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A Three-Phase Zero-Voltage and Zero-Current Switching DC–DC Converter for Fuel Cell Applications

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3 Author(s)
Hyungjoon Kim ; POSCON Co., Ltd., Pohang, South Korea ; Changwoo Yoon ; Sewan Choi

In spite of having many advantages, such as low switch voltage and easy implementation, the voltage-fed dc-dc converter has been suffering from problems associated with large transformer leakage inductance due to high transformer turn ratio when it is applied to low-voltage, high-current step-up application such as fuel cells. This paper proposes a new three-phase voltage-fed dc-dc converter, which is suitable for low-voltage, high-current applications. The transformer turn ratio is reduced to half owing to ??-Y connection. The zero-voltage and zero-current switching (ZVZCS) for all switches are achieved over wide load range without affecting effective duty cycle. A clamp circuit not only clamps the surge voltage but also reduces the circulation current flowing in the high-current side, resulting in significantly reduced conduction losses. The duty cycle loss can also be compensated by operation of the clamp switch. Experimental waveforms from a 1.5 kW prototype are provided.

Published in:

Power Electronics, IEEE Transactions on  (Volume:25 ,  Issue: 2 )

Date of Publication:

Feb. 2010

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