Three-Phase Current-Fed Isolated DC–DC Converter With Zero-Current Switching

This project presents a three-phase current-fed isolated DC–DC converter with zero-current switching (ZCS) for efficient power conversion in renewable energy and high-power applications. The proposed converter employs a three-leg current-fed bridge, high-frequency star-connected transformers, and diode rectifier bridges to achieve galvanic isolation and high voltage gain while maintaining a constant input current, which is highly desirable for renewable energy sources such as Zero-current switching for all primary switches is achieved using transformer leakage inductance, auxiliary resonant capacitors, and a constant-frequency phase-shift modulation strategy, effectively reducing switching losses and suppressing overvoltage spikes during turn-off. The three-phase architecture enables modular power conversion, reduced magnetic size, and improved power handling capability compared to conventional single-phase isolated converters. Wind energy systems. The proposed converter is well suited for distributed generation systems and high-power applications such as offshore wind energy conversion systems. By using Matlab Simulink software.

Keywords: —Current-fed dc–dc converter, high-frequency isolation, phase-shift pulse width modulation (PWM), three-phase dc–dc converter, zero-current switching (ZCS).