This article proposes an LED driver that consists of a ceramic‐capacitor‐input rectifier and a buck‐boost converter. The LED driver has an advantage of long life because it does not contain any electrolytic capacitors. However, the issue with electrolytic capacitor‐less LED driver is that the ripple of the smoothed voltage becomes large due to insufficient capacitance of the smoothing capacitor. The proposed method, which uses the discontinuous current mode of a buck‐boost converter, reduces the output current ripple under such conditions. Experimental results using a 5.7 W LED driver prototype demonstrate that the proposed method reduces the output current ripple and that the percent flicker becomes 4.4%, which is smaller than the recommended upper limit of 8%.

中文翻译：

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使用陶瓷电容器输入电路和降压-升压转换器降低LED驱动器的输出电流纹波

本文提出了一种由陶瓷电容器输入整流器和降压-升压转换器组成的LED驱动器。LED驱动器的优点是使用寿命长，因为它不包含任何电解电容器。但是，无电解电容的LED驱动器的问题在于，由于平滑电容器的电容不足，导致平滑电压的纹波变大。所提出的方法使用降压-升压转换器的不连续电流模式，可在这种情况下减小输出电流纹波。使用5.7 W LED驱动器原型的实验结果表明，所提出的方法减少了输出电流纹波，并且闪烁百分比变为4.4％，小于建议的8％上限。