Relay control circuit for charging pile

Abstract

The utility model relates to the field of charging pile relay control, in particular to a relay control circuit for a charging pile. Comprising a first intermediate relay circuit, a second intermediate relay circuit and a third intermediate relay circuit, the first intermediate relay circuit is connected with the second intermediate relay circuit, and the second intermediate relay circuit is connected with the third intermediate relay circuit; according to the utility model, the interlocking circuit is designed on the premise of ensuring the charging logic, so that the normal operation of the relay control circuit is ensured, possible misoperation under special conditions is avoided, and the reliability of the circuit is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of charging pile relay control, specifically relates to a relay control circuit for charging pile. BACKGROUND

[0002] In the application scene of civilian charging pile, the application of direct current charging pile is very extensive. In order to make full use of charging power, the integrated direct current pile in the community is usually provided with double guns, and all the power is allocated to the vehicle when one vehicle is charging, and the charging power is allocated according to demand or in proportion when two vehicles are charging. There is a separate relay to control the output of each charging gun in the two charging guns, and there is a group of relays between the two charging guns to control the power scheduling between the two charging guns. Usually, each charging gun is provided with a group of charging modules to provide charging power. Each manufacturer tends to directly use a triode to enhance the relay drive signal sent by the controller, and then directly control the relay. This design is normal and has no problem, but power electronic equipment usually generates a large interference. When the interference is large or the power supply fluctuates, the relay may malfunction, causing equipment failure or damage.

[0003] Each manufacturer tends to directly use a triode to enhance the relay drive signal sent by the controller, and then directly control the relay. This design is normal and has no problem, but power electronic equipment usually generates a large interference. When the interference is large or the power supply fluctuates, the relay may malfunction, causing equipment failure or damage. SUMMARY

[0004] To solve the problems of the prior art, the utility model provides a relay control circuit for charging pile. The utility model relates to a charging pile, and can solve the reliability problem of relay control logic. While ensuring the normal action of the relay, the utility model relates to an interlocking circuit, which ensures the reliability of the control logic.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A relay control circuit for charging pile, comprising: intermediate relay circuit one, intermediate relay circuit two and intermediate relay circuit three, intermediate relay circuit one is connected with intermediate relay circuit two, intermediate relay circuit two and intermediate relay circuit three are connected;

[0007] Intermediate relay circuit one comprises:

[0008] The intermediate relay one K6, the foot 2 is grounded, the foot 1 of intermediate relay one K6 is connected with the one end of resistance R4, resistance R4 is current-limiting resistance, foot 1 and foot 2 are the coil connection foot of intermediate relay one K6, the other end of resistance R4 is connected with the controller, the one end of resistance R4 is connected with the anode of diode LED6, the cathode of diode LED6 is grounded, intermediate relay one K6 is connected with the cathode of diode D4, the anode of diode D4 is grounded, diode D4 is freewheeling diode, plays the role of freewheeling, as the freewheeling path when the coil of intermediate relay one K6 is disconnected, the drive signal DC1-EN generated by the controller acts on intermediate relay one K6 through resistance R4;

[0009] The foot 6 and foot 5 of intermediate relay one K6 are grounded, the foot 3 and foot 4 of intermediate relay one K6 are connected with intermediate relay circuit two, the foot 8 of intermediate relay one K6 is connected with resistance R8, the foot 8 of intermediate relay one K6 is connected with resistance R8, and the output end one is arranged between the foot 8 of intermediate relay one K6 and resistance R8, one end of resistance R8 is connected with power supply,

[0010] The foot 7 of intermediate relay one K6 is connected with resistance R9, the foot 7 of intermediate relay one K6 is connected with resistance R9, and the output end two is arranged between the foot 7 of intermediate relay one K6 and resistance R9, one end of resistance R9 is connected with power supply, preferably, diode LED5 is arranged between resistance R9 and foot 7, the anode of diode LED5 is connected with one end of R9, the cathode of diode LED5 is connected with output end two, output end two is connected with the anode of diode D6, and the cathode of diode D6 is connected with power supply.

[0011] Intermediate relay circuit two includes intermediate relay two K9, the foot 3 and foot 4 of intermediate relay two K9 are normally closed contacts, the foot 3 and foot 4 of intermediate relay one K6 are connected with the foot 3 and foot 4 of intermediate relay two K9, and intermediate relay circuit two outputs DC2-OUT- between the foot 8 of intermediate relay two K9 and resistance R12.

