Double-input power frequency power supply circuit, power supply control method and charge and discharge gun

Abstract

The invention provides a double-input power frequency power supply circuit, a power supply control method and a charging and discharging gun, and relates to the technical field of power supply circuits. The double-input power frequency power supply circuit comprises a first input circuit, a second input circuit and a power frequency transformer; the control circuit A is connected between the protection circuit A and a first input winding of the industrial frequency transformer, the second input circuit comprises a protection circuit B and a control circuit B, and the control circuit B is connected between the protection circuit B and a second input winding of the industrial frequency transformer and is output by the same output winding of the industrial frequency transformer. The power supply control method is based on the double-input power frequency power supply circuit, two input working circuits do not work at the same time, output is achieved through the same output interface, and the charging and discharging gun comprises the double-input power frequency power supply circuit used for supplying power to the circuit board. The problem of double-input single-output power supply is solved through simple circuits and devices, and the circuit board power supply circuit can be used for circuit board power supply of charging and discharging equipment.

Description

Technical Field

[0001] This invention relates to the field of power supply circuit technology, specifically to a dual-input power frequency power supply circuit, a power supply control method, and a charging / discharging gun. Background Technology

[0002] Electric vehicles have generally acquired charging and discharging capabilities. Currently, they are typically equipped with separate charging guns and discharging power strips. To improve user experience and reduce wiring harness configuration and costs, integrated charging and discharging cables can be used. Therefore, when supplying power to the circuit board inside the integrated charging and discharging cable, there will be power inputs from both ends, requiring the power module to accept dual inputs.

[0003] Currently, two independent power modules are typically used, each connected to the power inputs at both ends of the charge / discharge integrated circuit, to power the circuit board. The circuit board also requires two corresponding input interfaces. Therefore, in order to achieve power supply for the integrated charge / discharge circuit board, existing technologies require two independent power modules. This results in a large overall power module size, a correspondingly larger circuit board design, which is not conducive to miniaturized, highly integrated circuit board layouts, and also increases costs. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a dual-input power frequency power supply circuit, a power supply control method, and a charging and discharging gun, which solves the power supply problem of dual input single output through simple circuits and devices, and can be used to power the circuit board of charging and discharging equipment.

[0005] To achieve the above technical objectives, the adopted technical solution is: a dual-input power frequency power supply circuit, including a first input circuit, a second input circuit, and a power frequency transformer. The first input circuit includes a protection circuit A for limiting inrush current and inrush voltage during startup, and a control circuit A for converting input AC to DC and enabling the input circuit to conduct. The control circuit A is connected between the protection circuit A and the first input winding of the power frequency transformer. The second input circuit includes a protection circuit B for limiting inrush current and inrush voltage during startup, and a control circuit B for converting input AC to DC and enabling the input circuit to conduct. The control circuit B is connected between the protection circuit B and the second input winding of the power frequency transformer. When either the first or second input circuit has an input, the same output winding of the power frequency transformer outputs the power.

[0006] Furthermore, the protection circuit A or protection circuit B consists of a positive temperature coefficient thermistor and a varistor. The positive temperature coefficient thermistor is placed on the input live wire or neutral wire, and the two ends of the varistor are respectively connected to the input live wire and neutral wire.

[0007] Furthermore, the positive temperature coefficient thermistor is located in front of the varistor, or the positive temperature coefficient thermistor is located behind the varistor.

[0008] Furthermore, the control circuit A or control circuit B consists of a rectifier circuit, a current limiting circuit, and a thyristor optocoupler. The input terminals of the rectifier circuit, the current limiting circuit, and the thyristor optocoupler form a loop. The current limiting circuit is connected between the output terminal of the rectifier circuit and the input terminal of the thyristor optocoupler. The output terminal of the thyristor optocoupler is connected to the input winding of the power frequency transformer.

[0009] Furthermore, the rectifier circuit is a rectifier bridge.

[0010] Furthermore, the current-limiting circuit is a current-limiting resistor.

