Starting method, circuit, system and equipment for power factor correction and medium

Abstract

The invention belongs to the technical field of energy storage and power supply, and particularly relates to a starting method, circuit, system, equipment and medium for power factor correction, comprising the steps of setting a preset voltage value V1 of a reference voltage input end and a preset voltage value V2 of an output end of a voltage reference chip; after input voltage of an external power supply is divided by a voltage division circuit, the input voltage is input to one input end of a voltage reference chip; the voltage reference chip compares the output voltage of the voltage division circuit with a preset voltage value V1, when the divided voltage is larger than the preset voltage value V1, the starting relay is powered on and turned on, an external power supply bypasses the current-limiting resistor to supply power to the rectifier bridge, and soft start is achieved. And when the output voltage of the voltage division circuit is smaller than a preset voltage value V2, the starting relay is powered off and closed, and an external power supply supplies power to the rectifier bridge through the current-limiting resistor, so that hysteresis type power failure is realized. According to the invention, the soft start and hysteretic power-off functions are realized by accurately controlling the start and turn-off processes of the circuit.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy storage power supply, and in particular relates to a starting method, circuit, system, equipment and medium for power factor correction. Background Art

[0002] With the development of energy storage, power factor correction has been widely used in energy storage stations and new energy vehicles. At present, the power factor correction circuit is that the 220V point directly enters the rectifier bridge, and then performs digital power factor correction or power factor correction.

[0003] With the development of the electronics industry, the reliability of the rectifier bridge has received more and more attention, and the development of energy storage is inseparable from the application of the rectifier bridge. The rectifier bridge is often an indispensable existence in the conversion of AC power into DC power, and is particularly important. However, at present, the market basically only pays attention to the parameter characteristics of the rectifier bridge, but there will be a situation of instantaneous excessive current at the moment of power-on. How to add protection before the rectifier bridge to ensure the normal operation of the subsequent circuit is a problem that technicians in this field need to solve urgently. Summary of the invention

[0004] The purpose of the present invention is to provide a starting method, circuit, system, device and medium for power factor correction to solve the problems raised in the background technology.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0006] In a first aspect, the present invention proposes a starting method for power factor correction, the starting method is applied to a starting circuit between an external power supply and a rectifier bridge, the starting circuit includes a voltage divider circuit, a voltage reference chip, a relay and a current limiting resistor, and the method includes:

[0007] S1, setting a preset voltage value V1 of a reference voltage input terminal and a preset voltage value V2 of an output terminal of a voltage reference chip;

[0008] S2, dividing the input voltage of the external power supply through the voltage divider circuit and inputting it to an input terminal of the voltage reference chip;

[0009] S3, the voltage reference chip compares the output voltage of the voltage divider circuit with the preset voltage value V1. When the voltage divider is greater than the preset voltage value V1, the start relay is powered on, and the external power supply bypasses the current limiting resistor to supply power to the rectifier bridge, thereby realizing soft start;

[0010] S4. When the output voltage of the voltage divider circuit is less than the preset voltage value V2, the start relay loses power and is closed, and the external power supply supplies power to the rectifier bridge through the current limiting resistor to achieve hysteresis power off.

[0011] In a second aspect, the present invention proposes a starting circuit for power factor correction, wherein the starting circuit is connected between an external power supply and a rectifier bridge, and is used to detect real-time voltage, and control the starting and shutting down of the starting circuit according to the real-time voltage change, and the starting circuit includes a voltage divider circuit, a current limiting resistor, a voltage reference chip, a relay and a transistor; wherein,

[0012] The E pole of the transistor Q1 is connected to the external power supply, the B pole is connected to the input end of the voltage reference chip via the current limiting resistor, the C pole is connected to one end of the relay, the other end of the relay is connected to the output end of the voltage reference chip and one end of the voltage divider circuit, and the other end of the voltage divider circuit is connected to the rectifier bridge as a DC output end.

