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HIGH VOLTAGE EMITTER FOLLOWER CURRENT CONTROL OF PIN OR CONVENTIONAL COROTRONS

IP.com Disclosure Number: IPCOM000025142D
Original Publication Date: 1983-Oct-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 68K

Publishing Venue

Xerox Disclosure Journal

Abstract

This disclosure relates to a control for pins or conventional corotrons. Heretofore, a voltage multiplier network was provided for sharing a high voltage power supply between multiple discharge devices such as pins or conventional corotrons. The control disclosed herein utilizes an operational amplifier and a high voltage transistor together with a voltage quadrupler network to directly control DC current delivered to a photoconductive surface.

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XEROX DISCLOSURE JOURNAL

HIGH VOLTAGE EMITTER FOLLOWER CURRENT CONTROL OF PIN OR CONVENTIONAL COROTRONS Morton Silverberg

Proposed Classification
U.S. Cl. 355/3R Int. Cl. G03g 15/00

This disclosure relates to a control for pins or conventional corotrons. Heretofore, a voltage multiplier network was provided for sharing a high voltage power supply between multiple discharge devices such as pins or conventional corotrons. The control disclosed herein utilizes an operational amplifier and a high voltage transistor together with a voltage quadrupler network to directly control DC current delivered to a photoconductive surface.

As disclosed in the figure, a control generally indicated by reference character 10 serves to provide a suitable DC current to a coronode (i.e., pin or corona wire) 12 which together with a conductive shield 14 constitutes a corona discharge device of the type usually employed for subjecting a photoconductive surface to corona emissions.

The control 10 rectifies the AC current provided at the output of the secondary winding 16 of a transformer 17. The input current for the coronode is derived from a transistor 18. The use of a quadrupler network 20 causes the maximum voltage across the transistor to result in twice the delta at the coronode thereby enabling the use of a transistor with lower voltage specifications. The auadrupler network also reduces the voltage of the transformer 17.

Volume 8 Number 5 September/October 1983 425

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