POWER SUPPLY DEVICE, IMAGE FORMING APPARATUS, AND POWER SUPPLY METHOD
First Claim
1. An image forming apparatus comprising:
- a capacitor that is charged by an external power source, and dischargably stores therein power;
a load that requires power;
a control unit that controls the load; and
a power-supply unit that causes the capacitor to supply power to the load and the control unit before a voltage of the external power source drops below a threshold level where malfunction of any one of the load and the control unit occurs, and stops the supply of power from the capacitor to the load and the control unit after the voltage rises to the threshold level.
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Accused Products
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.
32 Citations
19 Claims
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1. An image forming apparatus comprising:
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a capacitor that is charged by an external power source, and dischargably stores therein power; a load that requires power; a control unit that controls the load; and a power-supply unit that causes the capacitor to supply power to the load and the control unit before a voltage of the external power source drops below a threshold level where malfunction of any one of the load and the control unit occurs, and stops the supply of power from the capacitor to the load and the control unit after the voltage rises to the threshold level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A power supply device for an apparatus including a load that requires power and a control unit that controls the load, the power supply device comprising:
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a capacitor that is charged by an external power source, and dischargably stores therein power; and a power-supply unit that causes the capacitor to supply power to the load and the control unit before a voltage of the external power source drops below a threshold level where malfunction of the apparatus occurs, and stops the supply of power from the capacitor to the load and the control unit after the voltage rises to the threshold level.
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19. A power supply method of supplying power to an apparatus, the apparatus including a load requiring power and a control unit that controls the load, the power supply method comprising:
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charging a capacitor by an external power source; providing 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 apparatus occurs; and stopping the power supply from the capacitor after the voltage has risen to the threshold level.
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Specification