[0012] Intermediate relay circuit two outputs DC2-OUT+ between the foot 7 of intermediate relay two K9 and resistance R13.

[0013] Intermediate relay circuit three includes intermediate relay three K10, which has the same structure as intermediate relay two K9. Intermediate relay three K10 is connected to an OR gate circuit through resistor R26. The OR gate circuit is connected to chip U1 and the controller. The OR gate circuit includes diodes D1 and D2. The cathode of diode D1 is connected to one end of resistor R19, and the anode of diode D1 is connected to pin 4 of chip U1. Pin 3 of chip U1 is grounded, and pin 2 of chip U1 is connected to the controller. The controller transmits the DC2-EN signal to chip U1 through pin 2. Pin 1 of chip U1 is connected to the controller, and the controller transmits the DC1-EN signal to chip U1 through pin 1. Pin 5 of chip U1 is connected to the power supply. The other end of resistor R19 is connected to one end of resistor R20, and the other end of resistor R20 is connected to the cathode of diode D2. The anode of diode D2 is connected to the controller.

[0014] One end of resistor R26 is connected to pin 1 of intermediate relay 3K10, and pin 2 of intermediate relay 3K10 is connected to pins 3 and 4 of intermediate relay 2K9.

[0015] One end of resistor R26 is connected to the anode of diode LED30, and the other end of resistor R26 is connected to the cathode of diode D15. The anode of diode D15 is connected to the cathode of diode LED30. Both the cathode of diode D15 and the anode of diode LED30 are connected to pin 1 of intermediate relay K10. The anode of diode D15 and the cathode of diode LED30 are connected to pin 2 of intermediate relay K10 via a wire. Pins 5 and 6 of intermediate relay K10 are grounded. Pin 8 of intermediate relay K10 outputs DC-P-OUT- through resistor R29, and pin 7 of intermediate relay K10 outputs DC-P-OUT+ through resistor R30.

[0016] Compared with the prior art, the advantages of the utility model are: an interlocking circuit is designed under the premise of ensuring the charging logic, which ensures the normal operation of the relay control circuit, avoids possible malfunctions under special circumstances, and improves the reliability of the circuit. Attached Figure Description

[0017] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0018] Figure 1 This is the circuit schematic diagram of the present invention.

[0019] Figure 2 This is the circuit schematic of chip U1 of this invention. Detailed Implementation

[0020] The utility model will be further explained in detail by the following examples, the examples are only used to illustrate the utility model and do not limit the scope of the utility model.

[0021] A relay control circuit for charging pile, comprising: intermediate relay circuit one, intermediate relay circuit two and intermediate relay circuit three, intermediate relay circuit one is connected with intermediate relay circuit two, intermediate relay circuit two and intermediate relay circuit three are connected;Intermediate relay circuit one, intermediate relay circuit two and intermediate relay circuit three constitute intermediate relay circuit, intermediate relay circuit is connected with output relay, and the drive signal generated by controller controls intermediate relay circuit, and the output relay is controlled through intermediate relay circuit.

[0022] Intermediate relay circuit one comprises:

[0023] Intermediate relay one K6, the pin 2 is grounded, the pin 1 of intermediate relay one K6 is connected with one end of resistor R4, the resistor R4 is current-limiting resistor, the pin 1 and the pin 2 are the coil connection pins of intermediate relay one K6, the other end of resistor R4 is connected with controller, one end of resistor R4 is connected with the anode of diode LED6, the cathode of diode LED6 is grounded, intermediate relay one K6 is connected with the cathode of diode D4, and the anode of diode D4 is grounded;Diode D4 is freewheeling diode, plays the role of freewheeling, as the freewheeling path when the coil of intermediate relay one K6 is disconnected, and the drive signal DC1-EN generated by controller acts on intermediate relay one K6 through resistor R4;DC1-EN is the first charging gun output relay control signal generated by controller chip, and low level is effective;

