Electrical Engineering Department
BS in Electrical Engineering
Electronic devices are a part of all modern homes, but restricted by available outlets and the hassle of wires. With the modern wireless mouse, this is also the case. When the battery is low the consumer has several options: it is replaced with a new battery, it can be recharged using a USB wire, or the mouse is placed on a charging dock. This project provides an alternative to these options and allows the mouse’s battery to be charged via wireless inductive coupling. The wireless power charging system that was implemented in this project was successful in its ability to utilize close proximity inductive coupling to charge the battery of a wireless mouse. A 5.0V input representing the voltage of a USB port was inverted using a push pull oscillator circuit. A sinusoidal 27.9Vpk-pk signal across the primary coil at 10.9 Mhz was achieved. A 40.2Vpk-pk sinusoidal voltage at 8.21Mhz on the receiver coil is successfully rectified to a DC voltage of 8.0V. However, the maximum efficiency achieved with a battery load is a mere 0.80%, and only 5.98% with no load. The internal resistance of the battery heavily loads the rectifier and drops Vout to 0.2V. Other reasons for such a low efficiency as well as recommendations to improve the system will be discussed in this report.