Performance Analysis of Mobile Phone Chargers Under Different Charging Loads: Power Quality for Sustainable Charging and Future Prospects

The low-power switched-mode chargers used to power mobile phones can cause power quality issues when installed in large numbers. In this study, there were five anonymized mobile phones (M1-M5) and three anonymized adapters (Charger 1: 18W, Charger 2: 33W, Charger 3: 45W). The number of 15 operating points were analyzed based on the input current total harmonic distortion (〖THD〗_i), power factor (PF), RMS current and active power. Mean 〖THD〗_iincreased from 119.02% for Charger 1 to 148.08% for Charger 2 and 162.98% for Charger 3, whereas mean PF decreased from 0.6146 to 0.5526 and 0.5070, respectively. In all observations, there was a strong inverse relationship between 〖THD〗_i and PF (r = -0.974, p < 0.001). The results show a power quality problem while the phone dependent operation and part load operation, but lack of topology and protocol information makes causal generalization and compliance classification impossible. The results inspire the load-aware design of chargers, low loss current shaping, clear power-quality reporting, and standardized full cycle measurements for sustainable charging.