Abstract Power converters, operating under fixed switching control, observe a substantial efficiency drop at light load owing to the associated fixed switching losses. To maintain the flat efficiency curve, varying the switching frequency depending on the load has been explored in the literature as a better alternative to fixed-frequency operation. This paper presents Event-triggered Sliding Mode Control (ETSMC) based variable frequency modulation scheme for power converters. The presented strategy leverage converter dynamics to execute control signal. This need-based switching technique ensures reduced switching losses and hence improved efficiency, without compromising on performance. Widely adopted switching reduction technique of Hysteresis modulation based SMC is established as a special case of ETSMC, thus highlighting the proposed scheme’s generic nature. The scheme is demonstrated on an isolated half-bridge converter. Simulations, as well as experimentation results, are included to support the theory.

中文翻译：

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用于提高电源转换器轻载效率的事件触发滑模控制

摘要 功率转换器在固定开关控制下运行，由于相关的固定开关损耗，在轻负载下观察到显着的效率下降。为了保持平坦的效率曲线，文献中已经探索了根据负载改变开关频率作为固定频率操作的更好替代方法。本文介绍了基于事件触发滑模控制 (ETSMC) 的电源转换器变频调制方案。所提出的策略利用转换器动态来执行控制信号。这种基于需求的开关技术可确保减少开关损耗并因此提高效率，而不会影响性能。广泛采用的基于迟滞调制的 SMC 的开关减少技术被建立为 ETSMC 的特例，从而突出了拟议方案的通用性。该方案在隔离式半桥转换器上进行了演示。包括模拟和实验结果以支持该理论。