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Power Supplies for Electronic Equipment

IP.com Disclosure Number: IPCOM000062877D
Original Publication Date: 1985-Jan-01
Included in the Prior Art Database: 2005-Feb-18

Publishing Venue

IBM

Related People

Authors:
King, MM Sawdon, D [+details]

Abstract

This article describes an electrical plug which is adapted to automatically select the correct voltage of an electronic assembly when it has a detachable power cord. Electronic equipment which is designed for world-wide use often has to have a power supply suitable for operation from either 110 or 220 mains supplies. The conventional approach to this problem can take one of three ways: a) voltage selection switch, b) different part numbers for different voltages, and c) wide mark/space ratio (only for simple single output switch mode supplies). These have the disadvantages in that (a) involves risk of damage caused by wrong selection, (b) involves extra cost in manufacturing and shipping multiple parts, and (c) is not generally useful for all equipment.