| Nowadays,the world's energy shortage and environmental deterioration are becoming more and more severe.Therefore,photovoltaic and fuel cells and other stock-rich environment-friendly new energy generation methods are receiving increasing attention.In general,the output of a single photovoltaic panel and fuel cell is a low-grade DC voltage,which usually needs to be raised by a DC boost converter to achieve grid-connected power generation requirements.Therefore,the research of DC/DC converters with high voltage gain and high efficiency has important significance.Based on previous research results,the paper first studied a dual-switch staggered parallel high-gain boost converter based on dual-coupled inductors.With the introduction of switched-capacitor and coupled-inductor technology,the structure can achieve high-gain switching targets with non-limiting duty cycles.The clamp circuit recovers the leakage inductance energy while suppressing the switching voltage spike,and the output diode realizes zero current shutdown.Then,the two switches of the converter are changed to a common ground connection,a set of capacitance-diode structures is added,and double voltage cells are formed in a nested manner.A double-voltage unit interleaving parallel high-gain Boost converter based on a coupling inductor is proposed.The improvement of the two switch connections of the converter can reduce the number of driving power supplies,and the voltage gain of the converter is further improved.The first converter using the state-space average method is used to construct a small signal model and a closed-loop feedback controller is designed.In this paper,based on the detailed analysis of the operating principle and steady-state performance of two proposed converters,the proposed converters are verified by Matlab/Simulink simulation.Finally,a 200 W prototype is built with the TMS320F2812 DSP as the core controller for experimental verification to verify the correctness of the theoretical analysis. |
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