SSRG International Journal of Mechanical Engineering (SSRG-IJME) – Volume 7 Issue 3–March 2020 ISSN: 2348 – 8360 www.internationaljournalssrg.org Page 5 Designing and Analysis of an Optimal Capacitive Power System Using Class-E Power Amplifier Abtulgalip Karabulut #1 , Oguzhan Dogan *2 , Serhan Ozdemir #3 # Mechanical Engineering Department & İzmir Institute of Technology Republic of Turkey Abstract The main idea of this study is to design a high efficient capacitive power transfer (CPT) system which consists of a load network, a series resonance L-C circuit and MOSFET. The MOSFET was used as a switch with 0.5 duty cycle. The system consists of two main parts which are the CPT system and E- class power amplifier circuit design. In order increase, the efficiency of wireless power transfer system E-class Power amplifier was used. The power telemetry has been realized by the copper capacitive plates with 100 cm2 surface area. The efficiency of the CPT system is 82.1%. Throughput and input power of the system are 4.99 W and 4.1 W, respectively. Also, the switching performance of the E-class power amplifier circuit has been analysed at 1.7 MHz frequency. The circuit was operated at its resonance frequency to increase the efficiency. Finally, the capacitive power transfer system has been designed with 81.2% efficiency at 1.7 MHz frequency and high SNR. Keywords — Capacitive power transfer, Class-E power amplifier, Wireless data and power transfer I. INTRODUCTION Electricity has been one of the main components of human life. Electricity was often tried to transmit over cables. Therefore cables were also an important member of power transmission. However, due to the current cable links, the power supply of modern automation systems has been a classic difficulty [1]. As well as, cable connection systems have many drawbacks, such as limitation of the transmitting distance, power loss, cost etc. The same can be said quite well for transmitting data. Particularly, cable links cannot be smoothly assembled on a rotating mechanical system. On the other hand, wireless Power Transfer (WPT) offers robustness and efficient solutions to those pitfalls that were addressed. Wireless power transfer method is an emerging field of research which extends to Maxwell [2]. James Clerk Maxwell realized the first theoretical approach to wireless communication between 1861-1862 years [3]. Nikola Tesla was the first man to conduct experiments at WPT at the end of the 19th century [4]. Today, wireless power transfer (WPT) technology has grown in popularity for its user- friendliness, compact nature and respective transmission distance etc. While the facets of WPT are being studied, several approaches have emerged. The WPT technology can be investigated under two main categories which are radiative and non- radiative [5]. Microwave power transmission [6] (MPT), laser power transmission [7], are among those radiative methods, respectively. Radiative WPT techniques may be used for wireless power transfer system up to air gap ranges greater than a few kilometres. High performance is also not difficult to achieve. However, it is very dangerous for the living organism [8]. Coupled magnetic resonance power transfer (CMRPT) [9], inductive power transfer (IPT) [10] and capacitive coupling [11] are among the non- radiative WPT methods. It is possible to obtain the high-efficiency with Non-radiative WPT techniques under short distance [12]. Coupled magnetic resonance transmission technique utilizes coils to transfer the power via resonance. CMRPT method provides many benefits, e.g. under long-distance power transfer. Notwithstanding, Due to a high degree of electromagnetic interference (EMI), Coupled magnetic resonance technology could not be commercialized [13]. EMI exposure can negatively affect the performance of the electronic system, as well as human health. When, the non- radiative WPT methods are debated, inductive and capacitive power transfer systems show themselves. IPT is the most famous, commercial wireless systems in the literature. The IPT system wirelessly transfers electrical power from millimetres to a single meter [14]. Throughout the industry, IPT is commonly used for power transmission or wireless charging [15] [16]. IPT and CMRPT techniques utilize from the magnetic flux to transmit power or data wirelessly. Generally, inductors generate the EMI while power is transferred. EMI could theoretically interfere with the stability of artificial intelligent systems. Also, it is impossible to transfer power and datum at the same frequency using coils [17]. Unlike CMRPT and IPT systems, electric flux is operated between two coupled foil surfaces in the CPT technology. CPT technology utilized from parallel plates instead of coils core. These features make CPT technology attractive for wireless power and data application.