Browse Prior Art Database

Programmable Power Supply

IP.com Disclosure Number: IPCOM000120419D
Original Publication Date: 1991-Apr-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

St Pierre, R: AUTHOR

Abstract

Disclosed is a procedure to modify a power supply for a personal computer to allow it to be programmed from a standard parallel printer port. The modification provides voltage stressing to the device being powered by the power supply, to bring on intermittent or difficult to isolate failures.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Programmable Power Supply

      Disclosed is a procedure to modify a power supply for a
personal computer to allow it to be programmed from a standard
parallel printer port.  The modification provides voltage stressing
to the device being powered by the power supply, to bring on
intermittent or difficult to isolate failures.

      Controlling the internal voltage reference to the power supply
through a digital-to-analog converter (DAC) enables the power supply
to be programmed by sending data to a printer port.  The output
voltage of the power supply is now modulated according to this data.

      The interface is controlled by a Terminate and Stay Resident
(TSR) software program.  The TSR control program can be run in the
background so the controlling computer system is free to run test
programs.

      As shown in the figure, the device under test is powered by a
programmable power supply 1.  Power supply 1 is controlled through a
parallel cable attached to a printer port of the computer.  The data
sent by the controlling program is fed to the DAC.  The analog output
of the DAC is compared with the sensed output voltage and used to
correct the output of the power supply.