Author Topic: Custom Planar Transformer  (Read 3425 times)

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Offline EEVblogTopic starter

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Custom Planar Transformer
« on: February 04, 2019, 03:42:52 am »
Looks sexy  ;D

 

Offline ali_asadzadeh

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Re: Custom Planar Transformer
« Reply #1 on: February 04, 2019, 06:01:39 am »
The size info and PCB layers if could be counted would be nice to be shared :)
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Offline jbb

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Re: Custom Planar Transformer
« Reply #2 on: February 04, 2019, 07:00:16 am »
Phwoar
Might this be related to an ongoing project?
 

Offline EEVblogTopic starter

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Re: Custom Planar Transformer
« Reply #3 on: February 04, 2019, 07:36:46 am »
Might this be related to an ongoing project?

It might.
 

Offline mvs

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Re: Custom Planar Transformer
« Reply #4 on: February 04, 2019, 11:16:56 am »
Looks sexy  ;D
Yes, but is it more useful for your application, then a conventional one?
 

Offline EEVblogTopic starter

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Re: Custom Planar Transformer
« Reply #5 on: February 04, 2019, 11:23:04 am »
Yes, but is it more useful for your application, then a conventional one?

That's the plan.
 

Offline LapTop006

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Re: Custom Planar Transformer
« Reply #6 on: February 04, 2019, 12:08:11 pm »
Looks like you'd still need a hole in the board to mount it, or you'd need to add pins.
 

Offline T3sl4co1l

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Re: Custom Planar Transformer
« Reply #7 on: February 04, 2019, 03:16:44 pm »
Excuse me for not being as excited -- they're pretty standard fare these days.  That said, where's it from -- off-the-shelf component, custom from a supplier, or fully in-house custom (made yourself)? :)

I used my first ones back in... 2012 or so?  Haven't had a need since.  An application almost came up recently, but nah...

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Offline jbb

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Re: Custom Planar Transformer
« Reply #8 on: February 04, 2019, 07:14:55 pm »
Yeah, that is the thing. The wire wound ones have better copper fill factor.

I guess we’ll find out when a video happens. My guess is that someone needed a skinny transformer to fit into an envelope.
 

Online floobydust

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Re: Custom Planar Transformer
« Reply #9 on: February 04, 2019, 08:25:30 pm »
I've only encountered PCB planar transformers in this Rosemount 5300 guided-wave radar liquid level sensor. I believe one is for power and another for data. The HV isolation is to meet hazloc requirements for an IS barrier to the probe which may be in a fuel tank.

It's just a split ferrite core clipped around a PCB for the windings.
Trouble is the ferrite is conductive and the core needs to be glued in place.

edit: note the extra plastic insulators between pcb top/bottom layer and the ferrite core.
« Last Edit: February 04, 2019, 10:27:59 pm by floobydust »
 
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Online Benta

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Re: Custom Planar Transformer
« Reply #10 on: February 04, 2019, 09:01:13 pm »
"Trouble is the ferrite is conductive and the core needs to be glued in place."

Ferrite is not conductive. Iron core is.
 

Offline T3sl4co1l

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Re: Custom Planar Transformer
« Reply #11 on: February 04, 2019, 09:36:05 pm »
Ferrite IS conductive; RTFDS. :)

Specifically, MnZn ferrite is a semiconductor, with modest resistivity in the usual form.  You'll measure on the order of 10s of kohms when you probe across a core.

NiZn ferrite is also a semiconductor, but typically much higher resistivity (hmm, I'm not sure offhand if this is a bandgap thing, or a doping thing, or an impurities thing), in the megs range.

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Online coppercone2

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Re: Custom Planar Transformer
« Reply #12 on: February 04, 2019, 11:23:14 pm »
you can fail a leakage/emi test with inductor magnet wire shorted to core shorted to chassis if its chassis mount
 

Offline jancumps

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Re: Custom Planar Transformer
« Reply #13 on: March 08, 2019, 08:12:58 pm »
Here is a design for a GaN buck converter:



 


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