Analysis and Control of Electrolytic Capacitor-Less LED Driver Based on Harmonic Injection Technique
Abstract
:1. Introduction
- Using additional control loop circuit to inject harmonics increases the component count. Consequently, the LED lamp cost will increase, limiting its penetration to the market, especially in the case of single-stage solution.
- The best practical result is a PTAR of 1.43 in nominal conditions which is still a high value.
- Using an inaccurate model of the LED chip (i.e., replacing it by a simple resistor), leads to a deviation between the practical results and mathematical ones.
2. Modelling of E-Cap-Less Converter for LED Applications
2.1. Period 1: ( ≤ t ≤ )
2.2. Period 2: ( and )
3. Modeling of Proposed E-Cap Less Converter under Harmonic Injection
3.1. LED Output/Input Currents’ Harmonics Relations
3.2. Designed Operating Regions under Target PF and PTAR
4. Proposed Control Circuit and Simple Implementation
5. Case Study
- Nominal input voltage
- Line frequency
- Output voltage .
- Average output power .
- Output current .
- Switching frequency
- Input filter capacitor
- Input filter inductor
- Output filter capacitor
- Output filter inductor
- Series inductor with LED
5.1. Determination of the Targeted Injected Harmonics’ Order Values
5.2. Design Control Values for Single Multifunction Block (SMFB)
- Integrator for regulation purpose.
- One zero at a frequency lower than one tenth of twice the line frequency to flat the gain and keep the phase angle to zero.
- One pole between the last injected harmonic (>500 Hz, in this case) and one tenth of the switching frequency to filter undesired high frequency harmonics.
6. Simulation & Experimental Results
7. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Harmonics | Case I | Case II | Case III | Case IV | Case V |
---|---|---|---|---|---|
PF | 0.983 | 0.979 | 0.963 | 0.9163 | 0.90 |
PTAR | 2.28 | 1.713 | 1.541 | 1.431 | 1.41 |
Component | R1 | R2 | C1 | C2 |
---|---|---|---|---|
Value | 100 k Ω | 200 k Ω | 1 uF | 220 pF |
Circuit | PTAR Mathematical | PTAR Experimental | Control Circuit Component Count | No. Control Loops | ||
---|---|---|---|---|---|---|
Op-Amp | Multiplier | Divider | ||||
[10] | 1.34 | 1.43 | 4 | 1 | 1 | 2 |
Proposed | 1.41 | 1.41 | 2 | - | - | 1 |
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Nassary, M.; Orabi, M.; Arias, M.; Ahmed, E.M.; Hasaneen, E.-S. Analysis and Control of Electrolytic Capacitor-Less LED Driver Based on Harmonic Injection Technique. Energies 2018, 11, 3030. https://doi.org/10.3390/en11113030
Nassary M, Orabi M, Arias M, Ahmed EM, Hasaneen E-S. Analysis and Control of Electrolytic Capacitor-Less LED Driver Based on Harmonic Injection Technique. Energies. 2018; 11(11):3030. https://doi.org/10.3390/en11113030
Chicago/Turabian StyleNassary, Mahmoud, Mohamed Orabi, Manuel Arias, Emad M. Ahmed, and El-Sayed Hasaneen. 2018. "Analysis and Control of Electrolytic Capacitor-Less LED Driver Based on Harmonic Injection Technique" Energies 11, no. 11: 3030. https://doi.org/10.3390/en11113030