charge batteries via inductive coupling

Are you using Google? Your posts omit the text you are replying to. In order to make the thread intelligible, please hit "more options" and "reply." Then your post will include the text you're replying to.

Don't use a toroid because they are self-shielding. You will get no coupling.

No they don't. The message he's responding to follows his post (top posting). If I read it correctly, he's using Forte Agent 4.0/32.1071 through usenetmonster.com

Mike

When truth is absent politics will fill the gap.

If you make them figure eights, you end up with six coils for the electrical price of three!

aspects

ball's

was

Here's a paper on an inductively coupled battery charger project

It points out a number of factors which you need to consider whatever method you use. For starters, the switching frequency needs to be fairly high to keep the size of inductive components small. Then there is the factor of maximum power transfer efficiency, which this paper states is around 36% with 20% duty cycle. Then you have to consider charge regulation etc.....

All in all, it isn't a simple process to do it inductively, so good luck in your endeavour...

You could use a vibrating base, and when it gets to the coil, the magnetization effects will lock it in place without any switching or other circuitry required.

Please REFRAIN from top posting when you are in a Usenet newsgroup. This ain't e-mail.

On Tue, 11 Dec 2007 02:55:07 GMT, Ross Herbert wrote: You might be able to adapt this design

and soup it up for your application. I still can't see how you are going to incorporate the charge control circuitry inside your ball...

there

A toroid keeps all of it flux inside, and there would be no coupling to any winding that is not actually would around the toroid. Wires and coils placed near toroidal transformers and coils do not impart any energy to the proximal wire or coil, unless it is INSIDE the toroid center hole (not much energy there). It has to actually make turns around the core to couple with other windings on said core.

STOP top posting!

I can't believe that you are using Agent, and you actually physically move your cursor above the default position. You are willing to do that, yet are to lazy to scroll down in a post to read an answer, or make a reply the proper, chronological way.

Here's a clue... the same amount of effort is involved, lazy ass.

Idiot! Every post he has made has been top posted, and has included the previous post below it. Also, do you not know how to read a header?

Oh yeah... he'll certainly understand that non-term.

Nice fact, but devoid of explanation as to why.

Me either, as it needs to be near the balls outer surface to work, and that would require that there be a duplicate mass on the opposite side of the ball to balance it properly. Unless a wobbly ball has no effect on his application.

design

soup it up for

(A) He doesn't have to put the whole charge controller inside. (B) The charge controller needs very few parts.

Once the design is set, he knows the primary side to secondary side transfer function. This means that the primary side controller can set gross current limits and voltage limits.

A signal can be brought back from inside the ball either inductively or optically. This means that a simple voltage measurement can be done inside the ball if needed.

If the control needs to be kept completely inside the ball, a 6 legged PIC would be more than enough to do the logic and a single transistor can do the power switching.