Author Topic: How do I test the max. Ipk of IBGT  (Read 180 times)

Offline VNTC

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How do I test the max. Ipk of IBGT
« on: February 16, 2019, 05:03:21 AM »
How do I test the max. Ipk of  IBGT

After make a test Ipk of IBGT 60N60 by the common driver used UCC27321+UCC27322 with Transformer-Coupled gate drive. The coupling capacitor caused the ripple at the beginning and at the end of the burn pulses. I am so sorry about this, i was wrong here i just saw the fact of the matter is the energy in the secondary of the GDT and tthe input capaciance of the IBGT build this rear ripple not because the coupling capacitor that cause the front ripple. A trouble occur like this: for example the interrupt give 1 pulse of 100Khz to switching on the transistor in 5us but it has 1 more pulse 25us long after. (Figure 1 load hundred Ω )And more serious, this pulse is the result of a control signal <10v approx.(Figure 2,Vce) So the transistor turn on at the linear operation, this matter can causes the transistor failure with low load resistor. We can say this way cannot used to test max. Ipk of the transistor.
So I used the Bipolar Totem-Pole Driver circuit as in the schematic in figure3 with 1 pair of Tip 2N122+Tip127. I see this circuit is very strong driver x2 or x3 time than UCC27322 ?the square wave drive signal change the shape very little by the load. And also by this circuit we can adjust the amplitude and frequency of the drive signal.
Load reistor .3Ω made by 2 carbon cores of the AAA zinc battery in serial and dipped them in water.
The drive signals is: 4usx100signals/s.
I used the low price 60N60 China product it has the input capacitance too high > 25nf and the test gives some result:
*At 100A ; Vce(sat)=4V approx. 12V at the beginning and down to 4V at the end of the pulses.
*At 500A ; Vce(sat)=12V approx. / gate drive signal 26V (>7.5Kw surge dissipation in the saturation operated interval!) 20V at the beginning and down to 12V at the end of the pulses.(Figure4, 20V/division amplitude)
*Then I adjust the amplitude of the gate drive signal drop to 20V signal Vce(sat) look-like no change. Is it means the internal inductance of S pin no effect on the gate drive signal?? So may we use zener clamping diode 25V at the gate is enough instead of 33V??. How guys think?
* At 600Apk Vce(sat) start at 25V and end at 20V(internal dissipation 12Kw at that moment)
I think we can say the switching of the transistor in this test was hard-switching because it turn-off while it drain high current.
I think in DRSSTC, transistor work as soft switching because it switches near the zero cross and the current wave is sinusoidal.
I am taking an order 10 pieces FGH60N60 from AliExpess. When they come, I will test them something after.
« Last Edit: February 19, 2019, 04:38:04 AM by VNTC »

Offline Mads Barnkob

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Re: How do I test the max. Ipk of IBGT
« Reply #1 on: February 16, 2019, 12:47:45 PM »
How was the heat dissipation during these tests?

You should really build a LC resonant load instead of a pure resistive, this would give you a more precise picture of how it will do as soft switching, as you also mention. Those Vce(sat) values and current should have made those poor IGBTs burn, but you only tested single pulses?

Just two days ago I blew up my DRSSTC1 full-bridge of 60N60, I will post about that when I got time, right now im just busy getting it to run again before I need it functional here on the 25th Feb.
http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

Offline VNTC

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Re: How do I test the max. Ipk of IBGT
« Reply #2 on: February 17, 2019, 03:16:00 AM »
Mr Mads Barnob,
In this test resistor .3 Ωmade by 2 carbon core of the AAA battery in serial and embedded in water. Power consumption for 100x single pulse/s 600A/200VDC is about 100w.
500A/170VDC 100x10 pulses/s  300w
Yes, You say exactly I intend to do so, i will test L1C1(without L2C2) at resonance when components that  i order arrive.

Offline VNTC

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Re: How do I test the max. Ipk of IBGT
« Reply #3 on: February 19, 2019, 04:54:44 AM »
In every interrupt, long or short time always has the front ripple and the rear ripple.
The front ripples cause by the coupling capacitor and the primary inductance of the GDT. The rear ripples cause by the input capacitor of IGBT and the secondary inductance of the GDT. At that moment they make the signals become bad even very bad. I hate them and try to remove them but so hard!
When used direct coupling without GDT this matter will not present.

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Re: How do I test the max. Ipk of IBGT
« Reply #3 on: February 19, 2019, 04:54:44 AM »

 


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