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Fly-back converter control method based on primary side feedback and control circuit thereof

A technology of flyback converter and primary side feedback, which is applied in the direction of control/regulation system, output power conversion device, DC power input conversion to DC power output, etc., which can solve the problem of difficult to achieve high power factor and low harmonic component And other issues

Active Publication Date: 2016-02-03
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the object of the present invention is to provide a control method and control circuit of a flyback converter based on primary side feedback, in order to solve the technical problems existing in the prior art that it is difficult to achieve high power factor and low harmonic components

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  • Fly-back converter control method based on primary side feedback and control circuit thereof
  • Fly-back converter control method based on primary side feedback and control circuit thereof
  • Fly-back converter control method based on primary side feedback and control circuit thereof

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Embodiment Construction

[0033] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any alternatives, modifications, equivalent methods and schemes made within the spirit and scope of the present invention.

[0034] In order to provide the public with a thorough understanding of the present invention, specific details are set forth in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details.

[0035] In the following paragraphs the invention is described more specifically by way of example with reference to the accompanying drawings. It should be noted that all the drawings are in simplified form and use inaccurate scales, which are only used to facilitate and clearly assist the purpose of illustrating the embodiments of t...

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Abstract

The invention discloses a fly-back converter control method based on primary side feedback and a control circuit thereof. The fly-back converter control method based on primary side feedback comprises the steps of sampling input voltage of the fly-back converter in a plurality of switching periods for obtaining an input voltage sampling signal which represents an input voltage; comparing the input voltage sampling signal with a reference voltage, and obtaining a first comparing signal which is used for representing time when input voltage approaches zero, wherein the reference voltage is a positive voltage which approaches zero; delaying the first comparing signal by one-quarter power frequency period according to the first comparing signal and a power frequency period, and obtaining a delayed signal which is used for representing input voltage peak value time; utilizing one switching period after the input voltage peak value time as a reference switching period, and limiting a switching frequency in the power frequency period of the fly-back converter according to the reference switching period. The fly-back converter control method based on primary side feedback and the control circuit thereof can realize high power factor and low current harmonic component.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a control method and a control circuit of a flyback converter based on primary side feedback. Background technique [0002] The prior art flyback converter based on primary side feedback includes a rectifier circuit and a transformer. The transformer is composed of a primary side inductance and a secondary side inductance. The primary side inductance is connected in series with the primary side MOS tube. flow diode connection. The primary side MOS tube is connected with a primary side feedback control circuit for on-off status of the primary side MOS tube. [0003] In the above-mentioned prior art, the general method to achieve high power factor is to adopt the control method of fixed on-time, that is, to adopt the slow loop control, so that the output voltage of the loop remains almost constant throughout the power frequency cycle, and the primary side MOS The judgme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
Inventor 陈惠强
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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