Speaking of electric vehicles, are there any commercial models available now? It was a hot topic in the power electronics world once upon a time. One of my friend, an Intersil engineer but later changed gear to study dancing, once went to an interview at Southern California Edison. They wanted to explore the possibilities to set up charging stations for electrical vehicles. I think the idea never materialize. I've seen quite some prototypes of electrical vehicles. Most of the time they stays near the charging stations on university campus or company research centers... 2000A at 400V, that is a lot of power! I've seen some electric vehicle power controllers (10s of Kw or more, I can not remember) in the GM advanced research centers in Torrence. Pretty impressive design. The communication and diagnosis system as well as SMPS control are using DSPs+MCUs. It is said the inductor design is one of the most difficult. The cooling system and EMC things are also not easy. Regards, Xiaofan -----Original Message----- From: Martin Klingensmith Sent: Thursday, September 29, 2005 5:00 AM To: Microcontroller discussion list - Public. Subject: Re: [EE] VFD for 1 phase AC motor Many people still use DC in their electric vehicle conversions because less silicon is necessary (cheaper controller) and high power series motors are easier to come by than 3-phase AC. Here is a DC motor controller that does 2000 amps at 400v: As a side note, this is a battery charger that can put out 50 amps at 450v: In PFC-boosted topology! -- Martin Klingensmith http://wwia.org/ http://nnytech.net/ -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist