A high voltage gain and high effieient DC-DC boost converter with ZVS and ZCS switching for samrt grid applications

Abstract

For module integrated PV systems, fuel cells, and other low voltage energy sources, a non-isolated, soft-switch integrated boost converter with a high voltage gain is suggested in this paper. A two-way booster converter is developed into this with a quadrupling resonant voltage cell to achieve a higher voltage gain. as an active clamping circuit, the auxiliary switch of the converter connected to the output port functions. The MOSFET switches are therefore activated with zero voltage switching. This auxiliary switch recycles coupled inductor leakage energy to the inverter output. All quadriplegic cell diodes with Zero Current Switching (ZCS) are turned off in the proposed converter. The high frequency transition and the reverse regeneration losses of the diodes are substantially reduced. ZCS diode switch-off also removes the diode voltage, due to the diode's parasite capacitance interaction and the coupling inductivity. Therefore, snubbers are not necessary to protect the diodes against the voltage spikes. All MOSFETs and diodes have lower voltage strain. It allows low voltage (low RDS(ON)) switches to be preferred and thus increases performance. The proposed converter is developed and mathematically evaluated. The converter is a 250-W prototype that validates the performance.

 Keywords - Zero voltage Switching (ZVS), Zero Current Switching (ZCS), High Voltage Gain, DC-DC converter.