A High Power Factor LED Driver with Intrinsic Current Balancing Capability
Abstract
:1. Introduction
2. Analysis of the Proposed LED Driver Circuit
- All components are considered ideal;
- The leakage inductance of T1 and T2 is negligible in comparison to the magnetizing inductance;
- The switching frequency (fs) of S1 and S2 is far higher than fL, thus, Vin is considered constant in a high-frequency period;
- The capacitances Cdc and Co1–Co4 are large enough so that the voltages across them (Vdc, Vo1–Vo4) are constant at steady-state operation;
- The current of each LED string is equal. (ILED1 = ILED2 = ILED3 = ILED4 = ILED).
2.1. Mode I ()
2.2. Mode II ()
2.3. Mode III ()
2.4. Mode IV ()
2.5. Mode V ()
2.6. Mode VI ()
3. Mathematical Equations for Parameters Design
3.1. Flyback-Typed Power-Factor Correction Circuit
3.2. Class-D Series Resonant Converter
4. Circuit Design and Experimental Results
4.1. Parameters Design
4.1.1. Parameters of the Flyback Converter
4.1.2. Parameters of the Resonant Converter
- Step 1 Calculate Ir,rms.
- Step 2 Calculate V1,rms and Vo1,rms.
- Step 3 Calculate Ro,equ and Xs.
- Step 4 Determine QL and Calculate Lr and Cr.
4.2. Experimental Results
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Vin | 110 V ± 10% (rms), 60 Hz |
PLED | 72 W (24 × 3 W) |
VLED | 23.1 V (6 × 3.85 V) |
ILED | 0.78 A |
fs | 50 kHz |
D | 0.45 |
T1 turns ratio n | 2 |
DC-link Voltage Vdc | 100 V |
Inductor Lf | 0.5 mH |
Capacitor Cf | 2 μF |
T1 primary inductance L1 | 0.306 mH |
Capacitances Cdc, Co1–Co4 | 100 μF |
Resonant Inductance Lr | 0.083 mH |
Resonant Capacitance Cr | 220 nF |
Active switches S1, S2, | SPW47N60C3 |
Diodes Dr1~Dr4, D1~D3, Do1~Do4 | MUR460 |
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Cheng, H.-L.; Hung, Y.-C. A High Power Factor LED Driver with Intrinsic Current Balancing Capability. Appl. Sci. 2023, 13, 6879. https://doi.org/10.3390/app13126879
Cheng H-L, Hung Y-C. A High Power Factor LED Driver with Intrinsic Current Balancing Capability. Applied Sciences. 2023; 13(12):6879. https://doi.org/10.3390/app13126879
Chicago/Turabian StyleCheng, Hung-Liang, and Yi-Chan Hung. 2023. "A High Power Factor LED Driver with Intrinsic Current Balancing Capability" Applied Sciences 13, no. 12: 6879. https://doi.org/10.3390/app13126879
APA StyleCheng, H.-L., & Hung, Y.-C. (2023). A High Power Factor LED Driver with Intrinsic Current Balancing Capability. Applied Sciences, 13(12), 6879. https://doi.org/10.3390/app13126879