Aiming at the problems of low output voltage and large input current ripple of DC/DC converter in pho-tovoltaic power generation,fuel cell and other new energy power generation systems,an improved Sepic based zero-ripple high-gain DC converter is proposed.The converter coupled the original two inductors of the improved Sepic converter.Through the structural design,the coupling inductor and CD(capacitor,diode)booster structure were com-bined to achieve high output voltage gain.At the same time,the capacitor clamp technology and input inductance were used to achieve zero ripple input current.It not only improves the power generation efficiency of the new energy power generation system but also solves the problem of low grid power of the new energy power generation sys-tem.The working principle of the proposed converter,the characteristics of input current ripple,voltage gain and the stress characteristics of the switching device are analyzed in detail,and the key parameters are designed.Finally,an 100W,36/360V prototype is built to verify the feasibility of the design scheme.
关键词
零纹波/高增益/新能源发电/Sepic/直流变换器/耦合电感
Key words
zero ripple/high gain/new energy generation/SEPIC/DC/DC converter/coupling inductance
维普
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