Three-gun direct current charging system

Abstract

The utility model belongs to the technical field of electric automobiles, and discloses a three-gun direct current charging system, which is characterized in that an L1 line and an N line are connected with an input end of a power module A, an L2 line and the N line are connected with an input end of a power module B, an L3 line and the N line are connected with an input end of a power module C, one end of a switch KM1 is connected with an output port A +, the other end of the switch KM1 is connected with an output port B +, one end of a switch KM2 is connected with an output port A-, and the other end of the switch KM2 is connected with an output port B-. One end of the switch KM3 is connected with the output port B +, the other end of the switch KM3 is connected with the output port C +, one end of the switch KM4 is connected with the output port B-, the other end of the switch KM4 is connected with the output port C-, one end of the switch KM5 is connected with the output port A-, the other end of the switch KM5 is connected with the output port C-, and one end of the switch KM6 is connected with the output port A +, and the other end of the switch KM6 is connected with the output port C +. The beneficial effects of the utility model are that the automobile charging efficiency is improved, the charging time is shortened, and the residual capacity of the power transformer can be utilized to the maximum.

Description

Technical Field

[0001] The utility model relates to the technical field of electric vehicles, in particular to a three-gun direct current charging system. Background Art

[0002] As the popularity of electric vehicles increases, the demand for electric vehicle charging services is strong. Providing convenient charging services to car owners is an important issue that needs to be solved for the development of the electric vehicle industry. After building charging stations in places such as residential parking lots, shopping mall parking lots, hotel parking lots, and industrial park parking lots, electric vehicle owners do not need to go to charging stations to charge, which can greatly shorten the charging time cost of car owners. However, building charging stations in these places may face the problem of insufficient remaining capacity of power transformers, resulting in low charging efficiency, or the power transformers need to be upgraded and expanded.

[0003] Therefore, it is necessary to provide a three-gun DC charging system that fully utilizes the remaining capacity of the voltage transformer to meet the needs of charging multiple vehicles, while increasing the charging power when charging a single vehicle and shortening the charging time. Utility Model Content

[0004] The utility model discloses a three-gun direct current charging system, which relates to the field of direct current charging systems for electric vehicles and can effectively solve the technical problems involved in the background technology.

[0005] To achieve the above purpose, the technical solution of the utility model is:

[0006] A three-gun DC charging system includes an AC power distribution module, which includes a PE line, an L1 line, an L2 line, an L3 line and an N line. The L1 line and the N line are connected to the input end of the power module A, the L2 line and the N line are connected to the input end of the power module B, and the L3 line and the N line are connected to the input end of the power module C.

[0007] The output end of the power module A includes an output port A+ and an output port A-, the output port A+ is connected to one end of the switch K1_A, the other end of the switch K1_A is connected to the charging gun A, the output port A- is connected to one end of the switch K2_A, and the other end of the switch K2_A is connected to the charging gun A; the output end of the power module B includes an output port B+ and an output port B-, the output port B+ is connected to one end of the switch K1_B, the other end of the switch K1_B is connected to the charging gun B, the output port B- is connected to one end of the switch K2_B, and the other end of the switch K2_B is connected to the charging gun B; the output end of the power module C includes an output port C+ and an output port C-, the output port C+ is connected to one end of the switch K1_C, the other end of the switch K1_C is connected to the charging gun C, the output port C- is connected to one end of the switch K2_C, and the other end of the switch K2_C is connected to the charging gun C.

[0008] One end of the switch KM1 is connected to the output port A+, and the other end is connected to the output port B+, one end of the switch KM2 is connected to the output port A-, and the other end is connected to the output port B-, one end of the switch KM3 is connected to the output port B+, and the other end is connected to the output port C+, one end of the switch KM4 is connected to the output port B-, and the other end is connected to the output port C-, one end of the switch KM5 is connected to the output port A-, and the other end is connected to the output port C-, and one end of the switch KM6 is connected to the output port A+, and the other end is connected to the output port C+.

