Development Of Capacitive Power Transfer For Rotary Applications

Mamat, Nurul Nabila (2018) Development Of Capacitive Power Transfer For Rotary Applications. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Wireless power transfer (WPT), through the transmission of contactless energy, is not only being used for charging batteries in mobile devices, but it is also being increasingly used in the field of industrial applications. WPT by using capacitive approach (CPT) is introduced to enhance the convenience to the user. The proposed technique eliminates the use of connecting wire. A 10Watt wireless rotary CPT system is developed for applications having rotating parts such as a robot arm. To be specific, the capacitive based approach is utilized in this work because of its ability to transmit power through metal and in a metal surrounding environment where the inductive-based approach failed to perform. The project focuses on the coupling study of a rotary CPT application where the power supply is stationary while the load rotates and therefore allows the load to rotate 360 degrees free rotation. The Class E MOSFET power inverter is used in this project due to its ability to achieve high efficiency compared to other class of converters at high frequency. The prototype of the CPT for rotary application has also been successfully developed with disk plate thickness of 1mm-2mm. Overall, the developed CPT system for rotary application is able to deliver 5.5Watt with 83.33% efficiency. To enhance the power efficiency and ZVS conditions, a self-tuning circuit using phased-locked-loop has been proposed in this project. The efficiency of the simulation Class E without the self-tuning circuit is 96.83%. After the self-tuning circuit is added to transmitter part, the efficiency of the simulation is increased to 97%.

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