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the transformer is making noise from 10kv to 20kv I didn't go any higher cause the mosfet starting to get hot, any ideas what could cause this? I have 20 turns on the primary is this transformer
Registered Member #2405
Joined: Fri Oct 02 2009, 12:59AM
Location: Wisconsin
Posts: 140
Make sure you are operating the transformer for the frequency it was designed for. ALL of mine will make noise at certain frequencies, I have about a dozen different flybacks and once you hit the sweet spot they dont make any noise at all.
thank you for your advise guy , I willl look for all that, but can you tell me how would you doit? what methos you would use to find out the freq, where the noise is comming from while is running at 10kv, how to find out if is saturarting,
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
The sound from the coil can be probed in two ways. A flexible plastic tube can be terminated in a tiny condenser mike (from an old cassette recorder) Then you can view the sound signal on your scope. This way you don't get hands near coil.
The other way is to use an 'ultrasonic sniffer'. This is simple gadget made from a piezo transducer in a hetrodyne circuit that will convert ultrasonic noise to audible signals, to listen to on a loudspeaker. In addition you can view the raw ultrasonic signal, pre-division, on your scope.
Various ultrasonic vibrational modes in mechanisms can combine to produce audible noise
In either case long plastic sonotubes , (medical tubing) will keep the intense electric or magnetic fields out of your scope input.
Registered Member #3343
Joined: Thu Oct 21 2010, 04:06PM
Location: Toronto
Posts: 311
Andre: Try to reduce the leakage inductance of the primary, in order to obtain higher voltage output. Replace the 20 turns primary with two 10 turns coils, and locate these coils closer to the secondary coil. The two coils to be symectrically assembled to the secondary. Note that the coils are to be connected in series and proper phased./
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transformer makes noise from 10kv to 20kv
