fourth output terminal 2124, the controller 215 controls the first double-pole double-throw relay to disconnect.

[0124] In some embodiments, referring still to Figure 15 , the fourth switch circuit 217 includes a second double-pole double-throw relay K6.

[0125] The second double-pole double-throw relay K6 is electrically connected to the controller 215. The second double-pole double-throw relay K6 includes a thirteenth contact, a fourteenth contact, a tenth pole, and an eleventh pole. The thirteenth contact is electrically connected to the first switch circuit 213, the fourteenth contact is electrically connected to the second switch circuit 214, the tenth pole is electrically connected to the first output terminal 2121, and the eleventh pole is electrically connected to the second output terminal 2122.

[0126] When it is necessary to conduct the electrical connections between the first switch circuit 213 and the first output terminal 2121, and between the second switch circuit 214 and the second output terminal 2122, the controller 215 controls the second double-pole double-throw relay K6 to conduct. When it is necessary to disconnect the electrical connections between the first switch circuit 213 and the first output terminal 2121, and between the second switch circuit 214 and the second output terminal 2122, the controller 215 controls the second double-pole double-throw relay K6 to disconnect.

[0127] In some embodiments, the fourth switch circuit 217 can also be implemented in any other suitable alternative manner to achieve the same function. For example, the fourth switch circuit 217 includes a seventh single-pole single-throw relay and an eighth single-pole single-throw relay. The seventh single-pole single-throw relay is electrically connected to the controller 215, the second input terminal 2112, and the third output terminal 2123 respectively, and is used to conduct or disconnect the electrical connection between the second input terminal 2112 and the third output terminal 2123 under the control of the controller 215. The eighth single-pole single-throw relay is electrically connected to the controller 215, the third input terminal 2113, and the fourth output terminal 2124 respectively, and is used to conduct or disconnect the electrical connection between the third input terminal 2113 and the fourth output terminal 2124 under the control of the controller 215.

[0128] When it is necessary to conduct the electrical connections between the first switch circuit 213 and the first output terminal 2121, and between the second switch circuit 214 and the second output terminal 2122, the controller 215 controls both the seventh single-pole single-throw relay and the eighth single-pole single-throw relay to conduct. When it is necessary to disconnect the electrical connections between the first switch circuit 213 and the first output terminal 2121, and between the second switch circuit 214 and the second output terminal 2122, the controller 215 controls both the seventh single-pole single-throw relay and the eighth single-pole single-throw relay to disconnect.

[0129] In some embodiments, referring still to Figure 16 , the fifth switch circuit 210 includes a four-pole four-throw relay K7.

[0130] The four-pole four-throw relay K7 is electrically connected to the controller 215. The four-pole four-throw relay K7 includes a seventh contact, an eighth contact, a ninth contact, a tenth contact, a fourth pole, a fifth pole, a sixth pole, and a seventh pole. The seventh contact is electrically connected to the first switch circuit 213, the eighth contact and the ninth contact are electrically connected to the third switch circuit 216, the tenth contact is electrically connected to the second switch circuit 214, the fourth pole is electrically connected to the first output terminal 2121, the fifth pole is electrically connected to the third output terminal 2123, the sixth pole is electrically connected to the fourth output terminal 2124, and the seventh pole is electrically connected to the second output terminal 2122.

[0131] When it is necessary to conduct the electrical connection between the first switch circuit 213 and the first output terminal 2121, the electrical connection between the second switch circuit 214 and the second output terminal 2122, the electrical connection between the third switch circuit 216 and the third output terminal 2123, and the electrical connection between the fourth output terminal 2124, the controller 215 can control the four-pole four-throw relay K7 to conduct. When it is necessary to disconnect the electrical connection between the first switch circuit 213 and the first output terminal 2121, the electrical connection between the second switch circuit 214 and the second output terminal 2122, the electrical connection between the third switch circuit 216 and the third output terminal 2123, and the electrical connection between the fourth output terminal 2124, the controller 215 can control the four-pole four-throw relay K7 to disconnect.

[0132] For example, please refer to Figure 17 , when the electric vehicle 30 is charged in a two-phase manner through the first-phase live wire L1 and the second-phase live wire L2 under the IT power system, the controller 215 controls the first switch circuit 213 to conduct the electrical connection between the first input terminal 2111 and the first output terminal 2121, disconnect the electrical connection between the second input terminal 2112 and the first output terminal 2121, and the electrical connection between the third input terminal 2113 and the first output terminal 2121, and controls the second switch circuit 214 to conduct the electrical connection between the second input terminal 2112 and the second output terminal 2122, disconnect the electrical connection between the fourth input terminal 2114 and the second output terminal 2122, and then controls the four-pole four-throw relay K7 to conduct.

