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基于Switch-Capacitor网络实现分时供电的多输入升压变换器

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Keywords: Switch-Capacitor网络,升压比,电压应力,纹波,元器件利用率

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Abstract:

在新能源联合发电系统中,多输入直流变换器可分时或同时向负载提供能量,具有简化系统结构、降低系统成本等优点。然而,现有的多输入直流变换器不能很好地满足新能源发电领域对高升压比、低纹波、低开关应力等技术参数的要求。因此,本文基于Switch-Capacitor网络串联放电、并联充电和多个网络累加升压的工作特性,推导出一种新型多输入升压变换器。本文以三输入升压变换器为例,详细分析了其在连续工作模式下的工作原理和工作性能,进行了仿真分析,并搭建了实验模型,仿真分析与实验研究的结果表明①升压能力强,其升压比与Switch-Capacitor网络组中的网络个数有关；②开关器件的电压应力、输入电流纹波和输出电压纹波小；③所有开关管由同一控制信号隔离驱动,控制电路简单；④实现分时供电,元器件利用率高；⑤推演出对应的同时供电多输入升压变换器。

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