This study was carried out to investigate the near-field method of wireless power transmission using inductive coupling. The problem addressed was the limitations of traditional wired power transmission systems, which reduce device mobility, introduce safety hazards, and contribute to mechanical wear due to constant physical contact and handling. To solve this, a system was designed and constructed to wirelessly transfer power over a short distance of 20cm by generating a magnetic field through a transmitter coil and capturing the field at the receiver coil. The project involved the development of a prototype system comprising transmitter and receiver modules, with the transmitter powered by a DC supply and configured to produce high-frequency AC signals. These signals were transmitted through the magnetic field generated by the coil. Measurements were taken at various distances between the coils, and obstacles of different materials such as wood, plastic, glass, and metal were placed between the transmitter and receiver to examine their effects on the transmitted power. Key electrical parameters such as voltage, current, and power were recorded under each condition, and the data were presented in tables and graphs. Performance data were collected at distance interval of 2cm, ranging from 0-20cm. In both mobile charging and LED applications, the power delivered decreased progressively as the distance increased. At the shortest distance of 0-2cm, the output power was highest e.g. 0.11W for mobile charging and 0.18W for LED illumination. But it dropped significantly to as low as 0.00081W and 0.00035W at 20cm respectively. The findings revealed that power transfer was efficient at short distances but significantly reduced as the separation increased or when metallic obstacles were introduced. For example, while the voltage without an obstacle 3.5V at 0-2cm, it dropped to 2.2V in the presence of metal barrier. At 20cm, the effect was even more significant with the voltage dropping to as low as 0.1V. The study demonstrated the viability of near-field inductive coupling for wireless power transfer within limited ranges and controlled environments. The results suggest potential applications in charging small electronic devices and sensors without physical connectors, with implications for cheaper, safer, and more flexible energy delivery systems.
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