A High Gain Highly Efficient and compact Flyback Converter with a Passive Clamp Circuit

摘要

A highly efficient Flyback converter with a passive clamp circuitry has been proposed in this paper. The unwanted leakage energy of the transformer is managed by the passive clamp circuitry consisting of a diode and a capacitor and transferred to the output side electrically. We know that the Flyback converter power rating is limited due to its magnetic. In the case of the proposed converter, one portion of the total load power is sent from the input source. Another portion is sent to the load through the passive clamp circuit itself. Hence, the Flyback transformer handles lesser power than the total output power requirement. The voltage rating of the power electronic devices is less for the proposed topology. High voltage spikes do not appear across the switch. These features result in high efficiency of power conversion. The modes of operation of the proposed converter have been found out and the differential equations governing various states has been derived and solved. Plots of the variation of the efficiency and the gain of the converter have been obtained after detailed steady state analysis. The explanations of the performance of the converter are verified through the simulations in Matlab-Simulink.