It’s just a matter of time before wireless chargers will be all around us. From cell phones to medical devices, if it’s a portable device and has batteries odds are it will support wireless charging in the near future. I’ve been researching on the topic for some time now and already did a few designs and experiments. Now I’ll start posting some of that.
Using the charger of a wireless toothbrush to induce power in a simple circuit voltage doubler circuit. In this experiment I modulate the resistance of a load to show how the output voltage and output current behave.
[youtube http://www.youtube.com/watch?feature=player_embedded&v=2eMJPf1ri5I]Fortunately I had some Schottky diodes handy to use in the rectifier circuit. A Schottky diode is preferred in small voltage applications, because it starts conducting when the forward voltage is around 0.3v whereas a the standard diode only starts conducting at 0.7v.
here’s a picture of the bottom of the unit:
I’ll soon post other wireless charging experiments and move this blog entry to the projects page.