Patent ID: 8446053

Claim:
A computer system comprising: a power supply comprising a plurality of direct current (DC) voltage output terminals, to output a plurality of DC voltages to a motherboard of the computer system; a plurality of first power interfaces each connected to one of the plurality of the DC voltage output terminals of the power supply, to output the DC voltages to first peripheral devices; a second power interface; and a voltage regulating module comprising an input terminal and an output terminal, the input terminal connected to one of the plurality of DC voltage output terminals of the power supply, to receive the DC voltage from the connected DC voltage output terminal, the output terminal connected to the second power interface, to output a regulated second voltage to a second peripheral device through the second power interface; wherein the voltage regulating module comprises a voltage control chip, a field effect transistor (FET), a zener diode, an inductance, a first resistor, a second resistor, a plurality of third resistors, and a plurality of switches corresponding, to the third resistors, a control pin of the voltage control chip is connected to a gate of the FET, as source of the FET is connected to a current pin of the voltage control chip and also grounded through the first resistor, a drain of the FET is connected to the DC voltage output terminal of the power supply through the inductance and also connected to an anode of the zener diode, a cathode of the zener diode is connected to two voltage pins of the voltage control chip and also connected to the second power interface, the second resistor is connected between the cathode of the zener diode and a feedback pin of the voltage control chip, each of the third resistors and the corresponding switch are connected in series between the feedback pin of the voltage control chip and ground; before the peripheral device is connected to the second power interface, the control pin of the voltage control chip outputs a high level signal, the FET is turned on, the drain of the FET is at a low level, the zener diode is turned off, and the connected DC voltage output terminal of the power supply provides a voltage to charge the inductance; when the peripheral device is connected to the second power interface, the control pin of the voltage control chip outputs a low level signal, FET is turned off, the inductance discharges, the zener diode is turned on, when one of the switches is pressed, the second resistor and the corresponding third resistor are configured to the divide voltage, such that the voltage regulating module outputs a corresponding voltage to the second power interface.