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Registered Member #2694
Joined: Mon Feb 22 2010, 11:52PM
Location: Russia, Volgograd (Stalingrad).
Posts: 97
Guys, I'm in trouble. I can't tune variable inductor in feedback section UD2.0b. Inductor - SLOT TEN-5-09. Jumper set to 1-2. I see no changes on scope, when I tune inductor. Screenshot attached. What I doing wrong?
Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
So, it looks like its switching early, agreed? That makes me think its working right and maybe the change is not obvious to you. It can be helpful to scope the gate driver output vs current, since actual device switching can sometimes be complicated.
Perhaps the inductor you picked is just too big, and through its whole range gives too much phase lead. Or maybe you have the jumper (which should have been removed from the design as it doesnt apply to the SLOT TEN parts) set in the wrong position. Remove the CT connection and measure the resistance between the CT input pins, it should be just over 51 ohms, if not, then the jumper is wrong and your LR circuit is open.
Registered Member #2694
Joined: Mon Feb 22 2010, 11:52PM
Location: Russia, Volgograd (Stalingrad).
Posts: 97
I did that you tell me and set switch in right position. Resistance just over 51ohm and I see nothing changes. Therefore, inductor too big, but I don't know which induction will be match in my case. Turn-on delay time in my igbt = 46ns. Turn-off delay time = 140ns. Resonanse frequency of my coil = 100kHz. Do you have a formula for that?
Maybe, if on and off delays are different, front and back of signal must be tuned by separate ways, not with one inductor, but with static inductor on LR circuit and two potentiometers with diode on each other, after TL3116?
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irg4pc50ud UD2.0b problem
