93% Efficiency and 0.99 power factor in pseudo-linear LED driver

2016 ◽  
Author(s):  
Shao-Wei Chiu ◽  
Chun-Chieh Kuo ◽  
Kai-Cheng Chuang ◽  
Wen-Hau Yang ◽  
Ke-Horng Chen ◽  
...  
Keyword(s):  
Power Factor ◽  
Led Driver

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.

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
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