Abstract
In this study, to achieve the constant current drive and brightness control without a separate pulse width modulation (PWM) converter, a single converter is designed and verified by experiment under the condition of a multiple LED light load with different output voltage (Vf) characteristics. In the case of the input of 140 Watt class level, the proposed converter can drive two voltage type 95 Vdc (300 mA) light emitting diode (LED) lights loads and 120 Vdc (300 mA) LED lights loads simultaneously. In addition, to improve commercial compatibility, the proposed converter is operated in a wide range of the input voltage 90~264 Vac; also, the Power Factor Correction (PFC) circuit with the input power factor of more than 0.9 is added. In order to maximize the power conversion efficiency, a LLC resonant converter is applied to the PFC block with the output voltage of 380 Vdc and to a DC-DC conversion block. Finally, reliability of the proposed converter is verified through total harmonic distortion (THD) and electromagnetic interference (EMI) tests.
Highlights
The topic of “low-carbon green growth industry” has been actively researched and developed
A Light Emitting Diode (LED) has high luminous efficiency and 20%~30% power savings compared to a conventional light source
The system consists of an AC power input part and a Power Factor Correction (PFC) circuit for improving the power factor, a DC/DC converter for building output voltage, and an LED driver for providing a constant current to the LED load
Summary
The topic of “low-carbon green growth industry” has been actively researched and developed. 1.7 billion tons of carbon oxide is emitted annually according to the power consumption of lighting. For this reason, research into highly efficient lights has been actively carried out. A Light Emitting Diode (LED) has high luminous efficiency and 20%~30% power savings compared to a conventional light source. 250 billion kWh power and 150 million tons of carbon oxide could be reduced through the use of LED lights [1,2]. When applying individual converters to each LED, the system cost is increased and the efficiency and life time of the system are reduced. The proposed converter can drive multi LED strings without an individual converter with constant current control and dimming control. A THD and an EMI noise tests are performed to verify the reliability of the proposed converter
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
