Dissertation > Excellent graduate degree dissertation topics show

Analysis and Design of Resonant Efficient LED Driver

Author: ChenYue
Tutor: QianZhaoMing
School: Zhejiang University
Course: Power Electronics and Power Drives
Keywords: high efficient LED driver LLC multi-channel current-sharing passive current-sharing multi-element resonance LLCC
CLC: TM923.34
Type: Master's thesis
Year: 2012
Downloads: 167
Quote: 1
Read: Download Dissertation

Abstract


In order to meet the requirement of low-carbon and Energy conservation, high efficiency and energy conservation has become the most important developing direction in lighting industry. As the most potential illuminant, LED possesses many merits such as high efficiency and long life, thus has become a hot topic and developed rapidly in recent years. High efficient high power LED driver has become a research hotpot as well. Based on this background, this project mainly research on high efficient high power LED driver, including the circuit topology and optimization design methodology. A novel LLCC resonant converter with precise current sharing for two-channel LED driver is also discussed.The research in this paper mainly includes two aspects. First is the design of high efficient single output LED driver. LLC resonant converter is chosen as the most efficient topology based on some analysis and comparison. A new design method which is suitable for wide output range application is proposed in this paper. Circuit principle analysis, working region selection, DC characteristic deduction and optimization of design parameters are also discussed in detail. Based on the analysis and discussion, a detailed optimal design procedure is proposed. Finally, a 140W experimental prototype is built to verify the design and proved a high efficiency after optimization.Based on the single output LED driver, a LLCC resonant converter with automatic precise current-sharing is proposed for two-channel LED driver. With a resonant capacitor connected in series with the transformer secondary winding, the currents of the two channels are precisely shared even for different LED strings with different voltage drops. The circuit operation principle under both CCM and DCM modes, current sharing principle, AC equivalent circuit analysis, DC gain deduction and design considerations are discussed. A prototype of 140W two-channel LED driver is built to verify the proposed current sharing circuit.

Related Dissertations

  1. Improvement of Planar Passive Integration Structure for LLC Resonant Converter,TM46
  2. Shareholders' equity on a limited liability company retirement system,D922.291.91
  3. Microwave frequency with the LLC resonant soft-switching power,TM925.54
  4. The Research and Application of LED Drive & Control Technology,TM923.34
  5. Study of LED Driver with Multiple Led-channels and Intelligent Lighting Technology,TM46
  6. The wide input high gain Isolated DC-DC converter,TM46
  7. Research on the Off-grid Inverter of the Photovoltaic Power Generation System,TM464
  8. High Efficiency LED Driver Study,TM46
  9. Research on High Efficiency High Power Density AC/DC Converter,TM46
  10. Lights with LED drive power research and design,TM46
  11. Development on Half-bridge LLC Resonant DC/DC Converter,TM46
  12. Research of Planar Passive Integration for LLC Resonant Converter,TM46
  13. High Efficiency AC/DC Conversion Technique Based on LLC Resonant Circuit,TM461.5
  14. Research on Characters and Parameters Optimization Method of LLC Resonant Converter,TM46
  15. Reversal Mechanism of Lopinavir on Multidrug Resistant of LLC/cMOAT Cells,R965
  16. The Research of 500VA Aeronautical Static Inverter,TM461
  17. Research on Self-oscillating LLC Resonant Converter,TM461
  18. Research on Control Technique of High Frequency Solid-State Induction Heating Power Supply,TM919
  19. Angiotensin Ⅱ type 1 receptor antagonist transdifferentiation of tubular epithelial cell line LLC-PK1 cells hypertrophy,R692.5
  20. The construction of bioartificial renal tubule assist device in vitro,R318.16
  21. Research on Interleaved LLC Resonant Converter Technology,TM46

CLC: > Industrial Technology > Electrotechnical > Electrification,electrical energy application > Electrical lighting > Bulbs \u0026 Tubes > Semiconductor light emitting light
© 2012 www.DissertationTopic.Net  Mobile