Single high voltage supply for use in a multiple developer elect

Details Single high voltage supply for use in a multiple developer elect Single high voltage supply for use in a multiple developer elect

Filed on

1994-12-05

Date issued

1997-05-06

Examiner

Fleming, Fritz

Patent Class

Electricity: electrical systems and devices

SubClass

Control circuits for electromagnetic devices

SubSubClass

For relays or solenoids

Other Related Categories

361191, 307 39, 399228, G03G 1501

Type

Patent

Status

active

Patent number

056277229

Description

ABSTRACT:
In order to accomplish the present invention, there is provided a voltage supply system for use in a color electrophotographic printer where the electrophotographic printer has more than one developer. A high voltage AC source receives a select signal that indicates which one of the developers is presently in use. Provided one and only one developer is in use, the alternating current source outputs an AC voltage. A switching network is connected to the HVAC current source and also each developers. The switching network also receives the select signal and routes the AC voltage to the active developer. Stress to the switching elements in the switching network is reduce by proper sequencing of the application and removal of the HVAC and network reconfigurations.

REFERENCES:
patent: 2424243 (1947-07-01), Powell
patent: 3176197 (1965-03-01), Hoppe
patent: 3709594 (1973-01-01), Hastwell
patent: 4769555 (1988-09-01), Pequet et al.
patent: 4777379 (1988-10-01), Young
patent: 5121172 (1992-06-01), Stover
patent: 5376998 (1994-12-01), Suzuki
patent: 5384490 (1995-01-01), Swartz, Jr.
patent: 5424903 (1995-06-01), Schreiber

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