Methodology for reducing the filtering capacitor in low-flicker LED drivers

The Journal of Engineering

Ali Shagerdmootaab¹  Mehrdad Moallem¹ 

[1] School of Mechatronic Systems Engineering, Simon Fraser University, Surrey, BC, Canada

关键词: ceramic capacitors;    filtering capacitor;    light flicker;    Cree CR22-32L;    flicker index;    low-flicker LED drivers;    AC–DC buck–boost;    AC–DC light-emitting diode driver;    electrolytic capacitors;    filter capacitance;    flyback LED driver;    XLamp XP-G LED strings;    film capacitor;    power 20 W;   

DOI  :  10.1049/joe.2017.0092

学科分类：工程和技术（综合）

来源: IET

【 摘 要 】

The amount of light flicker in an AC–DC light-emitting diode (LED) driver is dependent on the size of filter capacitors. In this study, a study is conducted on reducing the size of filter capacitor in an AC–DC buck–boost/flyback LED driver using flicker index and per cent flicker light measures. Using this approach, a procedure for minimising the filter capacitance is presented. It is then concluded that relatively small filter capacitors such as film or ceramic capacitors can be chosen while meeting light flicker requirements. Hence, an LED drive with a longer lifetime can be achieved when compared with a driver using electrolytic capacitors. Experimental studies are presented for a 20 W AC–DC buck–boost/flyback LED driver prototype which utilises ceramic capacitors for driving Cree CR22-32L and XLamp XP-G LED strings.

【 授权许可】

CC BY