scholarly journals Novel Interleaved Single-Stage AC/DC Converter with a High Power Factor and High Efficiency

2011 ◽  
Vol 11 (3) ◽  
pp. 245-255 ◽  
Author(s):  
Yijie Wang ◽  
Wei Wang ◽  
Xiangjun Zhang ◽  
Dianguo Xu
Keyword(s):  
Power Factor ◽  
High Power ◽  
High Efficiency ◽  
Single Stage ◽  
High Power Factor

A single-stage high efficiency high power factor LED driver

2009 ◽  
Author(s):  
Shih-Jen Cheng ◽  
Yeong-Chang Yan ◽  
Ching-Chun Chuang ◽  
Huang-Jen Chiu ◽  
Yu-Kang Lo ◽  
...  
Keyword(s):  
Power Factor ◽  
High Power ◽  
High Efficiency ◽  
Single Stage ◽  
Led Driver ◽  
High Power Factor

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.

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