Quote:
Originally Posted by mrbigh
well, the basic of designs are almost the same, these are simple circuits though that need to be scalled up.
I have the same concept in my ManzanitaMicro PFC40 HM AC-DC/DC charger
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I'm seeing the boost converters/power factor corrector everywhere now too
I'm starting to have faith that they do some good.
Anyone have any ideas how to size the components for the boost converter and the caps on the DC bus? And how to control it?
there is a:
coil: maH and amps
an igbt to charge the coil: amps, volts, (frequency and duty cycle or controller controlls it based on demand or feedback?)?
Large caps to smooth out the DC bus: volts, farads.
Probably a faster small cap too.
So given some parameters, like pack voltage and current, vs motor current (average) is there a procedure for selecting component the boost converter (and controlling it?).
You probably have to size it for a worst case, then turn the igbt booster way down when demand is low. That DOE doc showed it being most active during early acceleration (starting to remind me of the series parallel switch on the white zombie/KillaCycle).
And you have to not overcharge the inductor, cuz that would be inefficient.
So, for example, lets say pack voltage is 100, and can supply up to 400 amps reliably, and you want to throw an average of 200 amps (ignoring conversion losses for a sec) at your igbt array. Also, will the voltage output of the boost converter naturally follow the motor rpm (up to 200volts in this case)?