This paper proposes a high-efficiency LED driver system powered by photovoltaic (PV) energy, designed to operate under variable irradiance conditions with optimized power conversion. The system integrates a high-frequency Series Resonant Inverter (SRI) controlled by Pulse Density Modulation (PDM), enabling soft switching through zero-voltage and zero-current conditions. A 2.2 kW PV array serves as the energy source, and maximum power point tracking (MPPT) is achieved via a Perturb and Observe (P&O)-based algorithm. This controller simultaneously manages MPPT and inverter operation by adjusting the pulse density in real time according to the irradiance level. To improve system performance,the study implements and compares three modulation strategies: conventional irregular PDM, Enhanced PDM (EPDM), and Improved PDM (IPDM). All methods are developed and simulated in the PSIM environment, using non-ideal parameters to replicate real-world conditions. Simulation results indicate that the proposed control strategies achieve over 99 % efficiency across varying power levels, with IPDM demonstrating the lowest harmonic distortion and resonance current ripple. These results confirm that the proposed PDM-based control approach offers a robust and energy-efficient solution for PV-powered LED drivers, particularly in off-grid or energy-constrained environments.
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• LED
• PV system
• energy efficiency
• PDM
• resonant converter
• soft switching