Basic study of magnetic resonance coupling-based distance sensor with adjustable sensing range using active quality factor control

Recently, various types of mobile robots have clearly gained attention and some are readily available. In response to this, the authors have been studying on the system which provides both power and self-position : the essential quantities for the mobile robot, by single non-restraint device. The proposed system realized the wireless power transmission and position sensing simultaneously using magnetic resonance coupling. However, due to the fact that sensing range depends on the fixed quality factor of antenna, the narrow sensing range of the current system was a problem in the practical use. Therefore, the authors are considering a new approach which enables the control of the sensing range by active quality factor control. In this paper, the system configuration, basic theories and circuit analysis results of the active quality factor control approach are introduced.