This article presents a bidirectional soft-switching push–pull resonant converter that is highly efficient over a wide range of battery voltages. It is derived by integrating a current-fed push–pull circuit and an active voltage doubler circuit with a bidirectional switch. The converter operates as a pulsewidth modulation (PWM) current-fed push–pull resonant-boost converter in the forward direction, but as a PWM half-bridge resonant converter in the backward direction. The most attractive feature of the proposed converter is that, by employing the bidirectional switch and corresponding switching modulation, it can achieve almost ZVS at turn- off instants under wide variations of battery voltages. Therefore, the proposed converter achieves high efficiency even during high-frequency operation. Moreover, no instantaneous reactive current flows through the circuit under wide variations of battery voltages and loads. Furthermore, the proposed bidirectional resonant converter has a high conversion ratio in both power flow directions without using a transformer that has high turns-ratio. The operating principles and characteristics of the proposed bidirectional resonant converter are presented in detail. Experimental results using a 1-kW prototype verified the feasibility and efficiency of the proposed converter.

中文翻译：

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在宽电池电压范围内的双向软开关推挽谐振转换器

本文介绍了一种双向软开关推挽谐振转换器，该转换器在很宽的电池电压范围内都非常高效。它是通过集成一个电流馈电推挽电路和一个带双向开关的有源倍压器电路而得到的。该转换器在正向上作为脉宽调制 (PWM) 电流馈电推挽谐振升压转换器运行，但在反向上作为 PWM 半桥谐振转换器运行。所提出的转换器最吸引人的特点是，通过采用双向开关和相应的开关调制，它可以在转向时实现几乎 ZVS - 在电池电压的广泛变化下瞬间关闭。因此，所提出的转换器即使在高频操作期间也能实现高效率。此外，在电池电压和负载变化很大的情况下，没有瞬时无功电流流过电路。此外，所提出的双向谐振转换器在两个功率流方向上都具有高转换比，而无需使用具有高匝数比的变压器。详细介绍了所提出的双向谐振转换器的工作原理和特性。使用 1 kW 原型的实验结果验证了所提出的转换器的可行性和效率。