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Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
I have been testing the celem capacitor with my induction heater and have blown some igbts after hitting 25A. I had the current lagging the voltage by about 10 degrees. I was operating at 50% duty @ 100 kHz.
I need one that is rated for 600vdc and about 40A rms.
I am not sure if the IGBTs overheated from improper heat-sinking or some other fault like reverse currents. Here is the model:
Because it had a fast reverse recovery diode, I did not include one in my inverter. Was this a mistake? Could I still have problems if the current is lagging by as much as 10 degrees? I have put together a module that has a shotky diode in front of the source and a reverse-recovery diode between the source and emitter. I will see if this makes a difference.
Also, is anyone familiar with this brick, and would this be the way to go for a heater in the 8-10kw range?
Registered Member #2648
Joined: Sun Jan 24 2010, 12:45PM
Location: Australia
Posts: 291
On ebay Pulsar Surplus are selling some high power IGBTs for a good price, haven't bought from them but the look good
and there is this: US $24.99 "Original MITSUBISHI IGBT CM300HA-24H" 1200V 300A (average ratings I think) I ordered one of these, it was shipped quickly and I got it in 6day and it looks brand new (apart from the letter g written on in and a tiny bit of what looks like heatsinking compound in the mounting holes) I haven't tested it but it looks good.
Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
I bought some modules last night. 1200v @ 400A for $25.
My question still stands as to why I was having issues with my IGBT. I looked at the specs and saw that the reverse current is only good for 12A. Can i still have reverse currents if the current is always lagging the voltage?
The good news is the resonant locking driver and celem capacitor are working just fine.
Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
The problem was solved with adding a blocking diode to the switch and ultra-fast reverse diodes between the source and emitter, despite there being a blocking diode. When I looked at the specs, the reverse current the diode can withstand is not that great. I had the inverter cranking with no problems. Now I just want to get buff it up a little more.
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Need the right IGBTs for induction heater
