Patent ID: 8350838
Filing Date: 2013-01-08
Classification: G09G

Abstract:
1. A power supply circuit, comprising: an output terminal configured for providing electric power to a load circuit; a direct current (DC) power supply; a first resistor; a first switch comprising a first switch control electrode grounded via the first resistor, a first switch first current conducting electrode connected to the DC power supply, and a first switch second current conducting electrode connected to the output terminal; a second switch comprising a second switch control electrode connected to the output terminal, a second switch first current conducting electrode connected to the DC power supply, and a second switch second current conducting electrode connected to the control electrode of the first switch; a second resistor interconnected the first switch first current conducting electrode and the first switch second current conducting electrode; a control signal input terminal configured for receiving control signals; a third resistor; a third switch comprising a third switch control electrode connected to the control signal input terminal, a third switch first current conducting electrode being grounded, a third switch second current conducting electrode connected to the first switch control electrode via the first resistor, and connected to the DC power supply via the first resistor and the third resistor in turn; a discharge circuit comprising: a sixth resistor interconnected the power supply and the control signal input terminal; a seventh resistor, interconnected the control signal input terminal and the third switch control electrode; and a protective capacitor comprising a protective capacitor first terminal being grounded, and a protective capacitor second terminal connected to the third switch control electrode.