Power supply control apparatus and electric device
First Claim
Patent Images
1. A power supply control apparatus comprising:
- an active filter which converts an AC voltage supplied from an AC power supply to a DC voltage;
a DC-DC converter which converts the DC voltage converted by said active filter to voltages at predetermined levels, and respectively supplies the voltages to a load and a load control unit that controls said load;
a power supply control unit which controls operation of said DC-DC converter; and
a detection unit which detects disconnection of the AC power supply, wherein said power supply control unit controls said DC-DC converter in order to allow said DC-DC converter to continue supply of the voltage to said load control unit for a predetermined time when said detection unit detects disconnection of the AC power supply.
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Abstract
In the image formation apparatus, an active filter converts an AC power supply supplied from an AC power supply to a DC voltage, and first and second DC-DC converters convert the DC voltage converted by the active filter to voltages at predetermined levels and respectively supplies the voltages to an image forming engine and an engine control unit. A power supply control unit stops the operation of the first DC-DC converter in order to allow the second DC-DC converter to continue supply of the voltage to the engine control unit when disconnection of the AC power supply is detected.
14 Citations
10 Claims
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1. A power supply control apparatus comprising:
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an active filter which converts an AC voltage supplied from an AC power supply to a DC voltage;
a DC-DC converter which converts the DC voltage converted by said active filter to voltages at predetermined levels, and respectively supplies the voltages to a load and a load control unit that controls said load;
a power supply control unit which controls operation of said DC-DC converter; and
a detection unit which detects disconnection of the AC power supply, wherein said power supply control unit controls said DC-DC converter in order to allow said DC-DC converter to continue supply of the voltage to said load control unit for a predetermined time when said detection unit detects disconnection of the AC power supply. - View Dependent Claims (2, 3, 4, 5)
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6. An image formation apparatus comprising:
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an image forming engine which emits laser beams corresponding to image information onto a photoreceptor to form an electrostatic latent image on the photoreceptor, forms a toner image on the electrostatic latent image, and transfers a formed toner image to a transfer sheet;
an image forming engine control unit which controls said image forming engine;
an active filter which converts an AC voltage supplied from an AC power supply to a DC voltage;
a DC-DC converter which converts the DC voltage converted by said active filter to voltages at predetermined levels, and respectively supplies the voltages to said image forming engine and said image forming engine control unit;
a power supply control unit which controls operation of said DC-DC converter; and
a detection unit which detects disconnection of the AC power supply, wherein said power supply control unit controls said DC-DC converter in order to allow said DC-DC converter to continue the supply of the voltage to said image forming engine control unit for a predetermined time when said detection unit detects disconnection of the AC power supply. - View Dependent Claims (7, 8, 9, 10)
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Specification