| 摘要 |
PROBLEM TO BE SOLVED: To reduce power consumption by performing control excellent in power conversion efficiency at low cost in two or more states such as, for example, an operating state, a waiting state, an energy saving mode state, etc. of an apparatuses. SOLUTION: The voltage of a power source is divided with a resistor R6 and a resistor R7, and the obtained divided voltage, that is, the voltage of the A/D port of CPU110 is detected with the CPU110, and based on this detected voltage, the output of the feedback of the power source is controlled compulsively by the CPU110 thereby reducing the number of times of switching of the MOSFET Q1 of the power source. COPYRIGHT: (C)2007,JPO&INPIT
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