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Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Oh come on, that's like asking "What is the best tire for a car".
Most people use whatever MOSFET they can find cheaply at their local surplus electronic store or on Ebay. The IRFP250, IRFP460 etc are old favourites.
The MOSFETs need to be rated for pi times the supply voltage. If you want to run the thing off a high voltage, IGBTs start to become attractive. Mazzilli's original oscillator actually ran off 320V DC and used 1200V IGBTs: the BUP314D from Siemens/Infineon, which was available cheaply in Europe at the time.
And by the same token, if you only have a very low voltage power supply, like a 12V battery, then you should be looking at 50V or 100V MOSFETs, these are available with extremely low Rds(on) for efficient operation.
So, in other words, it depends on what kind of car and where you're going to drive it.
Registered Member #2563
Joined: Mon Dec 21 2009, 10:17AM
Location: Australia
Posts: 280
Steve McConner wrote ...
MOSFETs need to be rated for pi times the supply voltage. If you want to run the thing off a high voltage, IGBTs start to become attractive. Mazzilli's original oscillator actually ran off 320V DC and used 1200V IGBTs: the BUP314D from Siemens/Infineon, which was available cheaply in Europe at the time.
Well you learn something new every day, thanks for the fun fact!
Registered Member #3610
Joined: Thu Jan 13 2011, 03:29AM
Location: Seattle, WA
Posts: 506
I'm using IRFP240s in one, but almost any mosfet with sufficient voltage and current ratings for the power you wish to run it at will work. With low resistance mosfets you don't even need a heatsink in most cases, but I did blow a mosfet once due to thermal runaway when I was pushing ~400W through the driver to do induction heating so a small heatsink is recommended.
If you want to run it from higher than about 60V, I recommend improving the gate drive arrangement a bit, something like this There are of course a zillion different choices for the gate driver and since they're both low side you don't have to use fancy expensive HV floating gate drive ICs.
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best mosfet
