| 摘要 |
PROBLEM TO BE SOLVED: To provide a power supply device and its power supply feed method which can attain power, saving without causing reduction in the performance of equipment, by switching the power supply voltage according to the use state of the equipment, and further, can obtain high efficiency, even when a small output current for eliminating wasteful consumption of power, without generating a leakage current due to nonconformity of the voltage difference conditions between loads and noise adversely affecting the performance of the equipment, at voltage switching. SOLUTION: The output voltage Vo1 of a switching regulator 2 is input to a first load 9a as the power supply voltage; the output voltage Vo2 of a series regulator 3 is input to a second load 9b as the power supply voltage. The first load 9a is operated by a power supply voltage which is larger than that of the second load 9b so that a control circuit 22 controls each output voltage of the switching regulator 2 and the series regulator 3 so as to satisfy Vo1>Vo2. COPYRIGHT: (C)2008,JPO&INPIT
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