Three-value power supply device and image forming apparatus util

Details Three-value power supply device and image forming apparatus util Three-value power supply device and image forming apparatus util

1993-07-27

1996-10-22

Wysocki, Jonathan

Electrical transmission or interconnection systems

Switching systems

Condition responsive

363 21, 363 71, 378111, H02M 300

Patent

active

055679978

ABSTRACT:
Disclosed is a three-value power supply device, adapted for supplying developing bias voltages to a copying machine. The device comprises a positive high voltage source, a negative high voltage source, first and second high voltage transistors serially connected between the positive and negative high voltage sources, with an output terminal connected to the junction point between two transistors, and a timing controller for selectively turning on and off the two transistors.

REFERENCES:
patent: 4747012 (1988-05-01), Maebra et al.
patent: 4868729 (1989-09-01), Suzuki et al.
patent: 5173847 (1992-12-01), Suzuki
patent: 5229818 (1993-07-01), Nakahara et al.

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