Patent ID: 7502243

Claim:
An inverter for converting a DC voltage signal to an AC voltage signal, comprising: 1) a drive circuit providing a first drive signal and a second drive signal, the drive circuit having an input terminal for receiving an operating voltage signal; 2) a switch circuit generating a voltage signal at an output terminal, the switch circuit including a high-side transistor for receiving the first drive signal from the drive circuit ad a low-side transistor for receiving the second drive signal from the drive circuit, the high-side transistor and the low-side transistor being coupled in series between the DC voltage signal and ground, the high-side transistor having a gate-source voltage; 3) an auxiliary circuit adjusting the gate-source voltage of the high-side transistor, the auxiliary circuit being coupled to the drive circuit for providing the operating voltage and to the output terminal of the switch circuit for receiving the voltage signal, the auxiliary circuit comprises: a capacitor coupled between the input terminal of the drive circuit and the output terminal of the switch circuit; a diode having an anode and a cathode, the cathode of the diode being connected to the input terminal of the drive circuit; a resistor having a first end and a second end, the first end of the resistor receiving the DC voltage signal and the second end of the resistor being coupled to the anode of the diode; and an auxiliary winding having a first end and a second end, the first end of the auxiliary winding being coupled to the anode of the diode, the auxiliary winding having a second number of turns; and 4) a transformer circuit coupled to the switch circuit at the output terminal and being capable of transforming the voltage signal into the AC voltage signal, wherein the transformer circuit having a primary winding, a secondary winding, and a capacitance circuit, the primary winding having a first end and a second end, the primary winding further having a first number of turns, the secondary winding outputting the AC voltage signal.