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Low Tolerance Multiple Output Switched Power Supply

IP.com Disclosure Number: IPCOM000049721D
Original Publication Date: 1982-Jul-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Azzis, D: AUTHOR [+3]

Abstract

This article describes a multiple-output switched power supply of the master-slave type in which regulation in the main power switching stage is controlled by the largest power output and additional regulation of the other power outputs is performed after rectification.

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Low Tolerance Multiple Output Switched Power Supply

This article describes a multiple-output switched power supply of the master- slave type in which regulation in the main power switching stage is controlled by the largest power output and additional regulation of the other power outputs is performed after rectification.

In the figure, a master pulse-width modulator (PWM) drives a power switching stage loaded by transformer T which has two secondary windings. Secondary winding 10 delivers the main power output, i.e., the largest power output, through filter 12. The voltage at node A controls the width of the pulses produced by the master PWM. Secondary winding 14 delivers a secondary power output through regulator 16 and filter 18. Regulator 16 is driven by a slave PWM. The pulses produced by the slave PWM have their leading edges synchronized with those of the pulses produced by the master PWM and their width controlled by the voltage at node B. The slave pulses must be shorter than the master pulses to provide regulation.

The regulation principle illustrated in the figure can be extended to several secondary power outputs by driving each secondary power output by a slave PWM.

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