Abstract
Wireless power transfer (WPT) transmits electrical energy from a power source to an electrical load wirelessly or without any conductors. The capability of WPT to transmit the energy is limited. Therefore, a relay was introduced to increase the distance of the WPT capabilities. The effect of the relay has been investigated to extend the energy transfer distance. The effect of relay was demonstrated by placing a relay coil between transmitter and receiver, relay biased to transmitter and placing two relay coils in the designed system. Experimental results are provided to prove the concept of the relay effect. The power transmission efficiency can be achieved up to 75% at 1 meter distance.
Highlights
The concept of Wireless Power Transfer (WPT) has been introduced over the century and this technology is gaining more advances in wireless charging especially in portable consumer electronic devices, medical and industrial devices
The mid-range WPT system was designed to be applied in small device applications
Relay coil was inserted between Tx and Rx coils to extend the power transfer distance of the system
Summary
The concept of Wireless Power Transfer (WPT) has been introduced over the century and this technology is gaining more advances in wireless charging especially in portable consumer electronic devices, medical and industrial devices. The capability of transmission power distance in WPT system is relatively short due to the effect of magnetic resonance coupling. The transmission power at a longer distance can be enhanced by placing a relay coil (resonator) between the transmitter (Tx) and receiver (Rx). The resonator will receive magnetic field from the transmitter and sending the magnetic field to the receiver This concept is able to enhance the transmission power at a longer distance [2]. By placing a relay coil between Tx and Rx coils, longer distance for the power transmission process can be achieved [5], [6]. The relay resonator is proposed to enhance the transmission distance and improve the power efficiency to increase the performance of the WPT system. Comparison is made between each methods that has been proposed with the typical WPT system
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