Development of Wireless Power Transfer using Inductive Approach to Power Up Multiple Low Power Devices

Wireless power transfer (WPT) is a technology that implements non-contact power transmission within a distance. There are three types of wireless power transfer, which are inductive power transfer (IPT), capacitive power transfer (CPT), and acoustic power transfer (APT). Among these three types of wireless power transfer, the inductive power transfer has advantages in term of the transmission distance and high efficiency. Therefore, we focused on the inductive power transfer to develop a wireless charging to power up multiple low power devices. In this work, we implemented the IPT method to power up multiple devices on the office table. This IPT system enabled the power transmission from the office table to the several loads that has been attached together with the receiver coil. Hence, electronic appliances such as table clock and desk lamp (used in this work) will operate without using a wire to get a power source from power outlet or a battery. To be more specific, in this work, a high efficiency Class-E converter was designed to convert the DC source into AC. Through this, the efficiency of the system can be improved. Finally, the developed prototype was able to power up desk lamp and digital clock wirelessly with 70% efficiency. The performances analysis of the developed prototype is discussed and the future recommendation of this technique is also presented in this pape