Electric vehicle three-phase intelligent charging pile load balancing circuit

Abstract

The utility model provides a three-phase intelligent charging pile load balancing circuit for an electric automobile. Comprising a relay SW1, a relay SW2, a relay SW3, a relay SW4, a relay SW5, a relay SW7, a first relay driving circuit, a second relay driving circuit, a third relay driving circuit, a fourth relay driving circuit, a fifth relay driving circuit and a seventh relay driving circuit. One end of a normally open contact of the relay SW1 is connected with the input end L3IN, and the other end of the normally open contact of the relay SW1 is connected with the output end L3OUT; one end of a coil of the relay SW1 is connected with positive voltage VCC, and the other end is connected with the first relay driving circuit; one end of a normally open contact of the relay SW2 is connected with the input end L3IN, and the other end of the normally open contact of the relay SW2 is connected with the output end L1OUT; one end of a coil of the relay SW2 is connected with positive voltage VCC, and the other end is connected with the second relay driving circuit; the load balance can be adjusted according to the power load.

Description

Technical Field

[0001] The utility model relates to a circuit in a charging pile, in particular to a load balancing circuit of a three-phase intelligent charging pile for an electric vehicle. Background Art

[0002] In recent years, the world has paid more and more attention to environmental protection and sustainable development. As an important green travel mode, electric vehicles have received widespread attention. However, charging technology is still an important factor restricting the development of electric vehicles. The existing technology has low charging efficiency and poor scalability, especially during the peak period of electricity consumption in summer or when the charging station load is relatively large during normal times, it is necessary to adjust the load and limit the power. Summary of the invention

[0003] In view of the deficiencies in the prior art, the embodiment of the utility model provides a load balancing circuit for a three-phase intelligent charging pile of an electric vehicle, which can adjust the load balance according to the power load. To achieve the above technical objectives, the technical solution adopted by the embodiment of the utility model is:

[0004] The utility model embodiment provides a three-phase intelligent charging pile load balancing circuit for electric vehicles, characterized in that it includes: relay SW1, relay SW2, relay SW3, relay SW4, relay SW5, relay SW7, a first relay drive circuit, a second relay drive circuit, a third relay drive circuit, a fourth relay drive circuit, a fifth relay drive circuit, and a seventh relay drive circuit;

[0005] One end of the normally open contact of the relay SW1 is connected to the input terminal L3_IN, and the other end is connected to the output terminal L3_OUT; one end of the coil of the relay SW1 is connected to the positive voltage VCC, and the other end is connected to the first relay driving circuit;

[0006] One end of the normally open contact of the relay SW2 is connected to the input terminal L3_IN, and the other end is connected to the output terminal L1_OUT; one end of the coil of the relay SW2 is connected to the positive voltage VCC, and the other end is connected to the second relay driving circuit;

[0007] One end of the normally open contact of the relay SW3 is connected to the input terminal L2_IN, and the other end is connected to the output terminal L2_OUT; one end of the coil of the relay SW3 is connected to the positive voltage VCC, and the other end is connected to the third relay driving circuit;

[0008] One end of the normally open contact of the relay SW4 is connected to the input terminal L2_IN, and the other end is connected to the output terminal L1_OUT; one end of the coil of the relay SW4 is connected to the positive voltage VCC, and the other end is connected to the fourth relay driving circuit;

[0009] One end of the normally open contact of the relay SW5 is connected to the input terminal L1_IN, and the other end is connected to the output terminal L1_OUT; one end of the coil of the relay SW5 is connected to the positive voltage VCC, and the other end is connected to the fifth relay driving circuit;

[0010] One end of the normally open contact of the relay SW7 is connected to the input terminal N_IN, and the other end is connected to the output terminal N_OUT; one end of the coil of the relay SW7 is connected to the positive voltage, and the other end is connected to the seventh relay driving circuit.

[0011] Furthermore, the electric vehicle three-phase intelligent charging pile load balancing circuit also includes a relay SW6 and a sixth relay drive circuit 6;

[0012] One end of the relay SW6 is connected to the input terminal L1_IN, and the other end is connected to the output terminal N_OUT; one end of the coil of the relay SW6 is connected to the positive voltage VCC, and the other end is connected to the sixth relay driving circuit 6.

[0013] Further, the output terminal L3_OUT, the output terminal L2_OUT, the output terminal L1_OUT and the output terminal N_OUT are installed in the charging gun.

