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US 4,727,463 AGranted
Power supply device comprising means for modulating the output thereof
AssigneeCanon Kabushiki Kaisha
InventorKoji Suzuki
Life of this patent
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Abstract
There is disclosed a power supply device capable of providing stable AC and DC output voltages. For this purpose an input voltage is chopped by a controlled switching device and supplied to a converter transformer to obtain a high output voltage at the secondary side, and the output voltage is separated in two portions for supply to two loads.
Claims21
A power supply device comprising:
- a transformer for generating a high voltage at the secondary side thereof in accordance with a voltage supplied to the primary side thereof;
- switching means for switching the voltage supplied to the primary side of said transformer;
- rectifier means for rectifying the output of the secondary side of said transformer;
- modulation means for modulating the primary side of said transformer as a function of a characteristic of the rectified output of said rectifier means with a predetermined modulating frequency;
- first feed means for feeding the output modulated by said modulation means to a first load;
- and
- second feed means for extracting a modulated component from said modulated output and feeding said modulated component to a second load.
4 more elements
An image forming apparatus comprising:
- latent image forming means comprising charging means for forming an electrostatic latent image on a recording member;
- developing means for developing the electrostatic latent image formed on said recording member;
- first output means for supplying said charging means with a voltage having a modulated component and a D.C. constant component;
- and
- second output means for separating the modulated component from said constant D.C. component from the output of said first output means in such a manner that said modulated component becomes an AC component outputted to said developing means.
2 more elements
Dependencies are inferred from the claim text.