A Non-isolated ZVZCS Resonant PWM DC-DC Converter for High Step-up and High Power Applications Author Jung,Byoung Kil Dept.of Control and Instrumentation Eng. Graduate School of Industry and Engineering Seoul National University of Science and Technology

Abstract
 A Non-isolated ZVZCS Resonant PWM DC-DC Converter for High Step-up and High Power Applications Jung,ByoungKil (SupervisorChoi,SeWan) Dept.of Control and Instrumentation Eng. Graduate School of Industry and Engineering Seoul National University of Science and Technology

 The demand of non-isolated high step-up DC-DC converters is gradually increasing in many applications such as dc back-up energy systems for UPS, photovoltaic and fuel cell systems and hybrid electric vehicles.This paper proposes non-isolated step-up DC-DC converters with an improved switching method.The proposed converter shows ZVS turn-on of the switches in CCM as well as reduced turn-off switching losses owing to the switching method that utilizes Lr-Cr resonance in the auxiliary circuit.Also,owing to the proposed switching method the switching losses associated with diode reverse recovery become negligible even in the small dutycycle.The capacitance in the auxiliary circuit is significantly reduced compared to PWM method.The duty cycle loss is further reduced resulting in increased step-up ratio. Experimental results from a 2kW prototype of two-phase interleaved version are also provided to validate the proposed concept.

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