[0014] Furthermore, freewheeling diodes are connected in parallel to the coils of the relay SW1 , the relay SW2 , the relay SW3 , the relay SW4 , the relay SW5 , and the relay SW7 .

[0015] Furthermore, a freewheeling diode is connected in parallel to the coil of the relay SW6.

[0016] The beneficial effects brought by the technical solution provided by the embodiment of the utility model are:

[0017] 1) It can balance the load according to the power consumption and adjust the load to limit the power.

[0018] 2) Able to meet the charging requirements of IT systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of a load balancing circuit in an embodiment of the present utility model. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0021] like Figure 1As shown, an electric vehicle three-phase intelligent charging pile load balancing circuit proposed in an embodiment of the utility model includes: relay SW1, relay SW2, relay SW3, relay SW4, relay SW5, relay SW7, a first relay drive circuit 1, a second relay drive circuit 2, a third relay drive circuit 3, a fourth relay drive circuit 4, a fifth relay drive circuit 5, and a seventh relay drive circuit 7;

[0022] One end of the normally open contact of the relay SW1 is connected to the input terminal L3_IN, and the other end is connected to the output terminal L3_OUT; one end of the coil of the relay SW1 is connected to the positive voltage VCC, and the other end is connected to the first relay drive circuit 1;

[0023] One end of the normally open contact of the relay SW2 is connected to the input terminal L3_IN, and the other end is connected to the output terminal L1_OUT; one end of the coil of the relay SW2 is connected to the positive voltage VCC, and the other end is connected to the second relay driving circuit 2;

[0024] One end of the normally open contact of the relay SW3 is connected to the input terminal L2_IN, and the other end is connected to the output terminal L2_OUT; one end of the coil of the relay SW3 is connected to the positive voltage VCC, and the other end is connected to the third relay drive circuit 3;

[0025] One end of the normally open contact of the relay SW4 is connected to the input terminal L2_IN, and the other end is connected to the output terminal L1_OUT; one end of the coil of the relay SW4 is connected to the positive voltage VCC, and the other end is connected to the fourth relay driving circuit 4;

[0026] One end of the normally open contact of the relay SW5 is connected to the input terminal L1_IN, and the other end is connected to the output terminal L1_OUT; one end of the coil of the relay SW5 is connected to the positive voltage VCC, and the other end is connected to the fifth relay driving circuit 5;

[0027] One end of the normally open contact of the relay SW7 is connected to the input terminal N_IN, and the other end is connected to the output terminal N_OUT; one end of the coil of the relay SW7 is connected to the positive voltage, and the other end is connected to the seventh relay driving circuit 7;

[0028] Generally speaking, when electric vehicles are charged using three-phase electricity, the charging speed is the fastest. At this time, the normally open contacts of relays SW1, SW3, SW5 and SW7 can be connected, and the normally open contacts of the remaining relays can be disconnected; at this time, the three-phase live wires are connected to the output terminals L3_OUT, L2_OUT and L1_OUT respectively after passing through relays SW1, SW3, SW5, and the neutral wire is connected to the output terminal N_OUT through relay SW7.

[0029] When the load of three-phase electricity is unbalanced, it can be switched to single-phase charging; if the first phase electricity is needed for charging, the normally open contacts of relays SW5 and SW7 are connected, the first phase live wire is connected to the output terminal L1_OUT through relay SW5, and the neutral line is connected to the output terminal N_OUT through relay SW7. If the second phase electricity is needed for charging, the normally open contacts of relays SW4 and SW7 are connected, the second phase live wire is connected to the output terminal L1_OUT through relay SW4, and the neutral line is connected to the output terminal N_OUT through relay SW7. If the third phase electricity is needed for charging, the normally open contacts of relays SW2 and SW7 are connected, the third phase live wire is connected to the output terminal L1_OUT through relay SW2, and the neutral line is connected to the output terminal N_OUT through relay SW7.

[0030] Furthermore, the three-phase intelligent charging pile load balancing circuit for electric vehicles proposed in the embodiment of the utility model further includes a relay SW6 and a sixth relay drive circuit 6;

[0031] One end of the relay SW6 is connected to the input terminal L1_IN, and the other end is connected to the output terminal N_OUT; one end of the coil of the relay SW6 is connected to the positive voltage VCC, and the other end is connected to the sixth relay driving circuit 6.

