Power supply apparatus and image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorsHiroki Asano, Yasuhiro Shimura
Life of this patent
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Abstract
The power supply apparatus includes a transformer, a switching unit provided on a primary side of the transformer and configured to perform switching operation for converting an input voltage resulting from rectification and smoothing of an AC voltage and outputting an output voltage from a secondary side of the transformer; a first detection unit configured to detect the output voltage, a feedback unit configured to generate a feedback voltage based on the voltage detected by the first detection unit; a control unit configured to control the switching operation of the switching unit based on the feedback voltage generated by the feedback unit; and a second detection unit configured to detect the AC voltage.
Claims13
A power supply apparatus comprising:
- a transformer configured to isolate a primary side and a secondary side;
- a switching unit provided on the primary side of the transformer and configured to perform switching operation for converting an input voltage in which an AC voltage are rectified and smoothed and outputting an output voltage from the secondary side of the transformer;
- a first detection unit configured to detect the output voltage;
- a feedback unit configured to generate a feedback voltage based on the output voltage detected by the first detection unit;
- a control unit configured to control the switching operation of the switching unit based on the feedback voltage generated by the feedback unit;
- and
- a second detection unit configured to detect the AC voltage,
- wherein the control unit performs the switching operation such that the higher the AC voltage detected by the second detection unit, the shorter a conduction time period of the switching unit corresponding to the feedback voltage and the smaller a variation amount of the conduction time period of the switching unit corresponding to a variation amount of the feedback voltage.
An image forming apparatus comprising:
- an image forming unit for forming an image;
- and
- a power supply apparatus configured to power the image forming apparatus,
- wherein the power supply apparatus comprises:
- a transformer configured to isolate a primary side and a secondary side;
- a switching unit provided on the primary side of the transformer and configured to perform switching operation for converting an input voltage in which an AC voltage are rectified and smoothed and outputting an output voltage from the secondary side of the transformer;
- a first detection unit configured to detect the output voltage;
- a feedback unit configured to generate a feedback voltage based on the output voltage detected by the first detection unit;
- a control unit configured to control the switching operation of the switching unit based on the feedback voltage generated by the feedback unit;
- and
- a second detection unit configured to detect the AC voltage,
- wherein the control unit performs the switching operation such that the higher the AC voltage detected by the second detection unit, the shorter a conduction time period of the switching unit corresponding to the feedback voltage and the smaller a variation amount of the conduction time period of the switching unit corresponding to a variation amount of the feedback voltage.
Dependencies are inferred from the claim text.