Browse Prior Art Database

Method for Protecting Power Supply Load From Large Overvoltages

IP.com Disclosure Number: IPCOM000100325D
Original Publication Date: 1990-Apr-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 1 page(s) / 28K

Publishing Venue

IBM

Related People

Willis, SC: AUTHOR

Abstract

Disclosed is a method for protecting a load from large overvoltages during buffer amplifier failure of a non-isolated buck converter power supply.

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Method for Protecting Power Supply Load From Large Overvoltages

       Disclosed is a method for protecting a load from large
overvoltages during buffer amplifier failure of a non-isolated buck
converter power supply.

      The drawing shows a non-isolated buck converter that would be
used in a distributed power architecture.  This converter includes
diode CR1 which is a feature of this disclosure.  Example voltages
are shown for illustrative purposes.

      Without diode CR1, if a buffer amplifier component failed,
sense lines opened, or power to the buffer interrupted, Vfb would
fall towards zero, causing Vout to go to Vin, with probable damage to
the load.  With diode CR1, Vout is limited to approximately one diode
drop above Vref, thereby reducing the risk of damage caused by an
overvoltage condition.

      The polarity of CR1 is selected for the case Vout < Vref, such
that the diode is normally not conducting.