A multi-terminal charging guidance multiplexing circuit, detection device and charging system

Abstract

The application discloses a multi-terminal charging guide multiplexing circuit, a detection device and a charging system, which comprise a ground guide module, a first electric control switch, a plurality of second electric control switches and a plurality of third electric control switches. The first electric control switch, the second electric control switch and the third electric control switch are synchronous switches; if the first electric control switch, the second electric control switch and the third electric control switch are all in a normally closed state, a first terminal is in a working state, and a running interlocking passage in a second terminal is in a conductive state; if the first electric control switch, the second electric control switch and the third electric control switch are all in a normally open state, the second terminal is in a working state, and the running interlocking passage in the first terminal is in a conductive state. The technical problem that when a plurality of terminals are arranged on a charging pile, a terminal connected to an electric vehicle and not performing charging cannot trigger a running interlocking is solved.

Description

Technical Field

[0001] This application relates to the field of new energy vehicle charging technology, and in particular to a multi-terminal charging guidance multiplexing circuit, a detection device, and a charging system. Background Technology

[0002] During the charging process of electric vehicles, the charging station is generally equipped with a guiding circuit. The function of this guiding circuit is to ensure that the electric vehicle and the charging station conduct a "safe handshake" and "charging protocol dialogue" before providing current to the electric vehicle.

[0003] The safety handshake refers to the process of confirming the connection of the connection confirmation loop in the guidance circuit and controlling the connection of the guidance circuit before charging begins, thereby confirming the safety and establishing a connection between the charging gun in the charging pile and the electric vehicle. The charging protocol dialogue refers to the communication between the electric vehicle and the control guidance signal and the communication bus during the charging process to manage the charging process and optimize power transfer.

[0004] It is worth noting that during the charging process of an electric vehicle, after the charging gun is inserted into the vehicle, a driving interlock safety measure needs to be triggered to ensure the safe and orderly progress of the charging process. This means that during charging, the vehicle cannot be driven, and the charging gun cannot be removed, thus absolutely guaranteeing charging safety.

[0005] When a charging station has multiple terminals (i.e., multiple charging guns), but only one terminal can provide power to electric vehicles, if all terminals are plugged into electric vehicles, and one terminal is charging an electric vehicle, the other electric vehicles connected to charging guns will be in an uncharging state. Because of this, uncharging electric vehicles may not accurately recognize the connected charging guns, resulting in a situation where the driving interlock is not triggered, leaving the electric vehicles in a state where they can still be driven normally, posing a safety hazard.

[0006] The above content is only used to help understand the technical solution of this application and does not represent an admission that the above content is prior art. Utility Model Content

[0007] The main purpose of this application is to provide a multi-terminal charging guidance multiplexing circuit, detection device and charging system, which aims to solve the technical problem that when multiple terminals are set on a charging pile, the terminal connected to the electric vehicle but not charging cannot trigger the driving interlock.

[0008] To achieve the above objectives, this application provides a multi-terminal charging guidance multiplexing circuit, including: a grounding guidance module, Multiple second electronic control switches, multiple third electronic control switches, multiple first terminals connected to each second electronic control switch, and multiple second terminals connected to each third electronic control switch.

[0009] The driving interlock path of the first terminal is connected to the common terminal of the second electronic control switch. The first contact of the second electronic control switch is connected to the first contact of the first electronic control switch. The common terminal of the first electronic control switch is connected to the first terminal of the grounding guide module. The second contact of the second electronic control switch is connected to the second terminal of the grounding guide module. The first and second electronic control switches are used to control the driving interlock path in the first terminal to be in a conducting state.

[0010] The driving interlock path of the second terminal is connected to the common terminal of the third electronic control switch. The first contact of the third electronic control switch is connected to the second terminal of the grounding guide module. The second contact of the third electronic control switch is connected to the second contact of the first electronic control switch. The first and third electronic control switches are used to control the driving interlock path in the second terminal to be in the conducting state.

[0011] Among them, the first, second and third electronic control switches are synchronous switches.

