No-contact chargers for electric toothbrushes
Most rechargeable devices have some sort of electrical (physical) connection with a power source. My electric toothbrush is in a sealed plastic case with no physical contacts. It gets recharged in a plastic base. I assume that the base unit senses the presence of the toothbrush handle and starts emitting an oscillating magnetic field, which induces an electrical current inside the handle, which charges the battery.
Is that correct?
I imagine that they choose a sealed base unit because the toothbrush is subjected to a lot more water and other fluids than, say, an electric razor. The sealed handle and base prevent moisture from getting to the electronics.
I am wondering why this method of recharging devices is not more common. Is magnetic induction a less efficient way of transferring power than a physical connection? Are there other drawbacks?
Is that correct?
I imagine that they choose a sealed base unit because the toothbrush is subjected to a lot more water and other fluids than, say, an electric razor. The sealed handle and base prevent moisture from getting to the electronics.
I am wondering why this method of recharging devices is not more common. Is magnetic induction a less efficient way of transferring power than a physical connection? Are there other drawbacks?
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