This article is the phase III of the magic toothbrush for power without boundaries.
Project Design Phase
In order for my magic toothbrush to be truly “Power without boundaries”, I have to incorporate multiple energy sources like induction, solar, and piezo energy. The induction power is sent from the IDT P9038-R-EVK – Qi 5W Transmitter Prototype Kit. A special magnetic coil is used to pick up that energy. In additions, a small solar panel from Solarola, is integrated with the Harvesting DC converter will supply energy during day time. A Piezo (options) will provide energy as well. Two small solar panels are attached to the Harvesting DC converter board by glue. See picture below.
The Harvesting DC converter is a low power device made by LTC 3330. It is mounted on a small PCB. The output of the DC converter is set at 3.5V to charge two 1.5V rechargeable batteries. See picture below. The rechargeable batteries are used to power a standard electric toothbrush.
Conclusion
Most of the components come from Dig-Key's order. The only exception is the Harvesting DC converter and the small solar panels. I used the demo board from LTC with some jump wires. The solar panels were removed from my electric toys. The initial design got some issues with the IDT transmitter kit. After consulting with IDT application engineer, I have to make minor twists to get it work properly. It takes about 10 hours charging for about half hour usage. It can be improved in future work.
The share link: http://www.digikey.com/schemeit/#2t95
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