Power supply unit capable of high frequency switching for poweri

Details Power supply unit capable of high frequency switching for poweri Power supply unit capable of high frequency switching for poweri

1996-12-18

1999-09-14

Sterrett, Jeffrey

Electric power conversion systems

Current conversion

Having plural converters for single conversion

363 37, 363 65, H02M 5458

Patent

active

059532238

ABSTRACT:
This invention is related to a power supply unit used in an image forming apparatus having a induction heat fusing device. In the power supply unit, each of a first and a second rectifying circuits rectifies AC voltage from a power supply to generate DC voltage. An inverter circuit generates a high frequency voltage to be applied to a coil of the induction heat fusing device by switching the DC voltage from the first rectifying circuit. A switching circuit switches the DC voltage from said second rectifying circuit and generates AC voltage. A transformer receives the AC voltage from the switching circuit and outputs a transformed voltage to be apply to a component of the image forming apparatus. The inverter, second rectifying circuit and switching circuit are connected to a common ground line.

REFERENCES:
patent: 3234450 (1966-02-01), Jennings
patent: 3390320 (1968-06-01), Kammiller et al.
patent: 3491250 (1970-01-01), Shoh
patent: 4027169 (1977-05-01), Lowther
patent: 4323960 (1982-04-01), Jones
patent: 4330818 (1982-05-01), Peschel
patent: 4791528 (1988-12-01), Suzuki et al.
patent: 4916599 (1990-04-01), Traxler et al.
patent: 5353215 (1994-10-01), Dinwiddlie et al.
patent: 5532917 (1996-07-01), Hung

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