Power supply circuit and portable device

Details Power supply circuit and portable device Power supply circuit and portable device

2006-02-07

2010-12-07

Owens, Douglas W (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Reexamination Certificate

active

07847488

ABSTRACT:
A power supply circuit has a charge pump (CHP) step-up circuit including multiple CHP units for stepping up a given power supply voltage to a step-up voltage higher than the power supply voltage, and, based on an output voltage setting signal, converts the step-up voltage to a required output voltage. A comparator compares the detection voltage associated with the output voltage with a reference voltage to generate a comparison signal. In supplying a required output voltage, the number of operable CHP units can be changed to control the step-up voltage based on the comparison signal.

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Official Communication for PCT Application No. PCT/JP2006/302411; mailed Apr. 4, 2006.

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