Various methods were developed for maximum power point tracking of the CPT system, our work follows a new approach of finding impedance characteristics for a certain range of frequencies. Considering the drone battery as an application, a single active switch Class-E2 resonant converter with circular coupling plates is utilized. Impedance characteristics are plotted with the help of equations related to input and resonant impedance. And the impedance tracking is laid out for various resonant inductors, the difference in current peak is noticed for each case. Simulations verify and provide additional information on the reactive type. Hardware tests also provide the variation of input impedance by means of input current, and output voltage for a range of frequencies. The efficiency at optimal impedance points for resonant inductor 50 μH and 100 μH are noted. Efficiency for a resonant inductor with 50 μH has 3 % higher compared to the CPT with a 100 μH resonant inductor. Further hardware tests were performed to investigate the impact of frequency and duty cycle variation. Zero-voltage-switching (ZVS) limits is also discussed with respect to both frequency and duty cycle.
Yashwanth Bezawada is a Ph.D. candidate from the Electrical & Computer Engineering Department at Old Dominion University. He is working in the power research lab under Dr. Yucheng Zhang. He received his bachelor's in ECE from Malla Reddy Institute of Technology & Science in 2014. Later he received a master's in ECE from Old Dominion University in 2017. His area of research is in the power electronics/power systems domain. Previously he worked on high power DC-DC power converter. Currently, his work focuses on wireless power transfer using capacitive coupling plates.