Variable-phase contactless energy transfer desktop part I: Design

In this paper, the design of a variable-phase contactless energy transfer desktop is presented. The CET desktop has the ability to power and recharge small electronic devices, such as cellular phones, music- and multimedia players, PDApsilas and laptops lying on its surface. As the devices are placed on the table, power is transferred through the mutual inductance between their respective embedded windings. Furthermore, by altering the primary windingspsila current phases, it is shown that the stray magnetic field is reduced without affecting the power transfer. This work focuses on the design of the variable-phase contactless energy transfer desktop starting with the theory of operation, optimization of the windings and solving the power transfer equations to comply with the presented system specifications. Thereafter, the variable-phase operations are explained and the implementation of the system shortly discussed. Finally, power transfer simulations are compared against the measured results from the implemented system. The measurements and calculated results show excellent agreement.