| 摘要 |
PROBLEM TO BE SOLVED: To prevent the generation of a large current when switching from a main power supply to an auxiliary power supply in a power supply device with the main power supply and the auxiliary power supply having a target voltage lower than that of the main power supply. SOLUTION: The main power supply 10 is controlled so that an output voltage Vout of the power supply device 1 can be maintained at a target voltage Vref1. The auxiliary power supply 20 is connected in parallel to the main power supply 10, and has a target voltage Vref2 set at lower than the target voltage Vref1. The auxiliary power supply 20 includes a switch circuit to be controlled based on a pulse signal. In switching from the main power supply 10 to the auxiliary power supply 20, a control circuit 30 generates a pulse signal having a duty for obtaining the target voltage Vref2 using feedforward control, and supplies the generated pulse signal to a switch circuit of the auxiliary power supply 20. COPYRIGHT: (C)2009,JPO&INPIT
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