Single-Stage Electrolytic-Capacitors-Free AC-to-DC LED Driving Circuit with High-Power-Factor

2012 ◽  
Author(s):  
Yan-Cun Li ◽  
Chern-Lin Chen
Keyword(s):  
Power Factor ◽  
High Power ◽  
Single Stage ◽  
Electrolytic Capacitors ◽  
High Power Factor ◽  
Driving Circuit

Single‐stage single‐switch high power factor driving circuit for lighting applications

2019 ◽  
Vol 12 (15) ◽  
pp. 4005-4015
Author(s):  
Shangzhi Pan ◽  
John C.W. Lam ◽  
Praveen Jain
Keyword(s):  
Power Factor ◽  
High Power ◽  
Single Stage ◽  
High Power Factor ◽  
Driving Circuit

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.

Sign in / Sign up

Export Citation Format

Share Document