Thankyou...Easy Peasy is of course, correct about the ripple current in each Half Bridge rail splitter capacitor....ie approx 10-11 Amps. However, that is what it would be for a "standard" Half Bridge converter.Adding vectorially, for a single cap we get SQRT ( 7.2^2 + 7.5^2 ) = 10.4 amps rms each ( approx ) at full power.
The intended application of these capacitors is to create some phase lead for particular motor windings, and for power factor correction to the 50/60 Hz mains supply voltage. The ripple current will always be within some safe assumed range limited by Xc. They are quite adequate for that.So the ripple current rating is given by VAC(rated)/Xc?
Where Xc = Xc at 50Hz and with 12uF
Thanks, this is the crucial bit, that blasts these motor capacitors out of the water as rail splitter caps for a 565vin 3.6kw half bridge smps....but then there's that other side of me that wonders.....maybe motor capacitors are just tough capacitors, that can survive ....and the 28Arms of ripple current will end up "water off a ducks back"?.....and the transformer has loads of leakage inductance anyway, so maybe a bit extra ESL in the cap isnt gonna hurt too much? Just wondering how much of a biggy it really is about these motor caps being "not right for the job"?They have a wound foil type of construction, with a single connection to one end of the foil. As a result there will be significant series inductance and series resistance. The performance at higher frequencies will not be good.
If you start running very high pulsed current, it will very likely fail open circuit due to the very high current density right at the start of the foil winding.
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