It's for electric vehicle conversion. I have a 3 phase 10hp motor that I will drive with a 30hp controller. I've purchased both of these, and have hit a snag in that my controller's bus voltage would ideally be at 650Vdc.
I'm not ready to drop the $2K required for lithium cells.
I have a cheap source of lead acids but they weight 30lbs each.
Putting 56 cells X 30lbs gets over my Chevy Metro's weight target by far.
If I could boost from a lower voltage I would be able to reduce the amount of cells required as my duration requirements are light.
At this stage I'm not locked into any particular topology but I've been leaning towards a full bridge DC-DC or a interleaved boost regulator.
I have though about making use of a dozen salvaged microwave oven transformers in parallel to meet my power requirements and provide the large differential in voltage. I measured a few of these to be about 16:1.
They are typically 1kw each and if I keep the switching frequency at about 40khz I'm hoping the iron core transformer loss will be tolerable. I still have some doubts about this approach and am actively looking into winding my own transformer.
I'd like to get away with about +70% efficiency if possible.
An online tool at
www.poweresim.com spits out this schematic when I plug in my requirements: http://goo.gl/akeHg
I work in electronics engineering for over 10 years, but mostly low power. I have training with high power and am comfortable with this high power project. This is not for everyone!!