Power supply device, image forming apparatus, and power supply method
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United States of America Patent
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May 24, 2011
Grant Date -
Jun 26, 2008
app pub date -
Dec 19, 2007
filing date -
Dec 22, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
A power supply device supplies power to an image forming apparatus. The image forming apparatus includes a load and a control unit. The load requires power, and is controlled by the control unit. The power supply includes a capacitor and a power-supply unit. The capacitor is charged by an external power source, and dischargably stores therein power. The power-supply unit provides power supply from the capacitor to the load and the control unit before voltage of the external power source drops below a threshold level where malfunction of the image forming apparatus occurs. After the voltage recovers to the threshold level, the power-supply unit stops the power supply from the capacitor.
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