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e*clipse
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Join Date: Jul 2010
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Quote:
 Originally Posted by MPaulHolmes That looks like a good way to split it up. I'll do that. I was thinking more about the boosting. Here's my attempt to figure out the boost current requirement without simulation, just so I can get my head wrapped around it. Let's say we are doubling the DC voltage: DC Power from batteries = Vbatt * Ibatt DC Power from the capacitor bank to the 3 phase inverter = Vcaps * Icaps = 2*Vbatt * 0.5*Ibatt Now, the power to the 3 phase inverter is PowerInverter = 1.5 * Vcaps * IphasePeak (I always use this one. it's my favorite format) So, 1.5 * Vcaps * IphasePeak = Vcaps * Icaps. So, 1.5*IphasePeak = Icaps. So, 1.5*IphasePeak = 0.5*Ibatt So, 3*IphasePeak = Ibatt.
Ok, so let's say we have a 75kW inverter and Vcaps = 650V
75kW = 1.5 * 650V * IphasePeak
IphasePeak = 76.9A Great! NBD for 3 TO-247 switches.

So what I was advocating was to run the battery voltage closer to the bus voltage. In the example I worked out, Vbatmin = 144 cells * 3.25V (below that, there's not much power available anyway)
Vbatmin = 468V or 468V/650V = 0.72