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NiHaoMike · 09-13-2009, 12:41 AM

500w or so DC motor attached to rear axle with a simple PWM controller using a relay to switch to regen mode. Normally, the positive side of the motor would connect to the positive supply and the negative side to the PWM, but engage regen and the positive side reconnects to the PWM and the negative side to ground. http://techno-fandom.org/~hobbit/cars/boost-hack/

A high side MOSFET can provide for synchronous rectification and regen without a relay, but there isn't much to gain from synchronous rectification and a regen relay would likely be simpler and cheaper.

09-13-2009, 12:41 AM	#4 (permalink)
NiHaoMike Master EcoModder Join Date: Sep 2008 Location: Texas Posts: 632 Thanks: 0 Thanked 26 Times in 24 Posts	500w or so DC motor attached to rear axle with a simple PWM controller using a relay to switch to regen mode. Normally, the positive side of the motor would connect to the positive supply and the negative side to the PWM, but engage regen and the positive side reconnects to the PWM and the negative side to ground. http://techno-fandom.org/~hobbit/cars/boost-hack/ A high side MOSFET can provide for synchronous rectification and regen without a relay, but there isn't much to gain from synchronous rectification and a regen relay would likely be simpler and cheaper. __________________ If America manages to eliminate obesity, we would save as much fuel as if every American were to stop driving for three days every year. To be slender like Tiffany Yep is to be a real hypermiler... Allie Moore and I have a combined carbon footprint much smaller than that of one average American...