Study of Series-series Topology for Suppressing Electromagnetic Interference (EMI) for Digital TV Wireless Power Transfer (WPT) Systems

Abstract

In this paper, we have studied series-series (SS) topology and designed a band pass filter modified series-series (BF-SS) topology to reduce the electromagnetic interference (EMI) for a digital television (DTV) wireless power transfer (WPT) systems. The EMI is one of the most important and serious issue for the package system which degrades the performances of the electronic devices. The modified topology consists of a band pass filter in parallel and series of a load resistance (RL) and a capacitance (C), respectively of a receiving (Rx) coil. Amalgamating the advantages of series-series topology, high efficiency in a small load system, and a band pass filter, filtering frequencies of useful range, our BF-SS topology has shown promising results in reducing EMI. By keeping 30 cm distance between a transmitting (Tx) coil and a Rx coil, 0.1 coupling coefficient, 145 kHz operational frequency, and RL 70 O; we observed significant reduction in the 3rd, 5th and 7th Rx current harmonics using BF-SS topology by 6.93 dB, 17.05 dB and 17.23 dB respectively maintaining 150W load power. Moreover, we observed high coil to coil power transfer efficiency (PTE) of 96.03 % through BF-SS topology. This reduction of 3rd, 5th and 7th Rx current harmonic reduces EMI interference.