一种准Z源升压型DC-DC变换器

摘要

For problems of traditional boost converter including limited boost ability and high capacitor voltage stress,a boost DC-DC converter was proposed which used two quasi-Z-source networks in cascade.Working process of the converter was analyzed,and expressions of step-up ratio and capacitor voltage stress were derived.Compared with traditional Z-source boost converter,the quasi-Z-source converter can realize larger step-up ratio with small duty cycle,and has lower capacitor voltage stress under the same step-up ratio.The simulation and experimental results verify validity of the theoretical analysis.%针对传统升压变换器存在升压能力有限、电容电压应力大等问题,提出了一种采用2个准Z源网络级联的升压型DC-DC变换器,分析了该变换器的工作原理,推导了该变换器升压比、电容电压应力的表达式.与传统Z源升压变换器相比,该变换器可在占空比小的情况下实现更大的升压比,且在升压比相同的情况下具有更小的电容电压应力.仿真和实验结果验证了理论分析的正确性.