[0011] A power supply control method is based on a dual-input power frequency power supply circuit; when either the first input working circuit or the second input working circuit has an input, the other input working circuit is not working, and the first input working circuit and the second input working circuit output through the same output winding of the power frequency transformer.

[0012] A charging / discharging gun includes the aforementioned dual-input power frequency power supply circuit for supplying power to a circuit board.

[0013] A charging gun includes a cable, a plug connected to one end of the cable, and a charging gun head connected to the other end of the cable. The charging gun head integrates a dual-input power frequency power supply circuit and a circuit board integrating other functional circuits.

[0014] Beneficial effects of this invention: 1. A dedicated circuit solves the problem of dual-input, single-output in integrated charging and discharging equipment, reducing the overall cost of charging and discharging products. The structure is simple and easy to use. An input control circuit controls both inputs, sharing a single power frequency transformer, ensuring one output. The two inputs are isolated from each other, preventing interference. This reduces the size of the power supply circuit, resulting in a smaller circuit board, which is beneficial for miniaturized integration.

[0015] 2. The protection circuit uses positive temperature coefficient thermistors and varistors, which are small in size, low in cost, and have good performance, effectively limiting the surge current and surge voltage during startup.

[0016] 3. Integrating a thyristor optocoupler into the input circuit ensures that the two input circuits do not interfere with each other. When using one input circuit, the other circuit is prevented from being energized, thus improving safety.

[0017] 4. In this dual-input power frequency power supply circuit, the first input working circuit and the second input working circuit use the same output winding for output, which is convenient and the two input working circuits do not interfere with each other.

[0018] 5. Using a dual-input power frequency circuit in a charge / discharge gun can reduce the size of the charge / discharge gun with charging and discharging functions. Integrating the circuit board and the dual-input power frequency circuit together in the charge / discharge gun can improve the integration level of the charge / discharge gun. Attached Figure Description

[0019] Figure 1 This is a block diagram illustrating the control principle of the dual-input power frequency power supply circuit of the present invention. Figure 2 This is a circuit diagram of the dual-input power frequency power supply circuit of the present invention. Detailed Implementation

[0020] The preferred embodiments of the invention are given below with reference to the accompanying drawings to illustrate the technical solution of the invention in detail. The invention will be described in detail here with reference to the accompanying drawings. It should be particularly noted that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit or restrict the invention. Furthermore, the terms "first" and "second" are used only to distinguish similar objects and should not be construed as a specific order or sequence; such use should be understood to be interchangeable where appropriate.

[0021] like Figure 1 As shown, a dual-input power frequency power supply circuit includes a first input circuit, a second input circuit, and a power frequency transformer. The first input circuit includes a protection circuit A for limiting inrush current and inrush voltage during startup, and a control circuit A for converting input AC to DC and enabling the input circuit to conduct. The control circuit A is connected between the protection circuit A and the first input winding of the power frequency transformer. The protection circuit A is used for protection of input port A. The control circuit A is used to control the connection of the first input winding of the power frequency transformer when there is voltage at input A. The second input circuit includes a protection circuit B for limiting inrush current and inrush voltage during startup, and a control circuit B for converting input AC to DC and enabling the input circuit to conduct. The control circuit B is connected between the protection circuit B and the second input winding of the power frequency transformer. The protection circuit B is used for protection of input port B. The control circuit B is used to control the connection of the second input winding of the power frequency transformer when there is voltage at input B. When either the first or second input circuit has an input, the output is from the same output winding of the power frequency transformer.

[0022] like Figure 2 As shown, the power frequency transformer has two input interfaces, L1 / NIN1 and L2 / NIN2. L1 / NIN1 is connected to L1 and NIN1 of protection circuit A, respectively, and L2 / NIN2 is connected to L2 and NIN2 of protection circuit B, respectively. It has only one output, LOUT / NOUT. The two input interfaces of the power frequency transformer correspond to two windings, which are on the same magnetic core. It has only one output winding and only one output interface.

