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Flyback Switching Power Supplies With Individual Output Regulation

IP.com Disclosure Number: IPCOM000067306D
Original Publication Date: 1979-Jul-01
Included in the Prior Art Database: 2005-Feb-20

Publishing Venue

IBM

Related People

Authors:
Contino, JS Felton, BC Gillett, JB Knickmeyer, KH Tuchman, WL [+details]

Abstract

In many applications, it is economical to use multiple output switching power supplies. Fig. 1 shows one common transformer-coupled configuration of these supplies which uses a switching transistor Q1 in series with the transformer T1 primary P, and has multiple secondaries S connected to loads poled for flyback operation through respective rectifiers D of the circuits. Operation of Q1 can be pulse-width modulated. However, the overall regulation of the several outputs cannot be independently controlled by the single transistor Q1. Hence, they tend to have relatively wide regulation tolerance.