基于二极管-电容倍压单元的DC-DC升压变换器

DC-DC Boost Converter Based on Diode-capacitor Doubler Unit

基于二极管-电容倍压单元,提出了一种新型高增益升压变换器。该拓扑在实现高增益的同时可以避免使用极大的占空比,并且可有效地降低开关管和二极管的电压应力。分析了变换器的工作原理,推导了变换器工作在连续导电模式CCM(continuous conduction mode)和断续导电模式DCM(discontinuous conduction mode)下的电压增益、开关器件的电压应力和电感电流纹波。与传统的Boost变换器相比,CCM状态下所提变换器的电压增益是其(5-D)倍,电感电流纹波近似减小为原来的一半。最后通过仿真与样机实验,验证了理论分析的正确性,表明提出的变换器具有良好的综合性能。

Based on a diode-capacitor doubler unit,a novel type of high-gain Boost converter is proposed in this paper,which can achieve a high gain while avoiding the use of extremely large duty cycles and effectively reducing the voltage stress on the switching tubes and diodes.The working principle of this converter is analyzed,and the voltage gain of the converter in continuous conduction mode(CCM)and discontinuous conduction mode(DCM),the voltage stress on switching devices,and the inductor current ripple are deduced.It is found that the voltage gain of the novel converter in CCM is(5-D)times that of the traditional Boost converter,while its inductor current ripple is approximately reduced by half.Finally,the theoretical analysis was verified by simulations and prototype experiments,showing that the proposed converter has a satisfying comprehensive performance.