A NOVEL HIGH EFFICIENCY CONVERTER FOR RENEWABLE ENERGY GENERATION APPLICATIONS

Abstract

Resonant converters are those, which has the L and C components that would provide a sinusoidal voltage or current wave during any sub interval in the switching interval. These wave form help in obtaining the Zero Voltage and Zero Current Switching to occur in the converters. The topology of the resonant converters uses the different combination of inductor and capacitors to obtain this property. The combination of this inductor and the capacitor is called the resonant tank. This project is to develop such a resonant converter, which utilizes the LLC resonant tank. This is a full bridge topology, which is a isolated topology in DC-DC converter topology. The isolation is happening because of the high frequency transformer placed between the inverter in the sourceside and the converter in the load side. The high frequency is obtained by switches of inverter in HF mode to supply to the source of the HF transformer. The multiphase converters are the main source that is used in the high performance point of load converters. This project uses the two-phase converter, which would split the current path into two in the source side. As the two currents join in the output capacitor the ripple at the output is reduced to half the value as the frequency of the ripple is doubled.The simulation work was carried out for both high efficiency LLC converter and full bridge converter of 14V input. Here, the efficiency of both the converters are calculated and was proved that efficiency of proposed system is higher than that of resonant converter of full bridge.