Valley switching is one of the most efficient methods to decrease the switching losses in DC/DC converters. It uses a resonance between the converter's inductor and parasitic output capacitance of a metal–oxide–semiconductor field-effect transistor. In this study, the drawbacks of the valley switching in buck light-emitting-diode (LED) drivers are investigated. It shows that in spite of decreasing the switching losses, the valley switching method reduces its efficiency in some conditions. Also, it is clarified that the valley switching method not only causes current fluctuation in boost power factor correction converters but also malfunctions the buck LED drivers' performance. In this study, a semi-valley switching and its implementation are introduced to solve these problems. In general, it is shown that the proposed method improves both the efficiency and the performance of the buck LED driver, simultaneously. The methodologies are implemented in an experimental prototype to verify the proposed method.

中文翻译：

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用于降压LED驱动器的半谷开关方法，以提高其效率和性能

谷底开关是减少DC / DC转换器中开关损耗的最有效方法之一。它利用了转换器的电感器和金属氧化物半导体场效应晶体管的寄生输出电容之间的谐振。在这项研究中，研究了降压发光二极管（LED）驱动器中谷值切换的缺点。结果表明，尽管降低了开关损耗，但谷值开关法在某些情况下仍会降低其效率。此外，可以明确的是，谷值切换方法不仅会导致升压功率因数校正转换器中的电流波动，还会使降压LED驱动器的性能出现故障。在这项研究中，介绍了一种半谷切换及其实现来解决这些问题。一般来说，结果表明，所提出的方法同时提高了降压LED驱动器的效率和性能。该方法在实验原型中得以实现，以验证所提出的方法。