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PV Based Step-Up Coupled Inductor Cascade Boost DC-DC Converter With Lossless Passive Snubber For Application Of Motor Drive

A PV Based High Step-up Coupled-inductor Cascade Boost DC-DC Converter With Lossless Passive Snubber Is Fed Through DC Motor. Although A Conventional Cascade Boost Converter Has Larger Voltage Gain Compared To A Boost Converter, It Is Still Not Suitable For High Step-up Voltage Conversion. In The Proposed Converter, A Coupled Inductor Is Adopted For The Cascaded Boost Converter To Further Increase Voltage Gain. However, A Leakage Inductance Of The Coupled Inductor Causes A High Voltage Spike At A Main Switch. A Resistor-capacitor-diode (RCD) Snubber Is Commonly Used To Simply Solve This Problem, But It Is Also The Cause Of Additional Power Loss. Therefore, The Lossless Passive Snubber Is Suggested In Order To Prevent Efficiency Drop By A Snubber Circuit. In Conclusion, The Proposed Converter Has High Voltage Gain And Improved Power Efficiency.

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