Power supply system and power control circuit thereof

Patent metadata

Field	Value
Publication number	US-9312693-B2
Application number	US-201314046653-A
Country	US
Kind code	B2
Filing date	Oct 4, 2013
Priority date	Oct 9, 2012
Publication date	Apr 12, 2016
Grant date	Apr 12, 2016

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.

First claim

What is claimed is:

1. 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.

2. The power supply system as claimed in claim 1 , wherein the power control circuit further comprises:
a second switch controller coupled between the control terminal of the switch and the chipset, controlling the switch to maintain the coupling of the power supply to the voltage converter when the chipset is in operation.

3. The power supply system as claimed in claim 2 , wherein the second switch controller further comprises:
an N-type transistor switch, having a first terminal coupled to the control terminal of the switch, a second terminal coupled to the reference voltage, and a control terminal; and
a third diode, having a cathode coupled to the control terminal of the N-type transistor switch and an anode coupled to the chipset,
wherein, when the chipset is in operation, the chipset continuously outputs a high voltage level signal to the N-type transistor switch via the third diode.

4. The power supply system as claimed in claim 3 , wherein the power control circuit further comprises:
a power recovery circuit controlling the switch to couple the power supply to the voltage converter when the chipset does not output the high voltage level signal to the N-type transistor switch,
wherein after a temporary failure of the power supply ends, the chipset outputs the high voltage level signal to the N-type transistor switch via the third diode according to a restart enable status stored in a register of the chipset.

5. The power supply system as claimed in claim 4 , wherein the power recovery circuit comprises:
a first capacitor coupled between the first terminal and the control terminal of the switch;
a resistor coupled between the first terminal and the control terminal of the switch; and
a second capacitor coupled between the control terminal of the switch and the reference voltage.

6. The power supply system as claimed in claim 3 , wherein the power control circuit further comprises:
a fourth diode, having a cathode coupled to the control terminal of the N-type transistor switch and an anode receiving a disable signal,
wherein when the disable signal is at a high voltage level, the chipset is turned on according to a wake-on-LAN signal received via a network without turning on the power-on switch.

7. The power supply system as claimed in claim 1 , wherein the first switch controller further comprises:
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 switch,
wherein when the power-on switch is turned on, the switch couples the power supply to the voltage converter.

8. The power supply system as claimed in claim 7 , wherein the power control circuit further comprises:
a second diode, having a cathode coupled to the second terminal of the power-on switch and an anode coupled to the chipset, and informing the chipset of the turning-on event of the power-on switch.

9. The power supply system as claimed in claim 1 , wherein the switch is a P-type transistor switch.

10. The power supply system as claimed in claim 1 , wherein the voltage converter further comprises:
an output stage circuit coupled to the power supply and the chipset, receiving the supply voltage of the power supply; and
a controller coupled to the second terminal of the switch and the output stage circuit, receiving an operation voltage outputted from the power supply via the switch, and controlling the output stage circuit to output the predetermined voltage to the chipset.

11. The power supply system as claimed in claim 1 , wherein the voltage converter further comprises:
an output stage circuit coupled to the second terminal of the switch and the chipset, receiving the supply voltage of the power supply via the switch; and
a controller coupled to the power supply and the output stage circuit, receiving an operation voltage outputted from the power supply, and controlling the output stage circuit to output the predetermined voltage to the chipset.

12. 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.

13. The power control circuit as claimed in claim 12 , further comprising:
a second diode, having a cathode coupled to the second terminal of the power-on switch and an anode coupled to the chipset, and informing the chipset of a turning-on event of the power-on switch.

14. The power control circuit as claimed in claim 12 , further comprising:
an N-type transistor switch, having a first terminal coupled to the control terminal of the P-type transistor switch, a second terminal coupled to the reference voltage, and a control terminal; and
a third diode, having a cathode coupled to the control terminal of the N-type transistor switch and an anode coupled to the chipset,
wherein, when the chipset is in operation, the chipset continuously outputs a high voltage level signal to the N-type transistor switch via the third diode.

15. The power control circuit as claimed in claim 14 , further comprising:
a power recovery circuit, comprising:
a first capacitor coupled between the first terminal and the control terminal of the P-type transistor switch;
a resistor coupled between the first terminal and the control terminal of the P-type transistor switch; and
a second capacitor coupled between the control terminal of the P-type transistor switch and the reference voltage,

wherein, after a temporary failure of the power supply ends, the chipset outputs the high voltage level signal to the N-type transistor switch via the third diode according to a restart enable status stored in a register of the chipset.

16. The power control circuit as claimed in claim 14 , further comprising:

Assignees

• Via Tech Inc

Inventors

• Huang Wei-Te

Classifications

• H02J1/06 Primary

  Two-wire DC power distribution systems · CPC title

• G06F1/26 Primary

  Power supply means, e.g. regulation thereof (for memories G11C) · CPC title

• H02M2001/0096

  Electricity · mapped topic

• H02M1/36

  Means for starting or stopping converters · CPC title

• Y10T307/766

  Cross-Sectional Technologies · mapped topic