Digitally controlled improved THD and power factor single-stage flyback LED driver with active input-current wave-shaping

2013 ◽  
Author(s):  
Afroz Imam ◽  
Biju Antony
Keyword(s):  
Power Factor ◽  
Single Stage ◽  
Input Current ◽  
Led Driver ◽  
Current Wave ◽  
Digitally Controlled

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.

A Single-Stage Single-Switch Soft-Switching Power-Factor-Correction LED Driver

2017 ◽  
Vol 32 (10) ◽  
pp. 7932-7940 ◽  
Author(s):  
Behzad Poorali ◽  
Ehsan Adib ◽  
Hosein Farzanehfard
Keyword(s):  
Power Factor ◽  
Power Factor Correction ◽  
Soft Switching ◽  
Single Stage ◽  
Led Driver ◽  
Switching Power

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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