[0009] By selectively opening and closing switches KM1-KM6, changing the circuit flow direction and adjusting the output power, a 21kW three-gun DC charging system is designed without upgrading or expanding the power transformer. When a single vehicle is charging, a charging power of 21kw can be achieved, and when three vehicles are charging at the same time, each vehicle has a charging power of 7kw. This makes full use of the remaining capacity of the voltage transformer to meet the charging needs of multiple vehicles, while increasing the charging power when charging a single vehicle and shortening the charging time.

[0010] As a preferred improvement of the present utility model: a switch 1 is provided on the L1 line, the L2 line, the L3 line and the N line.

[0011] As a preferred improvement of the present invention: the switch 1 is a circuit breaker.

[0012] As a preferred improvement of the present invention: a switch 2 is provided on the L1 line, the L2 line and the L3 line, and the switch 2 is located on a side of the switch 1 close to the power module A.

[0013] As a preferred improvement of the present invention: the switch 2 is an AC contactor.

[0014] As a preferred improvement of the present utility model: the charging system further comprises a controller unit, the controller unit is connected to an external auxiliary power circuit, and the external auxiliary power circuit is connected to the L3 line and the N line.

[0015] As a preferred improvement of the present utility model: the switch K1_A, the switch K2_A, the switch K1_B, the switch K2_B, the switch K1_C and the switch K2_C are normally open DC contactors.

[0016] As a preferred improvement of the present utility model: the switch KM1, the switch KM2, the switch KM3, the switch KM4, the switch KM5 and the switch KM6 are normally open DC contactors.

[0017] As a preferred improvement of the present invention: the power module A, the power module B and the power module C have the same structure.

[0018] As a preferred improvement of the utility model: the power module A, the power module B and the power module C share the N line, and all have a 220V input

[0019] The beneficial effects of the utility model are as follows:

[0020] The three-gun DC charging system can meet the low-power (7kw) charging needs of three vehicles at the same time, and reach the maximum charging power (21kw) when charging a single vehicle, thereby improving the charging efficiency of the vehicle and shortening the charging time. In places where the remaining capacity of the power transformer is insufficient, there is no need to expand the power transformer, and the remaining capacity of the power transformer can be maximized to meet the charging needs of car owners. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0022] Figure 1 It is a schematic diagram of a three-gun DC charging system of the utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the power module of the utility model. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in combination with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0026] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0029] See also Figure 1As shown, the utility model provides a three-gun DC charging system, including an AC power distribution module (mains power input), the AC power distribution module includes a PE line, an L1 line, an L2 line, an L3 line and an N line, the L1 line and the N line are connected to the input end of the power module A, the L2 line and the N line are connected to the input end of the power module B, and the L3 line and the N line are connected to the input end of the power module C; the output end of the power module A includes an output port A+ and an output port A-, the output port A+ is connected to one end of the switch K1_A, and the other end of the switch K1_A is connected to the charging gun A gun, the output port A- is connected to one end of the switch K2_A, and the other end of the switch K2_A is connected to the charging gun A gun, the output port A- is connected to one end of the switch K2_A, and the other end of the switch K2_A is connected to the charging gun A gun, and the output port A- is connected to one end of the switch K2_A. The output end of the power module B includes an output port B+ and an output port B-, the output port B+ is connected to one end of the switch K1_B, the other end of the switch K1_B is connected to the charging gun B, the output port B- is connected to one end of the switch K2_B, and the other end of the switch K2_B is connected to the charging gun B; the output end of the power module C includes an output port C+ and an output port C-, the output port C+ is connected to one end of the switch K1_C, the other end of the switch K1_C is connected to the charging gun C, the output port C- is connected to one end of the switch K2_C, and the other end of the switch K2_C is connected to the charging gun C. Specifically, the AC power input is divided into three routes through the AC distribution module and connected to three power modules respectively. The power modules process and transform the AC power into DC power that can charge electric vehicles. The three power modules are connected to three charging guns respectively, which is equivalent to a charging pile with three charging guns, which can charge three electric vehicles respectively. The conduction of the switch control circuits such as switch 1, switch 2, K1_A, K2_A, etc. is used to control the charging process. The controller unit connects various switches and power modules and other structures to control the operation of the entire system.

