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This paper proposes a transformerless single-phase single-stage high step-up ac-dc converter based on symmetrical Cockcroft-Walton voltage multiplier (CW-VM) with only adding two bidirectional switches and two boost inductors. With the help of the boost structure, not only the voltage gain can be higher than that of the conventional symmetrical CW-VM but also the power factor correction (PFC) methods...
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