A primary-side-control quasi-resonant flyback converter with tight output voltage regulation and self-calibrated valley switching

Ping-Chun Hsieh, Chia Jung Chang, Chern Lin Chen

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

25 Scopus citations

Abstract

This paper presents methods and circuits to achieve tight output voltage regulation and self-calibrated valley switching for primary-side-control quasi-resonant (QR) flyback converters. By tracking the slope of auxiliary winding voltage, the controller retrieves the output voltage at a fixed diode current with a simple analog method, and it thus suppresses the load and line effect on the output voltage. The proposed self-calibrated valley switching circuit is based on the perturb and observe (P&O) method to automatically detect the QR valley, and no extra off-chip component is required. A primary-side flyback controller that integrates the two proposed circuits has been designed and simulated using the SPICE model for VIS 0.5-μm 5-V/40-V high-voltage CMOS process. Simulation results of a 6.2-V/5-W QR flyback converter exhibit a 0.8% output voltage variation with the load varying from 10% to full and the input voltage from 127 V to 375 V, and the validity of the proposed valley switching technique is also verified.

Original languageEnglish
Title of host publication2013 IEEE Energy Conversion Congress and Exposition, ECCE 2013
Pages3406-3412
Number of pages7
DOIs
StatePublished - 31 Dec 2013
Event5th Annual IEEE Energy Conversion Congress and Exhibition, ECCE 2013 - Denver, CO, United States
Duration: 15 Sep 201319 Sep 2013

Publication series

Name2013 IEEE Energy Conversion Congress and Exposition, ECCE 2013

Conference

Conference5th Annual IEEE Energy Conversion Congress and Exhibition, ECCE 2013
CountryUnited States
CityDenver, CO
Period15/09/1319/09/13

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