Power supply device and image forming apparatus

A power supply device, comprising:na transformer in which a primary side and a secondary side are insulated with each other;a switching unit configured to switch the primary side of the transformer;a detection unit configured to detect a current flowing on the primary side to output a first signal corresponding to the detected current;a transmission unit configured to transmit a second signal corresponding to an output voltage from the secondary side to the primary side; anda control unit configured to control an operation of the switching unit in accordance with the second signal from the transmission unit and the first signal output from the detection unit; anda correction unit configured to correct the first signal output from the detection unit according to a resonance frequency,wherein, when a switching frequency of the switching unit is reduced, the control unit controls a turn-on time of the switching unit based on the second signal from the transmission unit and the first signal corrected by the correction unit.

A power supply device, comprising:na transformer in which a primary side and a secondary side are insulated with each other;a switching unit configured to switch the primary side of the transformer;a detection unit configured to detect a current flowing on the primary side to output a first signal corresponding to the detected current;a transmission unit configured to transmit a second signal corresponding to an output voltage from the secondary side to the primary side;a control unit configured to control an operation of the switching unit in accordance with the second signal from the transmission unit; anda voltage reduction unit provided on the secondary side, the voltage reduction unit configured to reduce the second signal transmitted by the transmission unit,wherein, when a switching frequency of the switching unit is reduced, the control unit controls a timing when the switching unit is turned on by reducing the second signal transmitted by the transmission unit, by the voltage reduction unit.

An image forming apparatus, comprising:nan image forming unit for forming an image on a recording material;a driving unit for driving the image forming unit; anda power supply for supplying electric power to the driving unit,wherein the power supply comprises:a transformer in which a primary side and a secondary side are insulated with each other;a switching unit configured to switch the primary side of the transformer;a detection unit configured to detect a current flowing on the primary side to output a first signal corresponding to the detected current;a transmission unit configured to transmit a second signal corresponding to an output voltage from the secondary side to the primary side;a control unit configured to control an operation of the switching unit in accordance with the second signal from the transmission unit and the first signal from the detection unit; anda correction unit configured to correct the first signal output from the detection unit according to a resonance frequency,wherein, when a switching frequency of the switching unit is reduced, the control unit controls a turn-on time of the switching unit based on the output voltage from the transmission unit and the first signal corrected by the correction unit.

An image forming apparatus, comprising:nan image forming unit for forming an image on a recording material;a controller for controlling an operation of the image forming unit; anda power supply for supplying electric power to the controller,wherein the power supply comprises:a transformer in which a primary side and a secondary side are insulated with each other;a switching unit configured to switch the primary side of the transformer;a detection unit configured to detect a current flowing on the primary side to output a first signal corresponding to the detected current;a transmission unit configured to transmit a second signal corresponding to an output voltage from the secondary side to the primary side;a control unit configured to control an operation of the switching unit in accordance with the second signal from the transmission unit and the first signal output from the detection unit; anda correction unit for correcting the first signal output from the detection unit according to a resonance frequency,wherein, when a switching frequency of the switching unit is reduced, the control unit controls a turn-on time of the switching unit based on the output voltage from the transmission unit and the first signal corrected by the correction unit.

An image forming apparatus, comprising:nan image forming unit for forming an image on a recording material;a driving unit for driving the image forming unit; anda power supply for supplying electric power to the driving unit,wherein the power supply comprises:a transformer in which a primary side and a secondary side are insulated with each other;a switching unit configured to switch the primary side of the transformer;a detection unit configured to detect a current flowing on the primary side to output a first signal corresponding to the detected current;a transmission unit configured to transmit a second signal corresponding to an output voltage from the secondary side to the primary side;a control unit configured to control an operation of the switching unit in accordance with the second signal from the transmission unit; anda voltage reduction unit provided on the secondary side, the voltage reduction unit configured to reduce the second signal transmitted by the transmission unit,wherein, when a switching frequency of the switching unit, is reduced, the control unit controls a timing when the switching unit is turned on, by reducing the second signal transmitted by the transmission unit, by the voltage reduction unit.

An image forming apparatus, comprising:nan image forming unit for forming an image on a recording material;a controller for controlling an operation of the image forming unit; anda power supply for supplying electric power to the controller,wherein the power supply comprises:a transformer in which a primary side and a secondary side are insulated with each other;a switching unit configured to switch the primary side of the transformer;a detection unit configured to detect a current flowing on the primary side to output a first signal corresponding to the detected current;a transmission unit configured to transmit a second signal correspond to an output voltage from the secondary side to the primary side;a control unit configured to control an operation of the switching unit in accordance with the second signal from the transmission unit; anda voltage reduction unit provided on the secondary side, the voltage reduction unit configured to reduce the second signal transmitted by the transmission unit,wherein, when a switching frequency of the switching unit, is reduced, the control unit controls a timing when the switching unit is turned on, by reducing the second signal transmitted by the transmission unit, by the voltage reduction unit.