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Registered Member #102
Joined: Thu Feb 09 2006, 08:15PM
Location: Raleigh, NC
Posts: 169
So I've bought a couple of these bricks from my local surplus guy. They are about 20 years old! At first I figured they were just too slow. but then I actually looked them up: I've searched and searched, but I cannot find that anyone has used them specifically for a bridge inverter for a Tesla coil. So I wanted to get the opinions of you guys. Compared to the cm300dy12 they appear to be faster. They also appear to have a higher dissipation rating (not really important) and a similar voltage drop. Finally their switching speeds are almost the same for turn on and off. Which I think means that less dead time is needed.
The secondary and top load calculate out to about 81khz. Is there any reason these _very cheap, and plentiful_ bricks would be a bad choice? Thanks guys, in advance.
So I've bought a couple of these bricks from my local surplus guy. They are about 20 years old! At first I figured they were just too slow. but then I actually looked them up: I've searched and searched, but I cannot find that anyone has used them specifically for a bridge inverter for a Tesla coil. So I wanted to get the opinions of you guys. Compared to the cm300dy12 they appear to be faster. They also appear to have a higher dissipation rating (not really important) and a similar voltage drop. Finally their switching speeds are almost the same for turn on and off. Which I think means that less dead time is needed.
The secondary and top load calculate out to about 81khz. Is there any reason these _very cheap, and plentiful_ bricks would be a bad choice? Thanks guys, in advance.
Notice that in most Powerex IGBT datasheets, the switching times are given for a resistive load while the Toshiba ones are given for an inductive load. Inductive switching can lead to faster rise times than resistive switching by resonant charging of the output capacitance of the transistor, so it may not be as fast as one would think. The datasheet looks like it was back from 1997(?) though, so they have less robust technology than today's bricks, and may not do so well especially at the higher voltages. However, I note that older IGBTs tend to be a bit more over-engineered (e.g. the popular 40n60 miniblocs seem to be very robust and performed well over the specifications), as newer technology allows the shrinking of die size.
Otherwise, a quick comparison with all the main characteristics does seem to indicate that this IGBT looks fairly similar to the 12H, and should be good for use. Sadly the only time I got to try a Toshiba IGBT was a failure because one of the transistors I got (from eBay) was shorted on arrival so I never got to build my Toshiba bridge. Would be happy to hear if anyone else has had any experience with these bricks.
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igbt module up for your reveiw.
