 Sheilding circuitry from RF from a flyback transformer and plasma globe
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Gregary Boyles
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Sun May 17 2015, 04:17PM
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Registered Member #9039
Joined: Wed Dec 26 2012, 03:31PM
Location: Epping, Victoria, Australia
Posts: 117
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I tried sticking a tin can over the flyback and insulating the HV wire with Al tape but found that the HV was arcing through the insulation to Al tape on the outside.
I probably should have seen that coming but it is all a learning process.
I found a better approach was to move the flyback up onto the same platform as the globe itself and above the drive circuitry. And then I put Al tape on the underside of the platform and earthed it.
This approach worked quite well with a dramatic reduction in RF around the drive circuitry.
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GrantX
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Registered Member #4074
Joined: Mon Aug 29 2011, 06:58AM
Location: Australia
Posts: 335
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Glad you've had some success. Now you know what I meant when I said shielding HV circuits can be difficult or fiddly. The HV wire isn't designed to have grounded metal in close contact, otherwise you get corona and insulation breakdown.
The best method for shielding will still be an enclosed metal case for the driver and ground plane for the bridge. If the flyback transformer is creating a lot of noise then I imagine the wires between the primary and bridge will also be radiating. Perhaps the interference is simply caused by capacitive coupling between the HV circuit and everything else.
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