[0023] Protection circuit A or protection circuit B consists of a positive temperature coefficient thermistor and a varistor. The positive temperature coefficient thermistor is placed on the input live wire or neutral wire, and the two ends of the varistor are connected to the input live wire and neutral wire respectively. Figure 2 As shown, protection circuit A consists of a positive temperature coefficient thermistor R3 and a varistor RV1. The positive temperature coefficient thermistor R3 is connected to the input live wire LIN1, or it can be connected to the neutral wire NIN1. The two ends of the varistor RV1 are connected to the input live wire LIN1 and the neutral wire NIN1, respectively. Protection circuit B consists of a positive temperature coefficient thermistor R6 and a varistor RV2. The positive temperature coefficient thermistor R6 is connected to the input live wire LIN2, or it can be connected to the neutral wire NIN2. The two ends of the varistor RV2 are connected to the input live wire LIN2 and the neutral wire NIN2, respectively.

[0024] like Figure 2 As shown, the positive temperature coefficient thermistor is located in front of the varistor, or the positive temperature coefficient thermistor is located behind the varistor. Swapping the positions of the positive temperature coefficient thermistor and varistor does not affect the use of the protection circuit.

[0025] Control circuit A or control circuit B consists of a rectifier circuit, a current limiting circuit, and a thyristor optocoupler. The input terminals of the rectifier circuit, current limiting circuit, and thyristor optocoupler form a loop. The current limiting circuit is connected between the output terminal of the rectifier circuit and the input terminal of the thyristor optocoupler. The output terminal of the thyristor optocoupler is connected to the input winding of the power frequency transformer. The thyristor optocoupler in control circuit A is U1, and the thyristor optocoupler in control circuit B is U2. Because of the unidirectional conductivity generated by the structure of control circuits A and B, the problem of voltage induced in the other winding when there is an input voltage in one winding of the power frequency transformer is solved, preventing the voltage from being transmitted to the input terminal of the other winding.

[0026] The rectifier circuit is a rectifier bridge. The rectifier bridge has two AC input pins, which are not distinguishable by positive or negative, and one positive output pin and one negative output pin. The rectifier circuit of control circuit A is rectifier bridge BD1, and the rectifier circuit of control circuit B is rectifier bridge BD2. Pins 2 and 4 of rectifier bridge BD1 are input pins, and pins 1 and 3 are output pins. Pin 1 is the positive output pin, and pin 3 is the negative output pin.

[0027] The current-limiting circuit consists of current-limiting resistors. In control circuit A, the current-limiting circuit consists of current-limiting resistors R1 and R2, while in control circuit B, it consists of current-limiting resistors R4 and R5. Only one current-limiting resistor needs to be retained in the current-limiting circuit, as long as the current does not damage the rectifier bridge and the SCR optocoupler.

[0028] The input ports of protection circuit A are LIN1 and NIN1, connected to one AC input. LIN1 sequentially passes through devices R3, the AC input of BD1, R1, U1, R2, the output of BD1, and NIN1 in control circuit A. This loop makes the input of U1 conduct. When the input of U1 is conducting, the output of U1 is also conducting. At this time, L1 and LIN1 are conducting, the first input of the power frequency transformer L1 and NIN1 are energized, and the power frequency transformer has an output.

[0029] The input ports of protection circuit B are LIN2 and NIN2, which are connected to another AC input. LIN2 passes sequentially through control circuit B's R6, the AC input of BD2, R4, U2, R5, the output of BD2, and NIN2. This loop makes the input of U2 conduct. When the input of U2 is conducting, the output of U2 is also conducting. At this time, L2 and LIN2 are conducting, the second input of the power frequency transformer L2 and NIN2 are energized, and the transformer has an output.

[0030] Whether input A or input B is energized, the power frequency transformer will have an output. When input A is energized, the first input winding of the power frequency transformer has voltage. Because the second input winding shares a magnetic core with the first input winding, an induced electromotive force will be generated in the second input winding. However, due to the isolation effect of the SCR optocoupler U2, when there is voltage at the output terminal of the SCR optocoupler U2, it cannot conduct to the input terminal of the SCR optocoupler U2, thus preventing input B from becoming energized. Similarly, when input B is energized, input A will not become energized. The isolation function is mainly to solve the problem when using the charging function, with input A connected to household mains power, and input B connected to the vehicle terminal but not yet connected to the vehicle. Without the reverse non-conducting function of the SCR optocoupler U2, input B would be energized by input A, causing the vehicle plug at input B to become energized. If the user accidentally touches the vehicle plug, there is a risk of electric shock. Similarly, during discharge, it prevents the user from accidentally touching the energized part of input A when input B is connected to the vehicle for discharge, thus avoiding the risk of electric shock.

