ABSTRACT In this paper, a new soft switching bidirectional DC-DC converter with high conversion ratio is proposed. In the proposed converter, soft switching condition is provided with only one auxiliary switch for both directions, which simplifies the structure of the converter. The switching in boost mode is under ZCS condition and in buck mode is under ZVS condition. In the proposed converter, all diodes turn off under ZCS condition; therefore, losses related to diodes reverse recovery are eliminated. The control of the auxiliary switch is complementary to the main switch; thus, complex control circuit is not required. The voltage stress of the switch in boost mode is reduced extremely due to high voltage gain. The proposed converter is analysed, and to confirm the theoretical analysis, a 200-W prototype is implemented and the results are presented. Consequently, the efficiency of the proposed converter at full load is 97.5%.

中文翻译：

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一种新型高转换比非隔离软开关DC-DC双向转换器

摘要 在本文中，提出了一种具有高转换比的新型软开关双向 DC-DC 转换器。在所提出的变换器中，软开关条件只提供一个双向辅助开关，简化了变换器的结构。升压模式下的开关处于 ZCS 条件下，降压模式下的开关处于 ZVS 条件下。在建议的转换器中，所有二极管在 ZCS 条件下关闭；因此，消除了与二极管反向恢复相关的损耗。辅助开关的控制与主开关互补；因此，不需要复杂的控制电路。由于高电压增益，升压模式下开关的电压应力大大降低。对建议的转换器进行分析，并确认理论分析，实现了 200-W 原型并展示了结果。因此，建议的转换器在满载时的效率为 97.5%。