[0012] Optionally, when one terminal is in a charging state, the remaining terminals are in a non-charging state, and the driving interlock path in each terminal is in a conducting state.

[0013] Optionally, the grounding guide module includes: a first grounding point, a second grounding point, a first variable resistor, a second resistor, and a fourth electronically controlled switch.

[0014] The first end of the first variable resistor is connected to the first grounding point, and the second end is connected to the first contact of the fourth electronic control switch. The common end of the fourth electronic control switch serves as the first end of the grounding guide module.

[0015] The first end of the second resistor is connected to the second grounding point, and the second end is connected to the second contact of the fourth electronic control switch. The second end of the second resistor serves as the second end of the grounding guide module.

[0016] Optionally, the multi-terminal charging guidance multiplexing circuit also includes a third variable resistor, a fourth variable resistor, a first switch, and multiple fifth electronically controlled switches.

[0017] One end of the third variable resistor is connected to the set voltage, and the other end is connected to one end of the first switch. The other end of the first switch is connected to the common terminal of each of the fifth electronic control switches. The fourth variable resistor is connected in parallel across the two ends of the first switch.

[0018] The first contact of each fifth electrical control switch is connected to the connection confirmation terminal of each first terminal, and the second contact is connected to the connection confirmation terminal of each second terminal.

[0019] The fifth electronic control switch is used to control the confirmation connection circuit of the first terminal or the confirmation connection circuit of the second terminal to be in the on state.

[0020] Optionally, the multi-terminal charging guidance multiplexing circuit also includes multiple sixth electronic control switches, multiple seventh electronic control switches, multiple eighth electronic control switches, and multiple ninth electronic control switches.

[0021] The common terminal of each sixth electrical control switch is connected to the first guiding signal terminal, the first contact is connected to the first control signal terminal of each first terminal, and the second contact is connected to the first control signal terminal of each second terminal.

[0022] The common terminal of each seventh electronic control switch is connected to the second guide signal terminal, the first contact is connected to the second control signal terminal of each first terminal, and the second contact is connected to the second control signal terminal of each second terminal.

[0023] The common terminal of each of the eighth electronic control switches is connected to the first terminal of the auxiliary power supply, the first contact is connected to the first DC signal terminal of each of the first terminals, and the second contact is connected to the first DC signal terminal of the second terminal.

[0024] The common terminal of each ninth electronic control switch is connected to the second terminal of the auxiliary power supply, the first contact is connected to the second DC signal terminal of each first terminal, and the second contact is connected to the second DC signal terminal of the second terminal.

[0025] Optionally, the driving interlock path in each terminal is connected to the second grounding point through the second resistor, so that the driving interlock path in each terminal is in the conducting state; wherein, the second resistor is used for series voltage division.

[0026] In addition, this application also provides a multi-terminal charging detection device, characterized in that it includes the multi-terminal charging guidance multiplexing circuit of the first aspect and any of its optional embodiments described above; and a plurality of first terminals, a plurality of second terminals and a DC charging circuit.

[0027] Each first terminal is connected to the output terminal of the multi-terminal charging guidance multiplexing circuit and to the power output terminal of the DC charging circuit. Each second terminal is connected to the output terminal of the multi-terminal charging guidance multiplexing circuit and to the power output terminal of the DC charging circuit.

[0028] Each first terminal and each second terminal are used to provide power to the corresponding connected electric vehicles.

[0029] In addition, this application also provides a charging system, including at least two power modules, a controller, a power distribution device, and at least one charging interface; the power distribution device includes the multi-terminal charging guidance multiplexing circuit described in the first aspect and any of its alternatives.

[0030] The power distribution device is connected to the controller, each power module, and each charging interface respectively. The power module is used to convert the AC power from the grid into DC power and supply it to the charging interface. The controller is used to obtain the power demand of each charging interface and generate scheduling instructions according to the connection relationship of the controllable switches in the power distribution device and the power demand. The power distribution device is used to control the opening or closing of the controllable switches according to the scheduling instructions to distribute the output power of each power module to each charging interface.

