Patent ID: 7548028

Claim:
A current-mode resonant inverter circuit comprising: a step-up transformer; and a secondary side circuit connected to a secondary winding of the step-up transformer, the secondary side circuit comprising a capacitive component, a resonant circuit being formed as a result of a leakage inductance of the step-up transformer secondary winding and the capacitive component in the secondary side circuit, wherein: one end of a primary winding of the step-up transformer is connected to a power source side; the other end of the primary winding is connected to a switched snubber circuit through a primary winding of a current transformer; and the switched-snubber circuit includes a pair of transistors different from each other in polarity, the bases or gates of the pair of transistors being connected to each other, the pair of transistors are connected to a secondary winding of the current transformer; one collector of the pair of transistors is connected to the primary winding of the current transformer, and the other collector of the pair of transistors is connected to the current transformer primary winding through a capacitor.