Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Paul & Sabrina's cheap DIY 144v motor controller

MazdaMatt · 01-14-2009, 03:43 PM

Also... i checked your first post link to the MOSFETS... Ten IRFB4110 mosfets... the datasheet claims 180A continuous? wha?

Anyway, the reason i was looking them up was because i found these guys:

IRC640-ND

they have current sense leads coming off of them. Those micro controllers usually have lots of ADC inputs, so the current sense leads could be attached to those. They could be used for single-mosfet-failure sensing, too. Are these powerful enough? (again, i don't know much about mosfets as compared to other electronics).

So you push the pedal and the ADC reads 0.2v, it then ramps up the pwm until the mosfet feedback reads 0.2v (it is a current output, so use the appropriate resistor to match the throttle) and then it stays steady. When the throttle goes up to 2v, it ramps up the current to match it. This is totally RPM-independant.

01-14-2009, 03:43 PM	#197 (permalink)
MazdaMatt Master EcoModder Join Date: Jun 2008 Location: London, Ontario Posts: 1,096 2k2Prot5 - '02 Mazda Protege5 90 day: 33.82 mpg (US) Thanks: 0 Thanked 17 Times in 14 Posts	Also... i checked your first post link to the MOSFETS... Ten IRFB4110 mosfets... the datasheet claims 180A continuous? wha? Anyway, the reason i was looking them up was because i found these guys: IRC640-ND they have current sense leads coming off of them. Those micro controllers usually have lots of ADC inputs, so the current sense leads could be attached to those. They could be used for single-mosfet-failure sensing, too. Are these powerful enough? (again, i don't know much about mosfets as compared to other electronics). So you push the pedal and the ADC reads 0.2v, it then ramps up the pwm until the mosfet feedback reads 0.2v (it is a current output, so use the appropriate resistor to match the throttle) and then it stays steady. When the throttle goes up to 2v, it ramps up the current to match it. This is totally RPM-independant.