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Diode Detector

IP.com Disclosure Number: IPCOM000107823D
Original Publication Date: 1992-Mar-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 1 page(s) / 31K

Publishing Venue

IBM

Related People

Copeman, C: AUTHOR

Abstract

This invention is a circuit that detects the presence and orientation of diode in parallel with an inductor. After a circuit board is manufactured the components are individually tested with an in-circuit tester. The test is designed to detect the value and orientation of the components. The idea is that if all the right parts are on the board and they are in the right way the board should work properly. (Image Omitted)

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Diode Detector

       This invention is a circuit that detects the presence and
orientation of diode in parallel with an inductor.  After a circuit
board is manufactured the components are individually tested with an
in-circuit tester.  The test is designed to detect the value and
orientation of the components.  The idea is that if all the right
parts are on the board and they are in the right way the board should
work properly.

                            (Image Omitted)

      It has previously not been possible to in-circuit test for the
diodes that are in parallel with an inductor.  The diode tests
involve a DC voltage and current measurement and the parallel
inductor acts as a short circuit for DC.  The following circuit can
overcome these problems stimulating the circuit with an AC waveform
and measuring the response. The asymmetry of the diode causes an
asymmetric response even though the DC level is 0.  The test circuit
uses this to produce a different voltage output depending on the
presence and orientation of the diode.