[0030] One end of switch KM1 is connected to the output port A+, and the other end is connected to the output port B+, one end of switch KM2 is connected to the output port A-, and the other end is connected to the output port B-, one end of switch KM3 is connected to the output port B+, and the other end is connected to the output port C+, one end of switch KM4 is connected to the output port B-, and the other end is connected to the output port C-, one end of switch KM5 is connected to the output port A-, and the other end is connected to the output port C-, and one end of switch KM6 is connected to the output port A+, and the other end is connected to the output port C+. Through 6 switches, the direction of the output current of the three power modules is adjusted, which can realize high-power charging of a single vehicle, low-power charging of three vehicles, and high-power charging of one vehicle and low-power charging of two vehicles, meet the needs of charging multiple vehicles, improve the charging efficiency of vehicles, shorten the charging time, and make full use of the remaining capacity of the power transformer.

[0031] As an implementation method, the utility model is a 21kW three-gun DC charging system, which consists of a power cabinet, 3 terminals and a charging cable. The power cabinet includes a circuit breaker, an AC contactor, a switching power supply, a power module, a controller, a contactor, an AC input cable, a fan (cooling), an LED light board (display status), a travel switch (control cabinet door switch), etc. The terminal includes a charging indicator light, an emergency stop button, a gun socket and a DC charging gun, etc. In places such as community parking lots, shopping mall parking lots, hotel parking lots, and industrial park parking lots where the residual power of the power transformer is insufficient, without the transformation of the voltage transformer expansion, it can meet the charging needs of multiple vehicles, improve the charging efficiency of the car, shorten the charging time, and make full use of the remaining capacity of the power transformer.

[0032] In this embodiment, the L1 line, the L2 line, the L3 line and the N line are provided with a switch 1, and the switch 1 is a circuit breaker. The L1 line, the L2 line and the L3 line are provided with a switch 2, and the switch 2 is located on the side of the switch 1 close to the power module A, and the switch 2 is an AC contactor. The charging system also includes a controller unit, and the controller unit is connected to an external auxiliary source circuit (for power supply), and the external auxiliary source circuit connects the L3 line and the N line. The switch K1_A, the switch K2_A, the switch K1_B, the switch K2_B, the switch K1_C and the switch K2_C are normally open DC contactors with a more stable structure, and the switch KM1, the switch KM2, the switch KM3, the switch KM4, the switch KM5 and the switch KM6 are contactors.

[0033] The input is a 5-wire 3-phase system. The L1, L2, L3, and N lines are connected to the input circuit breaker (switch 1), and the PE line is locked in the casing. The circuit breaker output is connected to the AC contactor (switch 2) T1, T2, T3 and the external auxiliary power module with an input power of 220V. The control signals of the AC contactors A1 and A2 are connected to the controller unit, and the external auxiliary power module provides DC power for the controller unit. The AC contactor output L1 and N lines are connected to the input of the A power module, the L2 and N lines are connected to the input of the B power module, and the L3 and N lines are connected to the input of the C power module. The three power modules share the N line. The power module output is connected to the power distribution contactor KM1, KM2, KM3, KM4, KM5, KM6 and the corresponding metering sampling board. The power distribution contactor control signal is connected to the controller unit. The three 7kw power modules communicate with the controller through CAN communication.

[0034] The output of power module A is connected to contactors K1_A and K2_A through the metering sampling board, and the contactor controller signal is connected to power module A. The output of power module B is connected to contactors K1_B and K2_B through the metering sampling board, and the contactor controller signal is connected to power module B. The output of power module C is connected to contactors K1_C and K2_C through the metering sampling board, and the contactor controller signal is connected to power module C. The signal of DC charging gun A is connected to power module A, the signal of DC charging gun B is connected to power B, and the signal of DC charging gun C is connected to power C. The charging control guidance of each gun and the communication with the vehicle BMS are the responsibility of the corresponding power module (existing technology). The emergency stop signal of the terminal and the internal fan of the system, the access control travel switch signal are connected to the controller unit. The controller unit is responsible for power distribution, background interaction, charging billing and other functions. It has been improved on the basis of the existing charging pile. A single charging pile has three output charging guns. Through the setting of switch KM1-6, the charging pile can charge three cars at a single power at the same time, or charge a single car at triple power, thereby improving the charging efficiency of the car, shortening the charging time, and maximizing the use of the remaining capacity of the power transformer to meet the charging needs of car owners.