[0031] The multi-terminal charging guidance multiplexing circuit provided in this application can be applied to charging piles with multiple terminals. The function of the guidance multiplexing circuit is to ensure that the electric vehicle charging process can proceed safely and orderly. When a charging pile includes multiple terminals, and each terminal is plugged into an electric vehicle charging interface, if only one terminal is charging, it ensures that the other terminals trigger the electric vehicle's driving interlock. That is, an electric vehicle plugged into a terminal but not charging cannot be started, thus maintaining the safety of other terminals and the electric vehicle, and preventing charging safety accidents. Attached Figure Description

[0032] Figure 1 A schematic diagram of a DC power control and guidance circuit structure for charging an electric vehicle is provided in an embodiment of this application. Figure 2 This is a schematic diagram of another DC power control guide circuit structure provided in an embodiment of this application; Figure 3 A schematic diagram of a multi-terminal charging guidance multiplexing circuit structure provided in an embodiment of this application; Figure 4 This is a schematic diagram of another multi-terminal charging guidance multiplexing circuit structure provided in an embodiment of this application; Figure 5 This is a schematic diagram of another multi-terminal charging guidance multiplexing circuit structure provided in an embodiment of this application; Figure 6 A schematic diagram of the electrical control principle structure of a charging pile provided in an embodiment of this application; Figure 7 This is a schematic diagram of a charging system provided in an embodiment of this application.

[0033] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0036] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. 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 impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0037] First, the DC charging control and guidance circuit and the driving interlock of the electric vehicle will be explained.

[0038] Please refer to Figure 1 This is a schematic diagram of an electric vehicle charging circuit structure provided in an embodiment of this application. Figure 1 As shown, it includes the off-board charger, the vehicle interface, and the electric vehicle.

[0039] The three-phase circuit of the off-board charger is divided into two parts. One part is connected to the AC / DC rectifier via switch K0 to form the control circuit. The other part is connected to the auxiliary power supply to form the charging power supply for the electric vehicle. The three-phase AC power is integrated into DC power by the AC / DC rectifier. The DC power is then transmitted to the DC / DC converter via transformer T, where it is converted into DC+ and DC- for the control and guidance circuit. The three-phase AC power, after passing through the auxiliary power supply, forms the charging DC power A+ and A- for the electric vehicle. The off-board motor controller obtains the CAN communication high line S+ and CAN communication low line S- via the Controller Area Network (CAN) bus. S+ and S- are used for control signal transmission. The off-board motor controller also generates a Connection Confirm (CC1) signal, which confirms the connection between the charging gun (hereinafter referred to as the terminal) and the electric vehicle via the CC1 interface.

[0040] It should be noted that, Figure 1 This is based on the DC power control guidance circuit structure defined in the national standard GB / T 18487.5-2024. The national standard stipulates that when the vehicle socket of an electric vehicle is plugged into the terminal, the electric vehicle is in a non-driving state. For example... Figure 1 As shown, when the vehicle socket of the electric vehicle is plugged into the vehicle plug (i.e., the terminal), the CC2 circuit is turned on, and the electric vehicle is in an inoperable mode.

[0041] Therefore, in practical applications, when the charging pile terminal is fully connected to the vehicle socket, CC2 is in a conductive state. The vehicle's detection device can detect the voltage value at monitoring point 2. If the voltage value indicates that the vehicle is correctly connected to the terminal, the vehicle is in an inoperable state.

[0042] Specifically, resistor R3 has a resistance of 1000 ohms, and resistor R5 has a resistance of 1000 ohms. Based on the series voltage divider principle, the voltage value at detection point 2 detected by the vehicle detection circuit (i.e., the voltage value in the CC2 circuit) is half the voltage value of U2.

