Power supply system and power control circuit thereof
AssigneeVIA Technologies, Inc.
InventorWei-Te Huang
Life of this patent
Estimating the term…
Abstract
A power supply system for supplying power to a chipset of an electronic device is provided. The power supply system includes a voltage converter, converting a supply voltage of a power supply into a predetermined voltage and supplying the predetermined voltage to the chipset, and a power control circuit connected between the voltage converter and the power supply. The power control circuit further includes a switch and a switch controller. The switch has a first terminal connected to the power supply, a second terminal connected to the voltage converter and a control terminal The switch controller, connected to the control terminal of the switch and the chipset, controls the switch to couple the power supply to the voltage converter according to the turning-on of the power supply system.
Claims16
A power supply system for supplying power to a chipset of an electronic device, comprising:
- a voltage converter, converting a supply voltage of a power supply into a predetermined voltage and outputting the predetermined voltage to the chipset;
- and
- a power control circuit coupled between the voltage converter and the power supply, comprising:
- a switch, having a first terminal coupled to the power supply, a second terminal coupled to the voltage converter, and a control terminal;
- and
- a first switch controller coupled to the control terminal of the switch and the chipset, controlling the switch to couple the power supply to the voltage converter according to a turning-on event of the power supply system,
- wherein the switch does not couple the power supply to the voltage converter before the turning-on event of the power supply system.
A power control circuit for a power supply system supplying power to a chipset of an electronic device, wherein the power supply system comprises a power supply and a voltage converter, and the voltage converter converts a supply voltage of the power supply into a predetermined voltage and outputs the predetermined voltage to the chipset, comprising:
- a P-type transistor switch, having a first terminal coupled to the power supply, a second terminal coupled to the voltage converter and a control terminal;
- a power-on switch, having a first terminal coupled to a reference voltage and a second terminal;
- and
- a first diode, having a cathode coupled to the second terminal of the power-on switch and an anode coupled to the control terminal of the P-type transistor switch,
- wherein, when the power-on switch is turned on, the P-type transistor switch couples the power supply to the voltage converter,
- wherein the P-type transistor switch does not couple the power supply to the voltage converter before the power-on switch being turned on.
Dependencies are inferred from the claim text.