An Efficient Soft-Switching Buck Converter With Parasitic Resonance Suppression in Auxiliary Circuit
An Efficient Soft-Switching Buck Converter With Parasitic Resonance Suppression in Auxiliary Circuit
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DOI：
10.1109/tie.2022.3156170
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发表时间：
2023
影响因子：
7.7
通讯作者：
Jianghu Wan;Fang Liu;Kang Liu;Yong Li
中科院分区：
文献类型：
--
作者：
Jianghu Wan;Fang Liu;Kang Liu;Yong Li
本文提出了一种新型高效软开关同步整流（SR）降压转换器，所有开关和二极管都没有电压应力增量。通过在SR降压变换器中引入辅助电路,实现了功率半导体器件在宽负载功率范围内的软开关条件。辅助网络由电容器、电感器、开关和三个二极管组成，为主开关和SR开关在导通和关断瞬间提供零电压条件。此外，辅助电感为辅助开关提供零电流开通和零电压关断条件。考虑到半导体元件的寄生电容与辅助电感之间的谐振，设计了两个二极管以避免功率器件上的额外电压应力。分析了该转换器的工作原理。采用 600 W 原型来测试软开关操作。与传统 SR 降压转换器相比，在宽负载功率范围内的效率曲线证明了所提出转换器的优点。
In this article, a new efficient soft-switching synchronous rectification (SR) buck converter is proposed, which is without voltage stress increment for all switches and diodes. By introducing an auxiliary circuit to the SR buck converter,the soft-switching condition is achieved within the wide range of load power for the power semiconductor devices. The auxiliary network, which consists of capacitor, inductor, switch, and three diodes, provides a zero-voltage condition for main switch and SR switch at both the turn-on and the turn-off instant. Besides, the auxiliary inductor creates a zero-current turn-on and a zero-voltage turn-off condition for the auxiliary switch. Considering the resonance between the parasitic capacitors of the semiconductor components and the auxiliary inductor, two diodes are designed to avoid the additional voltage stress on power devices. The operating principle of this proposed converter is analyzed. A 600 W prototype is implemented to test the soft-switching operation. The advantage of the proposed converter is demonstrated by the efficiency curve over a wide range of load power against the conventional SR buck converter .