[0043] In some implementations, charging stations can be equipped with multiple terminals; for example, a charging station with two terminals. Please refer to [link / reference]. Figure 2 This is a schematic diagram of a charging circuit structure for a charging pile including multiple terminals, provided in an embodiment of this application. Figure 2 As shown, when two terminals are included, a relay can be set at the output terminal of each guide signal. The relay includes normally closed contacts and normally open contacts, and the two contacts of the relay are connected to the two terminals respectively. Figure 2In this circuit, the common terminal of relay S60 is connected to the CAN-1 terminal, the normally closed contact of relay S60 is connected to the S-terminal of terminal 1, and the normally open contact of relay S60 is connected to the S-terminal of terminal 2. Therefore, relay S60 can control the S-path of both terminals. Similarly, relays S61, S62, S63, S64, and S65 have the same function and role in the circuit. Relay S62 controls the CC2 path state of terminals 1 and 2, and relay S63 controls the CC1 path state of terminals 1 and 2. The charger controller can control relays S60, S61, S62, S63, S64, and S65 to be synchronously normally closed or synchronously normally open.

[0044] pass Figure 2 The circuit structure shown indicates that when terminal 1 is in the working state, relays S60, S61, S62, S63, S64, and S65 are all in the normally closed state. When terminal 2 is in the working state, relays S60, S61, S62, S63, S64, and S65 are all in the normally open state.

[0045] It is worth noting that when terminal 1 is in the working state, the CC2 path in terminal 2 is in a non-conductive state. That is, if terminal 2 is plugged into electric vehicle 2 at this time, terminal 2 cannot provide power to electric vehicle 2, and since the CC2 path of terminal 2 is not conductive, electric vehicle 2 cannot perform driving interlock. Similarly, it can be determined that when terminal 2 is in the working state, the CC2 path in terminal 1 is in a non-conductive state, and therefore electric vehicle 1 cannot perform driving interlock. Therefore, there is a drawback in the control and guidance circuit, which may cause charging safety accidents.

[0046] Based on this, this application provides a multi-terminal charging guidance multiplexing circuit. This circuit can be applied to charging piles with multiple terminals. When multiple terminals are connected to electric vehicles, in scenarios where only one terminal is charging the electric vehicle, the electric vehicles connected to the other terminals can be in a driving interlock state. This protects the charging safety of electric vehicles and avoids damage to the charging pile and electric vehicles caused by driving interlock during charging.

[0047] The multi-terminal charging guidance multiplexing circuit includes: a grounding guidance module, a first electronic control switch, multiple second electronic control switches, multiple third electronic control switches, multiple first terminals connected to each of the second electronic control switches, and multiple second terminals connected to each of the third electronic control switches.

[0048] The driving interlock path of the first terminal is connected to the common terminal of the second electronic control switch. The first contact of the second electronic control switch is connected to the first contact of the first electronic control switch. The common terminal of the first electronic control switch is connected to the first terminal of the grounding guide module. The second contact of the second electronic control switch is connected to the second terminal of the grounding guide module. The first and second electronic control switches are used to control the driving interlock path in the first terminal to be in a conducting state.

[0049] The driving interlock path of the second terminal is connected to the common terminal of the third electronic control switch. The first contact of the third electronic control switch is connected to the second terminal of the grounding guide module. The second contact of the third electronic control switch is connected to the second contact of the first electronic control switch. The first and third electronic control switches are used to control the driving interlock path in the second terminal to be in the conducting state.

[0050] Among them, the first electronic control switch, each of the second electronic control switches, and each of the third electronic control switches are synchronous switches. Synchronous switches indicate that the first electronic control switch, each of the second electronic control switches, and each of the third electronic control switches are simultaneously in a normally closed state or a normally open state.

[0051] The following will use a multi-terminal charging guidance multiplexing circuit, which includes a second electronically controlled switch and a third electronically controlled switch, as an example to illustrate the specific structure and principle of the charging guidance multiplexing circuit.

