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Registered Member #1374
Joined: Tue Mar 04 2008, 04:14PM
Location: Switzerland
Posts: 10
Hi, I'm trying to build a SSTC. I saw that some people directly fed the half or full bridge (mosfets) with rectified (half or full wave) mains. My question is : will this be able to feed the tesla coil at about 300-400 kHz ? Because I tried someting similar (with induction heating) and had the impression that mains is not able to follow that frequency (because of inductance), and it worked a lot better (it was not just the effect of a higher DC voltage because of the filtering) when I placed some smoothing film capacitors across the bridge, that are good at these frequencies.
Registered Member #1739
Joined: Fri Oct 03 2008, 10:05AM
Location: Moscow, Russia
Posts: 261
Independant of frequency, you need to install both film caps as brudge bypass for every case and some smoothing caps for the case you don't need the 50/100Hz modulation you'll get in a system fed by unsmoothed half- and fullwave rectified mains.
Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
Decoupling caps do just as their name suggests: decouple the system from the line inductance feeding it. They may need to be fairly large if there is no DC bulk storage (like a big electrolytic). Several uF for a SSTC for sure.
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Bridge feeding
