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> <1a5665d2-c032-29f3-6de3-d4e3cd52f42b AT linetec DOT nl> <8a6378847926baf01ef4fca1383d2bb9 AT iae DOT nl> From: "Richard Rasker (rasker AT linetec DOT nl) [via geda-user AT delorie DOT com]" Message-ID: <23accb16-b75d-b195-772d-2fe3c80a420e@linetec.nl> Date: Fri, 16 Feb 2018 18:22:23 +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="------------CF1B468579BFBB0362D75892" 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. --------------CF1B468579BFBB0362D75892 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable Hi John, Op 16-02-18 om 17:36 schreef John Griessen (john AT ecosensory DOT com) [via=20 geda-user AT delorie DOT com]: > On 02/16/2018 10:08 AM, Richard Rasker (rasker AT linetec DOT nl) [via=20 > geda-user AT delorie DOT com] wrote: >> I'd first have to learn how to model this transformer properly. One=20 >> thing I can say: It's already quite an education. > > Using a transformer actually helps avoid saturation over an inductor.=C2= =A0=20 > You should be able to model it > as ideal unless you want to push the limits.=C2=A0 How fast are your=20 > measurements needing to be? > Really 300kHz driving the piezo?=C2=A0 I was thinking much less when yo= u=20 > said "measurements". The piezo device itself is optimized for 41 kHz, so no need to go much=20 higher. It's just that Airmar's development kit has a range of a full=20 decade (30-300 kHz), and that Marcel wondered how the driver manages=20 this with the rather sluggish-looking 1uF caps parallel to the MOSFETs. I was also wondering if I could do away with the center-tapped=20 transformer, and use a half H-bridge instead, see attached schematic=20 (the 4.7uH inductor is supposed to ease the MOSFET load, and provide a=20 more sinusoidal output; same with the gate circuitry, to slow down the=20 MOSFETs slightly -- this exact same half H-design is used in 100 kHz PWM=20 motor drives and performs just fine). I'd say that with the right transformer, this should do pretty much what=20 I want -- but if anyone spots a bad flaw, please let me know :-) Regards, Richard --------------CF1B468579BFBB0362D75892 Content-Type: application/x-geda-schematic; name="PiezoDriver_Half-H.sch" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="PiezoDriver_Half-H.sch" diAyMDE1MDkzMCAyClQgNTAwMDAgNDA0MDAgOSAxMiAxIDAgMCAwIDEKUGllem9Ecml2ZXJf SGFsZi1ILnNjaApUIDUwMDAwIDQwMTAwIDkgMTIgMSAwIDAgMCAxCjEKVCA1MTUwMCA0MDEw MCA5IDEyIDEgMCAwIDAgMQoxClQgNTM5MDAgNDA0MDAgOSAxMiAxIDAgMCAwIDEKMC4xClQg NTM5MDAgNDAxMDAgOSAxMiAxIDAgMCAwIDEKUi5FLiBSYXNrZXIgLyBMaW5ldGVjCkMgMzM3 MDAgNDAwMDAgMCAwIDAgdGl0bGUtQTIuc3ltCkMgNDMyMDAgNDk2MDAgMSA5MCAwIGNhcGFj aXRvci0xLnN5bQp7ClQgNDI5MDAgNTAyMDAgNSAxMCAxIDEgMCA2IDEKcmVmZGVzPUMzClQg NDI5MDAgNDk4MDAgNSAxMCAxIDEgMCA2IDEKdmFsdWU9MTAwbkYKVCA0MjUwMCA0OTYwMCA1 IDEwIDAgMCAwIDAgMQpmb290cHJpbnQ9U01EX1NJTVBMRSAxMjAgNjAKVCA0MzIwMCA0OTYw 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