scholarly journals A novel single-switch high power factor LED driver topology with high-frequency PWM dimming capability

2013 ◽  
Vol 18 (1) ◽  
pp. 855-863
Author(s):  
Pedro Santos Almeida ◽  
Guilherme Márcio Soares ◽  
Henrique Antônio Carvalho Braga
Keyword(s):  
Power Factor ◽  
High Power ◽  
High Frequency ◽  
Led Driver ◽  
High Power Factor ◽  
Pwm Dimming

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.

Output power feedforward technique applied to a high power factor rectifier with high frequency transformer

2013 ◽  
Author(s):  
Julio Cesar Secolo Ganacim ◽  
Martin Breus Meier ◽  
Alceu Andre Badin ◽  
Roger Gules ◽  
Eduardo Felix Ribeiro Romaneli ◽  
...  
Keyword(s):  
Output Power ◽  
Power Factor ◽  
High Power ◽  
High Frequency ◽  
High Frequency Transformer ◽  
High Power Factor

scholarly journals Double Modulation Applied To A High Power Factor Rectifier With High Frequency Transformer For Ups Application

2018 ◽  
Vol 23 (1) ◽  
pp. 47-58
Author(s):  
Roger Gules ◽  
Daniel Alvarenga ◽  
Martin Meier ◽  
Alceu Badin ◽  
Eduardo Romaneli
Keyword(s):  
Power Factor ◽  
High Power ◽  
High Frequency ◽  
High Frequency Transformer ◽  
High Power Factor ◽  
Double Modulation

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

Proposal of a low cost high frequency isolation high power factor AC-DC-AC power supply

2011 ◽  
Author(s):  
Rene P. T. Bascope ◽  
Luiz D. S. Bezerra ◽  
Levy F. Costa ◽  
Francisco K. A. Lima ◽  
Cicero M. T. Cruz
Keyword(s):  
Power Factor ◽  
High Power ◽  
Power Supply ◽  
High Frequency ◽  
Low Cost ◽  
Ac Power ◽  
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
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