| 摘要 |
PROBLEM TO BE SOLVED: To miniaturize a supply device as a whole, and to reduce the cost thereof. SOLUTION: An AC/DC power supply device is provided with a switching regulator 10 for AC input for converting inputted AC100 V into DC117 V and DC12 V, a switching regulator 20 for DC input for converting DC12 to 13 V into DC117 V, a chopper type switching regulator 30 to smooth the DC12 to 13 V by a reactor 331 and a capacitor 333, etc. A transformer 13 for transmitting the input to the output side is provided on the switching regulator 10, and the transformer 13 is provided with the reactor 331 separately from primary and secondary coils P1, S1, S2. In order to prevent the voltage DC117 V and DC12 V generated by the switching regulator 10 from being influenced by the voltage induced by the reactor 331, a switch part 40 for interrupting the reactor 331 from the capacitor 332, when the switching regulator 10 is operated, is provided.
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