Unlock instant, AI-driven research and patent intelligence for your innovation.

Active PFC circuit and control method thereof

A control method and circuit technology, applied in the direction of control/regulation system, electrical components, and adjustment of electrical variables, etc., can solve the problems that the boost value cannot change with the input voltage, the output voltage is fixed, etc., and achieve low cost, simple control, and application flexible effects

Active Publication Date: 2014-10-22
GD MIDEA AIR-CONDITIONING EQUIP CO LTD
View PDF4 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an active PFC circuit and its control method, aiming to solve the technical problems that the output voltage of the existing active PFC circuit is fixed and the boost value cannot change with the input voltage

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Active PFC circuit and control method thereof
  • Active PFC circuit and control method thereof
  • Active PFC circuit and control method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0021] figure 2 It is a structural block diagram of the active PFC circuit provided by the embodiment of the present invention; for the convenience of description, only the parts related to this embodiment are shown, as shown in the figure:

[0022] An active PFC circuit, including a main power supply unit 100, a PFC unit 200, a filter unit 300 connected to a load, and an output voltage sampling unit 400. As an improvement, the active PFC circuit also includes:

[0023] An AC voltage sampling unit 500 connected to the main power supply unit 100 and sampling the input AC voltage;

[0024] A curre...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention belongs to the field of power supply devices of electric appliances, and particularly relates to an active PFC circuit and a control method thereof. According to the active PFC circuit and the control method thereof, a voltage-regulating PWM signal outputted by an output voltage regulating unit can be regulated and corrected via a single-chip microcomputer in the output voltage regulating unit according to change of AC voltage so that DC voltage outputted to a load is enabled to change along with change of input voltage, and an application occasion that AC input voltage constantly changes can be adapted. Therefore, power factor of the overall electric appliance is enhanced, cost is low, application is flexible, control is simple and reliability is high.

Description

technical field [0001] The invention belongs to the field of electric power supply devices, and in particular relates to an active PFC circuit and a control method thereof. Background technique [0002] Air conditioners and other electrical equipment have a rectifier circuit that converts AC voltage into DC voltage inside, thereby forming a DC power supply, and then supplying power to various electronic circuits. Most of these rectifier circuits are capacitive input types, and their input current only flows near the peak voltage waveform and presents a pulse-like current waveform, thus generating different degrees of harmonics. The appearance of harmonics will lead to distortion of the voltage waveform, abnormal heating of the phase-advancing capacitor, increased noise of the motor or transformer, and reduced capacity of the powered equipment. On the other hand, in an AC circuit, the cosine of the phase difference (Φ) between the voltage and the current is called the power ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H02M1/42H02M3/156
CPCY02B70/10
Inventor 倪霞王伍平
Owner GD MIDEA AIR-CONDITIONING EQUIP CO LTD