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基于耦合电感倍压单元的零输入电流纹波高增益非隔离变换器

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Keywords: 零纹波变换器,高增益,耦合电感倍压单元,无源无损吸收电路

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Abstract:

提出一种基于耦合电感倍压单元的零输入电流纹波非隔离型高增益DC-DC变换器。该变换器由零输入电流纹波Boost变换器和耦合电感单元组成,通过设计耦合电感电压比,实现了高升压增益特性。同时,采用无源无损吸收电路消除了漏感引起的开关管两端电压尖峰,降低了开关管的电压应力。通过增加由电容和二极管组成的倍压单元,进一步减小了开关管的电压应力,同时消除了输出二极管的电压尖峰,降低了二极管电压应力。因此,可通过选取低导通电阻、低电压等级的MOSFET,以降低变换器成本和开关管的导通损耗,提高变换器的效率。此外,还实现了变换器的零输入电流纹波,降低了输入滤波器的设计难度。文中详细分析了该变换器的工作原理及工作特性,给出了关键参数的设计原则。最后,通过实验结果验证了理论分析的正确性。

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