Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Control Method and Control Circuit of Flyback Converter Based on Primary Side Feedback

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: 2018-01-02
SILERGY SEMICON TECH (HANGZHOU) CO LTD
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

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
  • Control Method and Control Circuit of Flyback Converter Based on Primary Side Feedback
  • Control Method and Control Circuit of Flyback Converter Based on Primary Side Feedback
  • Control Method and Control Circuit of Flyback Converter Based on Primary Side Feedback

Examples

Experimental program
Comparison scheme
Effect test

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...

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 discloses a control method and a control circuit of a flyback converter based on primary side feedback, which samples the input voltage of multiple switching cycles of the flyback converter to obtain an input voltage sampling signal representing the input voltage; the described The input voltage sampling signal is compared with the reference voltage to obtain a first comparison signal, and the first comparison signal is used to represent the moment when the input voltage approaches zero; the reference voltage is a positive voltage approaching zero; according to The first comparison signal and the power frequency cycle, the first comparison signal is delayed by a quarter of the power frequency cycle to obtain a delay signal used to represent the peak moment of the input voltage; a switching cycle after the peak moment of the input voltage is used as The reference switching period defines the switching frequency in the power frequency period of the flyback converter according to the reference switching period. The invention 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

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
Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335
Inventor 陈惠强
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com