The main aim of this study is the development of a fast and secure charging system for electric vehicles. Recently, many different charging methods have been introduced. The main charging methods are the induction charging method and the conduction charging method. In this paper, the conduction charging method is employed. With regard to the conduction method, there are three levels of charging. At level 1, there is single-phase charging, while both single-phase and three-phase charging occur at level 2. Lastly, at level 3, a three-phase AC charging method, DC conduction charging method, and AC/DC conduction charging method is focused. The level 3 charging method is the main focus of this paper. Toward this end, a 12-diode rectifier or 12-pulse rectifier with a firing angle of zero degrees having two bridges is used for AC to DC conversion, while a SEPIC converter is used for DC-to-DC conversion. The design presented in this paper was simulated and verified using MATLAB/Simulink, and the results show that the Total Harmonic Distortion (THD) of the input current was reduced, and that overall efficiency was improved.

In this paper, a new topology of a step-up DC converter is presented for renewable energy applications, yielding a high step-up conversion ratio and reduced voltage stress across the switches. The proposed converter uses a hybrid switched-inductor and switched-capacitor cell to achieve the high voltage gain. Additionally, the capacitors in the switched cell also perform the function of clamping the voltage across switches. The proposed converter utilizes only a single controlled switch and operates in only two modes of conduction. The steady-state analysis and operating principle of the proposed hybrid step-up converter are discussed in detail and various mathematical equations have been derived. The analysis shows numerous improvements over the traditional DC-DC converters. Simulation was carried out in MATLAB Simulink 2021b on a 55% duty cycle and simulation results are compared with theoretical analysis. From simulation results, it is clear the proposed converter exhibits better performance compared to conventional boost and other traditional step-up converters with the same design parameters. Finally, a 31.5-watt hardware prototype was constructed and tested in the laboratory to experimentally validate the theoretical and simulation results.