An Improved Asymmetrical Half-Bridge Converter with Self-Driven Synchronous Rectifier for Dimmable LED Lighting
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Author list: Mujjalinvimut E., Navaratana Na Ayudhya P., Sangswang A.
Publisher: Institute of Electrical and Electronics Engineers
Publication year: 2016
Journal: IEEE Transactions on Industrial Electronics (0278-0046)
Volume number: 63
Issue number: 2
Start page: 913
End page: 925
Number of pages: 13
ISSN: 0278-0046
eISSN: 1557-9948
Languages: English-Great Britain (EN-GB)
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Abstract
This paper proposes an adaptive feedback gain compensation technique and adaptive feedforward loop control based on analog design for an asymmetrical half-bridge converter without electrolytic capacitor to improve the system dynamic response and the system performance (i.e., low flickering and low ripple) for dimmable high-brightness light-emitting diode (LED) applications. In addition, an improved driving circuit of self-driven synchronous rectification (SR) is proposed for switching loss reduction at the secondary of the transformer. The control circuit is designed such that the SR metal-oxide-semiconductor field-effect transistor switch operates under zero-voltage switching (ZVS) mode while the driving signals are maintained within the acceptable voltage limits under duty cycle variations of the LED dimming applications. Simulation and experimental results obtained from a 60-W hardware prototype have confirmed the validity of the proposed method, where the settling time of the output current has been improved by 90% and the ripple of the output current has been reduced to less than 4% under rated current. The SR switches operate under ZVS condition throughout all operating regions where the maximum efficiency at 96.4% has been achieved. ฉ 1982-2012 IEEE.
Keywords
LED driver
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