| 摘要 |
A power supply includes an AC-to-DC circuit, a DC-to-DC circuit, an interface used by both of the AC-to-DC circuit and the DC-to-DC circuit, and a control circuit for controlling the interface. The interface includes an ACL/DC+ input terminal, an ACN/DC− input terminal and a ground. The control circuit includes an AC/DC detecting circuit for determining whether an input voltage is AC or DC, an AC/DC converting circuit for selectively conducting AC or DC, and a conversion-controlling circuit for controlling the direction of the input voltage based on the determination in the AC/DC detecting circuit.
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