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A family of interleaved current-fed high step-up dc-dc converters areintroduced and analyzed here by combining a voltage multiplier (VM) and anactive clamp circuit for high-voltage high-power applications. Low inputcurrents and output voltages ripples values and high voltage-gainscharacteristics of these converters make them suitable for lots of dc-dcapplications. All power devices operate entirely under soft switchingconditions, even when wide load and input voltage variations are applied. Thus,they can be designed at high switching frequencies to reduce passive componentssizes to achieve high-power density, one of the main targets of the powerelectronics researches. Also, their input and output ports common groundsimplifies the gate-drives and control circuits. To verify the given analysesand simulations, a 120-320 V to 1 kV, 50-1300 W three-stage two-leg prototypeconverter has been implemented at 100 kHz. Based on the experimental results,maximum efficiency of 96.5% is achieved.

A Family of Interleaved High Step-Up DC-DC Converters by Integrating a Voltage Multiplier and an Active Clamp Circuits