Patent ID: 7994758
Filing Date: 2011-08-09
Classification: H02M,Y02B

Abstract:
1. A power supply device comprising: a driver circuit having first, second, and third terminals, and a fourth terminal connected to a first voltage reference, the driver circuit configured to provide a stable driving signal and a floating driving signal; a transistor switch having a first terminal coupled to an input voltage, a second terminal connected to the first terminal of the driver circuit, and a third terminal connected to the second terminal of the driver circuit, the transistor switch configured to prevent a reverse current based on the floating driving signal; and a first transistor having a first current electrode connected to the first terminal of the transistor switch, a second current electrode connected to the first voltage reference, and a control electrode connected to the third terminal of the driver circuit, the first transistor configured to activate and deactivate based on the stable driving signal, and further configured to regulate the input voltage to a substantially constant direct current output voltage, wherein the transistor switch further comprises: