A NON-ISOLATED ZETA-BOOST INTEGRATED DC-DC CONVERTER WITH REDUCED SWITCH STRESSES
DOI:
https://doi.org/10.62985/j.huit_ojs.vol26.no2E.378Từ khóa:
Step-up/step-down dc-dc converter, reduced voltage stress, non-isolated, large voltage conversion ratioTóm tắt
This paper presents a novel non-isolated buck-boost DC power converter topology derived from the integration of the Zeta and Boost converter topologies, which is capable of smooth transition between step-down and step-up operating modes while providing an extended voltage conversion range. By analyzing the converter operation in CCM, closed-form expressions for the voltage conversion ratio, current sharing, and semiconductor stresses are obtained using volt–second and charge balance conditions. To improve input-side performance, an LC input filter is systematically designed according to the Middlebrook impedance criterion, effectively reducing switch current ripple and electromagnetic interference (EMI) without degrading the converter’s dynamic characteristics. In addition, a small-signal model is developed for transfer function analysis and proportional–integral (PI) controller design, ensuring robust closed-loop stability with adequate gain and phase margins. Comparative evaluations and comprehensive simulations carried out in MATLAB/Simulink and PSIM confirm the analytical framework and the performance merits of the presented system.
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