Direct-current distributed charging pile power flexible distribution system

Abstract

The utility model relates to the technical field of electric automobile charging, in particular to a direct-current distributed charging pile power flexible distribution system. Comprising an alternating current input unit, a main control unit, an alternating current input control unit, a charging module unit and a power distribution unit, the alternating current input unit is connected with the charging module unit through the alternating current input control unit, the charging module unit comprises a plurality of charging modules, and the power distribution unit comprises a plurality of PDUs. The input end of each charging module is connected with the output end of the alternating current input control unit, the input end of each PDU is connected with the output ends of the multiple charging modules, and the output end of each PDU is connected to the split charging pile; the input end of the main control unit receives state information of the charging module unit, the power distribution unit and the split charging piles, and the output end of the main control unit outputs control signals of the power distribution unit. According to the utility model, integration and modularization of flexible power distribution are realized by adopting the PDU, and the cost and the failure rate are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electric vehicle charging, in particular to a system that adopts a PDU to realize flexible power distribution of a DC distributed charging pile. Background Art

[0002] Most of the existing technologies use an ordinary relay matrix arrangement to achieve flexible distribution of DC distributed charging pile power, and power distribution is achieved by vertically and horizontally overlapping ordinary relays KM and copper busbar TP matrices. However, this method generally has problems such as complex structure, numerous auxiliary wiring harnesses and difficult wiring, high cost and failure rate, and large footprint. In addition, a large number of ordinary relays and copper busbars are used for overlapping, and the auxiliary wiring harnesses are numerous and difficult to route, which is prone to insulation accidents. It does not meet the "reliability and stability" requirements of electrical equipment and is difficult to effectively ensure the long-term safe operation of charging piles. Utility Model Content

[0003] In view of the defects of the prior art, the utility model provides a DC distributed charging pile power flexible distribution system. By adopting a high-voltage relay integrated distribution unit PDU, the integration and modularization of power flexible distribution is achieved, the internal structure of the DC distributed charging pile is greatly simplified, and the cost and high failure rate caused by the complex structure are effectively reduced.

[0004] In order to solve the technical problem, the technical solution adopted by the utility model is: a DC distributed charging pile power flexible distribution system, including an AC input unit, a main control unit, an AC input control unit, a charging module unit and a power distribution unit, the AC input unit is connected to the charging module unit through the AC input control unit, the charging module unit includes multiple charging modules, the power distribution unit includes multiple PDUs, the input end of each charging module is connected to the output end of the AC input control unit, the input end of each PDU is respectively connected to the output end of the multiple charging modules, and the output end of each PDU is respectively connected to the split charging pile; the input end of the main control unit respectively receives the status information of the charging module unit, the power distribution unit, and each split charging pile, and the output end of the main control unit outputs the control signal of the power distribution unit.

[0005] Furthermore, the charging module is connected to the PDU via a cable and a transition copper bar. The number of charging modules and transition copper bars is N, where N is an integer greater than 1. i The output end is connected to the transition copper bar B through a cable i The input end of each PDU is connected to the transition copper bar B through a cable. i To B N The output end of each PDU is connected to different split charging piles. i represents the i-th charging module, B iRepresents the i-th transition copper busbar, 1≤i≤N.

[0006] Furthermore, the charging module is connected to the PDU via a cable and a switch terminal. The number of charging modules and switch terminals is N, where N is an integer greater than 1. i The output end is connected to the switch terminal B through a cable i The input end of each PDU is connected to switch terminal B through a cable. i To B N The output end of each PDU is connected to different split charging piles. i represents the i-th charging module, B i Represents the i-th switch terminal, 1≤i≤N.

[0007] Furthermore, the main control unit communicates serially with the charging module unit, the power distribution unit, and the split charging pile via a CAN line.

