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US 2019/0058387 A1Published application
Power supply apparatus and image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorsYasuhiro Shimura, Hiroki Asano
Life of this patent
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Abstract
The power supply apparatus includes a current detection unit configured to detect a current that flows through a first switching element of a transformer, and a control unit controls a turn-on time of the first switching element based on a feedback voltage from a secondary side of the transformer, controls a turn-on time of a second switching element based on a detection result of the current detection unit, and performs switching between a continuous control and an intermittent control based on the feedback voltage, the continuous control being a control to perform an operation of continuing a first period, the intermittent control being a control to perform an operation of alternately repeating the first period and a second period.
Claims20
A power supply apparatus comprising:
- a transformer including a primary winding and a secondary winding;
- a first switching element connected in series with the primary winding of the transformer;
- a second switching element connected in parallel with the primary winding of the transformer;
- a capacitor connected in series with the second switching element and connected in parallel with the primary winding of the transformer together with the second switching element;
- a feedback unit configured to output a feedback voltage to a primary side according to a voltage induced in the secondary winding of the transformer;
- and
- a control unit configured to control turn-on or turn-off of the first switching element and the second switching element based on the feedback voltage, the control unit configured to perform an operation of alternately repeating a first period in which a switching operation is performed and a second period in which the switching operation is stopped, the switching operation being an operation of alternately turning on or turning off the first switching element and the second switching element before and after a dead time in which both the first switching element and the second switching element are in a turn-off condition;
- and
- a current detection unit configured to detect a current that flows through the first switching element,
- wherein the control unit controls a turn-on time of the first switching element based on the feedback voltage, controls a turn-on time of the second switching element based on a detection result of the current detection unit, and performs switching between a continuous control and an intermittent control based on the feedback voltage, the continuous control being a control to perform an operation of continuing the first period, the intermittent control being a control to perform an operation of alternately repeating the first period and the second period.
7 more elements
A power supply apparatus comprising:
- a transformer including a primary winding on a primary side and a secondary winding on a secondary side;
- a first switching element connected in series with the primary winding of the transformer;
- a second switching element connected in parallel with the primary winding of the transformer;
- a capacitor connected in series with the second switching element and connected in parallel with the primary winding of the transformer together with the second switching element;
- a feedback unit configured to output a feedback voltage to a primary side according to a voltage induced in the secondary winding of the transformer;
- and
- a control unit configured to control turn-on or turn-off of the first switching element and the second switching element based on the feedback voltage, the control unit configured to perform an operation of alternately repeating a first period in which a switching operation is performed and a second period in which the switching operation is stopped, the switching operation being an operation of alternately turning on or turning off the first switching element and the second switching element before and after a dead time in which both the first switching element and the second switching element are in a turn-off condition;
- a current detection unit configured to detect a current that flows through the first switching element;
- and
- a voltage detection unit configured to detect an input voltage supplied to the primary side of the transformer,
- wherein the control unit controls a turn-on time of the first switching element based on the feedback voltage, controls a turn-on time of the second switching element based on detection results of the current detection unit and the voltage detection unit, and performs switching between a continuous control and an intermittent control based on the feedback voltage, the continuous control being a control to perform an operation of continuing the first period, the intermittent control being a control to perform an operation of alternately repeating the first period and the second period.
8 more elements
An image forming apparatus comprising:
- an image forming unit configured to perform image formation on a recording member;
- and
- a power supply apparatus configured to supply electric power to the image forming apparatus,
- the power supply apparatus including:
- a transformer including a primary winding on a primary side and a secondary winding on a secondary side;
- a first switching element connected in series with the primary winding of the transformer;
- a second switching element connected in parallel with the primary winding of the transformer;
- a capacitor connected in series with the second switching element and connected in parallel with the primary winding of the transformer together with the second switching element;
- a feedback unit configured to output a feedback voltage to a primary side according to a voltage induced in the secondary winding of the transformer;
- and
- a control unit configured to control turn-on or turn-off of the first switching element and the second switching element based on the feedback voltage, the control unit configured to perform an operation of alternately repeating a first period in which a switching operation is performed and a second period in which the switching operation is stopped, the switching operation being an operation of alternately turning on or turning off the first switching element and the second switching element before and after a dead time in which both the first switching element and the second switching element are in a turn-off condition,
- a current detection unit configured to detect a current that flows through the first switching element,
- wherein the control unit controls a turn-on time of the first switching element based on the feedback voltage, controls a turn-on time of the second switching element based on a detection result of the current detection unit, and performs switching between a continuous control and an intermittent control based on the feedback voltage, the continuous control being a control to perform an operation of continuing the first period, the intermittent control being a control to perform an operation of alternately repeating the first period and the second period.
10 more elements
An image forming apparatus comprising:
- an image forming unit configured to perform image formation on a recording member;
- and
- a power supply apparatus configured to supply electric 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 with the primary winding of the transformer;
- a second switching element connected in parallel with the primary winding of the transformer;
- a capacitor connected in series with the second switching element and connected in parallel with the primary winding of the transformer together with the second switching element;
- a feedback unit configured to output a feedback voltage to a primary side according to a voltage induced in the secondary winding of the transformer;
- and
- a control unit configured to control turn-on or turn-off of the first switching element and the second switching element based on the feedback voltage, the control unit configured to performing an operation of alternately repeating a first period in which a switching operation is performed and a second period in which the switching operation is stopped, the switching operation being an operation of alternately turning on or turning off the first switching element and the second switching element before and after a dead time in which both the first switching element and the second switching element are in a turn-off condition,
- a current detection unit configured to detect a current that flows through the first switching element;
- and
- a voltage detection unit configured to detect an input voltage supplied to the primary side of the transformer,
- wherein the control unit controls a turn-on time of the first switching element based on the feedback voltage, controls a turn-on time of the second switching element based on detection results of the current detection unit and the voltage detection unit, and performs switching between a continuous control and an intermittent control based on the feedback voltage, the continuous control being a control to perform an operation of continuing the first period, the intermittent control being a control to perform an operation of alternately repeating the first period and the second period.
12 more elements
Dependencies are inferred from the claim text.