Patent ID: 9391605
Filing Date: 2016-07-12
CPC Classification: H02J,H03K

Claim Text:
1. A discharge circuit, comprising: a power supply unit outputting a power good signal; a pulse width modulator chip comprising a control pin and a phase output pin, wherein the control pin is coupled to the power supply unit, to receive the power good signal; and first and second electronic switches each comprising first to third terminals, wherein the first terminal of the first electronic switch is coupled to the control pin, and is coupled to a first system power terminal through a first resistor, the second terminal of the first electronic switch is connected to ground, the third terminal of the first electronic switch is coupled to a stand-by power terminal through a second resistor; the third terminal of the first electronic switch is coupled to the first terminal of the second electronic switch; the second terminal of the second electronic switch is connected to ground, the third terminal of the third electronic switch is coupled to the phase output pin through a third resistor; wherein when the first terminals of the first and second electronic switches are at low-voltage level, the first and second electronic switches are turned on; when the first terminals of the first and second electronic switches, the first and second electronic switch are turned off.