This paper presents a methodology and system
architecture to supply power over mid-distance, in the context
of bio-sensors for long-term vital monitoring purposes. The first
part of the paper introduces a novel non-coupling coil array
system with a beamforming-control algorithm to enhance the
power transfer efficiency, up to 25cm distance, regardless of
the receiver’s position. In the second part an on-chip wireless
power charger system with high efficiency and trimming function
to charge the mAh-level NiMH battery and provide stabilized
power supply to devices, is presented. Overall, the system achieves
0.74% power efficiency at a distance of up to 25cm (with 0.86%
from the beamforming-control power transfer system and 86%
from the wireless power charger system).