[0024] The pin 6 and the pin 5 of intermediate relay one K6 are grounded, the pin 3 and the pin 4 of intermediate relay one K6 are connected with intermediate relay circuit two, the pin 3 and the pin 4 are normally closed contacts, the pin 8 of intermediate relay one K6 is connected with resistor R8, and an output end one is arranged between the pin 8 of intermediate relay one K6 and resistor R8, which outputs DC1-OUT-, and DC1-OUT- is the first charging gun output end negative bus relay control signal, and high level is effective, one end of resistor R8 is connected with power supply, and the power supply voltage is 12V;Preferably, diode LED4 is arranged between resistor R8 and pin 8, the anode of diode LED4 is connected with one end of R8, the cathode of diode LED4 is connected with the output end one, the output end one is connected with the anode of diode D5, and the cathode of diode D5 is connected with power supply;Diode D5 is freewheeling diode, plays the role of freewheeling, as the freewheeling path when the coil of output relay is disconnected,

[0025] The foot 7 of the intermediate relay K6 is connected with the resistor R9, the foot 7 and the foot 8 are normally open contacts, an output end two is arranged between the foot 7 of the intermediate relay K6 and the resistor R9, the output end two outputs DC1-OUT+, DC1-OUT+ is a first charging gun output end positive bus relay control signal, the high level is effective, one end of the resistor R9 is connected with a power supply, and the power supply voltage is 12V; preferably, a diode LED5 is arranged between the resistor R9 and the foot 7, the anode of the diode LED5 is connected with one end of the resistor R9, the cathode of the diode LED5 is connected with the output end two, the output end two is connected with the anode of a diode D6, the cathode of the diode D6 is connected with a power supply; the diode D6 is a freewheeling diode, plays a role of freewheeling, and serves as a freewheeling path when the output relay coil is disconnected;

[0026] The intermediate relay circuit two and the intermediate relay circuit one are consistent in structure, the intermediate relay circuit two comprises an intermediate relay K9, the foot 3 and the foot 4 of the intermediate relay K9 are normally closed contacts, the foot 3 and the foot 4 of the intermediate relay K6 are connected with the foot 3 and the foot 4 of the intermediate relay K9; the intermediate relay circuit two outputs DC2-OUT- between the foot 8 of the intermediate relay K9 and a resistor R12, DC2-OUT- is a second charging gun output end negative bus relay control signal, and the high level is effective; a driving signal DC2-EN generated by a controller acts on the intermediate relay K9 through the resistor R11;

[0027] The intermediate relay circuit two outputs DC2-OUT+ between the foot 7 of the intermediate relay K9 and a resistor R13; DC2-OUT+ is a second charging gun output end positive bus relay control signal, and the high level is effective;

[0028] The intermediate relay circuit three comprises an intermediate relay K10, the intermediate relay K10 and the intermediate relay K9 are consistent in structure, wherein the intermediate relay K10 is connected with an or gate circuit through a resistor R26, the or gate circuit is connected with a chip U1 and a controller, the or gate circuit comprises a diode D1 and a diode D2, the cathode of the diode D1 is connected with one end of a resistor R19, the anode of the diode D1 is connected with a pin 4 of the chip U1, a pin 3 of the chip U1 is grounded, a pin 2 of the chip U1 is connected with the controller, the controller transmits a DC2-EN signal to the chip U1 through the pin 2, a pin 1 of the chip U1 is connected with the controller, the controller transmits a DC1-EN signal to the chip U1 through the pin 1, a pin 5 of the chip U1 is connected with a power supply, and the power supply voltage is 12V; the other end of the resistor R19 is connected with one end of a resistor R20, the other end of the resistor R20 is connected with the cathode of the diode D2, the anode of the diode D2 is connected with the controller;

[0029] One end of the resistor R26 is connected with the pin 1 of the intermediate relay three K10, the pin 2 of the intermediate relay three K10 is connected with the pin 3 and the pin 4 of the intermediate relay two K9; DC2-EN is the second output relay control signal of the charging gun generated by the chip of the controller, and the low level is effective; PAREN-C is the control signal of the power scheduling relay generated by the chip of the controller, and the low level is effective; PAR-EN is the control signal of the power scheduling relay generated by the chip U1 logic operation, and the low level is effective; PAR-EN acts on the intermediate relay three K10 through the resistor R26.

