A Three-Phase Zero-Voltage and Zero-Current Switching DC–DC Converter for Fuel Cell Applications
A Three-Phase Zero-Voltage and Zero-Current Switching DC–DC Converter for Fuel Cell Applications
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DOI：
10.1109/tpel.2009.2026418
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发表时间：
2010-02
影响因子：
6.7
通讯作者：
Hyungjoon Kim;C. Yoon;Sewan Choi
中科院分区：
文献类型：
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作者：
Hyungjoon Kim;C. Yoon;Sewan Choi
尽管电压型DC-DC变换器具有开关电压低、易于实现等优点，但当其应用于燃料电池等低压大电流升压场合时，由于Transformer匝数比大，存在着Transformer漏电感大的问题。本文提出一种适用于低压大电流应用之三相电压型直流-直流转换器。由于采用<$-Y连接，变压器匝数比减半。在不影响有效占空比的情况下，实现了开关管的零电压零电流开关。箝位电路不仅对浪涌电压进行箝位，而且还减少了在高电流侧流动的环流，从而显著降低了传导损耗。占空比损失也可以通过箝位开关的操作来补偿。从1.5千瓦的原型实验波形提供。
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.