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Registered Member #952
Joined: Mon Aug 13 2007, 11:07AM
Location: Finland
Posts: 388
I'm progressing in building a SSTC similar to Steve Ward's Mini SSTC. At most, it will be powered from rectified 230V mains voltage. I'll have a 680uF smoothing capacitor on the bus. It seems many people don't use inrush current limiting in such designs at all (or is it just that they're running the coil off a variac and hence can always "smooth start" the coil?). However I think it would be good to have limiting, if only to spare the bus voltage switch from surges which could possibly harm the switch in the long run.
I have salvaged some NTC thermistors from ATX power supplies (used for the exact same purpose there, I believe). I've never seen anyone use such a thermistor in a SSTC, so I wonder if there is any particular reason why they wouldn't work in SSTC duty? Would they limit the available output power or possibly get fried?
E: I realize the power capability is proportional to the size of the thermistor. My coil is going to run interrupted with quite a low duty cycle, so the average power is not going to be very large. So if I have a thermistor from a 400W ATX PSU, I suppose that could work for a SSTC with similar average power?
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Looks like you answered your own question there
A 'cheap' ATX supply would use a resistor of some sort. I looked into using inductors (chokes) for the same purpose a while back, a bit more expensive, but you aren't wasting energy heating resistors.
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Inrush current limiting (thermistor?)