[0133] In some embodiments, the fifth switch circuit 210 may also be implemented in any other suitable alternative manner to achieve the same function. For example, the fifth switch circuit 210 includes a third double-pole double-throw relay and a fourth double-pole double-throw relay. Both the third double-pole double-throw relay and the fourth double-pole double-throw relay are electrically connected to the controller. The third double-pole double-throw relay includes a fifteenth contact, a sixteenth contact, a twelfth knife, and a thirteenth knife. The fifteenth contact is electrically connected to the first switch circuit 213, the sixteenth contact is electrically connected to the second switch circuit 214, the twelfth knife is electrically connected to the first output terminal 2121, and the thirteenth knife is electrically connected to the second output terminal 2122. The third double-pole double-throw relay is used to conduct or disconnect the electrical connection between the first switch circuit 213 and the first output terminal 2121, and between the second switch circuit 214 and the second output terminal 2122 under the control of the controller 215. The fourth double-pole double-throw relay includes a seventeenth contact, an eighteenth contact, a fourteenth knife, and a fifteenth knife. The seventeenth contact and the eighteenth contact are electrically connected to the third switch circuit 216, the fourteenth knife is electrically connected to the third output terminal 2123, and the fifteenth knife is electrically connected to the fourth output terminal 2124. The fourth double-pole double-throw relay is used to conduct or disconnect the electrical connection between the third switch circuit 216 and the third output terminal 2123, and the fourth output terminal 2124 under the control of the controller 215.

[0134] When it is necessary to conduct the electrical connection between the first switch circuit 213 and the first output terminal 2121, between the second switch circuit 214 and the second output terminal 2122, and between the third switch circuit 216 and the third output terminal 2123, and the fourth output terminal 2124, the controller 215 can respectively control the third double-pole double-throw relay and the fourth double-pole double-throw relay to conduct. When it is necessary to disconnect the electrical connection between the first switch circuit 213 and the first output terminal 2121, between the second switch circuit 214 and the second output terminal 2122, and between the third switch circuit 216 and the third output terminal 2123, and the fourth output terminal 2124, the controller 215 can respectively control the third double-pole double-throw relay and the fourth double-pole double-throw relay to disconnect.

[0135] For another example, the fifth switch circuit 210 includes a ninth single-pole single-throw relay, a tenth single-pole single-throw relay, an eleventh single-pole single-throw relay, and a twelfth single-pole single-throw relay. The ninth single-pole single-throw relay is electrically connected to the controller 215, the first switch circuit 213, and the first output terminal 2121 respectively, and is used to conduct or disconnect the electrical connection between the first switch circuit 213 and the first output terminal 2121 under the control of the controller 215. The tenth single-pole single-throw relay is electrically connected to the controller 215, the second switch circuit 214, and the second output terminal 2122 respectively, and is used to conduct or disconnect the electrical connection between the second switch circuit 214 and the second output terminal 2122 under the control of the controller 215. The eleventh single-pole single-throw relay is electrically connected to the controller 215, the third switch circuit 216, and the third output terminal 2123 respectively, and is used to conduct or disconnect the electrical connection between the third switch circuit 216 and the third output terminal 2123 under the control of the controller 215. The twelfth single-pole single-throw relay is electrically connected to the controller 215, the third switch circuit 216, and the fourth output terminal 2124 respectively, and is used to conduct or disconnect the electrical connection between the second switch circuit 214 and the fourth output terminal 2124 under the control of the controller 215.

[0136] When it is necessary to conduct the electrical connections between the first switch circuit 213 and the first output terminal 2121, between the second switch circuit 214 and the second output terminal 2122, between the third switch circuit 216 and the third output terminal 2123, and between the third switch circuit 216 and the fourth output terminal 2124, the controller 215 can respectively control the ninth single-pole single-throw relay, the tenth single-pole single-throw relay, the eleventh single-pole single-throw relay, and the twelfth single-pole single-throw relay to conduct. When it is necessary to disconnect the electrical connections between the first switch circuit 213 and the first output terminal 2121, between the second switch circuit 214 and the second output terminal 2122, between the third switch circuit 216 and the third output terminal 2123, and between the third switch circuit 216 and the fourth output terminal 2124, the controller 215 can respectively control the ninth single-pole single-throw relay, the tenth single-pole single-throw relay, the eleventh single-pole single-throw relay, and the twelfth single-pole single-throw relay to disconnect.

[0137] Finally, it should be noted that the present utility model can be implemented in many different forms and is not limited to the embodiments described in this specification. These embodiments do not serve as additional limitations to the content of the present utility model. The purpose of providing these embodiments is to make the understanding of the disclosed content of the present utility model more thorough and comprehensive. And under the idea of the present utility model, the above technical features continue to be combined with each other, and there are many other variations in different aspects of the present utility model as described above, all of which are regarded as within the scope described in the specification of the present utility model; further, for those of ordinary skill in the art, improvements or transformations can be made according to the above description, and all such improvements and transformations should fall within the protection scope of the appended claims of the present utility model.

