Patent ID: 8593118

Claim:
A power supply apparatus for receiving a first input voltage and generating an output voltage to a system circuit, said power supply apparatus comprising: a first output power circuit including a first switching circuit for receiving said first input voltage, wherein said first switching circuit is alternately conducted or shut off, so that said first input voltage is converted into a first internal output voltage; a first output protection circuit connected to a power output terminal of said first output power circuit for limiting a current direction, wherein an electrical energy of said first internal output voltage is transmitted to said system circuit through said first output protection circuit; a first output capacitor connected to said power output terminal of said first output power circuit; a first pre-charging circuit interconnected between a power input terminal and a power output terminal of said first output protection circuit for providing a first pre-charging path; and a first power supply control circuit connected to a control terminal of said first switching circuit and said power output terminal of said first output power circuit for determining whether a first pulse width modulation signal is transmitted to said control terminal of said first switching circuit according to a first power-on signal, wherein when said first power-on signal is switched from a disabled status to an enabled status, a first pulse width modulation signal having a maximum duty cycle is transmitted from said first power supply control circuit to said control terminal of said first switching circuit, thereby enabling said first output power circuit, wherein said first power supply control circuit comprises: a first feedback circuit connected to said power output terminal of said first output power circuit for generating a first feedback signal according to said first internal output voltage; and a first micro-controller connected to a control terminal of a second switching circuit of said first power supply control circuit, a first output power control circuit of said first power supply control circuit and said power output terminal of said first output power circuit, wherein said first micro-controller controls operations of said first output power control circuit and on/off statuses of said second switching circuit according to said first power-on signal.