A Systematic Design Flow for Wireless Power Transfer System

The design process of a wireless power transfer system can be complicated, with the considerations of the physical constraints, efficiency change over the operating coupling range, the switching frequency and the thermal reliability. This manuscript shows a systematic design flow of an inductive power transfer system based on a real-world application. A design process of a 100 W wireless charger for laptop is demonstrated, with both electromagnetic and spice circuit simulation. In order for the system to work reliably, a thermal analysis is also included to determine the dimension of a typical heat sink for this system to operate under reasonable temperature.