Adding redundant converters or switches are two common strategies to achieve fault-tolerant operation of converters. The former one is straightforward but costly, while the latter one is cost-effective but with sacrifice on the reliability as it only works for switches’ failure. Aiming to achieve a good trade-off between cost and reliability, a novel fault-tolerant full-bridge series-resonant converter (FB-SRC) which only needs a redundant half-bridge SRC (HB-SRC) to gain fault tolerance for all fault-prone components is proposed in this article. The proposed converter can keep working normally when short-circuit fault or open-circuit fault happens on switches, diodes, or the output filter capacitor. After fault occurs, the redundant HB-SRC converter will combine the remaining healthy part of original FB-SRC to reconstruct an input-parallel and output-series dual HB-SRC, which can maintain the rated output power with reduced cost. In the article, component's reliability of SRC is first analyzed. Then, operation and performance analysis of the proposed fault-tolerant converter is introduced in detail. As the voltage/current stresses of components are almost the same during the prefault and postfault operation, the converter design is simple. Finally, experimental results of a 500 W prototype are also given to verify the effectiveness.

中文翻译：

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一种成本与可靠性权衡的冗余与重构容错串联谐振变换器


添加冗余转换器或开关是实现转换器容错运行的两种常见策略。前一种方法简单，但成本较高，而后一种方法虽然经济有效，但只适用于交换机故障，因此牺牲了可靠性。为了在成本和可靠性之间实现良好的权衡，一种新型容错全桥串联谐振转换器（FB-SRC）只需要一个冗余半桥SRC（HB-SRC）即可获得所有容错能力本文提出了容易出现故障的组件。当开关、二极管或输出滤波电容器发生短路故障或开路故障时，所提出的转换器可以保持正常工作。故障发生后，冗余HB-SRC转换器将结合原FB-SRC剩余的健康部分重构输入并联输出串联的双HB-SRC，可以在降低成本的情况下维持额定输出功率。文中首先对SRC器件的可靠性进行了分析。然后，详细介绍了所提出的容错转换器的运行和性能分析。由于故障前和故障后运行期间组件的电压/电流应力几乎相同，因此转换器设计很简单。最后还给出了500 W样机的实验结果来验证有效性。