I'm seeing more and more of these advertised but they don't state whether a special battery is required. How does just setting a device ie. cell phone on top of it charge the devices battery?
Ever thought about how a transformer works ?bdewoody":1o6pgpoz said:I understand how an electrical circuit works, sort of, but I can't grasp how a battery can be charged without a physical connection to the charging source.
So the method is applicable only in low power short range usage. Still it seems better than having to have a different charger for every small battery powered device one might own.adrenalynn":1ypl2bck said:That could be done via RFID.
As far as how it's coupled - it's inductive RF. The same way a radio works.
I've built a handful of inductive chargers. It's really pretty simple in concept and has been around forever. Shavers and toothbrushes have been doing it for at least a couple decades.
The problem you'll have with vehicles is that they need a _lot_ of current to make even a dent in their battery charge. And inductive coupling just doesn't deliver that.