Good question!
The issue of series-connected switching supplies
without the use of a suitable controller is handled by
the HIPOT test first. Most of the module regulators will use the frame
ground as a signal ground and result in
a leakage current despite the polarization of the output terminals. I've
seen paralleled switchers in +24V applications with 75 or 80 amperes on
FG, separate from the
Polarizing Ground going to the Negative Buss Bar.
Now when you get into series-connected switchers
what do you plan on using as the Voltage Reference?
The full string with a seriesed reference lead set
might be thought of as producing the battery voltage equal to the output
of the rectifier module individually, but without the low-impedance
ballast of a storage cell the voltage has
no zero-reference and as such, the module regulators may just decide to
adjust the float due to a current spike or whatever.
Despite all the good news from all the posters who never see any trouble
from these units in whatever configuration they breadboard them into, I
do not trust them as far as I can throw a piano, and that is derived
from personal experience rather than from articles read.
Hal
The test should be conducted from both Positive and Negative DC output
busses of resistance to the Frame. Anything less than MEGOHMS means the
supply is set up for Integrated Grounding.
Hal
W4HBM"
__________________________________________
Hal, doesn't this apply more to parallel configurations such as with
redundant power supplies?
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