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COMMON CORONODE SUPPLY FOR MULTIPLE DICOROTRONS

IP.com Disclosure Number: IPCOM000024614D
Original Publication Date: 1981-Apr-30
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 67K

Publishing Venue

Xerox Disclosure Journal

Abstract

In a xerographic copier employing dicorotrons, the power supply system can be simplified by combining coronode wire power requirements into a single power supply output. The power supply module for a dicorotron coronode wire consists of a controlled output level oscillator, constant current feedback control (including a corona current discriminator) and a high-voltage/high-frequency output trans-former. A single module may be used for several dicorotrons if the current feed back signals are summed and the same output voltage is applied to all the coronodes. Other options include (1) sensing the current for one coronode and slaving the other coronodes and (2) providing taps on the output transformer to allow different nominal operating levels for different dicorotrons.

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IXEROX DISCLOSURE JOURNAL

COMMON CORONODE SUPPLY FOR MULTIPLE DICOROTRONS U.S. C1. 430/35
Thomas F. Hayne

Proposed Classification

Int. Cl. G03g 17/04

In a xerographic copier employing dicorotrons, the power supply system can be simplified by combining coronode wire power requirements into a single power supply output. The power supply module for a dicorotron coronode wire consists of a controlled output level oscillator, constant current feedback control (including a corona current discriminator) and a high-voltage/high-frequency output trans- former. A single module may be used for several dicorotrons if the current feed back signals are summed and the same output voltage is applied to all the coronodes. Other options include (1) sensing the current for one coronode and slaving the other coronodes and (2) providing taps on the output transformer to allow different nominal operating levels for different dicorotrons.

The present proposal allows one or more modules to be eliminated while only requiring a higher power level for the oscillator/transformer combination in the single module. The savings in volume, cost, efficiency and reliability can be significant (i.e., fifty percent up to several hundred percent). The design can be implemented because the prime function of the coronode in a dicorotron is to provide sufficient AC corona current. Thus, the tolerance on individual coronode outputs can be rather broad as long as a minimum output level is maintained. The...