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.

52.2: Hybrid Tandem White OLEDs with High Efficiency and Long Life-time for AMOLED Displays and Solid-State Lighting

2010 ◽  
Vol 41 (1) ◽  
pp. 778 ◽  
Author(s):  
Tukaram K. Hatwar ◽  
Jeffrey P. Spindler ◽  
Marina Kondakova ◽  
David Giesen ◽  
Joseph Deaton ◽  
...  
Keyword(s):  
Solid State ◽  
High Efficiency ◽  
Life Time ◽  
Solid State Lighting ◽  
Long Life ◽  
White Oleds

A multipurpose power supply for constant current, constant voltage, and constant power applications

2021 ◽  
Vol 92 (11) ◽  
pp. 114706
Author(s):  
Geethanjali Pandeswara ◽  
Naresh Pasula ◽  
Geshma Kumari R
Keyword(s):  
Power Supply ◽  
Constant Current ◽  
Constant Voltage ◽  
Constant Power

Parameters Design of Main Circuit of AC Constant Voltage Power Supply Based on Dual Directional Reversible PWM Control

2011 ◽  
Vol 383-390 ◽  
pp. 5771-5777
Author(s):  
Yu Quan Ma ◽  
Li Hong Zhang ◽  
Shu Fen Han ◽  
Zhi Peng Lin
Keyword(s):  
High Precision ◽  
Power Supply ◽  
Small Volume ◽  
High Efficiency ◽  
Pwm Control ◽  
Constant Voltage ◽  
Dc Voltage ◽  
Quality Of Supply ◽  
Parameters Calculation

The constant voltage power supply with dual directional reversible PWM compensation has merits of high precision, high efficiency, small volume, and so on. To ensure the quality of supply, it is important to fix the value of inductance, capacitance in main circuit. From the angle of filtering, and through analysis of the circuit working, detailed formulas of the inductance and capacitance calculation are given and an example of it is given too. In parameters calculation, to reduce the volume, the filter inductance is taken a smaller value but the capacitance is taken a greater value; the DC smoothing capacitance should be chosen according to the amplitude limit of DC voltage rising in inversion, and should be taken as great as possible to maintain voltage stabilizing precision.

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

A Novel High Efficiency Solution of High Power LED Lighting

2011 ◽  
Vol 301-303 ◽  
pp. 121-126
Author(s):  
Qiang Fan ◽  
Xian Song Fu ◽  
Yi Li Liu ◽  
Ping Juan Niu ◽  
Tie Cheng Gao
Keyword(s):  
High Power ◽  
High Efficiency ◽  
Supply Voltage ◽  
High Reliability ◽  
Current Mode ◽  
Constant Current ◽  
Output Current ◽  
High Power Led ◽  
Key Factor ◽  
Continuous Current

High power LED is a kind of ideal green lighting source, which owns longer life, higher efficiency and lower electricity power consumption than incandescent lamps and fluorescent bulbs. Constant current driver is the most key factor for high power LED’s premium properties. Based on the specific chip LM3478, a novel Boost DC/DC converting circuit to drive LED was proposed. The whole circuit structure was simple, and owned high reliability with over current protection. The circuit operates continuous current mode (CCM), with normal supply voltage 12V. The constant output current is 700mA, which can drive two-row LED series, 5 LEDs at least each series. The test results show that the electricity efficiency is up to 93.20% and that the output current deviation is 7.71%. The operating temperature range is -40~+125°C.

The Design of High Power LED Driver Power Supply Based on the Pattern of LLC Harmonic

2014 ◽  
Vol 997 ◽  
pp. 862-867
Author(s):  
Ting Cao
Keyword(s):  
High Power ◽  
Power Supply ◽  
High Efficiency ◽  
Low Loss ◽  
Led Driver ◽  
High Power Led ◽  
Driver Circuit ◽  
Llc Resonant Converter ◽  
Working Principle ◽  
Conduction Mode

The working principle of LLC resonant converter is analyzed. On the basis of the analysis, a high power LED driver power supply circuit is designed based on LLC resonant model. Driver circuit is two-stage: the pre-driver circuit using boundary-conduction mode controller L6562 achieves PFC function, while the post-stage LLC half-bridge topology provides constant pressure parts. This structure makes the overall efficiency of the circuit is higher. And the simulation experiment of the circuit is carried out and the experimental results verify that the driver power supply can achieve high efficiency, low loss and so on.

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