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Subject:	Re: [geda-user] (Off-topic) Question wrt driving HV piezo transducer
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From:	"Richard Rasker (rasker AT linetec DOT nl) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Message-ID:	<519f49d1-11c6-2001-41e8-d1db0cfa9fcd@linetec.nl>
Date:	Sat, 17 Feb 2018 12:28:40 +0100
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Hello John,

Op 16-02-18 om 22:46 schreef John Griessen (john AT ecosensory DOT com) [via 
geda-user AT delorie DOT com]:
> On 02/16/2018 11:22 AM, Richard Rasker (rasker AT linetec DOT nl) [via 
> geda-user AT delorie DOT com] wrote:
>> this exact same half H-design is used in 100 kHz PWM motor drives and 
>> performs just fine).
>
> My question is not about the speed of switching, but of the overall 
> response time.
>
> My center tapped push pull can handle 6 microsecond plus and 6 us 
> minus pulses.  80kHz rep rate.
>
> It's all easier, (not saturating), if you can do with slower, thus my 
> question.
>
> 100kHz is the fastest most ordinary switcher cores run at, so there is 
> easy shopping from 40kHz to 100kHz,
> and you would not want to be below 40kHz so it is less audible.

Ah, I understand now. As mentioned, I only need 41 kHz, as that is the 
f0 of the transducer.

Also, I'm still undecided on the type of transformer and thus the 
circuitry; a transformer with a single primary coil for 12->1200 volts 
probably ends up being a custom-made part.
I'd expect that suitable CCFL transformers should be available 
off-the-shelf, but then again, a cursory search reveals that almost all 
commercially available types are EOL, and definitely not recommended for 
new designs. Not surprising really, given that LEDs have all but 
replaced CCFL tubes.
So perhaps rolling my own is better after all.

Anyway, thanks again for new and useful tidbits of information. As I 
said: I'm learning a lot here!

Best regards,

Richard

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