In this paper, two cascaded buck-boost nature converters are developed; one converter is capable of producing high step-up gain, and the other converter addresses high step-down gain. In proposed converters, for a given voltage gain, two distinct duty ratios are possible due to their ability in handling complementary switching schemes. This feature is effective for voltage-sensitive applications like LED systems. The operation principle, steady-state analysis, and the design of the passive components for each switching scheme are presented for the proposed converters. Comparative analysis with competitive converters profound the merits of the proposed converters in terms of voltage gain and the continuous nature of the output. Experiments are conducted on both proposed converters for simultaneous and complementary switching schemes, and they validate the theoretical steady-state performance.

中文翻译：

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互补开关使能级联升压-降压-升压 (BS-BB) 和降压-升压-降压 (BB-BU) 转换器

在本文中，开发了两个级联升降压转换器；一个转换器能够产生高升压增益，而另一个转换器处理高降压增益。在提议的转换器中，对于给定的电压增益，由于它们能够处理互补开关方案，因此可能有两种不同的占空比。此功能对于 LED 系统等电压敏感应用非常有效。介绍了所提出的转换器的工作原理、稳态分析和每种开关方案的无源元件设计。与竞争转换器的比较分析深刻地揭示了所提出的转换器在电压增益和输出的连续性方面的优点。对同时和互补开关方案的两个提议的转换器进行了实验，