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Primary side reduction of VAC

Don't know your app. and how well it would suit, but the first thing that came to mind reading your post was a thermistor (NTC) - sizing it/them so it stabilizes with the right amount of DCR. Would do double duty as a soft(er) start device. (I did this a few years ago and it worked fine at the time)

'just had another thought - If the mains voltage varies a lot would it work well to use a PTC device that would increase resistance as the circuit draws more current (with rise in mains VAC)? You wouldn't get the soft start and sizing it would take some experimentation - though I think the manufacturer's engineer would help you work it out. I haven't tried it myself and can imagine reasons it may not work but I think the idea is at least worth a look.


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  • Primary side reduction of VAC - Ian L 13:24:53 03/11/07 (0)


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