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Mail Archives: geda-user/2018/02/16/06:40:35

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Subject: Re: [geda-user] (Off-topic) Question wrt driving HV piezo transducer
To: geda-user AT delorie DOT com
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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: <1a5665d2-c032-29f3-6de3-d4e3cd52f42b@linetec.nl>
Date: Fri, 16 Feb 2018 12:38:48 +0100
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Hello Marcel,

Op 16-02-18 om 06:32 schreef mhx AT iae DOT nl:
> On 2018-02-15 23:02, Richard Rasker (rasker AT linetec DOT nl) [via 
> geda-user AT delorie DOT com] wrote:
> [..]
>> However, this afternoon, the product dealer was kind enough to send me
>> the schematic of a 500 Vpp development driver kit, featuring a
>> center-tapped symmetrical push-pull transformer(*) circuit with two
>> FDD16AN08 MOSFETs, each with a 1 uF capacitor across drain-source.
>> These big DS-caps seem rather weird already.
> [..]
>
> This could be a push-pull parallel-resonant parallel-load type 
> configuration.
> It should be tuned to exactly the resonance of the effective L+C and 
> will have
> a Vds of about 3.14159 times the supply voltage. The transistors turn 
> on when
> their Vds tries to go negative (automatically). The 1uF across drain 
> source does
> not sound familiar but is equivalent to a single cap between the two 
> sources,
> i.e. in parallel to the transformed transducer (as it should be).
> Theoretically, this is the dual circuit to the HB series resonance 
> series load
> one.

Thanks for the explanation, although I don't quite grasp the theoretical 
basis -- I'm not very experienced with transformer circuits, and this 
one in particular still raises some questions. Can you point to some 
other examples where this principle is used? Most CFL drivers I find 
employ some sort of series resonance solution, AFAICT, without any DS caps.

For all clarity, I attached the schematic, also because there's 
something else I don't understand: the top MOSFET (Q1) doesn't get the 
burst frequency at all, just the 1.5 ms LF pulses. The bottom one (Q2) 
is supplied with the burst signal as expected.

I carefully checked this against the schematic I was given, and I'm 
positive that I didn't make a mistake here. Could this be a mistake on 
behalf of the original designer? I contacted the supplier, but they 
couldn't tell me anything. Or perhaps Q1 is 'automatically' syncing to 
Q2 via changing voltage levels on the drain? I can't really see this 
happening in any reliable way...

BTW, the circuit isn't really designed for resonance, as the 41 kHz 
given is in reality a selectable frequency between 3 kHz and 300 kHz, 
with 41 kHz being just one of the settings.

Anyway, thanks for all your help so far (from the others too), I'm 
learning a lot!
(And I think I'd better start calculating, building and measuring things 
now.)

Best regards,

Richard

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