Multiphase WPT-system based on phase shifted resonant topologies

To improve power density of a primary system, several different ways to reach to goal are possible. On way to do it, is to increase the primary phases up to a decent number. Increasing the number of primary coils has much advantageous compared to a single phase topology such as increased power density and lower flux density at the outskirts. An overview how to describe this advanced topology will be introduced after a brief overview over the state of the art. In addition to the basic operation, a method how to switch a numerous of primary sides in series will also discussed.