Actions
Forum Thread Details
  • State Not Answered
  • Replies 12 replies
  • Subscribers 288 subscribers
  • Views 1184 views
  • Users 0 members are here
Related

Inductive charger

Former Member

I'm going to design an inductive charger and I have a lot of open questions and don't really where to start. I know about the principle how it works. I need help with several things.

The idea is to get 5-7VDC out oin the secondary side, and something like 100mA would be nice.

 

First of all, what switching frequency is suitable concerning size and efficency of components, and also regarding type approval issues? I think electrical toothbrushes uses approx. 60 kHz so maybe that is a suitable frequency.

Secondly, does anyone know about a design example I can use for a start?

Does anyone have any suggestions for suitable inductors? Supplier, part number etc?

  • 0 in reply to Former Member

    Hi Philippe!

     

    After starting this thread I made several tests with inductive charging. From my experience I will say that inductive charging without a magnetic core gives such a low efficency so it more or less useless. Inductive charging as we know it today is not very useful at all. You are dependent on placing the inductors exactly right compared to each other, and you need a magnetic core in between. It limits the use of the technology very much.

    Furthermore, it's very hard to find sutiable inductors for this. You have to wind them by yourself or you have to buy customized inductors in large volumes. 

     

    There is a team that has developed a solution with hexagonal inductors printed on PCB. This solution looks very iterseting to me, but this team has a patent for it.

     

    I wanted to make a nice inductor charging solution, but I have more or less given up on this.

    Sorry! :-(

  • 0 in reply to Former Member

    Roger

     

    Did you ever sort this out?

     

    I have a charger - 110v and have the circuit of it if it would help.

     

    It is in Eagle Cad format if you have Eagle on your PC or I could just send a .jpg of the screen.

     

    Let me know

     

    Cheers