Wireless power transfer has been around for a long time. In 1899 Nikola Tesla demonstrated that it was possible to transfer power using a pair of coils. This technology has advanced to now charge a wide range of portable devices, such as phones. In this thesis, a wireless charging system is designed to be integrated into a power bank with UV-C sterilization to charge phones.

The design focuses on creating a small and highly efficient module to transfer energy from the power bank battery to the phone with as little losses as possible. The design adheres to the Qi standard from the Wireless Power Consortium by following the MP-A2 reference design. The design consists of a voltage regulator to provide a constant voltage, a controlled inverter that manages output power, and a series compensated transmitter coil. LTspice simulations predict the power efficiency to be 74% from the battery to the receiver. A prototype PCB was designed and assembled to demonstrate the performance of the design in practice and transferred 5W at an efficiency of 67%. This shows potential for future integration of the design into the power bank.