[0031] A power supply control method is based on a dual-input power frequency power supply circuit; when either the first input working circuit or the second input working circuit has an input, the other input working circuit is not working, and the first input working circuit and the second input working circuit output through the same output winding of the power frequency transformer.

[0032] A charging / discharging gun includes a dual-input power supply circuit for supplying power to a circuit board. The circuit board can be integrated within the charging / discharging gun or located outside of it. The circuit board has functions such as power supply, indicator light display, and leakage current display.

[0033] A charging gun includes a cable, a plug connected to one end of the cable, and a charging gun head connected to the other end of the cable. The charging gun head integrates a dual-input power frequency power supply circuit and a circuit board integrating other functional circuits, achieving an integrated design.

[0034] The above are merely preferred embodiments of the present invention and are not intended to limit or restrict the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection declared by the present invention.

Claims

1. A dual-input power frequency power supply circuit, characterized in that: The circuit includes a first input circuit, a second input circuit, and a power frequency transformer. The first input circuit includes a protection circuit A for limiting inrush current and inrush voltage during startup, and a control circuit A for converting the input AC to DC and enabling the input circuit to conduct. The control circuit A is connected between the protection circuit A and the first input winding of the power frequency transformer. The second input circuit includes a protection circuit B for limiting inrush current and inrush voltage during startup, and a control circuit B for converting the input AC to DC and enabling the input circuit to conduct. The control circuit B is connected between the protection circuit B and the second input winding of the power frequency transformer. When either the first or second input circuit has an input, the same output winding of the power frequency transformer outputs the signal.

2. The dual-input power frequency power supply circuit as described in claim 1, characterized in that: The protection circuit A or protection circuit B consists of a positive temperature coefficient thermistor and a varistor. The positive temperature coefficient thermistor is placed on the input live wire or neutral wire, and the two ends of the varistor are connected to the input live wire and neutral wire respectively.

3. The dual-input power frequency power supply circuit as described in claim 2, characterized in that: The positive temperature coefficient thermistor is located in front of the varistor, or the positive temperature coefficient thermistor is located behind the varistor.

4. The dual-input power frequency power supply circuit as described in claim 1, characterized in that: The control circuit A or control circuit B consists of a rectifier circuit, a current limiting circuit, and a thyristor optocoupler. The input terminals of the rectifier circuit, the current limiting circuit, and the thyristor optocoupler form a loop. The current limiting circuit is connected between the output terminal of the rectifier circuit and the input terminal of the thyristor optocoupler. The output terminal of the thyristor optocoupler is connected to the input winding of the power frequency transformer.

5. A dual-input power frequency power supply circuit as described in claim 1, characterized in that: The rectifier circuit mentioned is a rectifier bridge.

6. The dual-input power frequency power supply circuit as described in claim 1, characterized in that: The current-limiting circuit mentioned above is a current-limiting resistor.

7. A power supply control method, characterized in that: Based on any one of the dual-input power frequency power supply circuits as described in claims 1-6; when either the first input working circuit or the second input working circuit has an input, the other input working circuit does not work, and the first input working circuit and the second input working circuit output through the same output winding of the power frequency transformer.

8. A charging and discharging gun, characterized in that: Includes a dual-input power frequency power supply circuit for supplying power to the circuit board as described in any one of claims 1-6.

9. A charging / discharging gun as described in claim 8, characterized in that: It includes a cable, a plug connected to one end of the cable, and a charging gun head connected to the other end of the cable. The charging gun head integrates a dual-input power frequency power supply circuit and a circuit board that integrates other functional circuits.

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