[0008] Furthermore, the AC input unit includes a wiring terminal, on which a three-phase line connection point, a neutral line connection point and a protective ground line connection point are provided. The three-phase line connection point, the neutral line connection point and the protective ground line connection point are connected to the input power supply. The AC input control unit includes a molded case circuit breaker QF1, an AC contactor KM1, a relay K1, a micro-breaker F1, a relay K2, a micro-breaker F2 and a fan CF. The normally open points of the molded case circuit breaker QF1 and the AC contactor KM1 are connected in series between the three-phase line connection point and the charging module unit. The coils of the relays K1 and K2 are respectively connected to the output end of the main control unit. The coil of the AC contactor KM1, the normally open point of the relay K1 and the micro-breaker F1 are connected in series between any three-phase line connection point and the neutral line connection point. The normally open points of the micro-breaker F2 and the relay K2 and the fan CF are connected in series between any three-phase line connection point and the neutral line connection point.

[0009] Furthermore, it also includes an auxiliary power supply unit, which includes a micro-breaker QF2, a socket XS1, a switching power supply UP1, a switching power supply UP2 and a switching power supply UP3. One end of the micro-breaker QF2 is connected to any three-phase line connection point and a neutral line connection point, and the other end of the micro-breaker QF2 is connected to the switching power supply UP1, the switching power supply UP2 and the switching power supply UP3 through the socket. The switching power supply UP1, the switching power supply UP2 and the switching power supply UP3 are respectively connected to the power supply end of the main control unit, the power supply end of the DPU and the power supply end of the temperature control board.

[0010] Furthermore, the auxiliary power supply unit also includes a split charging pile power supply branch, the split charging pile power supply branch includes a micro-breaker, one end of the micro-breaker is connected to any three-phase line connection point and neutral line connection point, and the other end of the micro-breaker is respectively connected to the phase line incoming terminal and the neutral line incoming terminal of the split charging pile.

[0011] Furthermore, it also includes a lightning protection unit, which includes a micro-breaker QF6 and an AC lightning arrester. One end of the micro-breaker QF6 is connected to the three-phase line connection point, the other end of the micro-breaker QF6 and the protective ground line connection point are respectively connected to one end of the AC lightning arrester, and the other end of the AC lightning arrester is connected to the neutral line connection point.

[0012] Furthermore, the input end of the main control unit is respectively connected to the temperature probe, humidity probe, smoke probe, access switch, and water immersion switch, and the main control unit receives status information of the molded case circuit breaker, AC lightning arrester, and AC contactor KM1.

[0013] The beneficial effects of the utility model are as follows: the highly integrated PDU is adopted to realize the integration and modularization of the flexible power distribution inside the DC distributed charging pile. The internal structure and electrical connection of the DC distributed charging pile are optimized to the greatest extent, effectively reducing the production cost and failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of using a relay matrix to achieve power distribution;

[0015] Figure 2 A schematic diagram of the AC input unit, lightning protection unit, and auxiliary power supply unit of a DC distributed charging pile power flexible distribution system using PDU;

[0016] Figure 3 A schematic diagram of an AC input control unit for realizing a DC distributed charging pile power flexible distribution system using a PDU;

[0017] Figure 4 A schematic diagram of a charging module unit and a power distribution unit for realizing a DC distributed charging pile power flexible distribution system using a PDU;

[0018] Figure 5 A schematic diagram of a main control unit for realizing a DC distributed charging pile power flexible distribution system using a PDU;

[0019] Figure 6 This is a schematic diagram of DC positive power distribution;

[0020] Figure 7 This is a schematic diagram of DC negative power distribution;

[0021] Figure 8 is a schematic diagram of a PDU;

[0022] In the figure: 101, AC input unit, 102, lightning protection unit, 103, auxiliary power supply unit, 104, main control unit, 105, AC input control unit, 106, charging module unit, 107, power distribution unit. DETAILED DESCRIPTION

[0023] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0024] Example 1

[0025] like Figure 1 As shown, it is a schematic diagram of the prior art using an ordinary relay matrix arrangement to achieve flexible power distribution of a DC distributed charging pile. This method uses a large number of ordinary relays and copper busbars, which generally have problems such as complex structure, high cost, and large footprint. There are many auxiliary wiring harnesses and the routing is difficult, which is prone to insulation accidents. It does not meet the "reliability and stability" requirements of electrical equipment and it is difficult to effectively ensure the long-term safe operation of the charging pile.

