基于z源网络的高增益低应力的直流变换器

Boost Converter With High Voltage Gain and Low Stress Based on Z-source Network

为升高光伏、燃料电池等的输出电压,提出一种基于Z源网络结构的高增益低应力的直流变换器。采用Z源网络增加泵升电容两端的电压,并通过电感和电容间的串联放电提升了电压增益,避免了变换器在极限占空比下工作。同时降低了开关管两端承受的电压应力,使电路效率得以提高。讨论了该变换器的拓扑结构、工作原理和稳态性能,并与其他变换器进行了性能对比分析,最后通过实验结果证明了理论分析的正确性。

In order to increase output voltage of photovoltaic and fuel ceils, boost converter with high voltage gain and low stress based on Z-source network is proposed.The voltage across pump capacitor is increased by adopting Z-source network, and by series discharging of inductors and capacitors, voltage gain of the proposed converter is improved,which avoids the converter operated at extreme duty cycle.Meanwhile,voltage stress on switches are decreased,the circuit efficiency is promoted.Topology structure,working principle and steady-state performance of the proposed converter are discussed.Moreover, performance comparison between various converters are presented.Finally, experimental results are provided to verify the correctness of the theoretical analysis.