US 9,866,015 B2Granted

Discharge circuit and motherboard utilizing the same

AssigneesHong Fu Jin Precision Industry (Wuhan) Co., Ltd., Hon Hai Precision Industry Co., Ltd.

InventorsKai-Long Huang, Chun-Sheng Chen

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Abstract

A discharge circuit applied in a motherboard includes a platform controller hub (PCH), a first electronic switch, a second electronic switch, and first capacitor. A control terminal of the first electronic switch is coupled to a standby pin of the PCH. A second terminal of the first electronic switch is coupled to the standby power. A control terminal of the second electronic switch is coupled to the second terminal of the first electronic switch. A second terminal of the second electronic switch is coupled to a first power source through a resistor coupled with a capacitor in parallel. The standby pin of the PCH outputs a digital low signal, to control the first electronic switch is turned off rapidly, and the second electronic switch is turned on. A voltage of the first power source is discharged through the resistor rapidly.

Claims16

Dependent claims

A discharge circuit comprising:

a platform controller hub (PCH) comprising a standby pin;
a first control unit comprising a first resistor and a first electronic switch, wherein a control terminal of the first electronic switch is coupled to the standby pin of the PCH, a first terminal of the first electronic switch is coupled to ground, a second terminal of the first electronic switch is coupled to a standby power source through the first resistor;
a second control unit comprising a second resistor, a first capacitor, and a second electronic switch, wherein a control terminal of the second electronic switch is coupled to the second terminal of the first electronic switch, a first terminal of the second electronic switch is coupled to ground, a second terminal of the second electronic switch is coupled to a first voltage terminal, the first capacitor is coupled to the second resistor in parallel;
wherein when the standby pin of the PCH outputs a low level signal to control the first electronic switch to turn off and control the second electronic switch to turn on, the first voltage terminal discharges through the second resistor.

1 more element

A motherboard comprising a discharge circuit, the discharge circuit comprising:

a platform controller hub (PCH) comprising a standby pin;
a first control unit comprising a first resistor, and a first electronic switch, wherein a control terminal of the first electronic switch is coupled to the standby pin of the PCH, a first terminal of the first electronic switch is coupled to ground, a second terminal of the first electronic switch is coupled to a standby power source through the first resistor;
and
a second control unit comprising a second resistor, a first capacitor, and a second electronic switch, wherein a control terminal of the second electronic switch is coupled to the second terminal of the first electronic switch, a first terminal of the second electronic switch is coupled to ground, a second terminal of the second electronic switch is coupled to a first voltage terminal, the first capacitor is coupled to the second resistor in parallel;
wherein when the standby pin of the PCH outputs a low level signal to control the first electronic switch to turn off and control the second electronic switch to turn on, the first voltage terminal discharges through the second resistor.

2 more elements

Dependencies are inferred from the claim text.