[0026] The system for realizing flexible power distribution of DC distributed charging piles by using PDU in this embodiment includes an AC input unit 101, a lightning protection unit 102, an auxiliary power supply unit 103, a main control unit 104, an AC input control unit 105, a charging module unit 106, and a power distribution unit 107. The system supplies power to a plurality of charging module units 106 through the AC input unit 101 and the AC input control unit 105. The module converts the AC 380V power supply into a DC 220V power supply and outputs it to the power distribution unit 107. The power supply is flexibly distributed to each split charging terminal through the PDU according to the charging demand of the electric vehicle.

[0027] like Figure 2 As shown, the AC input unit 101 includes a wiring terminal, and the wiring terminal is provided with a three-phase line connection point (A1, B1, C1), a neutral line connection point N1 and a protective ground line connection point PE, such as the three-phase line connection point (A1, B1, C1), the neutral line connection point N1 and the protective ground line connection point PE are connected to the input power supply. The auxiliary power supply unit 103 includes a micro-breaker QF2, a socket XS1, a switching power supply UP1, a switching power supply UP2 and a switching power supply UP3. One end of the micro-breaker QF2 is connected to any three-phase line connection point and a neutral line connection point, and the other end of the micro-breaker QF2 is connected to the switching power supply UP1, the switching power supply UP2 and the switching power supply UP3 through the socket respectively. The switching power supply UP1, the switching power supply UP2 and the switching power supply UP3 are respectively connected to the power supply end of the main control unit, the power supply end of the DPU and the power supply end of the temperature control board. The auxiliary power supply unit also includes a split charging pile power supply branch, which includes a micro-breaker, one end of which is connected to any three-phase line connection point and neutral line connection point, and the other end of which is respectively connected to the phase line incoming terminal and the neutral line incoming terminal of the split charging pile. The lightning protection unit includes a micro-breaker QF6 and an AC lightning arrester, one end of which is connected to the three-phase line connection point, the other end of which and the protective ground connection point are respectively connected to one end of the AC lightning arrester, and the other end of the AC lightning arrester is connected to the neutral line connection point.

[0028] Figure 3 As shown, the AC input control unit 105 includes a molded case circuit breaker QF1, an AC contactor KM1, a relay K1, a micro-breaker F1, a relay K2, a micro-breaker F2 and a fan CF. The normally open points of the molded case circuit breaker QF1 and the AC contactor KM1 are connected in series between the three-phase line connection points (A1, B1, C1) and the charging module unit 106. The coils of the relays K1 and K2 are respectively connected to the output ends of the main control unit 104. The coil of the AC contactor KM1, the normally open point of the relay K1 and the micro-breaker F1 are connected in series between any three-phase line connection point and the neutral line connection point N1. The micro-breaker F2, the normally open point of the relay K2 and the fan CF are connected in series between any three-phase line connection point and the neutral line connection point N1.

[0029] like Figure 4 As shown, the charging module unit 106 includes a plurality of charging modules. Figure 4 Among AU1 to AU9, the power distribution unit includes multiple PDUs, the input end of each charging module is connected to the output end of the AC input control unit 105, the input end of each PDU is respectively connected to the output ends of multiple charging modules, and the output end of each PDU is respectively connected to the split charging pile.

[0030] like Figure 5 As shown, the input end of the main control unit receives the status information of the charging module unit, the power distribution unit, and each split charging pile, and the output end of the main control unit outputs the control signal of the power distribution unit. Specifically, the main control unit communicates with the charging module unit, the power distribution unit, and the split charging pile in serial via the CAN line. The input end of the main control unit is also connected to the temperature probe, humidity probe, smoke probe, access control switch, and water immersion switch, and the main control unit receives the status information of the molded case circuit breaker, AC lightning arrester, and AC contactor KM1.

[0031] The system operation is mainly managed by the main control unit 104 and the power distribution unit 107. The main control unit 104 reads the information of the charging module unit 106 through CAN communication. In addition, all PDUs in the power distribution unit 107 also communicate with the main control unit 104 through CAN communication. After collecting the electric vehicle charging demand data, each split charging terminal uploads it to the main control unit 104. The main control unit sends instructions to the power distribution unit 107. After receiving the instructions, the PDU signal board controls the high-voltage relay of the PDU output board to close, and transmits power to the corresponding split charging terminal to complete the charging process.

