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Messages - coil1002

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1
In the services of simplicity, I'd suggest trying something one of the following options:
- a single resistor in the region of 3-5 ohms (corresponding to the datasheet test spec resistance)
- a resistor as above, with an additional combination of another resistor for slowing turn-on (thus increasing effective dead-time) with a parallel diode for fast turn-off
If you're driving the gates with more than 15V then I'd lean towards 5+ ohms rather than 3.

In both cases scope the Vce and Vge waveforms - if there is Vge oscillation or excessive Vce turn-off spikes then increase the resistance. These IGBTs are pretty darn fast with low Qg, so I doubt that you're going to run into too-slow switching unless you use really large gate resistors.

I ended up  getting 5 ohm I will check the waveforms when its built. Thank you all for the responses they where incredibly helpful.

2
Which gate resistor calculator are you talking about? I wrote this to aid myself in playing with figures for DRSSTC: http://kaizerpowerelectronics.dk/calculators/igbt-gate-drive-calculator/

That would be the one Mads. I ended up using the current of the mosfet to calculate to. I came up with 3 ohms with the calculator so I bought 5 ohm resistors for tolerance

3
Hi all I am new to the forum. I have built quite a few Spark gap style coils throughout the years and am now trying my hand at my first DRSSTC. I am going to use loneoceans UD2.7 c for the driver and his 80mm Full bridge board for the bridge. I will be using FGA60N65SMD for the igbt's. I am having trouble wrapping my head around calculating the gate resistors values. Could someone point me in the right direction to a good place to read up on this ? I tried using the calculator but I am at a loss as to how to figure out the maximum gate drive current the driver is capable of. Better stated what do I calculated it off of? My assumption is the current of the mosfets that drive the bridge and if so is it x1 since there is a gate resistor per igbt or total current x4?

Any help would be greatly appreciated. Thank you

 

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