Claims

1. A switching circuit, characterized in that: include: An input interface, comprising a first input terminal, a second input terminal, a third input terminal and a fourth input terminal, wherein the first input terminal is configured to be electrically connected to a first-phase live wire, the second input terminal is configured to be electrically connected to a second-phase live wire, the third input terminal is configured to be electrically connected to a third-phase live wire, and the fourth input terminal is configured to be electrically connected to a neutral wire; An output interface, comprising a first output end and a second output end, wherein the first output end and the second output end are configured to be electrically connected to an electric vehicle; A first switch circuit is configured to be electrically connected to the first input terminal, the second input terminal, the third input terminal and the first output terminal respectively; A second switch circuit is configured to be electrically connected to the second input terminal, the fourth input terminal and the second output terminal respectively; A controller is electrically connected to the first switch circuit and the second switch circuit, respectively, and is used to control the first switch circuit to turn on or off the electrical connection between the first output terminal and the first input terminal, the second input terminal or the third input terminal, and to control the second switch circuit to turn on or off the electrical connection between the second output terminal and the second input terminal or the fourth input terminal.

2. The switching circuit according to claim 1, characterized in that: The first switch circuit comprises: A first single-pole double-throw relay is electrically connected to the controller, the first single-pole double-throw relay comprises a first contact, a second contact and a first pole, the first contact is electrically connected to the second input terminal, the second contact is electrically connected to the third input terminal, and the first single-pole double-throw relay is used to be controlled by the controller to conduct or disconnect the electrical connection between the first pole and the second input terminal or the third input terminal; A second single-pole double-throw relay is electrically connected to the controller, the second single-pole double-throw relay includes a third contact, a fourth contact and a second pole, the third contact is electrically connected to the first input end, the fourth contact is electrically connected to the first pole, the second pole is electrically connected to the first output end, and the second single-pole double-throw relay is used to be controlled by the controller to turn on or off the electrical connection between the first output end and the first input end or the first pole.

3. The switching circuit according to claim 1, characterized in that: The second switch circuit includes a third single-pole double-throw relay; The third single-pole double-throw relay is electrically connected to the controller, and the third single-pole double-throw relay includes a fifth contact, a sixth contact and a third pole, the fifth contact is electrically connected to the second input terminal, the sixth contact is electrically connected to the fourth input terminal, and the third pole is electrically connected to the second output terminal. The third single-pole double-throw relay is used to be controlled by the controller to turn on or off the electrical connection between the second output terminal and the second input terminal or the fourth input terminal.

4. The switching circuit according to claim 1, characterized in that: The output interface further includes a third output terminal and a fourth output terminal, and the switching circuit further includes a third switch circuit; The third switch circuit is electrically connected to the controller, the second input terminal, the third input terminal, the third output terminal and the fourth output terminal, respectively, and is used to be controlled by the controller to turn on or off the electrical connection between the second input terminal and the third output terminal, and / or the electrical connection between the third input terminal and the fourth output terminal.

5. The switching circuit according to claim 4, characterized in that: The third switch circuit comprises: a first single-pole single-throw relay, electrically connected to the controller, the second input terminal and the third output terminal respectively, and used for being controlled by the controller to switch on or off the electrical connection between the second input terminal and the third output terminal; The second single-pole single-throw relay is electrically connected to the controller, the third input terminal and the fourth output terminal respectively, and is used for being controlled by the controller to switch on or off the electrical connection between the third input terminal and the fourth output terminal.

6. The switching circuit according to claim 1, characterized in that: The switching circuit further includes a fourth switch circuit; The fourth switch circuit is electrically connected to the controller, the first switch circuit, the second switch circuit, the first output end and the second output end, respectively, and is used to be controlled by the controller to turn on or off the electrical connection between the first switch circuit and the first output end, and / or the electrical connection between the second switch circuit and the second output end.

7. The switching circuit according to claim 4, characterized in that: The switching circuit further includes a fifth switch circuit; The fifth switch circuit is electrically connected to the controller, the first switch circuit, the second switch circuit, the third switch circuit, the first output end, the second output end, the third output end and the fourth output end, respectively, and is used to be controlled by the controller to turn on or off the electrical connection between the first switch circuit and the first output end, the electrical connection between the second switch circuit and the second output end, and / or the electrical connection between the third switch circuit and the third output end and the fourth output end.

8. The switching circuit according to claim 7, characterized in that: The fifth switch circuit includes a four-pole four-throw relay; The four-pole four-throw relay is electrically connected to the controller, and the four-pole four-throw relay includes a seventh contact, an eighth contact, a ninth contact, a tenth contact, a fourth knife, a fifth knife, a sixth knife and a seventh knife. The seventh contact is electrically connected to the first switch circuit, the eighth contact and the ninth contact are electrically connected to the third switch circuit, the tenth contact is electrically connected to the second switch circuit, the fourth knife is electrically connected to the first output end, the fifth knife is electrically connected to the third output end, the sixth knife is electrically connected to the fourth output end, and the seventh knife is electrically connected to the second output end.

9. The switching circuit according to claim 1, characterized in that: The switching circuit also includes a sampling module; The sampling module is electrically connected to the controller, the first input terminal, the second input terminal, the third input terminal, the fourth input terminal, the first output terminal and the second output terminal, respectively, and is used to sample the voltage and phase angle of the first input terminal, the second input terminal, the third input terminal, the fourth input terminal, the first output terminal and the second output terminal.

10. A charging pile, characterized in that: Comprising the switching circuit as claimed in any one of claims 1 to 9.

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