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

A technology of power factor correction and control device, which is applied in the control signal generation field of control device and power supply and power factor correction circuit, can solve the problems of unstable operation, deterioration of current total harmonic distortion, large fluctuation of PFC output, etc. Improve dynamic response, improve total harmonic distortion, suppress the effect of second harmonic

Active Publication Date: 2022-07-05
INVENTCHIP TECH CO LTD
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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, control device and power supply of power factor correction circuit
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  • Control signal generation method, control device and power supply of power factor correction circuit

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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 denote elements with the same or similar function. While various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise 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 preferred or advantageous over other embodiments.

[0061] In addition, in order to better illustrate the present disclosure, numerous specific details are given in the following detailed description. It will be understood by those skilled in the art that the present disclosure may be practiced without certain specific details. In some instances, methods, means, components and cir...

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Abstract

The present disclosure relates to a control signal generating method, a control device and a power supply for a power factor correction circuit. The method includes: performing zero-crossing detection on the AC voltage of the input AC power, and when detecting the zero-crossing of the AC voltage, The output voltage of the power factor correction circuit is detected to obtain a detection voltage; when the detection voltage is between the first preset voltage and the second preset voltage, the Kth zero-crossing and Kth zero-crossing of the AC voltage During the time period between +1 zero-crossings, the control device adjusts the duty cycle based on the detected voltage obtained from the Kth zero-crossing and outputs a control signal to control the power factor correction circuit to perform power factor correction. Through the above method, the embodiment of the present disclosure can suppress the second harmonic, so as to improve the total harmonic distortion, improve the dynamic response, and reduce the output fluctuation of the PFC, so that the PFC can work stably and output a stable and accurate output voltage.

Description

technical field [0001] The present disclosure relates to the technical field of integrated circuits, and in particular, to a control signal generating method, a control device and a power supply of a power factor correction circuit. Background technique [0002] The application of power electronic technology can greatly improve the power density of the electric energy conversion device, and effectively reduce the volume and weight of the device. With the rapid development of power electronic technology, there are more and more power electronic devices, and almost every power electronic device needs to convert alternating current into direct current through rectification and conversion 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 sign...

Claims

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Application Information

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Patent Type & Authority Patents(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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