This article presents an auxiliary circuit for the current-fed half-bridge (CFHB) converter, aiming to clamp the high voltage spikes across the main switches caused by the energy stored in the leakage inductance of the transformer. This circuit also provides zero-current switching (ZCS) to the main switches at turn-off. Moreover, the rectifier diodes and the auxiliary switch operates under ZCS at turn-on and turn-off. Another feature of the proposed circuit is that it is composed of just one active switch, reducing the number of auxiliary sources and drivers compared to the conventional active-clamped CFHB converter. In addition, the inclusion of the clamping circuit increases the voltage ratio of the converter. A 300-W prototype was built to validate the analysis and design proposed in this article. The converter was tested for various load conditions at 100 kHz, and a peak efficiency of 96.2% was obtained. Also, a comparison of efficiency for the CFHB employing other conventional clamping circuits is presented.

中文翻译：

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有源钳位零电流开关电流馈电半桥转换器

本文介绍了一种用于电流馈电半桥 (CFHB) 转换器的辅助电路，旨在钳制由存储在变压器漏电感中的能量引起的主开关上的高压尖峰。该电路还在关断时为主开关提供零电流开关 (ZCS)。此外，整流二极管和辅助开关在导通和关断时工作在 ZCS 下。所提出电路的另一个特点是它仅由一个有源开关组成，与传统的有源钳位 CFHB 转换器相比，减少了辅助电源和驱动器的数量。此外，钳位电路的加入增加了转换器的电压比。构建了一个 300-W 原型来验证本文中提出的分析和设计。该转换器在 100 kHz 的各种负载条件下进行了测试，获得了 96.2% 的峰值效率。此外，还介绍了使用其他传统钳位电路的 CFHB 的效率比较。