For fuel cell applications, a module-integrated dc/dc converter with the isolation capability is an important part of a power distribution system. It increases the low input voltage of a fuel cell to a desire high voltage and behaves as an interface connection circuit. There are several isolated dc/dc converters for connecting a fuel cell module to a power load. Among them, Flyback converter is a good candidate and widely used for fuel cell applications, due to its simple structure; however, the internal dynamics of a Flyback converter involves a right-half-plane zero (RHPZ), resulting in its performance degradation. Hence, the open-loop gain margin of a Flyback converter is small and its open-loop phase margin is negative, leading to difficulties for development of a voltage-mode controller. The major objective of the article is to address the aforementioned problems and present a new approach for eliminating them. To this end, a modified Flyback topology with ability of the RHPZ elimination is suggested and analyzed in this study and also, the superior performance of the modified converter is demonstrated in comparison with a classical Flyback converter. Then, the dynamical model of the designed circuit is derived using the averaging method and the design rules are determined. In addition, the theoretical model of the developed converter is validated via simulations and experiments. To keep the load voltage of this topology at a fixed value and, show its good performance for industrial applications, the type-II/III controllers are designed and the obtained simulated and practical results are introduced.

对于燃料电池应用，具有隔离功能的模块集成 DC/DC 转换器是配电系统的重要组成部分。它将燃料电池的低输入电压提高到所需的高电压，并起到接口连接电路的作用。有几个隔离的 DC/DC 转换器用于将燃料电池模块连接到电源负载。其中，反激式转换器是一个很好的候选者，由于其结构简单，被广泛用于燃料电池应用；然而，反激式转换器的内部动态涉及右半平面零 (RHPZ)，导致其性能下降。因此，反激式转换器的开环增益裕度小，开环相位裕度为负，给电压模式控制器的开发带来困难。本文的主要目的是解决上述问题，并提出一种消除这些问题的新方法。为此，本研究提出并分析了具有 RHPZ 消除能力的改进型反激式拓扑结构，并与经典的反激式转换器相比，证明了改进型转换器的优越性能。然后，采用平均法推导出所设计电路的动力学模型，并确定设计规则。此外，开发的转换器的理论模型通过模拟和实验得到验证。为了使该拓扑的负载电压保持在固定值，并在工业应用中展示其良好的性能，设计了II/III型控制器，并介绍了所获得的仿真和实际结果。