[0032] The main control unit 104 can arbitrarily control the opening and closing of each PDU output board of the power distribution unit 107 according to the charging needs of each electric vehicle, and reasonably distribute the power of the DC distributed charging pile to each split charging terminal, truly realizing the flexible distribution of full power.

[0033] In this embodiment, the charging module is connected to the PDU through cables and transition copper bars TP. The number of charging modules and transition copper bars TP is 9. i The output end is connected to the transition copper bar B through a cable i The input end of each PDU is connected to the transition copper bus B through a cable. 1 To B 9 The output end of each PDU is connected to different split charging piles. i represents the i-th charging module, B i Represents the i-th transition copper busbar, 1≤i≤9.

[0034] like Figure 6 As shown in the figure, the positive output end of a charging module is connected to the input end of a transition copper busbar TP, and the input end of each PDU is connected to the transition copper busbar B through a cable. 1 To B 9 The output end of each PDU is connected to the positive pole of different split charging piles. Figure 7 As shown in the figure, the negative output end of a charging module is connected to the input end of a transition copper busbar, and the input end of each PDU is connected to the transition copper busbar B through a cable. 1 To B 9 At the output end, each PDU negative pole is connected to the negative pole of different split charging piles.

[0035] Figure 8 As shown, the PDU has 9 inputs and 4 outputs. The input end is connected to the transition copper bus, and the output end is connected to the split charging pile. At the same time, the PDU has a power port and a CAN communication interface for power supply and communication.

[0036] In this embodiment, the power distribution unit 107 adopts a highly integrated PDU, and adopts a high-voltage relay integrated distribution unit PDU to replace a large number of ordinary relay matrices, which greatly simplifies the internal structure layout, saves the overall product footprint, and effectively reduces the high cost caused by complex structure and the difficulty of routing of numerous auxiliary wiring harnesses, thereby realizing the integration and modularization of flexible power distribution.

[0037] The charging module unit 106 is connected to the power distribution unit 107 by cables, and the charging module is connected to the PDU by cables, and only a small section of transition copper busbar TP is retained, which saves a lot of matrix lap copper busbars, effectively reduces the high cost and insulation accidents caused by complex electrical connections, and ensures the long-term safe operation of the charging pile.

[0038] Example 2

[0039] In this embodiment, the charging module is connected to the PDU through cables and switch terminals. The number of charging modules and switch terminals is 9.i The output end is connected to the transition copper bar B through a cable i The input end of each PDU is connected to the transition copper bus B through a cable. 1 To B 9 The output end of each PDU is connected to different split charging piles. i represents the i-th charging module, B i Represents the i-th transition copper busbar, 1≤i≤9.

[0040] In this embodiment, the power distribution unit 107 adopts a highly integrated PDU, and adopts a high-voltage relay integrated distribution unit PDU to replace a large number of ordinary relay matrices, which greatly simplifies the internal structure layout, saves the overall product footprint, and effectively reduces the high cost caused by complex structure and the difficulty of routing of numerous auxiliary wiring harnesses, thereby realizing the integration and modularization of flexible power distribution.

[0041] The charging module unit 106 and the power distribution unit 107 are connected by cables, and the charging module and the PDU are connected by cables, retaining only a small section of the switch terminal, saving a large number of matrix overlapping copper bars, effectively reducing the high cost and easy insulation accidents caused by complex electrical connections, and ensuring the long-term safe operation of the charging pile.

[0042] The rest is the same as in Example 1 and will not be described again here.

[0043] The above description is only the basic principle and preferred embodiments of the present invention. Improvements and substitutions made by those skilled in the art based on the present invention belong to the protection scope of the present invention.

Claims

1. A DC distributed charging pile power flexible distribution system, characterized by: It includes an AC input unit, a main control unit, an AC input control unit, a charging module unit and a power distribution unit. The AC input unit is connected to the charging module unit through the AC input control unit. The charging module unit includes multiple charging modules. The power distribution unit includes multiple PDUs. The input end of each charging module is connected to the output end of the AC input control unit. The input end of each PDU is respectively connected to the output ends of multiple charging modules. The output end of each PDU is respectively connected to the split charging piles. The input end of the main control unit receives the status information of the charging module unit, the power distribution unit and each split charging pile respectively. The output end of the main control unit outputs the control signal of the power distribution unit.

