Author Topic: IKY150N65EH7, is it good for DRSSTC  (Read 588 times)

Offline ethanwu0131

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IKY150N65EH7, is it good for DRSSTC
« on: April 12, 2024, 04:47:33 PM »
Hi, as the title says, is IKY150N65EH7 a good IGBT for a table top sized DRSSTC, it seems good from the datasheet but I though I should get some advice from the experts. Thanks in advanced.

Offline Mads Barnkob

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Re: IKY150N65EH7, is it good for DRSSTC
« Reply #1 on: April 14, 2024, 07:18:20 AM »
It might look good on paper, but if you do not consider your driving parameters and do the calculations, its only guesswork :)

Calculate power dissipation to find out how hard you can drive it, I show how to do that here: https://kaizerpowerelectronics.dk/tesla-coils/drsstc-design-guide/igbts/
https://kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics
https://www.youtube.com/KaizerPowerElectronicsDk60/join - Please consider supporting the forum, websites and youtube channel!

Offline ethanwu0131

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Re: IKY150N65EH7, is it good for DRSSTC
« Reply #2 on: April 16, 2024, 03:40:53 AM »
Thank you, the page was immensely helpful !

Offline Anders Mikkelsen

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Re: IKY150N65EH7, is it good for DRSSTC
« Reply #3 on: April 16, 2024, 04:57:47 AM »
Infineon H7 is pretty recent IGBT technology, with an impressive combination of low conduction and switching losses. I didn't realize it was on the market yet in 650V. Icm is 600 A, which is pretty impressive for a TO-247 part, and the Vce vs Ic curves really support that these devices can handle a lot of current.

Offline davekni

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Re: IKY150N65EH7, is it good for DRSSTC
« Reply #4 on: April 18, 2024, 04:34:52 AM »
I'd agree, IKY150N65EH7 looks like a very nice part based on data sheet.  4-lead package (Kelvin emitter connection) helps keep switching speed fast even with package lead inductance.
Presuming you use full IKY150N65EH7 capability, 600A or higher OCD, minimizing internal Vce switching spikes will be key, along with keeping sufficient margin between Vbus and 650Vce rating.  My testing of a different part in similar package might be useful:
    https://highvoltageforum.net/index.php?topic=2498.msg18348#msg18348
Construct a low-parasitic-inductance H-Bridge.  May also be necessary to add resistors in series with gate diodes to slow turn-off a bit.  (IGBT turn-off will be much faster than data sheet lists when using bipolar Vge from GDT secondary.  Data sheet is for 0-15Vge and 10ohms in series for both turn-on and turn-off.)  Tune phase lead well.
David Knierim

Offline unrealcrafter2

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Re: IKY150N65EH7, is it good for DRSSTC
« Reply #5 on: April 19, 2024, 01:47:37 AM »
Looks nice from the datasheet! Running a few calculations based of times I think you don't want to push the speed to much, I got 200Khz. It is not worthy it says it's optimized for hard switching. A drsstc soft switches so you might not get as much benefit from that. I've never tried the transistor so I cannot say for sure. Still seems real nice!

Offline davekni

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Re: IKY150N65EH7, is it good for DRSSTC
« Reply #6 on: April 19, 2024, 03:09:29 AM »
Quote
Looks nice from the datasheet! Running a few calculations based of times I think you don't want to push the speed to much, I got 200Khz. It is not worthy it says it's optimized for hard switching. A drsstc soft switches so you might not get as much benefit from that. I've never tried the transistor so I cannot say for sure. Still seems real nice!
I've not used this IGBT myself either, but expect it is capable of more than 200kHz with proper drive and H-bridge layout.  The key "slow" number is turn-off delay.  However, this is with 0-15Vge and 10 ohms gate resistance.  With +-15Vge or +-20Vge and typical diodes in gate drive to reduce turn-off gate resistance, turn-off will be MUCH faster.  That fast turn-off leads to need for low parasitic H-bridge inductance.  Even 13nH of IGBT leads can be problematic as I showed in previously linked thread.  IGBT turn-off at low current (just before zero) will help reduce spikes too since inductance can't be eliminated.  If spikes are still problematic, R+C snubbing on H-bridge (on IGBT C-E) will help further.
David Knierim

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Re: IKY150N65EH7, is it good for DRSSTC
« Reply #6 on: April 19, 2024, 03:09:29 AM »

 


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