[0035] In this embodiment, the power module A, the power module B and the power module C have the same structure. The circuit structure of the power module is as follows: Figure 2As shown. The live wire L is connected to the fuse F1, the fuse F1 is connected to the switch S1 and the resistor R1, the switch S1, the resistor R1 and the neutral wire N are connected to the rectifier circuit (a common circuit), the output of the rectifier circuit is connected to the PFC circuit, the PFC circuit includes a capacitor C1, one end of the capacitor C1 is connected to one end of the inductor L1, the other end of the inductor L1 is connected to the drain of the MOS tube Q1 and the positive end of the diode D1, the negative end of the diode D1 is connected to one end of the capacitor C2, the drain of the MOS tube Q2 and the drain of the MOS tube Q3, the other end of the capacitor C1, the source of the MOS tube Q1, the other end of the capacitor C2, the source of the MOS tube Q4 and the source of the MOS tube Q5 are connected, and the MOS tube Q The source of MOS tube Q2 is connected to the drain of MOS tube Q4 and pin 4 of transformer T1, the source of MOS tube Q3 is connected to the drain of MOS tube Q5 and one end of capacitor C3, the other end of capacitor C3 is connected to one end of inductor L2, the other end of inductor L2 is connected to pin 1 of transformer T1, pin 2 of transformer T1 is connected to pin 3 of transformer TI1, pin 5 of transformer T1 is connected to pin 7 of transformer T1, the positive end of diode D2 and the negative end of diode D4, pin 6 of transformer T1 is connected to pin 8 of transformer T1, the positive end of diode D3 and the negative end of diode D5, the negative end of diode D2 is connected to the negative end of diode D3, one end of capacitor C4, and the negative end of diode D5. The negative end of the diode D10 is connected to one end of the fuse F2, the other end of the fuse F2 is connected to the charging gun through the switch K1, the positive end of the diode D4 is connected to the positive end of the diode D5, the other end of the capacitor C4, the negative end of the diode D11 and the negative end of the diode D12, the positive end of the diode D10 is connected to the positive end of the diode D11 through the switch S2, the pin 9 of the transformer T1 is connected to the pin 11 of the transformer T1, the positive end of the diode D6 and the negative end of the diode D8, the pin 10 of the transformer T1 is connected to the pin 12 of the transformer T1, the positive end of the diode D7 and the negative end of the diode D9, the negative end of the diode D6 is connected to the negative end of the diode D7, one end of the capacitor C5 And the positive end of the diode D10, the positive end of the diode D8 is connected to the positive end of the diode D9, the other end of the capacitor C5 and the positive end of the diode D12, the positive end of the diode D12 is connected to the switch K2 through a shunt (optional), a discharge circuit can be connected between the negative end of the diode D10 and the positive end of the diode D12, pins 1 / 2 of the transformer T1 are a coil, pins 3 / 4 are a coil, pins 5 / 6 are a coil, pins 7 / 8 are a coil, pins 9 / 10 are a coil, and pins 11 / 12 are a coil. The circuit is also provided with a controller to control the operation of the circuit, and the power conversion module circuit structure of the existing charging pile can also be adopted.

[0036] The following are the switching states of the power distribution contactors corresponding to the 10 power distribution modes (taking 7KW for a single vehicle as an example).

[0037] 1. When only gun A is charged, close the power distribution contactors KM1, KM2, KM5, and KM6 to achieve 21kW power charging of gun A (K1_A and K2_A are closed accordingly).

[0038] 2. When only gun B is charging, close the power distribution contactors KM1, KM2, KM3, and KM4 to achieve 21kW power charging of gun B.

[0039] 3. When only the C gun is charging, close the power distribution contactors KM3, KM4, KM5, and KM6 to achieve 21kW power charging of the C gun.

[0040] 4. When only gun A is charged at 21kW, after gun B is connected, disconnect the power distribution contactors KM1 and KM2. At this time, gun A is charged at 14kW and gun B is charged at 7kW.

[0041] 5. When only gun A is charging at 21kW, after gun C is connected, disconnect the power distribution contactors KM5 and KM6. At this time, gun A is charging at 14kW and gun C is charging at 7kW.