[0052] It should be noted that in the embodiments of this application, the first electronic control switch is relay S62, the second electronic control switch is relay S66, and the third electronic control switch is relay S67. The first contact of each electronic control switch is the normally closed contact of relay S62, and the second contact of each electronic control switch is also a normally closed contact. In some interpretations, the common terminal of each electronic control switch can also be understood as the moving contact of the relay. The following will use relay S8 to represent the fourth electronic control switch, relay S63 to represent the fifth electronic control switch, relay S60 to represent the sixth electronic control switch, relay S61 to represent the seventh electronic control switch, relay S64 to represent the eighth electronic control switch, and relay S65 to represent the ninth electronic control switch as examples to illustrate the charging guidance multiplexing circuit in the embodiments of this application.

[0053] Please refer to Figure 3 This is a schematic diagram of a charging guidance multiplexing circuit structure provided in an embodiment of this application. Specifically, this embodiment uses an example of a charging guidance multiplexing circuit installed in a charging pile with two terminals, terminal 1 connected to electric vehicle 1 and terminal 2 connected to electric vehicle 2, to illustrate the working principle of the charging guidance multiplexing circuit.

[0054] The electronically controlled switch is an automated switch controlled by a circuit. It can be triggered upon receiving a small current, low voltage control signal. The electronically controlled switch includes normally closed contacts and normally open contacts, and is in either a normally closed or normally open state under the action of an electronic control signal. This application uses a relay as an example of the electronically controlled switch to illustrate the working principle of the multi-terminal charging guidance multiplexing circuit. This application does not limit the specific form of the electronically controlled switch.

[0055] like Figure 3 As shown, the charging guidance multiplexing circuit includes a grounding guidance module 01, relays S62, S66, and S67. The driving interlock path CC2 of terminal 1 is connected to the common terminal of relay S66. The normally closed contact of relay S66 is connected to the normally closed contact of relay S62. The normally closed common terminal of relay S62 is connected to the first terminal of grounding guidance module 01. The driving interlock path CC2 of terminal 2 is connected to the common terminal of relay S67. The normally closed contact of relay S67 is connected to the second terminal of grounding guidance module 01. The normally open contact of relay S67 is connected to the normally closed contact of relay S62.

[0056] Relays S62, S66, and S67 are synchronous switches, meaning they are simultaneously either normally closed or normally open. When terminal 1 is in operation, relays S62, S66, and S67 are all normally closed. The CC2 terminal of electric vehicle 1 is connected to the first terminal of grounding guide module 01 via the normally closed contacts of relays S66 and S62, forming a circuit and thus CC2 is in a conducting state. Simultaneously, the CC2 terminal of electric vehicle 2 is connected to the second terminal of grounding guide module 01 via the normally closed contact of relay S67, forming a circuit and thus CC2 is in a conducting state, and electric vehicle 2 is in a driving interlock state.

[0057] Similarly, it can be determined that when terminal 2 is in working state, relays S62, S66, and S67 are all in the normally open state. The CC2 terminal of electric vehicle 2 is connected to the first terminal of grounding guide module 01 through the normally open contacts of relays S67 and S62, and the CC2 path is in a conductive state. Simultaneously, the CC2 terminal of electric vehicle 1 is connected to the second terminal of grounding guide module 01 through the normally closed contact of relay S66, forming a CC2 loop in electric vehicle 1, thus CC2 is in a conductive state, and electric vehicle 1 is in a driving interlock state.

[0058] For example, please refer to Figure 4 This is a schematic diagram of a circuit structure for a charging guidance multiplexing circuit. For example... Figure 4As shown, the 12V DC voltage terminal is connected in series with the variable resistor R1, switch S1, and relay S63. The normally closed contact of relay S63 is connected to the CC1 path of terminal 1, and the normally open contact is connected to the CC1 path of terminal 2. The variable resistor R2' is connected in parallel across switch S1. The grounding guide module 01 consists of a first grounding terminal PE-1, a second grounding terminal PE-2, a variable resistor R3', a second resistor, and relay S6. The resistance of the second resistor can be 1kΩ. Figure 4 In the circuit shown, the second resistor is represented by its resistance value of 1kΩ.

