双耦合电感二次型高升压增益DC-DC变换器

High Voltage Gain DC-DC Converter Based on Two-Coupled-Inductor

提出一种双耦合电感单开关二次型高增益变换器。在传统单开关二次型Boost变换器拓扑的基础上,在前级Boost电路单元引入耦合电感,输出端叠加以提升变换器的升压增益特性;同时,通过在后级Boost电路单元引入耦合电感,进一步减小开关管的电压应力。此外,采用无源无损吸收电路抑制了开关管两端的电压尖峰,从而可选取低导通电阻、低电压等级的MOSFET以降低开关管的导通损耗,提高了变换器的效率。文中详细分析了变换器的工作原理及工作特性,最后通过搭建一台200W、18V/200V的实验样机,验证了理论分析的正确性。

High voltage gain non-isolated DC-DC converter with two-coupled-inductor is presented in this paper. Based on single switch quadratic boost topology, by incorporating coupled-inductor cell into pre-stage boost cell and stacking the output voltage, the proposed converter can achieve high voltage gain property. Meanwhile, by introducing coupled-inductor cell into post-stage boost cell, voltage stress of power switch is decreased. Furthermore, passive snubber is utilized to suppress voltage spike stress of the switch and low-voltage-rated MOSFET with low RDS(on) for reduction of the conduction loss and cost can be chosen, therefore efficiency of the converter improved. Finally, Steady state analysis of the converter and operating characteristics is developed and experimental results from a 200 W 20V/200 V prototype were presented to verify the analysis of the proposed converter.