[0032] Through relay SW6, it can meet the IT systems of some countries. In the IT system, there is no neutral wire and charging is carried out through three live wires; the input terminal L3_IN is not used; the input terminal L2_IN, the input terminal L1_IN and the input terminal N_IN are connected to three live wires; if three-phase charging is required, the normally open contacts of relays SW3, SW5 and SW7 are connected, and the normally open contacts of the remaining relays are disconnected; if two live wires are required for charging, the normally open contacts of relays SW5 and SW7 can be connected, or the normally open contacts of relays SW4 and SW6 can be connected.

[0033] Furthermore, the output terminal L3_OUT, the output terminal L2_OUT, the output terminal L1_OUT and the output terminal N_OUT are installed in a charging gun; and the charging gun is connected to a charging socket on the electric vehicle.

[0034] More preferably, a freewheeling diode is connected in parallel to the coils of relay SW1, relay SW2, relay SW3, relay SW4, relay SW5 and relay SW7;

[0035] Preferably, a freewheeling diode is connected in parallel to the coil of relay SW6;

[0036] The freewheeling diode can release the electrical energy in the relay coil when the power is removed from the coil.

[0037] Each relay driving circuit can adopt a mature circuit in the existing technology, and is mainly driven by a MOS tube.

[0038] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A three-phase intelligent charging pile load balancing circuit for electric vehicles, characterized in that: include: Relay SW1, relay SW2, relay SW3, relay SW4, relay SW5, relay SW7, first relay drive circuit 1, second relay drive circuit 2, third relay drive circuit 3, fourth relay drive circuit 4, fifth relay drive circuit 5, seventh relay drive circuit 7; One end of the normally open contact of the relay SW1 is connected to the input terminal L3_IN, and the other end is connected to the output terminal L3_OUT; one end of the coil of the relay SW1 is connected to the positive voltage VCC, and the other end is connected to the first relay driving circuit; One end of the normally open contact of the relay SW2 is connected to the input terminal L3_IN, and the other end is connected to the output terminal L1_OUT; one end of the coil of the relay SW2 is connected to the positive voltage VCC, and the other end is connected to the second relay driving circuit; One end of the normally open contact of the relay SW3 is connected to the input terminal L2_IN, and the other end is connected to the output terminal L2_OUT; one end of the coil of the relay SW3 is connected to the positive voltage VCC, and the other end is connected to the third relay driving circuit; One end of the normally open contact of the relay SW4 is connected to the input terminal L2_IN, and the other end is connected to the output terminal L1_OUT; one end of the coil of the relay SW4 is connected to the positive voltage VCC, and the other end is connected to the fourth relay driving circuit; One end of the normally open contact of the relay SW5 is connected to the input terminal L1_IN, and the other end is connected to the output terminal L1_OUT; one end of the coil of the relay SW5 is connected to the positive voltage VCC, and the other end is connected to the fifth relay driving circuit; One end of the normally open contact of the relay SW7 is connected to the input terminal N_IN, and the other end is connected to the output terminal N_OUT; one end of the coil of the relay SW7 is connected to the positive voltage, and the other end is connected to the seventh relay driving circuit.

2. The three-phase intelligent charging pile load balancing circuit for electric vehicles as claimed in claim 1, characterized in that: Also includes a relay SW6 and a sixth relay drive circuit 6; One end of the relay SW6 is connected to the input terminal L1_IN, and the other end is connected to the output terminal N_OUT; one end of the coil of the relay SW6 is connected to the positive voltage VCC, and the other end is connected to the sixth relay driving circuit.

3. The three-phase intelligent charging pile load balancing circuit for electric vehicles as claimed in claim 1 or 2, characterized in that: The output terminal L3_OUT, the output terminal L2_OUT, the output terminal L1_OUT and the output terminal N_OUT are installed in the charging gun.

4. The three-phase intelligent charging pile load balancing circuit for electric vehicles as claimed in claim 1, characterized in that: Freewheeling diodes are connected in parallel to the coils of relay SW1 , relay SW2 , relay SW3 , relay SW4 , relay SW5 , and relay SW7 .

5. The three-phase intelligent charging pile load balancing circuit for electric vehicles as claimed in claim 2, characterized in that: A freewheeling diode is connected in parallel to the coil of relay SW6.

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