Discharge circuit for power supply unit

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