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Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
Here what i think to do : first i will use this interrupter: second, i going use this driver, with my modification: for each 2 IGBT i will use different GDT and he have his one driver, so two cores, two drivers, i believe that i get better driving speed For catch resonance (from secondary), i will use 760T 3F3 material toroid (one, not cascade)(from secondary) GDT driver i will be UCC27425P + mosfet (p and n channel) (GDT core is toroid of 3f3 material, like all toroid's) for bridge i think use REVOX RIFA 3300uF capacitor (rated to 400Vdc) each 2 IGBT will be decoupled by two 4,7uF snubber capacitor from ebay... later i will make tank cap, but don't know, capacity witch will be ok in my case... here is pic of driver electronics's
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
I investigated it, but never tried it. Overcurrent protection with a CT just seemed easier. Of course, that doesn't protect against shoot-through currents caused by a fault within the inverter, but I thought it was easier just to avoid those by good design.
One problem with desaturation protection is that we use the IGBTs at higher currents and frequencies than they were designed for. This means a lot of L*di/dt voltage across the package inductance, which would probably fool a lot of Vce(sat) detector circuits.
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
Dr. Quit The Dr. Thing! wrote ...
One problem with desaturation protection is that we use the IGBTs at higher currents and frequencies than they were designed for. This means a lot of L*di/dt voltage across the package inductance, which would probably fool a lot of Vce(sat) detector circuits.
My friend from university madded high power DRSSTC (pulsed 1000A) he use motor control unit to drive IGBT , and where was protection over voltage, over current and Vce, an coil work properly :) (but he don't kill any IGBT ) and here is idea:
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DRSSTC
