Wireless charging from direct current source using magnetic resonance

Abstract

This research presents a wireless AC-to-DC low power transfer over a distance. The distance of remotely located targets from the transmitter coil and receiver coil which has the load is the major concern in these applications. The transmitter and receiver circuits are constructed. Two inductively coupled coils are designed and used in both transmitter and receiver. Through experiments, it was observed that with such a design, the power transfer has a limited range, and the range will be smaller for smaller receiving coils and improper alignment. It was also observed that the output voltage increased correspondingly with an inc easing number of turns and coil diameter and good output voltage is harvested with the optimized transmitter circuit resistance 340 Ω and is 12 VDC. Experiment results showed that the system could transmit at a distance of 35 inches with an output load voltage of 3 VDC.