[0013] Furthermore, a voltage detection control circuit is connected between the control end of the relay and the DC output end, and the control end of the voltage detection control circuit is connected to the control end of the voltage reference chip. A control logic is preset in the voltage detection control circuit, and the control logic includes:

[0014] When the voltage divided by the voltage divider circuit is greater than the preset voltage value V1 of the input end of the voltage reference chip, the input end of the voltage reference chip is equivalent to grounding, the PNP transistor Q1 is turned on, the start control signal is energized by 12V, the relay is turned on, and the current limiting resistor is bypassed to achieve a soft start function;

[0015] When the DC output voltage is less than the preset voltage value V2 of the output of the voltage reference chip, the output of the voltage reference chip is equivalent to a high impedance state, the PNP transistor Q1 is turned off, the start control signal is de-energized, the relay is turned off, and the power is supplied to the subsequent stage through the current limiting resistor to achieve hysteresis power off, where V2 <V1。

[0016] Furthermore, the voltage divider circuit includes a resistor R1, a resistor R3, a resistor R7 and a resistor R8 connected in series between the relay and the DC output terminal to form a voltage divider network for dividing the input voltage and outputting it to the input terminal of the voltage reference chip.

[0017] Furthermore, the starting circuit also includes a diode D1, a resistor R9, a resistor R10, a capacitor C1 and a capacitor C2; wherein the control end of the relay is connected to one end of the diode D1, the other end of the diode D1 is connected to one end of the resistor R9, the other end of the resistor R9 is connected to one end of the resistor R7 and the input end of the voltage reference chip, the resistor R10 is connected in parallel to the resistor R9, the connection point between the resistor R9 and the input end of the voltage reference chip is connected to one end of the capacitor C2, and the other end of the capacitor C2 is connected to the resistor R8 and the output end of the relay; the connection point between the capacitor C2 and the output end of the relay is connected to one end of the capacitor C1 and grounded, and the other end of the capacitor C1 is connected to the E pole of the transistor Q1.

[0018] Furthermore, the current limiting resistor includes a resistor R2, a resistor R4 and a resistor R5, wherein one end of the resistor R2 is connected to an external power supply, the other end of the resistor R2 is connected to one end of the resistor R4 and the E pole of the transistor Q1, the other end of the resistor R4 is connected to the input end of the voltage detection control circuit and one end of the resistor R5, and the other end of the resistor R5 is connected to the B pole of the transistor Q1.

[0019] In the third aspect, the present invention proposes an energy storage power supply system, which includes an external power supply, a rectifier bridge and the starting circuit described above; the starting circuit is connected between the external power supply and the rectifier bridge, and is used to control the startup and shutdown of the circuit according to the real-time voltage change, thereby realizing power factor correction of the energy storage power supply system and optimization of the power supply process.

[0020] In a fourth aspect, the present invention provides an electronic device, comprising:

[0021] A processor; a memory for storing instructions executable by the processor;

[0022] The processor is configured to execute the instructions to implement the startup method as described above.

[0023] In a fifth aspect, the present invention proposes a computer-readable storage medium. When the instructions in the computer-readable storage medium are executed by a processor of an electronic device, the electronic device can execute the startup method as described above.

[0024] The beneficial effects of the present invention are:

[0025] 1. The present invention designs a special starting circuit and introduces a voltage detection control circuit, which can monitor voltage changes in real time and accurately control the startup and shutdown of the circuit according to the preset control logic, thereby ensuring the stable operation of the power factor correction circuit under complex working conditions. When the circuit is started, the impact on the circuit at the moment of startup is reduced by gradually increasing the current, effectively protecting the circuit components and extending the service life. This function is triggered when the divided voltage is greater than the preset voltage value V1, and a smooth startup is achieved through the synergistic effect of the relay and the current limiting resistor.

[0026] 2. In the present invention, when the DC output voltage drops below the preset voltage value V2, the circuit can respond quickly and perform a power-off operation, while providing a buffer for the subsequent circuit through the current-limiting resistor to avoid damage to the circuit caused by sudden power failure. This hysteresis design enhances the safety and robustness of the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A flow chart of the startup method provided in Example 1 of the present application.

[0028] Figure 2 A system block diagram of a startup circuit provided in Example 2 of the present application;

[0029] Figure 3 This is a circuit schematic diagram of the startup circuit provided in Example 2 of the present application. DETAILED DESCRIPTION

[0030] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0031] Example 1

[0032] like Figure 1 As shown, this embodiment proposes a starting method for power factor correction, the starting method is applied to a starting circuit between an external power supply and a rectifier bridge, the starting circuit includes a voltage divider circuit, a voltage reference chip, a relay and a current limiting resistor, and the method includes:

[0033] S1, setting a preset voltage value V1 of a reference voltage input terminal and a preset voltage value V2 of an output terminal of a voltage reference chip;

[0034] S2, dividing the input voltage of the external power supply through the voltage divider circuit and inputting it to an input terminal of the voltage reference chip;

[0035] S3, the voltage reference chip compares the output voltage of the voltage divider circuit with the preset voltage value V1. When the voltage divider is greater than the preset voltage value V1, the start relay is powered on, and the external power supply bypasses the current limiting resistor to supply power to the rectifier bridge, thereby realizing soft start;

[0036] S4. When the output voltage of the voltage divider circuit is less than the preset voltage value V2, the start relay loses power and closes, and the external power supply supplies power to the rectifier bridge through the current limiting resistor to achieve hysteresis power off.

