Novel Isolated High-Step-Up DC–DC Converter With Voltage Lift
Novel Isolated High-Step-Up DC–DC Converter With Voltage Lift
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DOI：
10.1109/tie.2011.2177789
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发表时间：
2013
影响因子：
7.7
通讯作者：
T. Liang;Jian-Hsieng Lee;Shih-Ming Chen;Jiann-Fuh Chen;Lung-Sheng Yang
中科院分区：
文献类型：
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作者：
T. Liang;Jian-Hsieng Lee;Shih-Ming Chen;Jiann-Fuh Chen;Lung-Sheng Yang
本文提出了一种新型的带电压提升的双开关高升压隔离变换器。所提出的隔离转换器利用低匝数比的变压器来实现高升压增益。次级绕组在导通期间对两个并联的升压电容器作为开关进行充电，在关断期间对两个升压电容器串联进行放电。因此，转换器具有高电压增益和适当的占空比。另外，通过在原边使用两个钳位二极管和一个电容器，回收泄漏能量，钳位两个有源开关的电压尖峰，从而提高转换效率。最后，基于实验室实现的输入电压为24 V、输出电压为200 V、输出功率为200 W的原型的实验结果验证了所提出的隔离转换器的性能；满载效率接近93%。
A novel two-switch high-step-up isolated converter with voltage lift is proposed in this paper. The proposed isolated converter utilizes a transformer with low turn ratio to achieve high step-up gain. The secondary winding charges two boosting capacitors in parallel as switches during the switch-on period, and two boosting capacitors are discharged in series during the switch-off period. Thus, the converter has high voltage gain with appropriate duty ratio. In addition, by using two clamping diodes and a capacitor on the primary side, leakage energy is recycled, and the voltage spikes of the two active switches are clamped, thereby improving conversion efficiency. Finally, experimental results based on a prototype implemented in the laboratory with an input voltage of 24 V, an output voltage of 200 V, and an output power of 200 W verify the performance of the proposed isolated converter; full-load efficiency is nearly 93%.