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US 2019/0058406 A1Published application
Power supply apparatus and image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorsHiroki Asano, Yasuhiro Shimura
Life of this patent
Estimating the term…
Abstract
The power supply apparatus switches the capacitance of a resonance capacitor to a first value at the time of a continuous operation, and switches the capacitance of the resonance capacitor to a second value smaller than the first value at the time of an intermittent operation.
Claims19
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 resonance capacitor unit connected in parallel with the first switching element;
- a second switching element connected in parallel with the primary winding of the transformer;
- a capacitor connected in series to the second switching element, and connected in parallel with the primary winding of the transformer with the second switching element;
- a feedback unit configured to output information according to an output voltage obtained by rectifying and smoothing a voltage induced by the secondary winding of the transformer;
- and
- a control unit configured to, based on the information input from the feedback unit, control turn-on or turn-off of the first switching element by a first control signal, and to control turn-on or turn-off of the second switching element by a second control signal,
- wherein the control unit is capable of performing a continuous operation repeating a period for performing a switching operation that alternately turns on or turns off the first switching element and the second switching element before and after a dead time at which both of the first switching element and the second switching element are turned off, and capable of performing an intermittent operation alternately repeating a period for performing the switching operation and a period for stopping the switching operation, and
- wherein the resonance capacitor unit includes a first resonance capacitor, a second resonance capacitor, and a third switching element connected in series to the second resonance capacitor,
- wherein the second resonance capacitor and the third switching element are connected in parallel with the first resonance capacitor, and
- wherein the control unit turns on the third switching element at the time of the continuous operation, and turns off the third switching element at the time of the intermittent operation.
9 more elements
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 resonance capacitor unit connected in parallel with the first switching element;
- a second switching element connected in parallel with the primary winding of the transformer;
- a capacitor connected in series to the second switching element, and connected in parallel with the primary winding of the transformer with the second switching element;
- a feedback unit configured to output information according to an output voltage obtained by rectifying and smoothing a voltage induced by the secondary winding of the transformer;
- a control unit configured to, based on the information input from the feedback unit, control turn-on or turn-off of the first switching element by a first control signal, and to control turn-on or turn-off of the second switching element by a second control signal;
- and
- an instructing unit configured to give an instruction for switching a target voltage of the output voltage to a first voltage, or to a second voltage higher than the first voltage, according to a signal from the outside,
- the control unit being capable of performing a continuous operation repeating a period for performing a switching operation that alternately turns on or turns off the first switching element and the second switching element before and after a dead time at which both of the first switching element and the second switching element are turned off, and capable of performing an intermittent operation alternately repeating a period for performing the switching operation and a period for stopping the switching operation, and
- wherein the control unit being capable of switching the voltage according to the instruction from the instructing unit,
- wherein a resonance capacitor unit includes a first resonance capacitor, a second resonance capacitor, and a third switching element connected in series to the second resonance capacitor,
- wherein the second resonance capacitor and the third switching element are connected in parallel with the first resonance capacitor, and
- wherein the control unit turns on the third switching element when the target voltage is the second voltage, and turns off the third switching element when the target voltage is the first voltage.
11 more elements
An image forming apparatus comprising:
- an image forming unit configured to perform image formation on a recording material;
- and
- a power supply apparatus configured 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 resonance capacitor unit connected in parallel with the first switching element;
- a second switching element connected in parallel with the primary winding of the transformer;
- a capacitor connected in series to the second switching element, and connected in parallel with the primary winding of the transformer with the second switching element;
- a feedback unit configured to output information according to an output voltage obtained by rectifying and smoothing a voltage induced by the secondary winding of the transformer;
- and
- a control unit configured to, based on the information input from the feedback unit, control turn-on or turn-off of the first switching element by a first control signal, and to control turn-on or turn-off of the second switching element by a second control signal,
- wherein the control unit is capable of performing a continuous operation repeating a period for performing a switching operation that alternately turns on or turns off the first switching element and the second switching element before and after a dead time at which both of the first switching element and the second switching element are turned off, and capable of performing an intermittent operation alternately repeating a period for performing the switching operation and a period for stopping the switching operation,
- wherein the resonance capacitor unit includes a first resonance capacitor, a second resonance capacitor, and a third switching element connected in series to the second resonance capacitor,
- wherein the second resonance capacitor and the third switching element are connected in parallel with the first resonance capacitor, and
- wherein the control unit turns on the third switching element at the time of the continuous operation, and turns off the third switching element at the time of the intermittent operation.
