A high switching frequency isolated voltage-fed dual-transformer-based hybrid semidual active bridge converter is introduced in this article for unidirectional power flow and wide voltage range applications. The converter embraces the full-bridge and half-bridge properties under varying operating conditions to improve efficiency. Five appropriate working patterns are elaborated, including ideal output power derivation, current stress analysis, working voltage matching, output power distribution, and soft switching features. Afterward, a simple segmented control strategy is adopted in accordance with the analysis results. The zero voltage switching of all switches is achieved by introducing the magnetic current and suitable drive logic. Compared with the existing works, the proposed converter has outstanding merits in terms of reduced conduction loss, switching loss, and peak current of ac inductor, resulting in high conversion efficiency. Hence, the converter is more suitable for cases with wide and frequent input voltage variations. Eventually, the effectiveness of the converter and the control strategy is verified by a 1.0-kW prototype.

中文翻译：

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基于双变压器的混合半双有源桥式转换器，适用于采用简单分段控制的宽电压范围应用


本文介绍了一种基于高开关频率隔离电压馈电双变压器的混合半双有源桥式变换器，用于单向功率流和宽电压范围应用。该转换器在不同的工作条件下具有全桥和半桥特性，以提高效率。详细阐述了五种适当的工作模式，包括理想输出功率推导、电流应力分析、工作电压匹配、输出功率分配和软开关特性。然后根据分析结果采用简单的分段控制策略。所有开关的零电压切换是通过引入磁电流和合适的驱动逻辑来实现的。与现有的工作相比，所提出的转换器在降低传导损耗、开关损耗和交流电感器的峰值电流方面具有突出的优点，从而具有高转换效率。因此，该转换器更适合输入电压变化较大且频繁的情况。最终，转换器和控制策略的有效性通过1.0kW样机得到验证。