I've heard about smartphones that support wireless charging. For me it's an amazing miracle!! I googled and found out that it uses something like a transformer for a wireless charging. I had another question because a transformer have an iron core and the two coils ( primary and secondary ) should be very close to transfer power between them... so I wondered how to get rid of the iron core and achieve long distance ? I searched again and I read about radio communications that uses "Resonance" to achieve long distance without using a magnetic core.
I have another question and that I don't find its answer, Radio communications transmit very small power. I think it is few micro volts because we use amplifiers to receive it ... so How can a charger send very large power to a smart phone through long distance and without magnetic core ?
Can I make a homemade device like that ? For example, I connect a homemade coil to an AC supply (low power) Then, I connect another coil to an LED. When I the coil is connected to the power, The LED is on ?
Thanks in advance, and sorry about my english
I have another question and that I don't find its answer, Radio communications transmit very small power. I think it is few micro volts because we use amplifiers to receive it ... so How can a charger send very large power to a smart phone through long distance and without magnetic core ?
Can I make a homemade device like that ? For example, I connect a homemade coil to an AC supply (low power) Then, I connect another coil to an LED. When I the coil is connected to the power, The LED is on ?
Thanks in advance, and sorry about my english