Power supply apparatus and image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorMinoru Hayasaki
Life of this patent
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Abstract
The power supply apparatus includes a transformer, a switch element that drives a primary side of the transformer, and a control unit that controls a drive frequency of the switch element, wherein when a state of driving the switch element at a first drive frequency is shifted to a state of driving the switch element at a second drive frequency lower than the first drive frequency, the control unit turns on the switch element at a first timing in which a displacement amount of the transformer caused by the drive of the transformer becomes a first displacement amount and at a second timing in which the displacement of the transformer becomes a second displacement amount smaller than the first displacement amount.
Claims17
A power supply apparatus, comprising:
- a transformer in which a primary side and a secondary side are insulated;
- a switch element that drives the primary side of the transformer;
- and
- a control unit that controls a drive frequency of the switch element,
- wherein in a case where a state in which the switch element is driven at a first drive frequency is shifted to a state in which the switch element is driven at a second drive frequency lower than the first drive frequency, the control unit turns on the switch element at a timing according to a drive period of the transformer.
An image forming apparatus comprising:
- an image forming unit that forms an image on a recording material;
- and
- a power supply that supplies electric power to the image forming apparatus
- wherein the power supply comprises:
- a transformer in which a primary side and a secondary side are insulated;
- a switch element that drives the primary side of the transformer;
- and
- a control unit that controls a drive frequency of the switch element,
- wherein in a case where a state in which the switch element is driven at a first drive frequency is shifted to a state in which the switch element is driven at a second drive frequency lower than the first drive frequency, the control unit turns on the switch element at a timing according to a drive period of the transformer.
A power supply apparatus comprising:
- a transformer in which a primary side and a secondary side are insulated;
- a switch element that drives the primary side of the transformer;
- and
- a control unit that controls an driving operation of the switch element,
- wherein the driving operation includes a turn-on of the switch element according to a displacement amount of the transformer.
An image forming apparatus comprising:
- an image forming unit that forms an image on a recording material;
- and
- a power supply apparatus that supplies electric power to the image forming apparatus,
- wherein the power supply apparatus comprises:
- a transformer in which a primary side and a secondary side are insulated;
- a switch element that drives the primary side of the transformer;
- and
- a control unit that controls an driving operation of the switch element,
- wherein the driving operation includes a turn-on of the switch element according to a displacement amount of the transformer.
Dependencies are inferred from the claim text.