[0037] It can be understood that the specific implementation principle of the above startup method is as follows:

[0038] (1) Set the preset voltage value

[0039] First, it is necessary to set a preset voltage value V1 of the reference voltage input terminal and a preset voltage value V2 of the output terminal of the voltage reference chip. These two preset voltage values ​​are set according to actual application requirements and are used for subsequent comparison with the output voltage of the voltage divider circuit.

[0040] (2) Voltage divider circuit

[0041] The input voltage of the external power supply is divided by a voltage dividing circuit and then input to an input terminal of a voltage reference chip. The voltage dividing circuit is composed of multiple resistors connected in series to form a voltage dividing network, which is used to divide the input voltage to an appropriate range for the voltage reference chip to perform comparison and control.

[0042] (3) Voltage comparison and control

[0043] The voltage reference chip compares the output voltage of the voltage dividing circuit with a preset voltage value V1. When the output voltage of the voltage dividing circuit is greater than the preset voltage value V1, it indicates that the input voltage of the external power supply has reached or exceeded the startup threshold of the startup circuit. At this time, the voltage reference chip will output a control signal to energize and turn on the relay. After the relay is turned on, the external power supply will bypass the current limiting resistor and directly supply power to the rectifier bridge to achieve the soft startup function. During this process, the current limiting resistor plays a role in protecting circuit components and avoids the impact on the circuit caused by excessive current at startup.

[0044] (4) Hysteresis power-off control

[0045] When the output voltage of the voltage dividing circuit is less than the preset voltage value V2 (where V2 < V1), it indicates that the input voltage of the external power supply has dropped to a certain extent and a power-off operation is required to protect the circuit. At this time, the voltage reference chip will output another control signal to de-energize and turn off the relay. After the relay is turned off, the external power supply will supply power to the rectifier bridge through the current limiting resistor to achieve the hysteresis power-off function. During this process, the current limiting resistor again plays a buffering role and avoids the damage to the circuit caused by sudden power-off.

[0046] According to Embodiment 1 of the present invention, this method realizes the soft startup and hysteresis power-off functions by precisely controlling the startup and shutdown processes of the circuit. The soft startup function reduces the impact on the circuit at startup and extends the service life of circuit components; the hysteresis power-off function avoids the damage to the circuit caused by sudden power-off and improves the reliability and stability of the circuit.

[0047] Embodiment 2

[0048] As Figure 2 and Figure 3 shown, on the basis of Embodiment 1, this embodiment proposes a startup circuit for power factor correction. The startup circuit is connected between the external power supply and the rectifier bridge, used to detect the real-time voltage, and control the startup and shutdown of the startup circuit according to the change of the real-time voltage. The startup circuit includes a voltage dividing circuit, a current limiting resistor, a voltage reference chip, a relay, and a triode; where

[0049] The E pole of the transistor Q1 is connected to the external power supply, the B pole is connected to the input end of the voltage reference chip via the current limiting resistor, the C pole is connected to one end of the relay, the other end of the relay is connected to the output end of the voltage reference chip and one end of the voltage divider circuit, and the other end of the voltage divider circuit is connected to the rectifier bridge as a DC output end.

[0050] Further preferably, the control end of the relay and the DC output end are connected to a voltage detection control circuit, the control end of the voltage detection control circuit is connected to the control end of the voltage reference chip, and a control logic is preset in the voltage detection control circuit, and the control logic includes:

[0051] When the voltage divided by the voltage divider circuit is greater than the preset voltage value V1 of the input end of the voltage reference chip, the input end of the voltage reference chip is equivalent to grounding, the PNP transistor Q1 is turned on, the start control signal is energized by 12V, the relay is turned on, and the current limiting resistor is bypassed to achieve a soft start function;

[0052] When the DC output voltage is less than the preset voltage value V2 of the output of the voltage reference chip, the output of the voltage reference chip is equivalent to a high impedance state, the PNP transistor Q1 is turned off, the start control signal is de-energized, the relay is turned off, and the power is supplied to the subsequent stage through the current limiting resistor to achieve hysteresis power off, where V2 <V1。

[0053] Further preferably, the voltage divider circuit includes a resistor R1, a resistor R3, a resistor R7 and a resistor R8 connected in series between the relay and the DC output terminal to form a voltage divider network for dividing the input voltage and outputting it to the input terminal of the voltage reference chip.