[0030] One end of the resistor R26 is connected with the anode of the diode LED30, and one end of the resistor R26 is also connected with the cathode of the diode D15; the anode of the diode D15 is connected with the cathode of the diode LED30; the cathode of the diode D15 is connected with the anode of the diode LED30; the anode of the diode D15 and the cathode of the diode LED30 are connected with the pin 1 of the intermediate relay three K10; the anode of the diode D15 and the cathode of the diode LED30 are connected with the pin 2 of the intermediate relay three K10 through the wire; the pin 1 and the pin 2 are the coil connection pins; the pin 5 and the pin 6 of the intermediate relay three K10 are grounded; the pin 4 and the pin 3 of the intermediate relay three K10 are the normally closed points; the pin 7 and the pin 8 of the intermediate relay three K10 are the normally open points; the pin 8 of the intermediate relay three K10 outputs DC-P-OUT- between the resistor R29; DC-P-OUT- is the negative bus relay control signal of the power scheduling loop, and the high level is effective; the pin 7 of the intermediate relay three K10 outputs DC-P-OUT+ between the resistor R30; DC-P-OUT+ is the positive bus relay control signal of the power scheduling loop, and the high level is effective.

[0031] The relays are arranged on the positive bus and the negative bus of the charging gun 1 and the charging gun 2.

[0032] The driving signal generated by the controller controls the intermediate relay one K6, the intermediate relay two K9 and the intermediate relay three K10, and then controls the output relay. DC1-EN is the first output relay control signal of the charging gun generated by the controller, and the low level is effective. When the signal is high, the pin 5 and the pin 7 of the intermediate relay one K6 are connected, and the pin 6 and the pin 8 are connected; the pin 7 and the pin 8 of the intermediate relay one K6 are respectively the control signals of the positive bus relay and the negative bus relay of the first charging gun, and are grounded at this time, which are low levels and cannot drive the output relay, so that the output relay is disconnected; on the contrary, when the signal is low, the intermediate relay cannot be attracted, and the pin 7 and the pin 8 of the intermediate relay one K6 are high levels, so that the output relay is attracted.

[0033] Similarly, the working principle of the second charging gun relay control circuit is the same as that of the first charging gun. When a vehicle is charging, the output relay of the corresponding charging gun is attracted, and the charging power matched with the second charging gun is also allowed to be dispatched to the first charging gun; when two vehicles are simultaneously charging, the power dispatching relay is prohibited from being attracted, and if power dispatching is required, the charging power of one vehicle needs to be stopped, so that the power dispatching relay is prohibited from being attracted when two vehicles are simultaneously charging, and the power dispatching relay is allowed to be attracted when one vehicle is charging.

[0034] The control end of the intermediate relay three K10 is connected to a control signal at one end and to the feet 3 and 4 of the intermediate relay one K6 and the intermediate relay two K9 at the other end. When the intermediate relay one K6 and the intermediate relay two K9 are in action, the control end of the intermediate relay three K10 is connected to ground at one end and to a control signal at the other end, and can normally accept control.

[0035] When the intermediate relay one K6 and the intermediate relay two K9 are in action, the control end is connected to a control signal at one end and is suspended at the other end. The intermediate relay three K10 cannot receive the control signal and cannot be attracted, and at this time, the charging power cannot be dispatched. The control signal of the intermediate relay one K6 and the intermediate relay two K9 is directly generated by the controller, and the control signal of the intermediate relay three K10 is first subjected to an exclusive-NOR operation with the control signals of the intermediate relay one K6 and the intermediate relay two K9, i.e. Y=(A⊕B)!, and the chip U1 is an exclusive-NOR gate chip. When the states of the intermediate relay one K6 and the intermediate relay two K9 are the same, the chip U1 outputs a high level, and when the states are different, the chip U1 outputs a low level.

[0036] The output signal of the chip U1 and the control signal generated by the controller are subjected to an operation by an OR gate circuit composed of diodes. As long as one of the two signals is high, the control signal of the intermediate relay three K10 is high, the intermediate relay three K10 will act, and the power dispatching relay cannot be attracted and cannot dispatch power. Only when both input signals of the chip U1 are low, the output is low, and the power dispatching relay can be attracted, i.e. only when one vehicle is charging and power dispatching is required, the power dispatching relay is allowed to be attracted. In this way, the accuracy and reliability of the relay action are ensured from the aspects of signal control and relay connection.

