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From: "Edward Rawde" <invalid@invalid.invalid>
Newsgroups: sci.electronics.design
Subject: Re: 200V at 10mA
Date: Tue, 27 Aug 2024 00:05:31 -0400
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"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vae8ql$1o845$1@dont-email.me...
> On 22/08/2024 2:39 am, Edward Rawde wrote:
>> Is there an off the shelf part I can use for the transformer in this?
>>
>> It's based on a design someone else posted in this group a long time ago (maybe 10 years ago by now).
>> I can't remember the name of that individual.
>
> <snipped .asc file>
>
> There's a more elegant solution to that problem that was discussed here a few yeas ago.
>
> sci-hub.do/10.1109/tpel.2007.909192
>
> Abramovitz, A., & Smedley, K. (2007). A Resonant DC-DC Transformer With Zero Current Ripple. IEEE Transactions on Power 
> Electronics, 22(6), 2344-2351. doi:10.1109/tpel.2007.909192
>
> It's essentially the Baxandall class-D oscillator with two extra windings on the feed inductor. The paper talks about integrating 
> all the windings on single - carefully gapped - I-E core, but using two cores gives you an easily designed way of getting to the 
> same advantage.
>
> At the time I posted an LTSpice simulation that made the point. The output wasn't entirely ripple-free, in that there were 
> switching transients which would have had to have been filtered out, but that needed a much smaller R,L and C values than you'd 
> have need to get rid of the switching frequency components.
>
> It won't be attractive if you have a pathological fear of transformers or an aversion to winding them yourself a or finding a 
> nearby transformer winding shop to wind a few of them for you.
>
> For volume production you'd use printed windings, but thye need a specialist supplier too.

Thanks I'll have a look.
I haven't done much for the past two days due to a touch of Covid.

I have no fear of transformers or winding them myself but I'd have to admit that some of the work I could do 40 years ago might be 
best avoided now.

>
> -- 
> Bill Sloman, Sydney