Development of wireless electricity transmission through resonant coupling

Abstract

Wireless electricity transmission is the transmission of electrical energy from a power source to an electrical load without using any wires. Nowadays, the wireless power transmission technology is widely used in the mobile, industrial and medical area. The technology of the wireless power transmission can eliminate the use of the wires and batteries. Thus it is so convenient and safe for all users. Wireless power transmission can be carried out by many methods, but the most common way seen was inductive coupling and resonant coupling which was recently developed. This paper involves the design and development of wireless power transmission hardware. A wireless power system consists of a transmitter (primary coil) and a receiver (secondary coil). An alternating current is passed through the primary coil and a magnetic field was generated. The secondary coil is then placed near to the primary coil. The primary coil and secondary coil are magnetically coupled when the two devices make contact and therefore the power transfer from the transmitter to the receiver. Test and analysis are done on how to develop the wireless electricity transmission through resonant coupling by varying the different wire diameters, number of coils and coil diameters of the primary and secondary of the coils. The output power and maximum distance are then analyzed based on the varying characteristics. As a conclusion, the best result to obtain the maximum output power is 0.55 mm wire with diameter 6.5 cm coil.