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Registered Member #599
Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624
Aaaaand we have results. Well, sort of. I finally killed that IGBT. But it did not fail because i had too much power running through it.
I cranked the bus voltage up to 400VDC (3phase supply). I kept pushing it harder and harder finally getting almost 4x secondary lenght sparks to grounded objects, OCD was set to 2kA and the OCD led was blinking constantly. When playing music, input power peaked close to 6kW (i was measuring rectifier output current and voltage..). Then, BZZZKRZ..BLAM *sparks flying from base*
What i found was not something i expected to see:
I got little bit carried away with power and sort of forgot that my primary cabling was not up to several kW range Cables got really hot and sagged, insulaation failed and tank capacitor got shorted to inverter output.
When i saw this i knew instantly that it was game over. Gate discharge diode was blown in two pieces.
The IGBT wasnt very happy
Oh well. Another item to the wall of fail.
But this does prove that these igbts can handle insane punishing when everything is set properly. If i ever get similar IGBT this test will continue.
Registered Member #599
Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624
And our story continues. This coil doesnt need dark room for sparks to show
Coil is now rebuilt with SKM200GB-128D full bridge
Bus voltage in this clip is 250VDC (dips below 200 during long notes..) and current meter has scale from 0 to 15A with 5A steps
This run was limited by floor and ceiling. I really did not want any sparks to ceiling as all ccfl fixtures and their power wires are there.
If i ever want to push even more power through this thing i really have to redo primary to get higher primary surge impedance and then crank the bus voltage to 500+V
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Do not underestimate the power of the brick. V2
Cables got really hot and sagged, insulaation failed and tank capacitor got shorted to inverter output.
