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Registered Member #42796
Joined: Mon Jan 13 2014, 06:34PM
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Posts: 195
the voltage rating is the maximum reverse voltage up to which the IGBT survive when switching inductive loads there will always be kickback higher than the rail voltage even when switching resistive loads there are still stray inductances present so usually a rail voltage of half or in most cases lower that the IGbT rated voltage is used
the current rating is trickier it depends on how fast heat can be moved away from the die and many other factors like hard switching vs soft switching, frequency etc
Registered Member #4992
Joined: Wed May 23 2012, 03:57PM
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Posts: 108
What about mosfets? Do they work on this same principle? I currently have a tank running on 30 to 40khz and would like to pull about 100amp at 400 to 600v. What would be the best choice for this application?
Registered Member #4074
Joined: Mon Aug 29 2011, 06:58AM
Location: Australia
Posts: 335
With MOSFETs and IGBTs the ratings are usually the absolute maximums the devices can withstand before failing. A TO-247 package IGBT might be rated for 120A DC collector current at 20 degrees C (or whatever), but if I put one on a heatsink and pass 120A DC through it continuously using an arc welder, it will get extremely hot. Sort of like a car engine: it might make 300 horsepower at 6,500 RPM, but I don't want to drive around town with the motor bouncing off the rev limiter, because that will cause undue heat, stress and wear.
For switching 600V 100A at 40kHz you will be looking for a big brick certainly rated for 1200V, and perhaps 300A or more?
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Using Igbt at full voltage and current rating