Claims

1. A relay control circuit for a charging station, characterized in that Comprise: Intermediate relay circuit one, intermediate relay circuit two and intermediate relay circuit three, intermediate relay circuit one and intermediate relay circuit two connection, intermediate relay circuit two and intermediate relay circuit three connection; Intermediate relay circuit one includes: Intermediate relay one K6, foot 2 ground, intermediate relay one K6 foot 1 and one end of resistor R4 connection, resistor R4 is current limiting resistor, foot 1 and foot 2 are the coil terminal of intermediate relay one K6, the other end of resistor R4 is connected to the controller, one end of resistor R4 is connected to the anode of diode LED6, the cathode of diode LED6 is connected to the ground, intermediate relay one K6 is connected to the cathode of diode D4, the anode of diode D4 is connected to the ground; Diode D4 is a freewheeling diode, which plays a role in freewheeling, as a freewheeling path when the coil of intermediate relay one K6 is disconnected, the drive signal DC1-EN generated by the controller acts on intermediate relay one K6 through resistor R4; The foot 6 and foot 5 of intermediate relay one K6 are grounded, the foot 3 and foot 4 of intermediate relay one K6 are connected to intermediate relay circuit two, the foot 8 of intermediate relay one K6 is connected to resistor R8, and an output terminal is arranged between the foot 8 of intermediate relay one K6 and resistor R8. One end of resistor R8 is connected to the power supply, The foot 7 of intermediate relay one K6 is connected to resistor R9, an output terminal two is arranged between the foot 7 of intermediate relay one K6 and resistor R9, one end of resistor R9 is connected to the power supply, and diode LED5 is arranged between resistor R9 and foot 7. The anode of diode LED5 is connected to one end of R9, the cathode of diode LED5 is connected to the output terminal two, the output terminal two is connected to the anode of diode D6, and the cathode of diode D6 is connected to the power supply.

2. The relay control circuit for a charging station according to claim 1, characterized by, Intermediate relay circuit two includes intermediate relay two K9, the foot 3 and foot 4 of intermediate relay two K9 are normally closed contacts, and the foot 3 and foot 4 of intermediate relay one K6 are connected to the foot 3 and foot 4 of intermediate relay two K9. Intermediate relay circuit two outputs DC2-OUT- between the foot 8 of intermediate relay two K9 and resistor R12.

3. The relay control circuit for a charging station according to claim 2, characterized in that, Intermediate relay circuit two outputs DC2-OUT+ between the foot 7 of intermediate relay two K9 and resistor R13.

4. The relay control circuit for a charging station according to claim 3, characterized by, Intermediate relay circuit three includes intermediate relay three K10, which is consistent with intermediate relay two K9. Among them, intermediate relay three K10 is connected to the or gate circuit through resistor R26, the or gate circuit is connected to chip U1 and the controller, the or gate circuit includes diode D1 and diode D2, the cathode of diode D1 is connected to one end of resistor R19, the anode of diode D1 is connected to pin 4 of chip U1, pin 3 of chip U1 is grounded, pin 2 of chip U1 is connected to the controller, the controller transmits DC2-EN signal to chip U1 through pin 2, pin 1 of chip is connected to the controller, the controller transmits DC1-EN signal to chip U1 through pin 1, pin 5 of chip U1 is connected to the power supply, the other end of resistor R19 is connected to one end of resistor R20, the other end of resistor R20 is connected to the cathode of diode D2, and the anode of diode D2 is connected to the controller.

5. The relay control circuit for a charging station according to claim 4, characterized in that, One end of the resistor R26 is connected with the pin 1 of the intermediate relay three K10, the pin 2 of the intermediate relay three K10 is connected with the pin 3 and the pin 4 of the intermediate relay two K9.

6. The relay control circuit for a charging station according to claim 5, characterized in that, One end of the resistor R26 is connected with the anode of the diode LED30, and one end of the resistor R26 is connected with the cathode of the diode D15, the anode of the diode D15 is connected with the cathode of the diode LED30, the cathode of the diode D15 is connected with the anode of the diode LED30, and the anode of the diode D15 and the cathode of the diode LED30 are connected with the pin 1 of the intermediate relay three K10; the anode of the diode D15 and the cathode of the diode LED30 are connected with the pin 2 of the intermediate relay three K10 through a wire; the pin 5 and the pin 6 of the intermediate relay three K10 are grounded, the pin 8 of the intermediate relay three K10 outputs DC-P-OUT- between the resistor R29, and the pin 7 of the intermediate relay three K10 outputs DC-P-OUT+ between the resistor R30.

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