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Wireless Charging
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 Posted: Wed Jul 18th, 2018 10:28 am
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Bob D
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Dan,

I guess my hangup was locating a Qi standard charging system that would charge those 9.6, 11.1, and 12v batteries, all I ever saw that were ready made was for a max of 5v.



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 Posted: Wed Jul 18th, 2018 06:34 pm
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dan3192
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Working on the problem. Have a solution, but not yet verifiable. 1S battery arrangement is first, then 2S, 3S, etc. Still many "peripheral" problems to resolve.


Dan 

Last edited on Wed Jul 18th, 2018 06:44 pm by dan3192

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 Posted: Sun Jul 29th, 2018 06:08 pm
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dan3192
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Sometimes you just can't plan far enough ahead.

It looks like the biggest coil I can get between the rails is around 12mm, good for a 1 Watt system. That's not enough to charge my batteries at a rate I'll be satisfied with, so other shapes will need to be investigated as well as how they get mounted.

I've also found receiver coils are quite "fussy" about what transmitter coils they couple with, so another area to investigate including what coil specifications mean as far as proper selection with other coils while keeping Qi protocols.

Yet another irony; trying to make things simple, but forced to look at another technology that's not so simple.

Dan

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 Posted: Sun Jul 29th, 2018 06:30 pm
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d10ng
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Dan,
What is your layout like?
I'm considering putting the charging circuit in the roof of a loco, and a simple overhead bridge type structure in the off stage area. Removes the requirement to fit something between the rails.

Dave



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 Posted: Mon Jul 30th, 2018 02:49 am
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dan3192
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Dave,

There's no layout involved here. I'm building a test track with multiple coil and pcb arrangements as a "proof of concept" type of project. Once I get past this stage, I can focus on how to fit induction charging components in with other locomotive components. 

It looks like I'll need bigger coils which will put them under the rails instead of in-between. This, in part, means revisiting the approach needed for charging, i.e., guided positioning or free positioning. There's a third approach called multiple cooperative flux generation I don't even want to think about.    

For now, I'll have to figure how to get Tx and Rx coils as close together as possible so it works like my static testing did. I've already noticed a peculiarity during the coupling process which might be very problematic. I'll be getting some vendor help next week and will get back...with what I can't say.

Re your overhead charging arrangement, could work, but Rx coil height will vary depending on the type of locomotive. This eliminates a fixed reference point for the Tx coil giving you two height variables instead of one...unless the Tx coil is retractable!

Dan      

Last edited on Mon Jul 30th, 2018 02:51 am by dan3192

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 Posted: Fri Aug 24th, 2018 07:09 am
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dan3192
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(Note: To avoid confusion, this is an edited posting done after Post #20. Thank you Si for your help.)  

I received and reviewed information from TDK on coil selection, enough to start assembling a charging track. The problem was how to make a large hole in the E-Z Track for the Tx coil. I found a Forstner bit shown below at a Home Depot store which worked great.
 



Dan

Last edited on Fri Aug 24th, 2018 06:35 pm by dan3192

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 Posted: Fri Aug 24th, 2018 07:22 am
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davecttr
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Oops! Your image there certainly had interesting effects on my page


The previous replies being empty was even more mysterious



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 Posted: Fri Aug 24th, 2018 07:24 am
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dan3192
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Sincere apologies for the messed up post. Don't know what happened. The option to edit it out is not there. If Admin. can delete it, I'd like to start over again.

Dan

Last edited on Fri Aug 24th, 2018 07:27 am by dan3192

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 Posted: Fri Aug 24th, 2018 09:20 am
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d10ng
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Yep, Google asked me if I wanted the page translated or left in Somalian?

Anyway looking forward to seeing a working example Dan, keep up the good work.



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 Posted: Fri Aug 24th, 2018 01:14 pm
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Si.
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Hi Dan  :wave:



I have EDITED out all the 'gobbledegook' from your problem Post ...

... & also Posted your photo back up.



The EDIT button you couldn't find, IS ACTUALLY THERE ...

... it's just that with such a LONG LINE LENGTH of the 'gobbledegook' ...

... you have to 'scroll right' quite a long way, using your Browsers scroll-bar ...

... because the buttons, including EDIT appear at THE CENTER of the Posts width !



You can EDIT the problem Post as you wish now of course as well.

Hope that helps.



All the best.



:)



Si.




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