  A new multi-device wireless power transfer scheme that reduces the overall
charging time is presented. The proposed scheme employs the intermediated
energy storage (IES) circuit which consists of a constant power driving circuit
and a super-capacitor. By utilizing the characteristic of high power density of
the super-capacitor, the receiver can receive and store the energy in short
duration and supply to the battery for long time. This enables the overlap of
charging duration between all receivers. As a result, the overall charging time
can be reduced.
