High-Efficient High-Power-Factor Off-Line LED Driver based on Integrated Buck and Boost Converter

2019 ◽  
Author(s):  
Guirguis Z. Abdelmessih ◽  
J. Marcos Alonso ◽  
Wen-Tien Tsai ◽  
Marco A. Dalla Costa
Keyword(s):  
Power Factor ◽  
High Power ◽  
Boost Converter ◽  
Led Driver ◽  
High Power Factor ◽  
High Efficient

scholarly journals A Novel Single-Switch Single-Stage LED Driver with Power Factor Correction and Current Balancing Capability

Electronics ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 1340
Author(s):  
Yih-Her Yan ◽  
Hung-Liang Cheng ◽  
Chun-An Cheng ◽  
Yong-Nong Chang ◽  
Zong-Xun Wu
Keyword(s):  
Power Factor ◽  
High Power ◽  
Pulse Width Modulation ◽  
Power Factor Correction ◽  
Harmonic Distortion ◽  
Boost Converter ◽  
Single Stage ◽  
Led Driver ◽  
Flyback Converter ◽  
High Power Factor

A novel single-switch single-stage high power factor LED driver is proposed by integrating a flyback converter, a buck–boost converter and a current balance circuit. Only an active switch and a corresponding control circuit are used. The LED power can be adjusted by the control scheme of pulse–width modulation (PWM). The flyback converter performs the function of power factor correction (PFC), which is operated at discontinuous-current mode (DCM) to achieve unity power factor and low total current harmonic distortion (THDi). The buck–boost converter regulates the dc-link voltage to obtain smooth dc voltage for the LED. The current–balance circuit applies the principle of ampere-second balance of capacitors to obtain equal current in each LED string. The steady-state analyses for different operation modes is provided, and the mathematical equations for designing component parameters are conducted. Finally, a 90-W prototype circuit with three LED strings was built and tested. Experimental results show that the current in each LED string is indeed consistent. High power factor and low THDi can be achieved. LED power is regulated from 100% to 25% rated power. Satisfactory performance has proved the feasibility of this circuit.

scholarly journals A High-Power-Factor Dimmable LED Driver with Integrated Boost Converter and Half-Bridge-Topology Converter

2020 ◽  
Vol 10 (8) ◽  
pp. 2775
Author(s):  
Hung-Liang Cheng ◽  
Yong-Nong Chang ◽  
Lain-Chyr Hwang ◽  
Hau-Chen Yen ◽  
Shun-Yu Chan ◽  
...  
Keyword(s):  
Power Factor ◽  
High Power ◽  
Pulse Width Modulation ◽  
Light Emitting Diode ◽  
Current Mode ◽  
Boost Converter ◽  
Led Driver ◽  
Zero Voltage Switching ◽  
High Power Factor ◽  
Integrated Boost

This paper proposes a dimmable light-emitting diode (LED) driver featuring a high power factor and zero-voltage switching on (ZVS). The circuit is obtained by integrating a boost converter and a dc-dc converter with half-bridge topology. The high power factor is achieved by operating the boost converter in discontinuous current mode (DCM). The LEDs are dimmed by the control scheme of asymmetrical pulse-width modulation (ASPWM). The developed circuit eliminates the inherited dc-offset current of the transformer in a conventional asymmetrical half-bridge converter by introducing a balance capacitor. Both active switches can operate at ZVS by freewheeling the boost inductor current and the transformer magnetizing current to discharge the energy stored in their parasitic capacitance. The circuit operation is analyzed in detailed, and mathematical equations are derived. Finally, a 115-W prototype circuit for driving high brightness LEDs was built and tested. The experimental results verify the feasibility of the proposed LED driver with satisfactory performance. It can achieve a high power factor and ZVS operation.

Flicker-Free Single Switch Multi-String LED Driver With High Power Factor and Current Balancing

2019 ◽  
Vol 34 (7) ◽  
pp. 6747-6759 ◽  
Author(s):  
Xueshan Liu ◽  
Xuewen Li ◽  
Qun Zhou ◽  
Jianping Xu
Keyword(s):  
Power Factor ◽  
High Power ◽  
Led Driver ◽  
High Power Factor

High‐power‐factor dimmable LED driver with low‐frequency pulse‐width modulation

2016 ◽  
Vol 9 (10) ◽  
pp. 2139-2146 ◽  
Author(s):  
Hung‐Liang Cheng ◽  
Yong‐Nong Chang ◽  
Chun‐An Cheng ◽  
Chien‐Hsuan Chang ◽  
Yu‐Hung Lin
Keyword(s):  
Power Factor ◽  
High Power ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Low Frequency ◽  
Led Driver ◽  
High Power Factor ◽  
Frequency Pulse

Design of a high-power factor offline led driver employing a Ćuk-based low frequency pre-regulator

2017 ◽  
Author(s):  
Fernando J. Nogueira ◽  
Lucas H. G. Resende ◽  
Edmar S. Silva ◽  
Felipe B. Marinho ◽  
Cristiano G. Casagrande ◽  
...  
Keyword(s):  
Power Factor ◽  
High Power ◽  
Low Frequency ◽  
Led Driver ◽  
High Power Factor

Single-Stage Single-Switch Four-Output Resonant LED Driver With High Power Factor and Passive Current Balancing

2017 ◽  
Vol 32 (6) ◽  
pp. 4566-4576 ◽  
Author(s):  
Xueshan Liu ◽  
Qi Yang ◽  
Qun Zhou ◽  
Jianping Xu ◽  
Guohua Zhou
Keyword(s):  
Power Factor ◽  
High Power ◽  
Single Stage ◽  
Led Driver ◽  
High Power Factor ◽  
Passive Current

High Power Factor LED Driver with Improved Inductance

2014 ◽  
Vol 610 ◽  
pp. 142-146
Author(s):  
Lun Qiang Chen ◽  
Qing Hua Chen ◽  
Ying Chun Liang ◽  
Yi Ming Lu
Keyword(s):  
Cost Effectiveness ◽  
Power Factor ◽  
High Power ◽  
Experimental Results ◽  
Input Current ◽  
Led Driver ◽  
Low Input ◽  
Interior Lighting ◽  
High Power Factor ◽  
Current Ripples

This paper proposes a novel high power factor LED driver based on SY5800A for interior-lighting applications. High power factor is achieved by using the transformer with back winding coil and the transformer with “sandwich” winding coil. In addition, the proposed driver features cost-effectiveness, high circuit efficiency, low input current ripples and a reduced components count. A sample driver is developed to supply a 15W LED interior-lighting module with a 0.99 power factor. Experimental results demonstrate the functionalities of the proposed circuit.

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