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Battery Back-up Power Transformer for Multiple Input Voltages

IP.com Disclosure Number: IPCOM000109928D
Original Publication Date: 1992-Sep-01
Included in the Prior Art Database: 2005-Mar-24
Document File: 1 page(s) / 38K

Publishing Venue

IBM

Related People

Patterson, BE: AUTHOR

Abstract

Described is a hardware implementation that provides a battery back-up transformer for multiple input voltages. The concept is designed to eliminate the input battery voltage selection limitation in that it provides two or more voltage criteria. (Image Omitted)

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This is the abbreviated version, containing approximately 100% of the total text.

Battery Back-up Power Transformer for Multiple Input Voltages

      Described is a hardware implementation that provides a battery
back-up transformer for multiple input voltages.  The concept is
designed to eliminate the input battery voltage selection limitation
in that it provides two or more voltage criteria.

                            (Image Omitted)

      In prior art, battery back-up devices had the main power supply
transformer equipped with an additional winding for powering by
battery voltage.  This additional winding was typically driven with a
push-pull circuit when the input AC voltage is not present.  However,
this design limited the push-pull winding design operation to only
one input DC voltage level.

      The concept described herein provides a transformer design that
has the capability to operate from either of two voltages.  The
figure shows the transformer winding design for a two voltage output
level.  It is designed to operate from either V1, winding W1, or V2,
winding W2, when the input voltage is present.  The transformer turns
ratio of windings W1 and W2 as well as the core are designed for
operation at either input DC voltage V1 or V2.  This allows greater
flexibility in the selection of a battery for the back-up operation.

      Disclosed anonymously.