[0059] It should be understood that the driving interlock path of each terminal is connected to the second grounding point PE-2 via a relay switch and a second resistor. This ensures that the driving interlock path of the terminal is always in a conductive state. The second resistor serves as a series voltage divider.

[0060] It should be noted that PE-1 and PE-2 are grounding terminals led out from the grounding wire of the DC power supply to the two ends of switch KM3. (See reference...) Figure 2 Determine the location of switch KM3 and identify PE-1 and PE-2.

[0061] In the multi-terminal charging guidance multiplexing circuit provided in this application embodiment, the use of multiple synchronous relays ensures that the driving interlock path remains active once each terminal is connected to an electric vehicle. Therefore, this charging guidance multiplexing circuit can be applied to other charging standards. For example, in some charging standards, the CC circuit is used to control the driving interlock path of the electric vehicle; in this case, setting the synchronous relay in the CC circuit achieves the technical objective achievable in this application embodiment. In other charging standards, the CPD circuit is the driving interlock path; in this case, setting the synchronous relay in the CPD circuit is sufficient. In still other charging standards, the PP circuit is the driving interlock path; in this case, setting the synchronous relay in the PP circuit is sufficient. Therefore, it can be determined that the charging guidance circuit in this application embodiment is compatible and can be applied to different charging standards.

[0062] If the charging station includes three or four terminals, a relay needs to be added adaptively in the charging guidance multiplexing circuit to ensure that the driving interlock path of terminal 3 or terminal 4 is always in the conducting state.

[0063] For example, if a charging pile includes three terminals, a relay S68 also needs to be set for terminal 3. The common terminal of relay S68 is connected to the CC2 path of terminal 3, the normally closed contact of relay S68 is connected to the normally closed contact of relay S62, and the normally open contact of relay S68 is connected to the second terminal of grounding guide module 01.

[0064] For example, if a charging pile includes four terminals, a relay S69 needs to be set for terminal 4. The common terminal of relay S69 is connected to the CC2 path of terminal 4, the normally closed contact of relay S69 is connected to the normally open contact of relay S62, and the normally open contact of relay S69 is connected to the second terminal of grounding guide module 01.

[0065] Additionally, it's worth noting that when the terminal is in operation, its CC1 guiding path is in a conductive state. Therefore, as the number of charging stations increases, it's necessary to adaptively add relays to the CC1 path to achieve synchronous control of the CC1 paths of multiple terminals. Figure 5 As shown, the normally closed contact of relay S63 is connected to the common terminal of relay S70, and the two contacts of relay S70 are connected to the CC1 path of terminal 1 and terminal 2 respectively. The normally open contact of relay S63 is connected to the common terminal of relay S71, and the two contacts of relay S71 are connected to the CC1 path of terminal 3 and terminal 4 respectively.

[0066] It is understood that the charging guidance multiplexing circuit provided in this application embodiment can be applied to charging piles with more than two terminals, and the number of relays can be adjusted adaptively according to the number of terminals.

[0067] It should be noted that when increasing the number of terminals, the number of electronically controlled switches in the S+, S-, A+, and A- paths also needs to be increased accordingly. For example, relay S60 can connect to multiple terminals as a switch in the S- path, relay S61 can connect to multiple terminals as a switch in the S+ path, relay S64 can connect to multiple terminals as a switch in the A- path, and relay S65 can connect to multiple terminals as a switch in the A+ path. In other words, increasing the number of terminals also requires an increase in the number of relays.

[0068] The common terminal of relay S60 is connected to the first guide signal terminal, i.e., the CAN-L terminal. The common terminal of relay S61 is connected to the second guide signal terminal, i.e., the CAN-H terminal. The common terminal of relay S64 is connected to the first DC signal terminal, i.e., the DC negative terminal. The common terminal of relay S65 is connected to the second DC signal terminal, i.e., the DC positive terminal.

[0069] In one possible implementation, based on a complete charging scenario, the charging pile includes two terminals, whose electrical principles are as follows: Figure 6 As shown. The control and guidance section outputs control signals and guidance signals, while the auxiliary power supply outputs DC A+ and A- DC power signals. The DC power source section outputs DC power to provide electrical energy for electric vehicle 1 and electric vehicle 2.

