Patent ID: 8080903

Claim:
A power supply circuit, comprising: a first power circuit having a first power output terminal and a first ground output terminal, the first power circuit comprising a first filter circuit; a second power circuit having a second power output terminal and a second ground output terminal, the second power circuit comprising a second filter circuit; and a SATA control chip having a first input terminal, a second input terminal, a third input terminal, and a fourth input terminal, the first power output terminal, the first ground output terminal, the second power output terminal, and the second ground output terminal being electrically coupled to the SATA control chip via the first input terminal, the second input terminal, the third input terminal, and the fourth input terminal respectively, wherein the first and second power circuits provide power to the SATA control chip via the first and second filter circuits respectively; wherein the first power circuit further comprises a first power input terminal, a first bead inductor and a first copper foil; the first filter circuit comprises a first capacitor and a second capacitor, first terminals of the first and second capacitors are electrically coupled to the first power input terminal via the first bead inductor, and are electrically coupled to the first input terminal via the first power output terminal, second terminals of the first and second capacitors are grounded via the first copper foil, and are electrically coupled to the second input terminal via the first ground output terminal.