Abstract The high-brightness light-emitting diodes (LEDs) require an AC/DC converter with power factor correction (PFC). The large output electrolytic capacitor, which is used to minimize the low frequency LED current ripple, degrades the operating lifetime of the LED driver. In order to increase the lifetime of an AC–DC LED driver, the electrolytic capacitor should be eliminated without significantly increasing the output current ripple. In this article, an isolated single-stage single-switch AC/DC high power factor LED driver without electrolytic capacitor is proposed in which a zeta power factor (PF) corrector is integrated with a forward converter. The detailed theoretical analysis and design procedure of the proposed single-stage PFC converter is presented. The experimental results of a 110 Vrms, 21 W prototype verify the theoretical analysis. The input PF is 0.99 in the proposed converter that complies with lighting equipment standards such as IEC-1000-3-2 for class C equipment.

中文翻译：

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一种用于无电解电容的 LED 驱动器的隔离式 PFC Zeta 正向单级单开关

摘要 高亮度发光二极管 (LED) 需要具有功率因数校正 (PFC) 功能的 AC/DC 转换器。用于最小化低频 LED 电流纹波的大输出电解电容器会降低 LED 驱动器的工作寿命。为了延长 AC-DC LED 驱动器的使用寿命，应在不显着增加输出电流纹波的情况下取消电解电容器。在本文中，提出了一种无电解电容器的隔离式单级单开关 AC/DC 高功率因数 LED 驱动器，其中将 zeta 功率因数 (PF) 校正器与正向转换器集成在一起。提出了所提出的单级 PFC 转换器的详细理论分析和设计程序。110 Vrms、21 W 原型的实验结果验证了理论分析。