研究目的
To propose a simple and effective equivalent circuit able to model the current drawn from the LED bulbs, accounting for the current waveform variation in case of variability of the voltage on the mains.
研究成果
The proposed equivalent circuit model of LED lamp effectively accounts for current waveform variation due to mains voltage variability, showing excellent matching between measured and simulated currents. This model is a useful tool for lighting system designers to predict harmonic injection on the mains.
研究不足
The model does not account for phase offset variation of each harmonic as a consequence of voltage network variations and uses a linear interpolation which may not capture all nonlinear behaviors.
1：Experimental Design and Method Selection:
The study involves testing different LED lamps under variable supply voltage to model their nonlinear behavior. A linear interpolation method is used to estimate the total current waveform based on the amplitude of each harmonic current as a function of the voltage on the main.
2：Sample Selection and Data Sources:
Several LED lamps from different manufacturers were tested under varying voltage conditions (195.5V, 207.0V, 218.5V, 230.0V, 241.5V, and 253.0V).
3：5V, 0V, 5V, 0V, 5V, and 0V).
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: A transformer with continuous variable transform ratio (variac) was used to set different input voltages. A power analyzer and an oscilloscope were used for measurements.
4：Experimental Procedures and Operational Workflow:
The lamps were tested at different voltage levels to measure the active and nonactive power, and the amplitudes and phase offset of current harmonic components.
5：Data Analysis Methods:
The data was analyzed using PSpice simulations to compare with experimental measurements, focusing on the linear interpolation of harmonic current amplitudes.
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