Wireless Power Transfer Technology Using Resonant Technique

Wireless power transfer (WPT) is a kind of technology by transferring the electrical energy from a power source to an electrical load without the use of wire or conductor. Nowadays, electricity power is very important in our daily life. People use portable electronic devices to improve their routine work. The portable electronic devices are connected to power socket for their power supply. However, it is not convenient to people due to the length of the wire and they are unable to move far from the power socket. Therefore, the main objective of this project is to investigate a wireless power transfer technology using resonant technique. The proposed model was designed and pre-tested by Multisim. An efficient and compact wireless power transfer using resonant technique was proposed and a wireless power supply system for low power electronic devices was developed. The design of the system is to transfer the low power for electronic devices from transmitter to receiver coils. The input DC power is 12 V and the magnetic field passes through resonator and causes the energy to build up. As the result, the voltage and current of LED (acts as load) are 0.668 V and 0.01 mA respectively with the distance of 5 cm. In order to smoothen the peak voltages, a capacitor and a diode were used as a filter and rectifier respectively in the circuit. Resonance inductive coupling is widely used for mid-range transmission distance due to its simplicity in system design. The optimum distance for harvesting the highest voltage is 3.5 cm apart. The efficiency of power transmitted was 41.6 %. The transmission of power is only affected by the metal made component which is placed near to it. Wireless power transfer is convenient, reliable, low cost, safer and environmentally sound. In conclusion, the wireless power transfer using resonance induction coupling is more efficient if compared with inductive coupling and electromagnetic wave. The power can transfer with a longer distance and safely by using this technique.