[0070] In this diagram, the normally closed contacts of relay S66 and relay S67 shown in Figure 6 are connected and connected to the resistor side of PE-2. Here, PE-2 and PE-2 in the pilot multiplexing circuit are grounded at the same point. The PE-2 grounding point is shown here for clarity.

[0071] This application also provides a multi-terminal charging detection device, which includes the aforementioned multi-terminal charging guidance multiplexing circuit, multiple first terminals, multiple second terminals, and a DC charging circuit.

[0072] Each first terminal is connected to the output terminal of the multi-terminal charging guidance multiplexing circuit and to the power output terminal of the DC charging circuit. Each second terminal is connected to the output terminal of the multi-terminal charging guidance multiplexing circuit and to the power output terminal of the DC charging circuit.

[0073] Each first terminal and each second terminal are used to provide power to the corresponding connected electric vehicles.

[0074] In a charging scenario where terminal 1 is connected to electric vehicle 1 and terminal 2 is connected to electric vehicle 2, when terminal 1 is in operation, the driving interlock circuit in terminal 2 is in a conducting state; when terminal 2 is in operation, the driving interlock circuit in terminal 1 is in a conducting state.

[0075] This application also provides a charging system, please refer to... Figure 7 .like Figure 7 As shown, the charging system includes at least two power modules 110, a controller 130, a power distribution device 140, and at least one charging interface 120. The power distribution device 140 includes the multi-terminal charging guidance multiplexing circuit mentioned in the above embodiments. The power distribution device 140 is connected to the controller 130, each power module 110, and each charging interface 120. The power module 110 converts AC power from the power grid into DC power to supply the charging interface. The controller 130 acquires the power demand of each charging interface 120 and generates a scheduling command based on the connection relationship of the controllable switches in the power distribution device 140 and the power demand. The power distribution device 140 controls the opening or closing of the controllable switches according to the scheduling command to distribute the output power of each power module to each charging interface.

[0076] In one optional implementation, the charging system provided in this application is an integrated DC charging pile, with the charging interface 120 used to connect the charging gun, and the charging gun being hung on the host of the charging system via the gun holder on the main body of the charging system.

[0077] In one optional implementation, the charging system provided in this application is a split-type DC charging pile. The charging system also includes multiple charging terminals. The charging interface 120 is used to connect the charging terminals. The charging terminals are set separately from the main body of the charging system. The charging terminals are equipped with a single charging gun or dual charging guns for outputting power to electric vehicles.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A multi-terminal charging guidance multiplexing circuit, characterized in that, include: The system includes a grounding guide module, a first electronically controlled switch, multiple second electronically controlled switches, multiple third electronically controlled switches, multiple first terminals connected to each of the second electronically controlled switches, and multiple second terminals connected to each of the third electronically controlled switches. The driving interlock path of the first terminal is connected to the common terminal of the second electronic control switch, the first contact of the second electronic control switch is connected to the first contact of the first electronic control switch, the common terminal of the first electronic control switch is connected to the first terminal of the grounding guide module, and the second contact of the second electronic control switch is connected to the second terminal of the grounding guide module. The first electronic control switch and the second electronic control switch are used to control the driving interlock path in the first terminal to be in a conducting state. The driving interlock path of the second terminal is connected to the common terminal of the third electronic control switch. The first contact of the third electronic control switch is connected to the second terminal of the grounding guide module. The second contact of the third electronic control switch is connected to the second contact of the first electronic control switch. The first electronic control switch and the third electronic control switch are used to control the driving interlock path in the second terminal to be in a conducting state. The first electronic control switch, each of the second electronic control switches, and each of the third electronic control switches are synchronous switches.

2. The charging guidance multiplexing circuit according to claim 1, characterized in that, When one terminal is charging, the remaining terminals are not charging, and the driving interlock path in each terminal is in the conducting state.

