CN216162616U

CN216162616U - Control circuit for power factor correction and switching power supply

Info

Publication number: CN216162616U
Application number: CN202122206767.8U
Authority: CN
Inventors: 杜燕清
Original assignee: Shenzhen Jiuding Technology Co ltd
Current assignee: Shenzhen Jiuding Technology Co ltd
Priority date: 2021-09-13
Filing date: 2021-09-13
Publication date: 2022-04-01
Anticipated expiration: 2031-09-13

Abstract

The utility model provides a control circuit and a switching power supply for power factor correction, which belong to the technical field of power supplies, and the control circuit for power factor correction comprises: rectifier module, step-up and step-down module, first electric capacity module, second electric capacity module and sampling resistance module, wherein, rectifier module respectively with first electric capacity module and step-up and step-down module are connected, step-up and step-down module respectively with second electric capacity module with the sampling resistance module is connected, sampling resistance module keeps away from the one end ground connection of step-up and step-down module is connected, through detecting the pressure differential of sampling resistance module to the earthing terminal, can calculate the operating current in the current circuit to through adjusting the PWM duty cycle, control the operating current of main loop, thereby reach power factor's correction, and restriction impulse current's purpose.

Description

Control circuit for power factor correction and switching power supply

Technical Field

The utility model relates to the technical field of power supplies, in particular to a control circuit for power factor correction and a switching power supply.

Background

A Switching Mode Power Supply (SMPS), also called as a switching Power Supply (SMPS), is a high-frequency Power conversion device, which is a Power Supply and functions to convert a voltage of one level into a voltage or a current required by a user terminal through different types of architectures. The input of the switching power supply is mostly an ac power supply (e.g., commercial power) or a dc power supply, and the output is mostly equipment requiring a dc power supply, such as a personal computer, and the switching power supply performs voltage and current conversion between the two.

When the current switching power supply is electrified for the first time, the HV capacitor is charged instantly when the power supply is electrified, namely short circuit occurs, the instant impact current is theoretically infinite, the impact current can cause a lot of hazards, for example, the electrical equipment can be overheated or damaged due to the large short circuit current, and the voltage in the network is greatly reduced, so that the normal work of the electrical equipment in the network is damaged.

SUMMERY OF THE UTILITY MODEL

In view of the foregoing problems, in a first aspect, an embodiment of the present invention provides a control circuit for power factor correction, including: rectifier module, step up and down and press module, first electric capacity module, second electric capacity module and sampling resistance module, wherein, rectifier module respectively with first electric capacity module and step up and down press the module to be connected, step up and down press the module respectively with second electric capacity module with the sampling resistance module is connected, sampling resistance module keeps away from the one end ground connection of step up and down the module is connected.

In one embodiment, the rectifying module comprises a diode D1, a diode D2, a diode D3 and a diode D4, and the diode D1, the diode D2, the diode D3 and the diode D4 form a bridge rectifying circuit.

In one embodiment, the first capacitor module includes a capacitor C1, and the capacitor C1 is connected in parallel to one side of the bridge rectifier circuit.

In one embodiment, the buck-boost module includes a fet Q1, a fet Q2, a fet Q3, a fet Q4, and an inductor L1, wherein a drain of the fet Q1 is connected to the rectifier module, a source of the fet Q1 is connected to a drain of the fet Q3, a source of the fet Q3 is connected to a source of the fet Q4, a drain of the fet Q4 is connected to a source of the fet Q2, a first end of the inductor L1 is connected between the fet Q1 and the fet Q3, and a second end of the inductor L1 is connected between the fet Q2 and the fet Q4.

In one embodiment, the second capacitor module comprises a capacitor C2, and the drain of the field effect transistor Q2 is connected to the capacitor C2.

In one embodiment, the sampling resistor module includes a sampling resistor R1, a first end of the sampling resistor R1 is connected between the field effect transistor Q3 and the field effect transistor Q4, and a second end of the sampling resistor R1 is connected to ground.

In one embodiment, the fet Q2 and the fet Q3 may be replaced by diodes.

In a second aspect, embodiments of the present invention provide a switching power supply including a control circuit for power factor correction as described in the above aspect.

One or more technical solutions in the embodiments of the present application have at least one or more of the following technical effects:

an embodiment of the present invention provides a control circuit for power factor correction, including: rectifier module, step-up and step-down module, first electric capacity module, second electric capacity module and sampling resistance module, wherein, rectifier module is used for converting the alternating current into the direct current, and first electric capacity module is used for supplying power, and second electric capacity module is used for providing stable energy for load output, step-up and step-down module is used for the basis the voltage adjustment voltage of rectifier module output, sampling resistance module is used for sampling voltage, through detecting the voltage difference of sampling resistance module to the earthing terminal, can calculate the operating current in the current circuit to through adjusting the PWM duty cycle, control the operating current of main loop, thereby reach power factor's correction, and restriction impulse current's purpose.

The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of a circuit module according to an embodiment of the utility model;

fig. 2 is a schematic circuit diagram according to an embodiment of the present invention.

Description of reference numerals: 100. a rectification module; 200. a buck-boost module; 300. a first capacitive module; 400. a second capacitive module; 500. and a sampling resistance module.

