X-Authentication-Warning: delorie.com: mail set sender to geda-user-bounces using -f X-Recipient: geda-user AT delorie DOT com Subject: Re: [geda-user] (Off-topic) Question wrt driving HV piezo transducer To: geda-user AT delorie DOT com References: <6221de93-bb98-d397-79b4-eecf3975c2e6 AT linetec DOT nl> <20180209161532 DOT 6AF57804CEFA AT turkos DOT aspodata DOT se> <20180209204934 DOT CAA35804CEFA AT turkos DOT aspodata DOT se> From: "Richard Rasker (rasker AT linetec DOT nl) [via geda-user AT delorie DOT com]" Message-ID: <1a5665d2-c032-29f3-6de3-d4e3cd52f42b@linetec.nl> Date: Fri, 16 Feb 2018 12:38:48 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/mixed; boundary="------------52A7C0FF2E0A50E4230C611B" Content-Language: en-US Reply-To: geda-user AT delorie DOT com Errors-To: nobody AT delorie DOT com X-Mailing-List: geda-user AT delorie DOT com X-Unsubscribes-To: listserv AT delorie DOT com Precedence: bulk This is a multi-part message in MIME format. --------------52A7C0FF2E0A50E4230C611B Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit 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.) 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