 transformer driving capacitive load (ultrasonic transducer)
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Wedge
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Wed Oct 20 2010, 11:01AM
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Registered Member #315
Joined: Mon Mar 13 2006, 06:44AM
Location:
Posts: 2
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Running an ultrasonic transducer off a 5 V system I would like to drive it by transformer to increase voltage.
I see two ways:
1st) brute force... try different winding ratios and hope for the best
2nd) do some prior calculus/thinking... wich is the way I prefer. But here comes the question: my knowledge on topic is insufficient. :(
Maybe some of you can help and teach me. It -seems- to be related to gate transformers.
things I have in mind:
- Power is no issue it is 40 kHz air ultrasound and I would even think about directly driving the primary by paralleled I/Os of a microcontroller.... at least give it a try.
- a 5 V, 40 kHz burst should be transmitted which limits the inductivity because of rise time?
- the core (whatever I find lying around) must not saturate. Limits inductivity the other way around?
- winding ratio should be 1:3 can I connect a capacitive load (the transducer) directly to the secondary?
- do I have to consider any L/C tuning?
- (...)
any help, theoretically or practically related, is welcome.
thanks in advance!
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Pinky's Brain
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Registered Member #2901
Joined: Thu Jun 03 2010, 01:25PM
Location:
Posts: 837
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You are going to need to push nearly half an ampere through the primary AFAICS ... that's going to stress most I/Os a bit.
Would seem easier to me to just make a 40 volt supply and drive a MOSFET.
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Coronafix
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Registered Member #160
Joined: Mon Feb 13 2006, 02:07AM
Location: Melbourne, Australia
Posts: 938
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Why don't you just drive a mosfet and parallel the transducer across it?
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