Mail Archives: geda-user/2018/02/16/12:23:48
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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
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