In recent years the field of wireless charging has seen remarkable developments. More and more devices like mobile phones and laptops can be charged wirelessly, and larger equipment like electric vehicles are likely to follow the same path. The air gaps over which the power can be transferred keeps increasing, as do the
amount of power that can be transferred and the power transfer efficiency. Though combining these three key requirements has turned out to be a problem, since there always seems to be a trade off. This thesis will focus on the design process and the result of a wireless charger for hand held devices like mobile phones. This thesis will only describe the receiver side of the wireless power transfer system. The requirements were an output of 5V at 5W, over an as large as possible air gap with an efficiency of at least 60%. After the complete circuit had been designed and assembled an efficiency of 67.8% at a distance of 2.5cm had been obtained, which satisfies the requirements.