Browse Prior Art Database

Multi-Level Common Controls for High Frequency Switching Power Supplies

IP.com Disclosure Number: IPCOM000040997D
Original Publication Date: 1987-May-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Riggio, SR: AUTHOR

Abstract

A technique is described whereby a switching regulator control circuit provides common controls for a multiple output voltage high frequency power supply. This concept eliminates asynch- ronous switching in high frequency multi-bridge switching power supplies.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 98% of the total text.

Page 1 of 1

Multi-Level Common Controls for High Frequency Switching Power Supplies

A technique is described whereby a switching regulator control circuit provides common controls for a multiple output voltage high frequency power supply. This concept eliminates asynch- ronous switching in high frequency multi-bridge switching power supplies.

In prior art, when high frequency switching regulation was requited and only one switching transformer circuit was used, asynchronous switching was not a problem. However, with the advent of two or more high frequency switching circuits, the electrical switching noise of one switching circuit could cause erroneous switching to occur in the others and damage the switch- in devices. Additionally, regulation accuracy was reduced, since the on and off time of the switching devices determined the value and accuracy of the output voltage levels. The technique described herein provides an in-phase method of switching to prevent these problems from occurring.

This in-phase switching scheme, as shown in the figure, utilizes a separate logic drivers 10 as part of each switching network. These drivers are common to the outputs of toggle flip-flop 11. This insures that all switching networks and devices will change state on the input clock edges, since the outputs of flip-flop 11 change station at essentially the same time. Therefore, a synchronous switching environment is created, eliminating any crosstalk from occurring between switching networks...