Dimmable MR16 LED drivers with low output ripple and wide duty ratio operating range

In this paper, a novel single‐switch DC–DC converter is proposed for dimmable MR16 light‐emitting diode (LED) drivers. The proposed driver can achieve very low output voltage ripple without using MHz switching frequency; therefore, small non‐electrolytic capacitors can be used to achieve longer life...

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Bibliographic Details
Published in:International journal of circuit theory and applications 2017-12, Vol.45 (12), p.2290-2306
Main Authors: Chen, Po‐Yen, Pan, Ching‐Tsai, Liu, Yi‐Hua
Format: Article
Language:English
Subjects:
Circuits
Dimming
Electric converters
Electrolytic capacitors
electrolytic capacitor‐less
high efficiency
LED driver
Light emitting diodes
long lifetime
low output voltage ripple
Voltage converters (DC to DC)
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Summary:In this paper, a novel single‐switch DC–DC converter is proposed for dimmable MR16 light‐emitting diode (LED) drivers. The proposed driver can achieve very low output voltage ripple without using MHz switching frequency; therefore, small non‐electrolytic capacitors can be used to achieve longer lifetime and higher efficiency. Also, because of special merit of the proposed converter, it can be designed so that much wider duty ratio operating range can be achieved for LEDs. Hence, better digital dimming level resolution can be attained. Finally, a prototype driver for MR16 LED lamps is constructed to demonstrate the effectiveness of the converter. Experimental results show that a maximum efficiency of 92% can be achieved. Copyright © 2016 John Wiley & Sons, Ltd. The proposed converter can achieve low voltage ripple; hence, non‐electrolytic capacitors can be used. The advantages of the proposed driver include long lifetime, high efficiency, low output ripple, wide duty cycle operation range, and better digital dimming level resolution.
ISSN:0098-9886
1097-007X
DOI:10.1002/cta.2304