Ryo Matsumoto (currently 1st year PhD student) and Professor Hiroshi Fujimoto from the Fujimoto-Shimizu-Fujita Laboratory, Department of Advanced Energy Engineering, received the Best paper awards 1st prize at the IEEE Wireless Power Week Conference (WPW 2022) held in Bordeaux, France, 5-8 July 2022.
The conference is the world's largest international conference on wireless power transmission technology, and the prize is awarded to the best paper presented.

Title：
Adaptive Compensation Scheme for Wireless Power Transfer Systems with Coil Inductance Variation Using PWM-Controlled Switched Capacitor
Authors：Ryo Matsumoto, Hiroshi Fujimoto

This presentation proposed a new variable capacitor control scheme for wireless power transfer (WPT) using magnetic resonance coupling.
WPT systems have the characteristic of transmitting power using the resonance phenomenon of a circuit with a compensating capacitor, but changes in the self-inductance of the transmitting and receiving coils due to misalignment of the coils or manufacturing errors can cause resonance misalignment, which can result in unstable power and efficiency.
To solve this problem, authors analysed the impact of self-inductance fluctuations on power in WPT systems and proposed a control method for variable capacitors that does not require wireless communication between the transmitter and receiver to compensate for this impact.

Comment from Ryo Matsumoto：
I have been researching resonance frequency control of wireless power transfer using variable capacitors since I was an undergraduate student, and I am very honoured to have received this award for my work. 
I would like to thank Professor Fujimoto, Mr. Shimizu, Mr. Fujita, Mr. Nagai and my seniors, classmates and juniors in the laboratory for their guidance on a daily basis.
I will use this award as a basis for further research in the future.