High Step-Up DC-DC Converter With Active Soft-Switching and Voltage-Clamping for Renewable Energy Systems
High Step-Up DC-DC Converter With Active Soft-Switching and Voltage-Clamping for Renewable Energy Systems
复制标题
适用于可再生能源系统的具有有源软开关和电压钳位的高升压 DC-DC 转换器
DOI：
10.1109/tpel.2018.2789456
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发表时间：
2018
影响因子：
6.7
通讯作者：
Guo Dong
中科院分区：
文献类型：
--
作者：
He Liangzong;Zheng Zhipeng;Guo Dong
本文提出了一种具有耦合电感器和开关电容器的新型高升压DC-DC变换器，该变换器广泛应用于可再生能源系统中，作为低压源的前端级。开关电容器和耦合电感器的组合使用可以在没有极端占空比的情况下实现高电压增益，从而降低功率开关上的电压应力。因此，可以采用低电阻RDS（ON）的MOSFET作为主开关，以减少传导损耗。同时，由于耦合电感的漏感，电流下降速率变得可控，并且缓解了输出二极管的反向恢复问题。重要的是，通过采用有源钳位电路，不仅可以抑制漏感引起的电压尖峰，而且还可以获得主开关管和辅助开关管的零电压开关。特别地，钳位电路还起到能量转移的作用，以提高增益。最后，实现了额定功率为 500 W 的原型来验证所提出的转换器的性能。
A novel high step-up dc-dc converter with a coupled inductor and a switched capacitor is proposed in this paper, which is widely used in the renewable energy system as the front-end stage for low voltage sources. The combinational employment of the switched capacitor and the coupled inductor makes high voltage gain achievable without extreme duty cycle, resulting in reduced voltage stress on power switches. Hence, MOSFETs with low resistance RDS (ON) could be utilized as the main switch to reduce conduction loss. Meanwhile, due to the leakage inductance of the coupled inductor, the current falling rate becomes controllable, and the reverse-recovery problem of the output diode is alleviated. Importantly, by incorporating an active clamped-circuit, not only are voltage spikes caused by leakage inductance restrained, but also zero-voltage switching could be obtained for the main and auxiliary switches. Specially, the clamped circuit plays a role of energy transfer to boost the gain as well. Finally, a prototype with a power rating of 500 W is implemented to verify the performance of the proposed converter.