Detailed Description

The technical scheme provided by the utility model has the following general idea:

referring to fig. 1 to 2, the control circuit for power factor correction includes: the rectifier module 100, the buck-boost module 200, the first capacitor module 300, the second capacitor module 400 and the sampling resistor module 500, wherein the rectifier module 100 is connected to the first capacitor module 300 and the buck-boost module 200, the buck-boost module 200 is connected to the second capacitor module 400 and the sampling resistor module 500, one end of the sampling resistor module 500 away from the buck-boost module 200 is connected to ground, wherein the rectifier module 100 is used for converting alternating current into direct current, the first capacitor module 300 is used for supplying power, the second capacitor module 400 is used for providing stable energy for load output, the buck-boost module 200 is used for adjusting voltage according to the voltage at the output end of the rectifier module 100, the sampling resistor module 500 is used for sampling voltage, by detecting the voltage difference of the sampling resistor module 500 to ground, the working current in the current line can be calculated, and by adjusting the PWM duty ratio, the working current of the main loop is controlled, so that the purposes of correcting the power factor and limiting the impact current are achieved.

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Specifically, the rectifier module 100 includes a diode D1, a diode D2, a diode D3, and a diode D4, and the diode D1, the diode D2, the diode D3, and the diode D4 form a bridge rectifier circuit.

Specifically, the first capacitor module 300 includes a capacitor C1, a capacitor C1 is connected in parallel to one side of the bridge rectifier circuit, and a capacitor C1 is a small-capacity capacitor, mainly a capacitor for supplying power to the driving circuit.

Referring to fig. 2, the buck-boost module 200 includes a fet Q1, a fet Q2, a fet Q3, a fet Q4, and an inductor L1, wherein a drain of the fet Q1 is connected to the rectifier module 100, a source of the fet Q1 is connected to a drain of the fet Q3, a source of the fet Q3 is connected to a source of the fet Q4, a drain of the fet Q4 is connected to a source of the fet Q2, a first end of the inductor L1 is connected between the fets Q1 and Q3, and a second end of the inductor L1 is connected between the fets Q2 and Q4.

Specifically, the field-effect transistor Q1, the field-effect transistor Q2, the field-effect transistor Q3, the field-effect transistor Q4, and the inductor L form a step-up/step-down circuit, please refer to fig. 2, when the voltage at the VIN terminal is higher than the voltage at the HV terminal, the field-effect transistor Q1 and the field-effect transistor Q3 are driven by PWM, the field-effect transistor Q2 is turned on, the field-effect transistor Q4 is turned off, and at this time, the step-down circuit is formed; when the voltage at the VIN end is lower than that at the HV end, the field effect transistor Q1 is switched on, the field effect transistor Q3 is switched off, and the field effect transistor Q2 and the field effect transistor Q4 are controlled by PWM, and are taken as a booster circuit.

Further, the second capacitor module 400 includes a capacitor C2, and the drain of the fet Q2 is connected to the capacitor C2, and optionally, the capacitor C2 is a large-capacity capacitor, and mainly provides stable energy for the load output.

Further, the sampling resistor module 500 includes a sampling resistor R1, a first end of the sampling resistor R1 is connected between the fet Q3 and the fet Q4, a second end of the sampling resistor R1 is connected to ground, the working current in the current line can be calculated by detecting a voltage difference between the sampling resistor R1 and the ground, and the working current of the main loop is controlled by adjusting the PWM duty cycle, so as to achieve the purpose of power factor correction and limiting the inrush current.

Further, the field effect transistor Q2 and the field effect transistor Q3 can be replaced by diodes, and specifically, the diodes are used for replacing the field effect transistor Q2 and the field effect transistor Q3 and used as asynchronous buck-boost, so that the cost can be reduced.

The embodiment of the present invention further provides a switching power supply, which includes a control circuit for power factor correction as in the foregoing embodiments, and various variations and specific embodiments in the foregoing embodiments are also applicable to a switching power supply of this embodiment, and through the foregoing detailed description of a control circuit for power factor correction, a method for implementing a switching power supply in this embodiment is clear to those skilled in the art, and therefore, for the sake of brevity of the description, detailed descriptions are omitted here.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the utility model.

It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the utility model. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to encompass such modifications and variations.

Claims

1. A control circuit for power factor correction, comprising: rectifier module, step up and down and press module, first electric capacity module, second electric capacity module and sampling resistance module, wherein, rectifier module respectively with first electric capacity module and step up and down press the module to be connected, step up and down press the module respectively with second electric capacity module with the sampling resistance module is connected, sampling resistance module keeps away from the one end ground connection of step up and down the module is connected.

2. The control circuit for power factor correction of claim 1, wherein the rectification module comprises a diode D1, a diode D2, a diode D3 and a diode D4, and the diode D1, the diode D2, the diode D3 and the diode D4 form a bridge rectification circuit.

3. The control circuit of claim 2, wherein the first capacitor module comprises a capacitor C1, and the capacitor C1 is connected in parallel to one side of the bridge rectifier circuit.

4. The control circuit for power factor correction of claim 1, wherein the buck-boost module comprises a fet Q1, a fet Q2, a fet Q3, a fet Q4 and an inductor L1, wherein a drain of the fet Q1 is connected to the rectifier module, a source of the fet Q1 is connected to a drain of the fet Q3, a source of the fet Q3 is connected to a source of the fet Q4, a drain of the fet Q4 is connected to a source of the fet Q2, a first end of the inductor L1 is connected between the fet Q1 and the fet Q3, and a second end of the inductor L1 is connected between the fet Q2 and the fet Q4.

5. The control circuit according to claim 4, wherein the second capacitor module comprises a capacitor C2, and the drain of the FET Q2 is connected to the capacitor C2.

6. The control circuit of claim 4, wherein the sampling resistor module comprises a sampling resistor R1, a first terminal of the sampling resistor R1 is connected between the FET Q3 and the FET Q4, and a second terminal of the sampling resistor R1 is connected to ground.

7. The control circuit for power factor correction of claim 4, wherein said FET Q2 and said FET Q3 are both diode-substituted.

8. A switching power supply comprising a control circuit for power factor correction as claimed in any one of claims 1 to 7.