[0054] Further preferably, the starting circuit also includes a diode D1, a resistor R9, a resistor R10, a capacitor C1 and a capacitor C2; wherein the control end of the relay is connected to one end of the diode D1, the other end of the diode D1 is connected to one end of the resistor R9, the other end of the resistor R9 is connected to one end of the resistor R7 and the input end of the voltage reference chip, the resistor R10 is connected in parallel to the resistor R9, the connection point between the resistor R9 and the input end of the voltage reference chip is connected to one end of the capacitor C2, and the other end of the capacitor C2 is connected to the resistor R8 and the output end of the relay; the connection point between the capacitor C2 and the output end of the relay is connected to one end of the capacitor C1 and grounded, and the other end of the capacitor C1 is connected to the E pole of the transistor Q1.

[0055] Further preferably, the current-limiting resistor includes resistor R2, resistor R4, and resistor R5. One end of resistor R2 is connected to an external power supply, and the other end of resistor R2 is connected to one end of resistor R4 and the E pole of triode Q1. The other end of resistor R4 is connected to the input end of the voltage detection and control circuit and one end of resistor R5. The other end of resistor R5 is connected to the B pole of triode Q1.

[0056] It can be understood that the system working logic of the above startup circuit in specific implementation is as follows:

[0057] 1. When the system is powered on, the external power supply supplies power to the subsequent power factor correction circuit through the current-limiting resistor, and the voltage is output after power factor correction;

[0058] 2. Start the detection and control circuit. When the DC output rises to V1, it is divided by resistors R1, R3, R7, and R8, and the divided voltage is applied to VREF of U1. When the divided voltage is greater than 2.5V, the K terminal of U1 is equivalent to being grounded, the PNP triode Q1 is turned on, the startup control signal is powered on to 12V, the relay is turned on, the current-limiting resistor is bypassed, and the soft start function is realized.

[0059] 3. When a fault occurs in the subsequent stage output, when the DC output voltage drops to V2, where 12V_DC is the external constant power supply, and the DC output voltage and the 12V voltage of the startup control signal, the two voltages act together on VREF of U1 through resistor voltage division. The divided voltage is less than 2.5V, the K terminal of U1 is equivalent to a high impedance state, the PNP triode Q1 is turned off, the startup control signal loses power, the relay is turned off, and the subsequent stage is powered by the current-limiting resistor, where V2 < V1, thus realizing hysteretic power-off.

[0060] Embodiment 3

[0061] Based on Embodiment 2, this embodiment proposes an energy storage power supply system, which includes an external power supply, a rectifier bridge, and the above startup circuit; the startup circuit is connected between the external power supply and the rectifier bridge, and is used to control the startup and shutdown of the circuit according to the change of the real-time voltage, so as to optimize the power factor correction and power supply process of the energy storage power supply system.

[0062] Embodiment 4

[0063] This embodiment proposes an electronic device, including:

[0064] A processor; a memory for storing executable instructions of the processor;

[0065] Wherein, the processor is configured to execute the instructions to implement the startup method as described in Embodiment 1.

[0066] Embodiment 5

[0067] This embodiment provides a computer-readable storage medium. When the instructions in the computer-readable storage medium are executed by the processor of the electronic device in Embodiment 4, the electronic device can execute the startup method as described in any one of Embodiment 1.

[0068] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0069] In addition, each functional module in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0070] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in the embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0071] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A starting method for power factor correction, characterized in that: The startup method is applied to a startup circuit between an external power supply and a rectifier bridge, wherein the startup circuit includes a voltage divider circuit, a voltage reference chip, a relay, and a current limiting resistor. The method includes: S1, setting a preset voltage value V1 of a reference voltage input terminal and a preset voltage value V2 of an output terminal of a voltage reference chip; S2, dividing the input voltage of the external power supply through the voltage divider circuit and inputting it to an input terminal of the voltage reference chip; S3, the voltage reference chip compares the output voltage of the voltage divider circuit with the preset voltage value V1. When the voltage divider is greater than the preset voltage value V1, the start relay is powered on, and the external power supply bypasses the current limiting resistor to supply power to the rectifier bridge, thereby realizing soft start; S4. When the output voltage of the voltage divider circuit is less than the preset voltage value V2, the start relay loses power and closes, and the external power supply supplies power to the rectifier bridge through the current limiting resistor to achieve hysteresis power off.

