Palm Size Charging Platform With Uniform Wireless Power Transfer

In this paper, the design of wireless inductive charger for portable electronic devices is present. There are two main parts have been included. The first part is the exciting circuit in which to provide sufficient input power to the primary charging platform. The exciting circuit is comprised by oscillator circuit and power amplifier circuit. Both of the two circuits have been simulated in software and verified by measurements. The second part is a two layer near uniform field planar inductive platform (primary coil). The design of the charging platform consists of two layers of square spirals overlapping each other using the principle of superposition. The strong areas (peaks) of one layer are superposition onto the weak areas (troughs) of the other layer. In this manner, a near uniform magnetic field suitable for power and signal transfer is created.