Patent ID: 7382113

Claim:
A high efficiency high voltage gain bi-directional converter, comprising: a low voltage circuit including a low voltage switch and first winding of a coupled inductor; depending on the switch's on and off state, storing or releasing energy in the first winding of the coupled inductor; a median voltage circuit including second winding of the coupled inductor and a median voltage capacitor between the low voltage circuit and a high voltage circuit, mainly utilizing the median voltage capacitor to raise voltage boosting ratio or bear part of voltage during step down; a clamping circuit including a clamping inductor, a clamping capacitor, a first clamping diode, a second clamping diode and a third clamping diode, mainly to absorb leakage induction energy of the coupled inductor, protect the low voltage switch and release the absorbed energy to output end; the high voltage circuit including a high voltage switch, providing a passage for bi-directional energy transfer between the high voltage circuit and the low voltage circuit.