2. A starting circuit for power factor correction, characterized in that: The startup circuit is connected between the external power supply and the rectifier bridge, and is used to detect the real-time voltage and control the startup and shutdown of the startup circuit according to the real-time voltage change. The startup circuit includes a voltage divider circuit, a current limiting resistor, a voltage reference chip, a relay and a transistor; wherein, The E pole of the transistor Q1 is connected to the external power supply, the B pole is connected to the input end of the voltage reference chip via the current limiting resistor, the C pole is connected to one end of the relay, the other end of the relay is connected to the output end of the voltage reference chip and one end of the voltage divider circuit, and the other end of the voltage divider circuit is connected to the rectifier bridge as a DC output end.

3. A starting circuit for power factor correction according to claim 2, characterized in that: The control end of the relay and the DC output end are connected to a voltage detection control circuit, the control end of the voltage detection control circuit is connected to the control end of the voltage reference chip, and the voltage detection control circuit is preset with a control logic, and the control logic includes: When the voltage divided by the voltage divider circuit is greater than the preset voltage value V1 of the input end of the voltage reference chip, the input end of the voltage reference chip is equivalent to grounding, the PNP transistor Q1 is turned on, the start control signal is energized by 12V, the relay is turned on, and the current limiting resistor is bypassed to achieve a soft start function; When the DC output voltage is less than the preset voltage value V2 of the output of the voltage reference chip, the output of the voltage reference chip is equivalent to a high impedance state, the PNP transistor Q1 is turned off, the start control signal is de-energized, the relay is turned off, and the power is supplied to the subsequent stage through the current limiting resistor to achieve hysteresis power off, where V2 <V1。 4. A starting circuit for power factor correction according to claim 3, characterized in that: The voltage divider circuit includes a resistor R1, a resistor R3, a resistor R7 and a resistor R8 connected in series between the relay and the DC output terminal, forming a voltage divider network for dividing the input voltage and outputting it to the input terminal of the voltage reference chip.

5. A starting circuit for power factor correction according to claim 4, characterized in that: The starting circuit also includes a diode D1, a resistor R9, a resistor R10, a capacitor C1 and a capacitor C2; wherein the control end of the relay is connected to one end of the diode D1, the other end of the diode D1 is connected to one end of the resistor R9, the other end of the resistor R9 is connected to one end of the resistor R7 and the input end of the voltage reference chip, the resistor R10 is connected in parallel to the resistor R9, the connection point between the resistor R9 and the input end of the voltage reference chip is connected to one end of the capacitor C2, the other end of the capacitor C2 is connected to the resistor R8 and the output end of the relay; the connection point between the capacitor C2 and the output end of the relay is connected to one end of the capacitor C1 and grounded, and the other end of the capacitor C1 is connected to the E pole of the transistor Q1.

6. A starting circuit for power factor correction according to claim 5, characterized in that: The current limiting resistor includes a resistor R2, a resistor R4 and a resistor R5, wherein one end of the resistor R2 is connected to an external power supply, the other end of the resistor R2 is connected to one end of the resistor R4 and the E pole of the transistor Q1, the other end of the resistor R4 is connected to the input end of the voltage detection control circuit and one end of the resistor R5, and the other end of the resistor R5 is connected to the B pole of the transistor Q1.

7. An energy storage power supply system, characterized in that: The system includes an external power supply, a rectifier bridge, and a starting circuit as described in any one of claims 2 to 6; the starting circuit is connected between the external power supply and the rectifier bridge, and is used to control the startup and shutdown of the circuit according to real-time voltage changes, thereby achieving power factor correction of the energy storage power supply system and optimization of the power supply process.

8. An electronic device, characterized in that: include: processor; a memory for storing instructions executable by the processor; The processor is configured to execute the instructions to implement the startup method as claimed in claim 1.

9. A computer-readable storage medium, characterized in that: When the instructions in the computer-readable storage medium are executed by a processor of an electronic device, the electronic device is enabled to execute the startup method as claimed in any one of claims 1.

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