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Control signal generation method of power factor correction circuit, control device and power supply

A technology of power factor correction and control device, applied in output power conversion device, high-efficiency power electronic conversion, electrical components and other directions, can solve the problems of large output fluctuation of PFC, deterioration of current total harmonic distortion, and inability to work stably, Achieve the effect of improving dynamic response, improving total harmonic distortion and accurate output voltage

Active Publication Date: 2021-05-14
INVENTCHIP TECH CO LTD
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AI Technical Summary

Problems solved by technology

[0003] When controlling the PFC converter, it is necessary to detect the output voltage of the PFC output and generate a control signal according to the output voltage. However, the output voltage of the PFC usually contains the second harmonic component. When using the output containing the second harmonic component to generate When controlling the signal, it will make the total harmonic distortion of the current deteriorate when the control device performs calculations, which will cause large fluctuations in the PFC output and cannot work stably

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  • Control signal generation method of power factor correction circuit, control device and power supply
  • Control signal generation method of power factor correction circuit, control device and power supply
  • Control signal generation method of power factor correction circuit, control device and power supply

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Embodiment Construction

[0059] Various exemplary embodiments, features, and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. The same reference numbers in the figures indicate functionally identical or similar elements. While various aspects of the embodiments are shown in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

[0060] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as superior or better than other embodiments.

[0061] In addition, in order to better illustrate the present disclosure, numerous specific details are given in the following specific implementation manners. It will be understood by those skilled in the art that the present disclosure may be practiced without some of the specific details. In some instances, methods, means, componen...

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Abstract

The invention relates to a control signal generation method of a power factor correction circuit, a control device and a power supply. The control signal generation method comprises the steps of: carrying out zero-crossing detection on an AC voltage of an input AC, and detecting an output voltage of the power factor correction circuit when the AC voltage is detected to be zero-crossing, so as to obtain a detection voltage; and when the detection voltage is between a first preset voltage and a second preset voltage, in a time period between the Kth zero crossing and the (K+1) th zero crossing of the AC voltage, utilizing the control device to adjust a duty ratio and output a control signal based on the detection voltage obtained by the Kth zero crossing, so as to control the power factor correction circuit to carry out power factor correction. According to the control signal generation method, the second harmonic can be suppressed, so that the total harmonic distortion is improved, the dynamic response is improved, the PFC output fluctuation is reduced, the PFC works stably, and stable and accurate output voltage is output.

Description

technical field [0001] The present disclosure relates to the technical field of integrated circuits, and in particular to a method for generating a control signal of a power factor correction circuit, a control device and a power supply. Background technique [0002] The application of power electronics technology can greatly increase the power density of electric energy conversion devices and effectively reduce the volume and weight of the devices. With the rapid development of power electronics technology, there are more and more power electronic devices, and almost every power electronic device needs to convert AC power into DC power through rectification technology, in order to reduce the mutual influence of load harmonics on the power grid and other equipment , the input current harmonic content and power density of each electronic device need to meet the current harmonic requirements of AC electrical equipment. Therefore, it is of great significance to study a PFC (po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/42
CPCH02M1/4208Y02B70/10
Inventor 朱丹阳叶忠韩启祥
Owner INVENTCHIP TECH CO LTD
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