Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

ADJUSTABLE RESISTIVE ELEMENT

IP.com Disclosure Number: IPCOM000026514D
Original Publication Date: 1992-Aug-31
Included in the Prior Art Database: 2004-Apr-06
Document File: 2 page(s) / 92K

Publishing Venue

Xerox Disclosure Journal

Abstract

It is commonly known to utilize fixed value, high voltage resistors as "dummy" loads when testing high-voltage power supplies. While controllable, or adjustable test loads exist for low-voltage power supplies, variable resistance loads are generally unavailable for the testing of high-voltage power supplies.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 67% of the total text.

Page 1 of 2

XEROX DISCLOSURE JOURNAL

ADJUSTABLE RESISTIVE ELEMENT
Michael J. Hill
Clifford Friend

Proposed Classification US. C1.323/353
Int. C1. G05B 24/02

// 14

-

HIGH VOLTAGE D.C.

SUPPLY UNDER TEST

x\ -

L \\ ,

\ CURRENT I MONITOR ADJ.

RESISTANCE

20 J

at

VOLTAGE M ON IT0 R

\

I

CURRENT

XEROX DISCLOSURE JOURNAL - Vol. 17, Yo. 4 July/August 1992 201

[This page contains 1 picture or other non-text object]

Page 2 of 2

ADJUSTABLE RESISTIVE ELEMENT(Cont'd)

It is commonly known to utilize fixed value, high voltage resistors as "dummy" loads when testing high-voltage power supplies. While controllable, or adjustable test loads exist for low-voltage power supplies, variable resistance loads are generally unavailable for the testing of high-voltage power supplies.

Accordingly, the present invention is directed at the use of a light emitting diode/light dependent resistor (LED/LDR) component as a controllable high voltage DC resistive load. The Xerox LED/LDR, Part no. 105810424 is generally used within the high voltage subsystems of xerographic machines to provide voltage or current regulation, and may be used with voltages up to 5.0 KVdc at a power rating of 2.0 watts. By adding input and output control circuitry to the LED/LDR, the current passed through the LED could be controlled, thereby controlling the the DC resistance of the LDR. As illustrated in the accompanying figure, LED/LDR 12 could be attached to the output of a power supply, 14, via connector 16. The additional hardwar...