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

摘要

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 (c) 2016 John Wiley & Sons, Ltd.