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Registered Member #55
Joined: Thu Feb 09 2006, 04:56AM
Location:
Posts: 149
I just bought 20 MG200Q2YS40 halfbridge modules. These are NOS, I got them from an old sales rep who had them in his garage forever. Looking at the specs they deffinately arent the fastest thing around but I will give them a try. I will try and get a Fres as low as possible (50Khz range) Has anyone given this one a go? I did a search in the archives and I saw that Neil Thomas started a DRSSTC with these but never finished. Anyone know how that turned out?
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
The resonant primary in a DRSSTC leads to zero current ("soft") switching, which seems to make IGBTs switch more efficiently than you'd expect from the datasheet (the datasheet figures are for hard switching.) Also, the low duty cycle of a DRSSTC (about 1% on to 99% off) lets the devices tolerate huge switching losses without overheating and dying.
For instance, I've seen people push the Powerex CM600HA-24H bricks to drive a 130kHz DRSSTC, although the datasheet recommends 25kHz max. I think that is going too far, but really the only way to find out if a device will work well in a DRSSTC is to try it and see, and post your results here so we all benefit too :P
Registered Member #55
Joined: Thu Feb 09 2006, 04:56AM
Location:
Posts: 149
Thanks for the comments guys. I am going to use them on a large DRSSTC, but first of all I will use one in my meduim DRSSTC. It has a Fres of 80Khz, so I will start there as my ceiling and work down. I will post findings.
Registered Member #76
Joined: Thu Feb 09 2006, 10:04AM
Location: Hemer, Germany
Posts: 458
i bought some of these type a while ago to build a decent drsstc out of them. after some experiments i got dissapointed. the switching time of them is horribly high and you cant get them to work above 80khz. i tried 100 and 120khz too and the switching losses were incredibly high and the gate charge current too. make a nice power amplifier or so, but i doubt that you can use them in a drsstc
Registered Member #55
Joined: Thu Feb 09 2006, 04:56AM
Location:
Posts: 149
Yeah, thats why i was thinking approx 50Khz. What the hell, I will give it a try. I have a 7.5" diameter sonotube seconadary that is 20" long wound with 31AWG wire. I can pile a couple big toploads on it to bring the Fres somewhere around 50Khz. If they dont work, then I will just have to find some other use for them. Reaching: what voltage did the diodes on your blocks clamp at? I noticed in the acrchives someone said something about 30ish Volts?
Registered Member #76
Joined: Thu Feb 09 2006, 10:04AM
Location: Hemer, Germany
Posts: 458
yeah, right, they clamp at 33 volts. you can give them a try, maybe they will work in drsstcs with a dedicated driver or so, i tested em with 2pairs of ucc driver ics. at a fres above 100khz i had a switching current above 1,5A up to nearly 2A. try it out, hopefully youll get em to work
Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
For big bricks like that you will probably want isolated half-bridge drivers on each IGBT in order to get really fast switching speed. GDTs just dont seem to handle really big capacitive loads as nicely as direct drive. Im sure you will achieve some degree of success with those IGBTs.
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
I bought a bunch on ebay and I used them. they are sloooow and with about 10A worth of drive I got the switching times of about 3-4us. they would probly work ok in a tesla of 100khz or less. so if the tesla is big or a well top loaded tesla it might work
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Anyone have success with these bricks in a DRSSTC?
