This article presents detailed small-signal modeling and closed-loop control design for transient performance evaluation of a high-frequency snubberless isolated current-fed push–pull dc–dc converter. The topology attains the natural commutation of semiconductor devices through zero current switching. The state-space averaging technique is employed to derive the transfer functions. A two-loop average current controller is designed and implemented on a digital signal processor to evaluate and demonstrate the transient performance of the converters. A complete procedure for a closed-loop control design is illustrated. Simulation results using PSIM 11.1.64 with the designed controller are shown to validate the stability of the system. Experimental results demonstrated satisfactory transient performance at various load conditions of the converter and validated the derived model and the control design.

中文翻译：

---

无缓冲器自然钳位软开关电流馈电推挽DC/DC转换器的小信号分析与控制

本文介绍了详细的小信号建模和闭环控制设计，用于评估高频无缓冲器隔离式电流馈送推挽 DC-DC 转换器的瞬态性能。该拓扑结构通过零电流开关实现了半导体器件的自然换向。采用状态空间平均技术来导出传递函数。在数字信号处理器上设计并实现了一个双回路平均电流控制器，以评估和演示转换器的瞬态性能。说明了闭环控制设计的完整程序。使用带有设计控制器的 PSIM 11.1.64 的仿真结果显示验证系统的稳定性。