A Novel High-Gain Single-Switch DC–DC Converter With Voltage-Lifting Technique and Nonlinear Gain-Compensated PI Control for EV Applications

Abstract

Power electronics converters that are high-performance and efficient are essential to the production of power from renewable sources. Nevertheless, low-voltage generation poses a serious challenge for electric vehicle applications utilizing renewable power sources like solar, fuel cells, etc. For this reason, high-gain (HG) DC-DC converters with low duty cycle variation are seen to be crucial for the use of EVs powered by renewable energy. This research presents a novel HG converter using the switched-inductor and voltage lifting approach. The suggested circuit uses a single switch to achieve an impressive voltage gain of approximately 8 times at 60% duty ratio while putting minimal voltage stress on the components. In both continuous and discontinuous conduction modes, the suggested circuits steady-state analysis is described. A design approach with an emphasis on components is examined, and it is compared extensively with state-of-the-art topologies. The performance of the proposed high-gain DC-DC converter with the nonlinear gain compensated PI voltage control (NGC-PI) based control strategy is evaluated under various operating conditions. A prototype of a 200W converter is tested in the lab with an input voltage of 24 V DC. The real-time performance and efficacy of the proposed converter are in line with analytical assumptions. The proposed converter achieves a peak analytical efficiency of 94.46%, while the experimentally measured efficiency remains in the range of 93-95% under different load and power conditions.