High‐efficiency multi‐string LED driver based on constant current bus with time‐multiplexing control

2016 ◽  
Vol 52 (9) ◽  
pp. 746-748 ◽  
Author(s):  
Xueshan Liu ◽  
Jianping Xu ◽  
Qi Yang ◽  
Duo Xu
Keyword(s):  
High Efficiency ◽  
Constant Current ◽  
Led Driver

Fly-Back Mode Constant Current LED Driver

2014 ◽  
Vol 530-531 ◽  
pp. 1093-1099
Author(s):  
Jia Zhi Yang ◽  
Sheng Li Yi ◽  
Fei Yang ◽  
Cun Bo Jiang ◽  
Xi Le Wang ◽  
...  
Keyword(s):  
Power Supply ◽  
High Efficiency ◽  
Life Time ◽  
Constant Current ◽  
Constant Voltage ◽  
Output Current ◽  
Led Driver ◽  
Current Feedback ◽  
Low Load ◽  
Long Life

LED driver plays an important role in unleashing many advantages of LED, such as high efficiency, long life-time. A constant current fly-back LED driver based on TOP222 is designed in this paper, and the transformer of the constant current power supply and the constant current feedback circuit are deeply researched. The experiment shows that, the output current of the LED driver is 1A, the output power is 10W, the power supply works in constant voltage mode within the low load situation. The result shows that the driver featured with good stability, constant-current characteristic, and high efficiency, is capable for driving LED.

A high efficiency and power factor, segmented linear constant current LED driver

2015 ◽  
Vol 36 (4) ◽  
pp. 045010 ◽  
Author(s):  
Yongyuan Li ◽  
Wei Guo ◽  
Zhangming Zhu
Keyword(s):  
Power Factor ◽  
High Efficiency ◽  
Constant Current ◽  
Led Driver

scholarly journals Design of a high performance AC-DC LED driver based on SEPIC topology

2021 ◽  
Vol 12 (2) ◽  
pp. 870
Author(s):  
Fouzia Ferdous ◽  
A. B. M. Harun Ur Rashid
Keyword(s):  
Power Factor ◽  
High Power ◽  
High Efficiency ◽  
System Stability ◽  
Input Current ◽  
Constant Current ◽  
Led Driver ◽  
Good Efficiency ◽  
Soft Start ◽  
High Power Factor

Light emitting diodes (LEDs) are current driven devices. So, it is essential to maintain the stability of LED voltage and current. Variation of temperature may cause of instabilities and bifurcations in the LED driver. Driving LEDs from an offline power source faces design challenges like it have to maintain low harmonics in input current, to achieve high power factor, high efficiency and to maintain constant LED current and to ensure long lifetime. This paper proposes the technique of harmonics reduction by using parametric optimization of Single ended primary inductor converter (SEPIC) based LED driver. Without optimization of SEPIC parameters input energy will not be properly transferred to the load and this un-transferred energy will be transmitted to the source. Consequently, the quality of input current will be hampered i.e. harmonics will contaminate the input current. Focussing this, the paper has presented the design of a non-isolated integrated-stage single-switch constant current LED driver operating in discontinuous conduction mode (DCM) in SEPIC incorporating the design of control circuit with soft start mechanism. This LED driver has achieved a good efficiency (90.6%) and high-power factor (0.98) with reduced harmonics (3.35%). System stability has been determined and simulation studies are performed to confirm the validity of the LED driver circuit. A laboratory prototype is built.

Electrochemical Oxidative Esterification of Thiophenols: Efficient Access to Sulfinic Esters

2020 ◽  
Vol 17 (7) ◽  
pp. 540-547
Author(s):  
Chun-Hui Yang ◽  
Cheng Wu ◽  
Jun-Ming Zhang ◽  
Xiang-Zhang Tao ◽  
Jun Xu ◽  
...  
Keyword(s):  
Organic Synthesis ◽  
Efficient Method ◽  
High Efficiency ◽  
Building Blocks ◽  
Constant Current ◽  
Good Efficiency ◽  
Oxidative Esterification ◽  
Efficient Access ◽  
New Applications ◽  
Sulfinic Esters

Background: The sulfinic esters are important and useful building blocks in organic synthesis. Objective: The aim of this study was to develop a simple and efficient method for the synthesis of sulfinic esters. Materials and Methods: Constant current electrolysis from thiols and alcohols was selected as the method for the synthesis of sulfinic esters. Results and Discussion: A novel electrochemical method for the synthesis of sulfinic esters from thiophenols and alcohols has been developed. Up to 27 examples of sulfinic esters have been synthesized using the current methods. This protocol shows good functional group tolerance as well as high efficiency. In addition, this protocol can be easily scaled up with good efficiency. Notably, heterocycle-containing substrates, including pyridine, thiophene, and benzothiazole, gave the desired products in good yields. A plausible reaction mechanism is proposed. Conclusion: This research not only provides a green and efficient method for the synthesis of sulfinic esters but also shows new applications of electrochemistry in organic synthesis. It is considered that this green and efficient synthetic protocol used to prepare sulfinic esters will have good applications in the future.

scholarly journals A High Efficiency LED Driver Circuit using LLC Resonant Converter

2010 ◽  
Vol 15 (1) ◽  
pp. 35-42 ◽  
Author(s):  
Dae-Seong Shin ◽  
Young-Jin Jung ◽  
Sung-Soo Hong ◽  
Sang-Kyu Han ◽  
Byung-Jun Jang ◽  
...  
Keyword(s):  
High Efficiency ◽  
Resonant Converter ◽  
Led Driver ◽  
Driver Circuit ◽  
Llc Resonant Converter

scholarly journals Fully Integrated Buck and Boost Converter as a High Efficiency, High-Power-Density Off-Line LED Driver

2020 ◽  
Vol 35 (11) ◽  
pp. 12238-12251
Author(s):  
Guirguis Z. Abdelmessih ◽  
J. Marcos Alonso ◽  
Marco A. Dalla Costa ◽  
Yu-Jen Chen ◽  
Wen-Tien Tsai
Keyword(s):  
Power Density ◽  
High Power ◽  
High Efficiency ◽  
Boost Converter ◽  
High Power Density ◽  
Led Driver ◽  
Fully Integrated
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