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Registered Member #580
Joined: Mon Mar 12 2007, 03:17PM
Location: Melbourne, Australia
Posts: 410
The graph on page 3 says 5A at 200Khz, so i guess if your TC is below both those figures it could work. 10A at 80Khz (it would be a VERY BIG TC to be that frequency)
Registered Member #33
Joined: Sat Feb 04 2006, 01:31PM
Location: Norway
Posts: 971
If you don't already have these IGBTs, I would suggest going for a different one, unless you really need a 1200V device.
The HGTG20N60A4D, for example, can handle twice the current at 150kHz, and is quite a bit faster. It also has a built-in antiparallel diode that you will need to add externally with the IGBT you linked to. And it's a lot cheaper.
This is just an example, there are many different IGBTs that could suit your needs, but I've found the HGTG20N60A4D to be the best value for money for SSTCs so far.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
I'm not sure if I completely understand this, but this is what I think I know;
In normal SSTC, you hard switch the reactive current, which is lagging your feedback reference of the secondary base current. The reactive current is caused by both the magnetizing and leakage inductance, which are effectively in series and causes phase shift - cos fi = R/Z. The real current will be *soft switched* since it's sinusoidal and in phase with secondary base current. The momentary value of current at turn-off will be hard switched and cause losses.
The good way to test your devices is to drive them at wanted frequency, and connect to bare primary coil without secondary coil. This way they will switch only magnetizing current, but also be in ZVS so they should not get too hot. If they are already cooking you know they are way too slow.
Those IGBT's look completely OK for lots of power at 150kHz, they are pretty fast.
The most important thing that so many people ignore is to heatsink them properly, which means absolutely avoid sil-pads and use large, isolated heatsink for each device. Surfaces should be properly greased with a thin and uniform layer, and a clamp should be used over the die since the screw provides pressure on wrong place for the TO247.
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Quick igbt question
