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US 10,432,084 B2Granted
Power supply apparatus and image forming apparatus controlling switching elements based on detection of a malfunction
AssigneeCanon Kabushiki Kaisha
InventorsYusuke Saito, Hiroki Asano, Yasuhiro Shimura
Life of this patent
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Abstract
The switching power supply apparatus including a transformer includes a detection unit configured to detect that the power supply apparatus malfunctions and a first holding unit configured to turn off a first switching element and holds the first switching element at turn-off condition, and when the detection unit detects that malfunction occurs, the first holding unit releases the first switching element from the turn-off condition at a timing when the control unit turns on the second switching element by a second control signal.
Claims17
A power supply apparatus comprising:
- a transformer including a primary winding and a secondary winding;
- a first switching element connected in series to the primary winding of the transformer;
- a second switching element connected in parallel to the primary winding of the transformer;
- a capacitor connected in series to the second switching element and connected in parallel along with the second switching element to the primary winding of the transformer;
- a feedback unit configured to output information according to voltage induced in the secondary winding of the transformer;
- a control unit configured to control turn-on or turn-off of the first switching element by a first control signal and control turn-on or turn-off of the second switching element by a second control signal based on the information output from the feedback unit, the control unit configured to perform a switching operation of alternate turn-on and turn-off of the first switching element and the second switching element before and after a dead time in which the first switching element and the second switching element are both turned off;
- a detection unit configured to detect that the power supply apparatus malfunctions;
- and
- a first holding unit configured to turn off the first switching element and holds the first switching element at a turn-off condition,
- wherein in a case where the detection unit detects that malfunction occurs, the first holding unit releases the first switching element from the turn-off condition at a timing when the control unit turns on the second switching element by the second control signal.
7 more elements
An image forming apparatus comprising:
- an image forming unit configured to form an image on a recording material;
- and
- a power supply apparatus to supply power to the image forming apparatus, the power supply apparatus including;
- a transformer including a primary winding and a secondary winding;
- a first switching element connected in series to the primary winding of the transformer;
- a second switching element connected in parallel to the primary winding of the transformer;
- a capacitor connected in series to the second switching element and connected in parallel along with the second switching element to the primary winding of the transformer;
- a feedback unit configured to output information according to voltage induced in the secondary winding of the transformer;
- a control unit configured to control turn-on or turn-off of the first switching element by a first control signal and control turn-on or turn-off of the second switching element by a second control signal based on the information output from the feedback unit, the control unit configured to perform a switching operation of alternate turn-on and turn-off of the first switching element and the second switching element before and after a dead time in which the first switching element and the second switching element are both turned off;
- a detection unit configured to detect that the power supply apparatus malfunctions;
- and
- a first holding unit configured to turn off the first switching element and holds the first switching element at a turn-off condition,
- wherein in a case where the detection unit detects that malfunction occurs, the first holding unit releases the first switching element from the turn-off condition at a timing when the control unit turns on the second switching element by the second control signal.
10 more elements
Dependencies are inferred from the claim text.