A Quintupler Boost High Conversion Gain Soft-Switched Converter for DC Microgrid

Abstract

This study proposes a high conversion gain soft-switching quintupler boost non-isolated converter for DC microgrid. By inclusion of quintupler rectifier and coupled inductor with reduced duty cycle, high voltage gain is obtained. The leakage energy of coupled inductor is recycled through an auxiliary switch and the output capacitor improves further boost. Due to the active clamp and this recycled leakage energy, huge inductive voltage spikes across MOSFETs are alleviated and also, stress is reduced. Hence, low voltage rating (low <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$R_{ds(ON)}$ </tex-math></inline-formula> ) switches can be utilized and minimize conduction losses. In addition, this clamp enables zero-voltage switching (ZVS) for both the MOSFETs, even at light loads. Quintupler multiplier rectifier reduces the voltage stress across diodes. This, in turn, reduces reverse recovery losses for multiplier diodes. Further, the coupled inductor leakage inductance in series with diodes provides for the snubbing effect to alleviate voltage spikes across quintupler diodes. Thus, the overall diode voltage rating reduces. This improves power density and improves the overall efficiency of the converter. Finally, a 400W prototype operates at 100kHz is developed to validate the converter performance. The measured peak efficiency is 96.43%.