Author Topic: Odd gate drive behavior  (Read 231 times)

Offline vince1

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Odd gate drive behavior
« on: January 10, 2023, 05:11:06 AM »
Hello everyone,
I've been using this forum as a reference for over 2 years , but this is officially my first post!

I have just completed my first drsstc (took a while, but i got there!) It uses a full bridge of cm200 igbts and it resonnates at about 110 kHz. However, it doesn't start resonnating if tvs diodes are added to the gates. If they are off, the coil resonnates fine, but it gets over 30v on the gates...

I am using primary feedback with a ud2.7c driver. I soldered up the driver myself, so the issue could be there, I'm not sure.

The diodes are 1KE33a diodes from digikey. Any idea why they might cause an issue?

Thanks.
« Last Edit: January 10, 2023, 05:17:36 AM by vince1 »

Offline davekni

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Re: Odd gate drive behavior
« Reply #1 on: January 10, 2023, 05:47:25 AM »
1.5KE33A are unidirectional TVS diodes.  IGBT gate voltage is bidirectional when using a GDT.  Either use two 1.5KE33A parts in series back-to-back (one each way around), or change to the bidirectional part 1.5KE33CA.

Quote
If they are off, the coil resonnates fine, but it gets over 30v on the gates...
A typical 33V TVS diode will start conducting around 33V.  Voltage will be a bit higher if significant current is being clamped.  Shouldn't be an issue.  However, if you want to keep Vge below 30V, you'll need a 27V TVS or at most 30V.

BTW, for Vge, 600W TVS diodes are more common than these 1500W ones.  Adds less capacitance load to UD2.7 output.

Have fun with your coil!
David Knierim

Offline vince1

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Re: Odd gate drive behavior
« Reply #2 on: January 10, 2023, 01:38:15 PM »
Thank You! That makes a lot of sense...

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Re: Odd gate drive behavior
« Reply #2 on: January 10, 2023, 01:38:15 PM »

 


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