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US 4,791,528 AGranted
Power supply device
AssigneeCanon Kabushiki Kaisha
InventorsKoji Suzuki, Shunichi Komatsu
Life of this patent
Estimating the term…
Abstract
There is disclosed an integral power supply device for supplying a high voltage and a low voltage in stable manner. A switched input voltage is supplied to a self-excited transformer having two secondary output voltages. A high voltage output is supplied to a first load and is controlled by a control circuit which receives a low voltage output supplied also to a second load.
Claims15
A power supply device comprising:
- a transformer having a primary winding and a plurality of secondary windings comprising first and second secondary windings;
- switching means connected to said primary winding of said transformer for switching an input to said primary winding to generate an increased voltage output on said plurality of secondary windings of said transformer;
- first output means for applying a high voltage to a predetermined load in accordance with an output of said first secondary winding;
- second output means connected to said second secondary winding for outputting a predetermined low voltage;
- control means adapted to be supplied thereto with said predetermined low voltage from said second output means as an operation source, said control means producing a control signal for switching the high voltage supplied to said predetermined load from a first high voltage to a second high voltage;
- and
- change means responsive to said control signal for changing the electric power supplied to said primary winding.
4 more elements
A power supply device for image forming apparatus comprising:
- a transformer having a primary winding and a plurality of secondary windings including first and second secondary windings;
- switching means connected to said primary winding of said transformer for switching an input to said primary winding to generate an increased output voltage on said plurality of secondary windings of said transformer;
- first output means for outputting a high voltage to a charging means in accordance with an output of said first secondary winding;
- second output means for outputting a high frequency output to an exposure means in accordance with an output of said second secondary winding;
- third output means connected to said second secondary winding for outputting a regulated low voltage to a sequence control means;
- and
- change means responsive to a control signal from said sequence control means for changing the output voltage from said first output means between the time during which the image forming apparatus is in its stand-by state and the time of image formation of the image forming apparatus.
4 more elements
A power supply device comprising:
- a transformer having a primary winding and a plurality of secondary windings including first, second, and third secondary windings;
- switching means connected to said primary winding of said transformer for switching an input to said primary winding to generate an increased output voltage on said plurality of secondary windings of said transformer;
- first output means for applying a high voltage to a pre-determined load in accordance with an output of said first secondary winding;
- second output means for outputting a low voltage from said second secondary winding;
- third output means for outputting a low voltage from said third secondary winding;
- selection means for selecting the output of said second output means or said third output means;
- and
- control means adapted to be supplied with said low voltage from said second or third output means selected by said selection means as an operation source, said control means producing a control signal for controlling the high voltage outputted from said first output means.
5 more elements
Dependencies are inferred from the claim text.