I'm working with an DC power supply feeding an an H-bridge topology with some gate drivers. The output of the IGBTs are going to a transformer to step up the voltage to 250V and then goes to a rectifier bank and smoothing cap to get my VDC value. I was probing around to see what needed to be done for my current feedback circuit I'm wanting to implement, when I noticed these massive amperage spikes(Kiloamp range) on the main DC power supply.
The spikes line up with the Hi/LO pulses given to the gate driver so my first thought was I had some overlap in my IGBT firing. I did some looking and the Hi/LO firing aren't over lapping but the massive spikes are still in line with some of the pulses. Zooming to the spikes, the width of the spikes are on average of about 1ns in width. Just to be on the safe side, I adjusted my time delays thinking maybe its my tail currents getting me, but its the same thing.
Right now I'm digging into maybe the transformer is wrong. But besides that I'm kinda at a loss.
Thank you,
double
The spikes line up with the Hi/LO pulses given to the gate driver so my first thought was I had some overlap in my IGBT firing. I did some looking and the Hi/LO firing aren't over lapping but the massive spikes are still in line with some of the pulses. Zooming to the spikes, the width of the spikes are on average of about 1ns in width. Just to be on the safe side, I adjusted my time delays thinking maybe its my tail currents getting me, but its the same thing.
Right now I'm digging into maybe the transformer is wrong. But besides that I'm kinda at a loss.
Thank you,
double
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