Enhancing the voltage gain of flyback using leakage energy

This paper presents a technique of series injection of auxiliary source to boost the effective input voltage of flyback converter, which increases voltage gain and reduces flyback inductor current, resulting in improved power density. Two such circuits, developing the auxiliary source by the magnetic energy trapped in the clamping circuits, are designed. Hence, the clamped energy is recycled by feeding it back to the inductor during its energizing period. The operation and analysis of these circuits are verified by experiment and simulation, both.