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US 2019/0165565 A1Published application
Power supply apparatus and image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorShota Suzuki
Life of this patent
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Abstract
The power supply apparatus has a configuration in which a temperature detection element and a voltage division resistance element are connected in series as a voltage division unit for an output voltage from a secondary side of a transformer of the power supply apparatus, and stops output of the power supply apparatus based on an output from the voltage division unit.
Claims13
A power supply apparatus comprising:
- a transformer having a primary winding and a secondary winding;
- a switching element connected in series to the primary winding of the transformer;
- a control unit configured to control an output voltage induced in the secondary winding of the transformer by driving the switching element;
- and
- a detection unit configured to detect an overheat state of the transformer,
- wherein the detection unit has a voltage division unit configured to divide the output voltage,
- wherein the voltage division unit includes a temperature detection element whose resistance value decreases according to rising of a temperature, and a voltage division resistance element connected in series to the temperature detection element, the voltage division unit installed in a vicinity of the transformer,
- wherein the detection unit outputs an overheat detection signal to the control unit in a case where the detection unit detects the overheat state of the transformer based on a voltage obtained by dividing the output voltage by the voltage division unit, and
- the control unit turns off the switching element in response to the overheat detection signal output from the detection unit, and stops generation of the output voltage.
6 more elements
An image forming apparatus comprising:
- an image forming unit configured to perform image formation onto a recording material;
- and
- a power supply apparatus configured to supply power to the image forming apparatus,
- wherein the power supply apparatus includes:
- a transformer having a primary winding and a secondary winding;
- a switching element connected in series to the primary winding of the transformer;
- a control unit configured to control an output voltage induced in the secondary winding of the transformer by driving the switching element;
- and
- a detection unit configured to detect an overheat state of the transformer,
- wherein the detection unit has a voltage division unit configured to divide the output voltage,
- wherein the voltage division unit includes a temperature detection element whose resistance value decreases according to rising of a temperature, and a voltage division resistance element connected in series to the temperature detection element, the voltage division unit installed in a vicinity of the transformer,
- wherein the detection unit outputs an overheat detection signal to the control unit in a case where the detection unit detects the overheat state of the transformer based on a voltage obtained by dividing the output voltage by the voltage division unit, and
- the control unit turns off the switching element in response to the overheat detection signal output from the detection unit, and stops generation of the output voltage.
10 more elements
Dependencies are inferred from the claim text.