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Replying to @reneritchie
Rene, a bold move. A thing I learned experimenting in my garage lab with inductive charging is the shape of the wave form and the way the pulse is timed over a duty cycle. I am no battery expert, just some guy, but this solves many temperature gradient issues I have come across.
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Replying to @BrianRoemmele @reneritchie
Rene, Thus with 3 inductive coils, one can sequence the pulses in a pattern that adjusts to the type of device on the coils. The wave form should also be shaped over the cycle and also for each type of battery that is charged. You can not have 3 coils active at the same interval.
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AirPower didn't just have three coils, it had 21 to 24, and many of them had to overlap three-coiled chargers exist and work fine; the thing Apple tried to do was eliminate dead zones where no power was available
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Replying to @UlurooSpeaks @timohetzel and
For a technology with an average efficiency of 60% and which produces a significant amount of excess heat per coil if you want 20 W of output power.
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Nigeth, indeed! This is why it made more sense to have larger coils with a sequential and wave shaped charge cycle. Easy to control the gradients in this environment then with +3x. Each coil would adjust to the device and ambient temperature. Hard to do with so many coils.
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