Braun Oral B Toothbrush
How does the Oral-B toothbrush charge it’s battery without making an electrical connection?
The model of Braun Oral-B toothbrush I have sits on the charging base, but both are completely sealed, and there is no electrical connection between the two. So what is the technology behind this type of charger?
Inductive coupling. There is a coil of wire at the base of the toothbrush inside the plastic charger stand and there is another coil inside the plastic base of the toothbrush itslf. When you pass an alternating electrical current through the coil in the charger stand (the driver coil), it causes a magnetic field to expand and collapse in time with the current. Now this expanding and collapsing magnetic field penetrates though both platic cases of the toothbrush and it’s charging base and as this primary magnetic field cuts across the coil of wire inside the base of the toothbrush case it induces a secondary current to flow in this coil (the driven or secondary coil) which is sufficient to charge the battery in the toothbrush.
braun oral-b toothbrush review
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