Power supply device and image forming apparatus including power supply device
AssigneeCanon Kabushiki Kaisha
InventorsJunji Suzuki, Junichi Kubota
Life of this patent
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Abstract
A power supply device includes first and second transformers, a first power source configured to output a first DC voltage from the first transformer, a second power source configured to output a second DC voltage from the second transformer, a first winding on a primary side of the first transformer, an auxiliary winding which is wound in the same winding direction as the first winding, and a voltage generator configured to be connected to the auxiliary winding and to generate a power supply voltage for driving a first controller of the first power source and a second controller of the second power source. When an AC voltage drops, control is performed such that the second controller stops prior to the first controller.
Claims10
A power supply device comprising:
- a first switching power source configured to include a first transformer to which a voltage obtained by rectifying and smoothing an input AC voltage is supplied and to output a first DC voltage by switching the first transformer;
- a first controller configured to control a switching operation of the first switching power source;
- a second switching power source configured to include a second transformer to which a voltage obtained by rectifying and smoothing the AC voltage is input and to output a second DC voltage by switching the second transformer;
- a second controller configured to control a switching operation of the second switching power source;
- a primary winding of the first transformer;
- an auxiliary winding which is wound in the same winding direction as the primary winding;
- and
- a voltage generator configured to be connected to the auxiliary winding and to generate a power supply voltage for driving the first controller and the second controller,
- wherein the voltage generator generates the power supply voltage such that a power supply voltage supplied to the second controller is lower than a power supply voltage supplied to the first controller, and
- wherein when the AC voltage drops, the power supply device performs control such that the second controller stops prior to the first controller.
An image forming apparatus that forms an image on a recording material, the image forming apparatus comprising:
- an image forming unit;
- and
- a power supply device configured to supply electric power to the image forming apparatus,
- wherein the power supply device includes
- a first switching power source configured to include a first transformer to which a voltage obtained by rectifying and smoothing an input AC voltage is supplied and to output a first DC voltage by switching the first transformer,
- a first controller configured to control a switching operation of the first switching power source,
- a second switching power source configured to include a second transformer to which a voltage obtained by rectifying and smoothing the AC voltage is input and to output a second DC voltage by switching the second transformer,
- a second controller configured to control a switching operation of the second switching power source, and
- a primary winding of the first transformer,
- an auxiliary winding which is wound in the same winding direction as the primary winding, and
- a voltage generator configured to be connected to the auxiliary winding and to generate a power supply voltage for driving the first controller and the second controller,
- wherein the voltage generator generates the power supply voltage such that a power supply voltage supplied to the second controller is lower than a power supply voltage supplied to the first controller, and
- wherein when the AC voltage drops, the power supply device performs control such that the second controller stops prior to the first controller.
Dependencies are inferred from the claim text.