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Over-Voltage and Under-Voltage Testing on Complex Power Supplies

IP.com Disclosure Number: IPCOM000114863D
Original Publication Date: 1995-Feb-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 71K

Publishing Venue

IBM

Related People

Ahonen, M: AUTHOR [+4]

Abstract

Described is an improved method of testing complex power supplies. Over-voltage and Under-voltage testing of complex power supplies with voltage monitoring is improved by using a parallel supply on auxiliary outputs and providing a circuit to turn off the regulator but leave the monitoring on.

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Over-Voltage and Under-Voltage Testing on Complex Power Supplies

      Described is an improved method of testing complex power
supplies.  Over-voltage and Under-voltage testing of complex power
supplies with voltage monitoring is improved by using a parallel
supply on auxiliary outputs and providing a circuit to turn off the
regulator but leave the monitoring on.

      A complex power supply has more than 1 output, and each output
is generated from the windings on a common transformer core.  A
monitor circuit checks that each output voltage is within the
specification.

      In this configuration, one output, called the master, has
feedback and does the regulation.  The other outputs, called
slave(s), follow along.  If the voltage on the master decreases, the
regulator will increase the voltage on all outputs, and if the
voltage on the master increases the regulator will decrease the
voltage on all outputs.

      Checking for over-voltage on the slave output presents no
problem.  The voltage on the slave output is raised via a separate
over-voltage supply so that an over-voltage occurs.  As shown in the
Figure, no relays are energized, and the over-voltage supply L2 is
connected to the slave output.

      However, checking for over-voltage on the master output causes
the slave outputs to decrease and go into under-voltage.  As the
over-voltage increases the master voltage increases, current in the
master output transformer (not shown) will decrease.  The slave will
go into under-voltage.  As shown in the Figure, no relays are
energized, and the over-voltage supply L1 is connected to the master
output.  The master output cannot be checked using this means.

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