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Registered Member #4992
Joined: Wed May 23 2012, 03:57PM
Location:
Posts: 108
Can anyone give some advise on this gate drive signal which i cant seem to get fixed for my indution heater. Im running a 600v 150A IGBT half bridge brick with a pll ic which is driving my tc4421 and tc4422. I have a 1:1:1 gdt and on my secondary i have 3ohm resistors with zenor diodes.This is also powered from a 15v regulated power supply.
Registered Member #4992
Joined: Wed May 23 2012, 03:57PM
Location:
Posts: 108
Thanks, but it seems that there is very little info on this topic and i dont fully understand steves answer on the topic where he states that you should use a half bridge drtven by a pll. Is this not what im doing? or does it mean that that i should take away my tc ics and add a half bridge, if so! is there a shematic i can follow or do i totally have it wrong or is there another way of fixing the oscillations?
Registered Member #4266
Joined: Fri Dec 16 2011, 03:15AM
Location:
Posts: 874
It looks like a couple of pF and inductors are draining, a tune circuit I think, whats the cabling like to the gate. Have you got a circuit diagram. I tried making a marxs with a cable from the opposite direction to the switch connect to the inductors, made a wave form like that. If its warth anything.
Registered Member #4992
Joined: Wed May 23 2012, 03:57PM
Location:
Posts: 108
Im using 0.5mm solid wire on my gdt which is twisted together and im working on mindchallenger schematic. The only thing substituded was the 39000 uf cap for a .22 nf 500v on my 15v regulator.
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Gate drive signal
