I am building a relatively small (300-600w) induction heater and trying to select capacitors for this purpose. From my research, low ESR caps are mandatory to reduce heating. However, I have yet to see any values at all to relate the "low ESR" and it seems that most of these devices are of very low duty cycle. I would want to design this one to run nearly continuous. I seem to be caught right between the hobby style builds with very limited duty cycle, and commercial hot rods using VERY expensive water cooled caps.
It seems polypropylene is common for these but I am just not sure how to estimate the bank to stay cool enough. I think it is obvious by the water cooled units that there is probably nothing I can do to eliminate the heating but staying tolerable would be great.
I will probably run around 80-150khz. going to have to play with it a touch.
It seems polypropylene is common for these but I am just not sure how to estimate the bank to stay cool enough. I think it is obvious by the water cooled units that there is probably nothing I can do to eliminate the heating but staying tolerable would be great.
I will probably run around 80-150khz. going to have to play with it a touch.