This letter proposes a new switching cell with switching frequency modulation (SFM) and resistive characteristic (voltage follower) for converters that are current-fed. Soft commutation and current null (when the diode blocks) are achieved with SFM and a fixed duty cycle for converters based on this switching cell. The operating principle, a mathematical analysis of the cell, and two topological variations are presented. In addition, the basic characteristics of the main topologies are shown, and the experimental results of a 1-kW boost continuous conduction mode converter prototype are discussed to demonstrate the operating characteristics.

中文翻译：

---

用于CCM电压跟随转换器的具有调频功能的开关单元

这封信提出了一种新的开关单元，该开关单元具有开关频率调制（SFM）和电阻特性（电压跟随器），用于电流馈送的转换器。通过SFM和基于此开关单元的转换器的固定占空比，可以实现软整流和电流零（当使用二极管模块时）。给出了工作原理，单元的数学分析以及两个拓扑变化。此外，还展示了主要拓扑的基本特性，并讨论了1kW升压连续传导模式转换器原型的实验结果，以证明其工作特性。