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| Content Provider | IET Digital Library |
|---|---|
| Author | Abdelmessih, Guirguis Z. Alonso, José Marcos Costa, Marco A. Dalla |
| Abstract | This study presents a high power factor (PF) light-emitting diode (LED) driver featuring a pulse width modulation (PWM) dimming technique. The integrated buck-flyback-buck converter (IBFBC) is built by connecting a buck converter to the integrated buck-flyback converter's output. The IBFBC ensures a constant output current regulation as well as high PF at all dimming ratios. The purpose of the output buck converter is to clear up the discontinuous power operation created by the PWM dimming. This occurs when the buck converter absorbs the output power, at LED switched-off, and sends it back to the input. Thus, the IBFBC maintains the operational enhancement shown by the hybrid-series-parallel (HSP)-PWM technique, ensuring greater efficiency. This study explains the operating principles of the IBFBC using circuit diagrams as well as an average model for the entire converter. Moreover, the study presents a mathematical analysis of the IBFBC power flow. It provides guidance on how to select the optimum value for the output buck inductance. A 230 V, 50 Hz input, 160 V output, 100 W AC–DC converter operating at 100 kHz has been implemented. The prototype is fully tested to demonstrate the active HSP-PWM technique. An efficiency ranging 50–86% corresponding to the dimming ratio of 5–100% is reached, where 5% dimming refers to an output power of 4 W. |
| Starting Page | 1697 |
| Ending Page | 1705 |
| Page Count | 9 |
| ISSN | 17554535 |
| Volume Number | 12 |
| e-ISSN | 17554543 |
| Issue Number | Issue 7, Jun (2019) |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/iet-pel/12/7 |
| Journal | IET Power Electronics |
| Publisher Date | 2019-02-26 |
| Access Restriction | Open |
| Rights Holder | © The Institution of Engineering and Technology |
| Subject Keyword | AC-DC Power Converter Active HSP-PWM Technique Active Hybrid-series-parallel PWM Dimming Scheme AC–DC Converter Operating Constant Output Current Regulation Control of Electric Power System Current Control Dimming Ratio Dimming Ratios Discontinuous Power Operation Driver Circuit Electric Current Control Entire Converter Frequency 100.0 KHz Frequency 50.0 Hz Greater Efficiency High PF Light-emitting Diode Driver High-efficient Off-line LED Driver Hybrid-series-parallel-PWM Technique IBFBC Power Flow Integrated Buck-flyback-buck Converter Light Emitting Diode Lighting Lighting Control Mathematical Analysis Operating Principles Operational Enhancement Output Buck Converter Output Buck Inductance Output Power Power 100 W Power 4.0 W Power Electronics Power Factor Correction Power Supply Pulse Width Modulation Dimming Technique PWM Dimming PWM Power Converter Supervisory Circuit Switching Converter Voltage 160.0 V Voltage 230.0 V |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electrical and Electronic Engineering |
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