Question on Oral-B toothbrush charger

Nov 11, 2004 3 Replies
Z

Has anyone used an Oral-B power toothbrush (7000 or 8000 series)? I have one and it uses normal 110V power to charge Ni-MH battery. The interesting thing is its charger interface. The charger base has a protruder and the toothbrush has a corresponding receptacle, which match each other for charging. However, both the protruder and the receptacle are made of plastic material, i.e. non-conductor. I measured them using my multimeter and it shows no voltage, no current and infinite resistance, confirming that they are indeed non-conductors. So the questions is, how is charging done with non-conducting interface?



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J

Probably like my Panasonic shaver... transformer halves with air-gap.

...Jim Thompson

| James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
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P

"Zhang" schreef in bericht news: snipped-for-privacy@posting.google.com...

Ever opened a brush like that. Found a coil at the bottom that was connected to a rectifier and loading circuit. The loader provides a magnetic field of about 22kHz that is conducted by a kind of a pin that goes right through the center of the coil. You can see something of its working when you place the loader with a brush in place put on an steel (iron) surface. The load LED will dim.

petrus bitbyter

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Z

Transformer with air core? Hmm ... that sounds right.

The base has a block with size of a typical household transformer where the 110V comes in. It should be the place that transformes 110V AC to

1.2V AC, I can feel the heat by touching the cover.

The protruder/receptacle interface should then form another transformer where 1.2V AC is coupled into the second coil inside the toothbrush, and further rectified to 1.2V DC to charge the battery.

Considering the small size of that interface, it's pretty neat design.

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