Browse Prior Art Database

Multi-Voltage Power Supply/Interface Polarizing Key

IP.com Disclosure Number: IPCOM000111134D
Original Publication Date: 1994-Feb-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Veals, ER: AUTHOR

Abstract

Disclosed is a device (key) that allows various output voltage Power Supplies (PS) to plug into multi-voltage units, mate with the same interfaces, and assure that the voltages are compatible.

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Multi-Voltage Power Supply/Interface Polarizing Key

      Disclosed is a device (key) that allows various output voltage
Power Supplies (PS) to plug into multi-voltage units, mate with the
same interfaces, and assure that the voltages are compatible.

      Only proper voltage PS and unit interfaces can plug together
without severe damage to one or both devices.  This key assures unit
compatibility PRIOR to any electrical contact being made, thus
preventing incompatible PS/unit interface voltages being interchanged
during either initial manufacturing/test or any subsequent field
replacement of the PS.

      This "snap-in" plastic key is installed in the rear of the PS
at the time of manufacture.  Once installed (without tools), the
orientation of the key cannot be changed from outside the PS chassis.

      For a given voltage, the key is oriented in the lower position.
This matches a unique hole in the unit interface for that voltage.
For a different voltage, the key is oriented in the upper position.
This matches a unique hole in the unit interface for that voltage.
Many combinations are obtainable by configuring the key/unit
interface for the required number of different voltages.

      This key is also designed to "display" the proper voltage of
the PS.  All of the voltages are marked on the PS chassis.  The key
blocks ALL but the proper voltage designation when installed
(Figure).