3. The charging guidance multiplexing circuit according to claim 1 or 2, characterized in that, The grounding guidance module includes: a first grounding point, a second grounding point, a first variable resistor, a second resistor, and a fourth electronically controlled switch; The first end of the first variable resistor is connected to the first grounding point, and the second end is connected to the first contact of the fourth electronically controlled switch. The common terminal of the fourth electronically controlled switch serves as the first terminal of the grounding guide module. The first end of the second resistor is connected to the second grounding point, and the second end is connected to the second contact of the fourth electronic control switch. The second end of the second resistor serves as the second end of the grounding guide module.

4. The charging guidance multiplexing circuit according to claim 1 or 2, characterized in that, The multi-terminal charging guidance multiplexing circuit also includes a third variable resistor, a fourth variable resistor, a first switch, and multiple fifth electronically controlled switches. One end of the third variable resistor is connected to the set voltage, and the other end is connected to one end of the first switch. The other end of the first switch is connected to the common terminal of each of the fifth electronic control switches. The fourth variable resistor is connected in parallel across the two ends of the first switch. The first contact of each of the fifth electronic control switches is connected to the connection confirmation terminal of each of the first terminals, and the second contact is connected to the connection confirmation terminal of each of the second terminals; The fifth electronically controlled switch is used to control the connection confirmation circuit of the first terminal or the connection confirmation circuit of the second terminal to be in a conducting state.

5. The charging guidance multiplexing circuit according to claim 1 or 2, characterized in that, The multi-terminal charging guidance multiplexing circuit also includes multiple sixth electronic control switches, multiple seventh electronic control switches, multiple eighth electronic control switches, and multiple ninth electronic control switches; The common terminal of each of the sixth electronically controlled switches is connected to the first guiding signal terminal, the first contact is connected to the first control signal terminal of each of the first terminals, and the second contact is connected to the first control signal terminal of each of the second terminals; The common terminal of each of the seventh electronically controlled switches is connected to the second guiding signal terminal, the first contact is connected to the second control signal terminal of each of the first terminals, and the second contact is connected to the second control signal terminal of each of the second terminals; The common terminal of each of the eighth electronically controlled switches is connected to the first terminal of the auxiliary power supply, the first contact is connected to the first DC signal terminal of each of the first terminals, and the second contact is connected to the first DC signal terminal of the second terminal; The common terminal of each of the ninth electronic control switches is connected to the second terminal of the auxiliary power supply, the first contact is connected to the second DC signal terminal of each of the first terminals, and the second contact is connected to the second DC signal terminal of the second terminal.

6. The charging guidance multiplexing circuit according to claim 3, characterized in that, The driving interlock path in each terminal is connected to the second grounding point through the second resistor, so that the driving interlock path in each terminal is in the conducting state. The second resistor is used for series voltage division.

7. A multi-terminal charging detection device, characterized in that, Includes the multi-terminal charging guidance multiplexing circuit as described in any one of claims 1-6; as well as, Multiple first terminals, multiple second terminals, and a DC charging circuit; Each of the first terminals is connected to the output terminal of the multi-terminal charging guidance multiplexing circuit and to the power output terminal of the DC charging circuit; Each of the second terminals is connected to the output terminal of the multi-terminal charging guidance multiplexing circuit and to the power output terminal of the DC charging circuit; Each of the first terminals and each of the second terminals are used to provide electrical energy to the corresponding connected electric vehicles.

8. A charging system, characterized in that, It includes at least two power modules, a controller, a power distribution device, and at least one charging interface; the power distribution device includes a multi-terminal charging guidance multiplexing circuit as described in any one of claims 1-6; The power distribution device is connected to the controller, each power module and each charging interface respectively. The power module is used to convert AC power from the power grid into DC power and supply it to the charging interface; The controller is used to obtain the required power of each charging interface and generate scheduling instructions based on the connection relationship of the controllable switches in the power distribution device and the required power. The power distribution device is used to control the opening or closing of the controllable switch according to the scheduling command, so as to distribute the output power of each power module to each charging interface.

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