Patent ID: 7242597
Filing Date: 2007-07-10
Classification: A61N,H02M,Y10S

Abstract:
1. A rectifier circuit for converting AC voltage to DC voltage, comprising: a first MOS transistor having a source connected to a first input terminal of an AC power supply and a drain connected to an output terminal; a first parasitic diode formed between the first input terminal and the output terminal; a first detection circuit, connected to the first input terminal and to the output terminal, for detecting a difference in voltage between the first input terminal and the output terminal; a second MOS transistor having a source connected to a second input terminal of the AC power supply and a drain connected to a ground terminal, the second MOS transistor having polarity opposite to the first MOS transistor; a second parasitic diode formed between the input terminal and the ground terminal; a second detection circuit, connected to the second input terminal and the ground terminal, for detecting a difference in voltage between the second input terminal and the ground terminal; and a capacitor connected to the output terminal and the ground terminal, wherein the first detection circuit turns on/off the first MOS transistor according to the difference in voltage detected by the first detection circuit, and wherein the second detection circuit turns on/off the second MOS transistor according to the difference in voltage detected by the second detection circuit.