[0042] 6. When only Gun B is charging at 21kW, after Gun A is connected, disconnect the power distribution contactors KM1 and KM2. At this time, Gun B is charging at 14kW and Gun A is charging at 7kW.

[0043] 7. When only gun B is charging at 21kW, after gun C is connected, disconnect the power distribution contactors KM3 and KM4. At this time, gun B is charging at 14kW and gun C is charging at 7kW.

[0044] 8. When only C gun is charging at 21kW, after connecting A gun, disconnect the power distribution contactors KM5 and KM5. At this time, C gun is charging at 14kW and A gun is charging at 7kw.

[0045] 9. When only C gun is charging at 21kW, after connecting to B gun, disconnect the power distribution contactors KM3 and KM4. At this time, C gun is charging at 14kW and B gun is charging at 7kW.

[0046] 10. When the three guns are charged at the same time, disconnect all power distribution contactors to achieve 7kW charging power for each of the three guns A, B, and C.

[0047] Although the implementation scheme of the utility model has been disclosed as above, it is not limited to the applications listed in the specification and the implementation scheme. It can be fully applied to various fields suitable for the utility model. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A three-gun DC charging system, characterized by: An AC power distribution module is included, wherein the AC power distribution module includes a PE line, an L1 line, an L2 line, an L3 line and an N line, wherein the L1 line and the N line are connected to the input end of the power module A, the L2 line and the N line are connected to the input end of the power module B, and the L3 line and the N line are connected to the input end of the power module C; The output end of the power module A includes an output port A+ and an output port A-, the output port A+ is connected to one end of the switch K1_A, the other end of the switch K1_A is connected to the charging gun A, the output port A- is connected to one end of the switch K2_A, the other end of the switch K2_A is connected to the charging gun A; The output end of the power module B includes an output port B+ and an output port B-, the output port B+ is connected to one end of the switch K1_B, the other end of the switch K1_B is connected to the charging gun B, the output port B- is connected to one end of the switch K2_B, the other end of the switch K2_B is connected to the charging gun B; The output end of the power module C includes an output port C+ and an output port C-, the output port C+ is connected to one end of the switch K1_C, the other end of the switch K1_C is connected to the charging gun C, the output port C- is connected to one end of the switch K2_C, the other end of the switch K2_C is connected to the charging gun C; One end of the switch KM1 is connected to the output port A+, and the other end is connected to the output port B+, one end of the switch KM2 is connected to the output port A-, and the other end is connected to the output port B-, one end of the switch KM3 is connected to the output port B+, and the other end is connected to the output port C+, one end of the switch KM4 is connected to the output port B-, and the other end is connected to the output port C-, one end of the switch KM5 is connected to the output port A-, and the other end is connected to the output port C-, and one end of the switch KM6 is connected to the output port A+, and the other end is connected to the output port C+.

2. A three-gun DC charging system according to claim 1, characterized in that: A switch 1 is provided on the L1 line, the L2 line, the L3 line, and the N line.

3. A three-gun DC charging system according to claim 2, characterized in that: The switch 1 is a circuit breaker.

4. A three-gun DC charging system according to claim 2, characterized in that: A switch 2 is provided on the L1 line, the L2 line and the L3 line. The switch 2 is located on a side of the switch 1 close to the power module A.

5. A three-gun DC charging system according to claim 4, characterized in that: The switch 2 is an AC contactor.

6. A three-gun DC charging system according to claim 1, characterized in that: The charging system further includes a controller unit connected to an external auxiliary power circuit, and the external auxiliary power circuit is connected to the L3 line and the N line.

7. A three-gun DC charging system according to claim 1, characterized in that: The switch K1_A, the switch K2_A, the switch K1_B, the switch K2_B, the switch K1_C and the switch K2_C are normally open DC contactors.

8. A three-gun DC charging system according to claim 1, characterized in that: The switch KM1 , the switch KM2 , the switch KM3 , the switch KM4 , the switch KM5 , and the switch KM6 are normally open DC contactors.

9. A three-gun DC charging system according to claim 1, characterized in that: The power module A, the power module B and the power module C have the same structure.

10. A three-gun DC charging system according to claim 1, characterized in that: The power module A, the power module B and the power module C share the N line and all have a 220V input.

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