With FETs, it works naturally, as the conduction channel has a positive temco. The cooler FET has the lowest resistance and so it takes more of the load until it reaches the temperature of the others.
IGBTs have a negative tempco EXCEPT for those designed to be run in parallel. In my highest power induction heaters, I have three 900 volt, 30 amp IGBTs in parallel on each side of the Royer oscillator. One key to making it work is to have the devices tightly thermally coupled so they all see the same temperature. John On 04/23/2017 06:30 PM, 'orange_glow_fan' via neonixie-l wrote: > In an effort to increase current handling abilities, a 'friend' suggest > that one could connect a fet or mosfet in parallel with another identical > device.... > > I tried to wrap my mind around that, but my limited knowledge pretty much > put a stop to that...In theory it sounds possible, yet somehow it seems > wrong... > > > How's that for indecision.... > > What say you? > > Thanks, > > Kerry > > -- John DeArmond Tellico Plains, Occupied TN http://www.tnduction.com <-- THE source for induction heaters http://www.neon-john.com <-- email from here http://www.johndearmond.com <-- Best damned Blog on the net PGP key: wwwkeys.pgp.net: BCB68D77 -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/70d4d093-9744-3a6f-555a-114c78691743%40neon-john.com. For more options, visit https://groups.google.com/d/optout.
