Patent ID: 7286373

Claim:
A full-resonant power circuit device for receiving a variable input voltage, comprising: a power factor corrector received the variable input voltage for boosting the variable input voltage into a supply voltage; a square wave generator coupled with the power factor corrector for producing a series of square wave voltages in response to the supply voltage; a primary resonance loop coupled with the square wave generator and composed of a serial capacitor, a first serial inductor and a second serial inductor, wherein the serial capacitor coupled with the first serial inductor and the first serial inductor coupled with the second serial inductor; a first switch coupled with the primary resonance loop; at least one secondary resonance loop coupled with the square wave generator and composed of the serial capacitor, the first serial inductor and at least one auxiliary serial inductor, wherein the serial capacitor coupled with the first serial inductor and the first serial inductor coupled with the auxiliary serial inductor; at least one second switch separately coupled with the secondary resonance loop; a rectifier circuit coupled with the primary resonance loop for outputting a direct current (DC) voltage in response to the series of square wave voltages; and a voltage detector for detecting the variable input voltage and separately controlling the first switch and the second switch in response to the variable input voltage.