New Gate Control Method of PWM Resonant Converters for Near-Zero-Ripple Fuel Cell Current

Various recent research has focused on reducing input current ripple to ease the life span and heat issue of fuel cells. Among various topologies, pulsewidth modulation resonant (PWMR) converters have become promising candidates for fuel cell dc–dc converters, and numerous prior studies have been conducted. However, they still either suffer from input current ripple or complex control and implementation. In this letter, a new gate control method for PWMR converters is proposed. The proposed method not only achieves the near-zero-ripple input current but also can improve power conversion efficiency by reducing the turn-
on
switching loss of synchronous rectifiers. The proposed gate control method was verified through 600 W PWMR prototype converters