13 more elements
An image forming apparatus comprising:
- an image forming unit configured to perform image formation on a recording material;
- and
- a power supply apparatus configured 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 resonance capacitor unit connected in parallel with the first switching element;
- a second switching element connected in parallel with the primary winding of the transformer;
- a capacitor connected in series to the second switching element, and connected in parallel with the primary winding of the transformer with the second switching element;
- a feedback unit configured to output information according to an output voltage obtained by rectifying and smoothing a voltage induced by the secondary winding of the transformer;
- a control unit configured to, based on the information input from the feedback unit, control turn-on or turn-off of the first switching element by a first control signal, and to control turn-on or turn-off of the second switching element by a second control signal;
- and
- an instructing unit configured to give an instruction for switching a target voltage of the output voltage to a first voltage, or to a second voltage higher than the first voltage, according to a signal from the outside,
- wherein the control unit is capable of performing a continuous operation repeating a period for performing a switching operation that alternately turns on or turns off the first switching element and the second switching element before and after a dead time at which both of the first switching element and the second switching element are turned off, and capable of performing an intermittent operation alternately repeating a period for performing the switching operation and a period for stopping the switching operation, and
- wherein the control unit is capable of switching the target voltage according to the instruction from the instructing unit,
- wherein a resonance capacitor unit includes a first resonance capacitor, a second resonance capacitor, and a third switching element connected in series to the second resonance capacitor,
- wherein the second resonance capacitor and the third switching element are connected in parallel with the first resonance capacitor, and
- wherein the control unit turns on the third switching element when the target voltage is the second voltage, and turns off the third switching element when the target voltage is the first voltage.
15 more elements
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 resonance capacitor connected in parallel with the first switching element;
- a second switching element connected in parallel with the primary winding of the transformer;
- a capacitor connected in series to the second switching element, and connected in parallel with the primary winding of the transformer with the second switching element;
- a feedback unit configured to output information according to a voltage induced by the secondary winding of the transformer;
- a control unit configured to, based on the information input from the feedback unit, control turn-on or turn-off of the first switching element by a first control signal, and to control turn-on or turn-off of the second switching element by a second control signal, the control unit being capable of performing a continuous operation repeating a period for performing a switching operation that alternately turns on or turns off the first switching element and the second switching element before and after a dead time at which both of the first switching element and the second switching element are turned off, and capable of performing an intermittent operation alternately repeating a period for performing the switching operation and a period for stopping the switching operation;
- and
- a capacitance switching unit configured to switch the capacitance of the resonance capacitor to a first value at the time of the continuous operation, and to switch the capacitance of the resonance capacitor to a second value smaller than the first value at the time of the intermittent operation.
6 more elements
An image forming apparatus comprising:
- an image forming unit configured to perform image formation on a recording material;
- and
- a power supply apparatus configured 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 resonance capacitor connected in parallel with the first switching element;
- a second switching element connected in parallel with the primary winding of the transformer;
- a capacitor connected in series to the second switching element, and connected in parallel with the primary winding of the transformer with the second switching element;
- a feedback unit configured to output information according to a voltage induced by the secondary winding of the transformer;
- a control unit configured to, based on the information input from the feedback unit, control turn-on or turn-off of the first switching element by a first control signal, and to control turn-on or turn-off of the second switching element by a second control signal, the control unit being capable of performing a continuous operation repeating a period for performing a switching operation that alternately turns on or turns off the first switching element and the second switching element before and after a dead time at which both of the first switching element and the second switching element are turned off, and capable of performing an intermittent operation alternately repeating a period for performing the switching operation and a period for stopping the switching operation;
- and
- a capacitance switching unit configured to switch the capacitance of the resonance capacitor to a first value at the time of the continuous operation, and to switch the capacitance of the resonance capacitor to a second value smaller than the first value at the time of the intermittent operation.
10 more elements
Dependencies are inferred from the claim text.