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Registered Member #989
Joined: Sat Sept 08 2007, 02:15AM
Location: São Paulo, Brazil
Posts: 476
Hi all, I have here some problems with SSTC noises on Mains Line. All things that are connected to mains, get a very loud noise. I made a filter here, but I think it doesnt working good :( Someone know what can I use for Filter?
My Filter:
Mains -> 40uF 400VAC Cap -> 5x (1uF 600VAC Cap -> 2 10W resistors with a coil winded arround it -> 1uF 600VAC Cap) -> 200nF 250VAC Poliester Cap -> Variac -> SSTC.
Registered Member #514
Joined: Sun Feb 11 2007, 12:27AM
Location: Somewhere in Pirkanmaa, Finland
Posts: 295
Have you grounded the coil properly? If you have it grounded to mains ground, it can be that your wall outlets aren't properly grounded, just "nulled" (neutral connected to where the ground should be).
Try pounding a copper rod in the ground and using that instead.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
RFI/EMI/EMC etc etc. is a complex topic, my opinion;
1) Use mains 'earth' for everything on the primary side 2) Connect the bottom of the secondary to a separate 'earth' (e.g. a pipe pounded into the ground) OR make a separate 'earth' by laying a couple of meters of aluminium foil on the floor/carpet etc. OR the best is to make a faraday cage around the sstc and use that as the 'earth' for the secondary AND use utility 'earth' 3) Use a commercial line filter, you need both differential and common-mode filtering.
P.S. the wire from the base of the secondary to whatever earth you use is an aerial/antenna for the broadband impulsive noise currents produced when arcing, so length and routing are important.
Registered Member #989
Joined: Sat Sept 08 2007, 02:15AM
Location: São Paulo, Brazil
Posts: 476
Here I dont have mains ground (The Local Eletric Company put the mains ground at neutral ¬¬) I need to make one, but I am with a Bipolar sstc here, It really need a faraday cage?
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Noise problems with SSTC
