Power supply device and method utilizable in electronic apparatus
AssigneeBrother Kogyo Kabushiki Kaisha
InventorYukichi Sawaki
Life of this patent
Estimating the term…
Abstract
A power supply device and power supply method that may be used with an electronic apparatus, such as a facsimile machine. In the device and method, a communication device is placed in a sleep mode while a copy process is conducted. During the sleep mode, power is not supplied to the circuits of the communication device that are necessary for transmission with an external transmission line. Thus, a load current loaded to a DC voltage of +5V can be efficiently reduced. As a result, the energy quantity consumed in a regulator of the power supply device may be reduced. Accordingly, heating of the regulator can be restrained and useless energy consumption may be prevented.
Claims32
A facsimile apparatus, comprising:
- a first DC voltage producing part which produces a stable first DC voltage from an AC voltage;
- a second DC voltage producing part which produces a stable second DC voltage from a non-stable DC voltage that changes according to a load current loaded to the first DC voltage producing part;
- and
- reducing means for reducing a load current loaded to the second DC voltage producing part when the non-stable DC voltage increases.
A power supply device, comprising:
- a first DC voltage producing part which produces a stable first DC voltage from an AC voltage;
- a second DC voltage producing part which produces a stable second DC voltage from a non-stable DC voltage that changes according to a load current loaded to the first DC voltage producing part;
- and
- reducing means for reducing a load current loaded to the second DC voltage producing part when the non-stable DC voltage increases.
A method of providing power to a facsimile apparatus, comprising:
- producing a stable first DC voltage from an AC voltage using a first DC voltage producing part;
- producing, using a second DC voltage producing part, a stable second DC voltage from a non-stable DC voltage that changes according to a load current loaded to the first DC voltage producing part;
- and
- reducing a load current loaded to the second DC voltage producing part when the non-stable DC voltage increases.
Dependencies are inferred from the claim text.