Small size band pass filter and series-series (BF-SS) topology for suppressing electromagnetic interference (EMI) and application to digital TV wireless power transfer (WPT) system

Abstract

we observed significant reduction in the $3^{rd}$, $5^{th}$ and $7^{th}$ Rx current harmonics using BF-SS topology maintaining 150W load power. This reduction of odd order Rx current harmonic reduces EMI interference.

In the case of DTV, high-frequency harmonics are generated from digital integrated circuits. This harmonics transmit through the package and PCB layout, and couple with sensitive circuits such as the radio frequency (RF) receiver. As a result, such couplings induce the instability or the performance degradation of the RF receiver in the DTV. So here I have studied series-series (SS) topology and designed a small band pass filter with 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, 139 kHz operational frequency, and $R_L$ 70 Ω