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Wireless power supply for a PC mouse

Introduction

This is an idea that I’ve been bearing in my mind for a while since I’ve got interested in wireless power, and finally realized it as my undergraduate final year project. As result, I’ve did extensive research that resulted in some satisfying conclusions and 60 pages worth of documentation (Croatian only, unfortunately). I saved this idea for a college project since it was relatively simple and pretty certain to work in very limited time I had, while yet satisfyingly innovative and interesting.

The idea originated from search for possible applications of wireless power where it could actually permanently replace batteries and other power sources, instead of just being supplemental, such as in the commonly advertised application of battery charging. PC peripherals turned out to be excellent playground for this concept – they are mostly static, always used in the vicinity of power source (PC). They are also pretty much always used in closely spaced parallel planes, ideal for wireless power supply via magnetic coupling.

Project construction

Transmitter schematic

Transmitter schematic

Transmitter PCB

Transmitter PCB

Receiver schematic

Receiver schematic

Receiver PCB, designed to fit into battery compartment

Receiver PCB, designed to fit into battery compartment

Coil design

Coil design

Copper tape feed through

Copper tape feed through

Transmitter PCB, finished

Transmitter PCB, finished

Receiver PCB, finished

Receiver PCB, finished

The USB receiver dongle was hacked to provide 5V supply

The USB receiver dongle was hacked to provide 5V supply

Mouse in parts

Mouse in parts

Mouse fitted with receiver coil

Mouse fitted with receiver coil

Fitted with receiver buck circuit. Of course, the battery lid didn't fit back in

Fitted with receiver buck circuit. Of course, the battery lid didn’t fit back in

Finishing the transmitter

Finishing the transmitter

Still not sure why I got plateaus on the drain waveform

Still not sure why I got plateaus on the drain waveform

And finally, a video demonstrating that it works

 

More to come soon!

 

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