Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post

valerun · 06-21-2011, 05:22 PM

Hi Guys, not sure if I am missing something but what's the point in building your own DC-DC to drive IGBTs again? I mean these are $10 parts at digikey and such - all integrated, with +15/-15V outputs which a perfectly suitable for IGBT modules with +-20V gate drive limits... You can get a 2W version which is sufficient for driving a 400-600A module at up to 12-15kHz (there is no point in using anything higher than 10kHz anyway for a motor controller - you only end up multiplying switching losses). If that's not enough, for ~$25-30 you can get a 10-15W version which can drive an array of enough IGBTs to produce output currents that you shouldn't be trying to produce anyway ;-))

I'm not trying to be a pain but just trying to understand if I am missing some additional motivation...

06-21-2011, 05:22 PM	#83 (permalink)
valerun EcoModding Lurker Join Date: Jan 2011 Location: California Posts: 9 Thanks: 0 Thanked 7 Times in 5 Posts	am I missing something? Hi Guys, not sure if I am missing something but what's the point in building your own DC-DC to drive IGBTs again? I mean these are $10 parts at digikey and such - all integrated, with +15/-15V outputs which a perfectly suitable for IGBT modules with +-20V gate drive limits... You can get a 2W version which is sufficient for driving a 400-600A module at up to 12-15kHz (there is no point in using anything higher than 10kHz anyway for a motor controller - you only end up multiplying switching losses). If that's not enough, for ~$25-30 you can get a 10-15W version which can drive an array of enough IGBTs to produce output currents that you shouldn't be trying to produce anyway ;-)) I'm not trying to be a pain but just trying to understand if I am missing some additional motivation...