Abstract
In this paper, two types of high step-up coupled inductor inverters based on qSBIs (quasi- switched boost inverters) are proposed. By applying the coupled inductor to the qSBIs, the voltage gain of the proposed inverter is regulated by turn ratio and duty ratio. Thus, a high voltage gain can be achieved without the circuits operating at the extreme duty cycle by choosing a suitable turn ratio of the coupled inductor. In addition, the proposed circuits have the characteristics of continuous input current and low voltage stress across the passive components. A boost unit can be added to the proposed inverters for further improvement of the voltage gain. In this paper, the working principle, steady state analysis, and the comparisons of the proposed inverter with other impedance-source inverters are described. A 200 W prototype was created and the experimental results confirm the correctness of the analysis in this paper.
Highlights
As the world’s energy structure has changed, renewable energy sources have been widely used in power generation, especially solar energy, such as photovoltaic (PV) power generation
In order to solve the above problems, this paper proposes a new type of qSBI
Of the coupled inductor, voltage gainwhile can be achieved while duty avoiding cycles in the proposed circuit, the proposed switch only plays the a supporting role, so the voltage androle, current stresses of in the circuit, switch only plays a supporting so the voltage the can be low.ofTherefore, inverters have the features of high voltage gain and andswitch current stresses the switchthe canproposed be low
Summary
As the world’s energy structure has changed, renewable energy sources have been widely used in power generation, especially solar energy, such as photovoltaic (PV) power generation. Of the coupled inductor, voltage gainwhile can be achieved while duty avoiding cycles in the proposed circuit, the proposed switch only plays the a supporting role, so the voltage androle, current stresses of [13,14,15,16,17,18]. In the circuit, switch only plays a supporting so the voltage the can be low.ofTherefore, inverters have the features of high voltage gain and andswitch current stresses the switchthe canproposed be low. The research background is introduced, and the cascade to increase voltage idea of applying a coupled inductor qSBI circuit is proposed. The research background is introduced, principle of the circuit, including the converter’s operating mode, the voltage gain, device voltage the idea of applying a coupled inductor to a qSBI circuit is proposed. The final chapter is the conclusion, summarizing the full paper and demonstrating the effectiveness of the proposed circuit
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