Patent ID: 8198882

Claim:
A power converting device for converting a DC voltage input from an external power source into an AC voltage output, comprising: a coupling circuit including first and second windings each having a polarity end and a non-polarity end, said polarity end of said first winding being coupled to said non-polarity end of said second winding; a rectifying diode having a grounded anode, and a cathode coupled to said polarity end of said second winding; a clamp diode having a grounded anode, and a cathode coupled to said polarity end of said first winding; a clamp switch adapted to be coupled between the external power source and said cathode of said clamp diode, and operable between an ON-state and an OFF-state; a full-bridge circuit including a first series connection of first and second switches, and a second series connection of third and fourth switches, said first and second series connections being coupled in parallel between said non-polarity end of said first winding and ground, each of said first, second, third and fourth switches being operable between an ON-state and an OFF-state; and an output circuit including an output capacitor coupled between a first common node between said first and second switches, and a second common node between said third and fourth switches, the AC voltage output being a voltage across said output capacitor; wherein said first switch is coupled to said third switch, and said second switch is coupled to said fourth switch, said first and fourth switches are simultaneously in the ON-state, and said second and third switches are simultaneously in the ON-state, and when said first switch is in the ON-state, said second switch is in the OFF-state; wherein when said first and fourth switches are in the ON-state, said output capacitor is charged so that the AC voltage output is a positive half of a sinusoidal signal, and when said second and third switches are in the ON-state, said output capacitor is reversely charged so that the AC voltage output is a negative half of the sinusoidal signal; and wherein said output circuit further includes an output inductor coupled in parallel to said output capacitor and capable of drawing out energy attributed to said output capacitor during crossover between the positive and negative halves of the sinusoidal signal.