Electronic device and motherboard and protecting circuit of electronic device

Patent metadata

Field	Value
Publication number	US-9553447-B2
Application number	US-201514594563-A
Country	US
Kind code	B2
Filing date	Jan 12, 2015
Priority date	Nov 28, 2014
Publication date	Jan 24, 2017
Grant date	Jan 24, 2017

Abstract

An electronic device includes a chassis with a power button and a motherboard. The motherboard includes a slot, a controller chip, a startup circuit coupling to the power button, and a protecting circuit. The protecting circuit includes an electronic switch and an AND gate circuit. The electronic switch includes a first terminal coupled to the slot, a second terminal coupled to a ground, and a third terminal coupled to a first power supply through a first resistor. The AND gate circuit includes a first input end coupled to the first power supply, a second input end coupled to the controller chip, and an output end coupled to the startup circuit. The power button is pressed down, the controller chip outputs a control signal with a high voltage to the second input end of the AND gate circuit.

First claim

What is claimed is:

1. A protecting circuit for a motherboard with a slot, a controller chip, and a startup circuit coupled to a power button, comprising:
an electronic switch comprising a first terminal coupled to the slot, a second terminal coupled to a ground, and a third terminal coupled to a first power supply through a first resistor; and
an AND gate circuit comprising a first input end coupled to the first power supply, a second input end coupled to the controller chip, and an output end coupled to the startup circuit;
wherein when the power button is pressed down, the controller chip outputs a control signal with a high voltage to the second input end of the AND gate circuit, and wherein when there is a short-circuiting occurring between two adjacent pins of the slot, the electronic switch is turned on, the first input end of the AND gate circuit receives a low voltage, the output end of the AND gate circuit outputs a low voltage to the startup circuit, and the startup circuit cannot perform start-up action.

2. The protecting circuit of claim 1 , wherein when there is no short-circuiting occurs between two adjacent pins of the slot, the electronic switch is turned off, the first input end of the AND gate circuit receives a high voltage, the output end of the AND gate circuit outputs a high voltage to the startup circuit, and the startup circuit performs start-up action.

3. The protecting circuit of claim 1 , wherein the AND gate circuit comprises a first diode and a second diode, an anode of the second diode is coupled to a second power supply through a second resistor and as the output end of the AND gate circuit coupled to the startup circuit, a cathode of the first diode as a first input end of the AND gate circuit coupled to the first power supply, an anode of the second diode is coupled to the anode of the first diode, and a cathode of the second diode as the second input end of the AND gate circuit is coupled to the controller chip.

4. The protecting circuit of claim 1 , wherein the controller chip is a super I/O chip.

5. A motherboard comprising:
a slot;
a controller chip;
a startup circuit coupling to a power button; and
a protecting circuit comprising:
an electronic switch comprising a first terminal coupled to the slot, a second terminal coupled to a ground, and a third terminal coupled to a first power supply through a first resistor; and
an AND gate circuit comprising a first input end coupled to the first power supply, a second input end coupled to the controller chip, and an output end coupled to the startup circuit;

wherein when the power button is pressed down, the controller chip outputs a control signal with a high potential to the second input end of the AND gate circuit, when there is a short-circuiting occurring between two adjacent pins of the slot, the electronic switch is turned on, the first input end of the AND gate circuit receives a low voltage, the output end of the AND gate circuit outputs a low voltage to the startup circuit, and the startup circuit cannot perform start-up action.

6. The motherboard of claim 5 , wherein when there is no short-circuiting occurs between two adjacent pins of the slot, the electronic switch is turned off, the first input end of the AND gate circuit receives a high voltage, the output end of the AND gate circuit outputs a high voltage to the startup circuit, and the startup circuit performs start-up action.

7. The motherboard of claim 5 , wherein the AND gate circuit comprises a first diode and a second diode, an anode of the second diode is coupled to a second power supply through a second resistor and as the output end of the AND gate circuit coupled to the startup circuit, a cathode of the first diode as a first input end of the AND gate circuit coupled to the first power supply, an anode of the second diode is coupled to the anode of the first diode, and a cathode of the second diode as the second input end of the AND gate circuit is coupled to the controller chip.

8. The motherboard of claim 5 , wherein the controller chip is a super I/O chip.

9. An electronic device comprising:
a chassis comprising a power button; and
a motherboard received in the chassis, comprising:
a slot mounted on the motherboard;
a controller chip;
a startup circuit coupling to the power button; and
a protecting circuit comprising:
an electronic switch comprising a first terminal coupled to the slot, a second terminal coupled to a ground, and a third terminal coupled to a first power supply through a first resistor; and
an AND gate circuit comprising a first input end coupled to the first power supply, a second input end coupled to the controller chip, and an output end coupled to the startup circuit;

wherein when the power button is pressed down, the controller chip outputs a control signal with a high voltage to the second input end of the AND gate circuit, when there is a short-circuiting occurring between two adjacent pins of the slot, the electronic switch is turned on, the first input end of the AND gate circuit receives a low voltage, the output end of the AND gate circuit outputs a low voltage to the startup circuit, and the startup circuit cannot perform start-up action.

10. The electronic device of claim 9 , wherein when there is no short-circuiting occurs between two adjacent pins of the slot, the electronic switch is turned off, the first input end of the AND gate circuit receives a high voltage, the output end of the AND gate circuit outputs a high voltage to the startup circuit, and the startup circuit performs start-up action.

11. The electronic device of claim 9 , wherein the AND gate circuit comprises a first diode and a second diode, an anode of the second diode is coupled to a second power supply through a second resistor and as the output end of the AND gate circuit coupled to the startup circuit, a cathode of the first diode as a first input end of the AND gate circuit coupled to the first power supply, an anode of the second diode is coupled to the anode of the first diode, and a cathode of the second diode as the second input end of the AND gate circuit is coupled to the controller chip.

12. The electronic device of claim 9 , wherein the controller chip is a super I/O chip.

Assignees

• Hong Fu Jin Prec Ind (Wuhan) Co Ltd
• Hon Hai Prec Ind Co Ltd

Inventors

• Ye Xin
• Chen Chun-Sheng

Classifications

• G06F1/26

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

• H02H11/005 Primary

  in case of too low isolation resistance, too high load, short-circuit; earth fault · CPC title

• G06F1/16

  Constructional details or arrangements · CPC title

• G06F11/0796

  Safety measures, i.e. ensuring safe condition in the event of error, e.g. for controlling element · CPC title