1. Methodology for reducing the filtering capacitor in low-flicker LED drivers
- Author
-
Ali Shagerdmootaab and Mehrdad Moallem
- Subjects
AC–DC buck–boost ,driver circuits ,filtering capacitor ,XLamp XP-G LED strings ,Computer science ,Flyback transformer ,Energy Engineering and Power Technology ,02 engineering and technology ,01 natural sciences ,Capacitance ,law.invention ,law ,power 20 W ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,Electronic engineering ,low-flicker LED drivers ,AC–DC light-emitting diode driver ,filter capacitance ,electrolytic capacitors ,Ceramic capacitor ,AC-DC power convertors ,010302 applied physics ,Electrolytic capacitor ,flicker noise ,light flicker ,Flicker ,020208 electrical & electronic engineering ,General Engineering ,flicker index ,Cree CR22-32L ,Filter capacitor ,Capacitor ,Film capacitor ,film capacitor ,lcsh:TA1-2040 ,lcsh:Engineering (General). Civil engineering (General) ,Software ,ceramic capacitors ,flyback LED driver - Abstract
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.
- Published
- 2017
- Full Text
- View/download PDF