2. The DC distributed charging pile power flexible distribution system according to claim 1 is characterized by: The charging module is connected to the PDU through cables and transition copper bars. The number of charging modules and transition copper bars is N, where N is an integer greater than 1. i The output end is connected to the transition copper bar B through a cable i The input end of each PDU is connected to the transition copper bus B1 to B through a cable. N The output end of each PDU is connected to different split charging piles. i represents the i-th charging module, B i Represents the i-th transition copper busbar, 1≤i≤N.

3. The DC distributed charging pile power flexible distribution system according to claim 1 is characterized by: The charging module is connected to the PDU through cables and switch terminals. The number of charging modules and switch terminals is N, where N is an integer greater than 1. i The output end is connected to the switch terminal B through a cable i The input end of each PDU is connected to switch terminals B1 to B through cables. N The output end of each PDU is connected to different split charging piles. i represents the i-th charging module, B i Represents the i-th switch terminal, 1≤i≤N.

4. The DC distributed charging pile power flexible distribution system according to claim 1 is characterized by: The main control unit communicates serially with the charging module unit, the power distribution unit, and the split charging pile via the CAN line.

5. The DC distributed charging pile power flexible distribution system according to claim 1 is characterized by: The AC input unit includes a wiring terminal, on which a three-phase line connection point, a neutral line connection point and a protective ground line connection point are provided. The three-phase line connection point, the neutral line connection point and the protective ground line connection point are connected to the input power supply. The AC input control unit includes a molded case circuit breaker QF1, an AC contactor KM1, a relay K1, a micro-breaker F1, a relay K2, a micro-breaker F2 and a fan CF. The normally open points of the molded case circuit breaker QF1 and the AC contactor KM1 are connected in series between the three-phase line connection point and the charging module unit. The coils of the relays K1 and K2 are respectively connected to the output end of the main control unit. The coil of the AC contactor KM1, the normally open point of the relay K1 and the micro-breaker F1 are connected in series between any three-phase line connection point and the neutral line connection point. The micro-breaker F2, the normally open point of the relay K2 and the fan CF are connected in series between any three-phase line connection point and the neutral line connection point.

6. The DC distributed charging pile power flexible distribution system according to claim 5 is characterized by: It also includes an auxiliary power supply unit, which includes a micro-breaker QF2, a socket XS1, a switching power supply UP1, a switching power supply UP2 and a switching power supply UP3. One end of the micro-breaker QF2 is connected to any three-phase line connection point and a neutral line connection point, and the other end of the micro-breaker QF2 is connected to the switching power supply UP1, the switching power supply UP2 and the switching power supply UP3 through the socket. The switching power supply UP1, the switching power supply UP2 and the switching power supply UP3 are respectively connected to the power supply end of the main control unit, the power supply end of the DPU and the power supply end of the temperature control board.

7. The DC distributed charging pile power flexible distribution system according to claim 6 is characterized by: The auxiliary power supply unit also includes a split charging pile power supply branch, which includes a micro-breaker. One end of the micro-breaker is connected to any three-phase line connection point and neutral line connection point, and the other end of the micro-breaker is respectively connected to the phase line incoming terminal and the neutral line incoming terminal of the split charging pile.

8. The DC distributed charging pile power flexible distribution system according to claim 5 is characterized by: It also includes a lightning protection unit, which includes a micro-breaker QF6 and an AC lightning arrester. One end of the micro-breaker QF6 is connected to the three-phase line connection point, the other end of the micro-breaker QF6 and the protective ground line connection point are respectively connected to one end of the AC lightning arrester, and the other end of the AC lightning arrester is connected to the neutral line connection point.

9. The DC distributed charging pile power flexible distribution system according to claim 8 is characterized by: The input end of the main control unit is respectively connected to the temperature probe, humidity probe, smoke probe, access switch, and water immersion switch, and the main control unit receives status information of the molded case circuit breaker, AC lightning arrester, and AC contactor KM1.

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