Aiming at the problem of low output voltage level and poor stability of photovoltaic,a high-gain coupled inductor combination Boost-Sepic converter was presented by improving the Boost-Sepic converter and adding two gain units of coupling inductor and switched capacitor.First,the input inductor in the combined Boost-Sepic converter was replaced with a coupled inductor primary side to ensure continuous input side current and clamp the power switch voltage;meanwhile,the coupled inductor multiplier unit was connected in series with the switching capacitor to improve the voltage gain.In the converter,a pas-sive clamp absorption loop was used to recycle the energy of the leakage inductance of the coupled induc-tor,suppresses voltage spikes generated on the power switch.The new Boost-Sepic converter was ana-lyzed in detail,including the selection of operating modes,voltage gain,switching device voltage and current stress,and device parameters,and compared with other high-gain converters.Finally,the feasi-bility and correctness of the converter was verified by a 200 W experimental prototype.
high gainlow stresscoupled inductorswitched capacitorpassive clampBoost-Sepic converter
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