Operating 2 supplies in parallel without isolating diodes works
until one power supply output shorts out, then takes both supplies
down..Isolating diodes should always be used or other method to
isolate the 2 power supplies in case of failure
On 4/18/2025 18:48 PM, John via
groups.io wrote:
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Any what
to look out for situations for this, besides matching
voltages?
?
I took an
Astron SS-30M that was not switched on and back fed 5-18VDC
from a metered regulated bench supply to it. With initial
switch on at 13.8V from the bench supply, the? "on" current
was 200mA that soon dropped to 10mA. The volt meter on the
SS-30M then read 13.8V. SS-30M analog amp meter still at zero
to the eye.
?
From that
test , it appears that no isolating diodes from SS-30 power
supplies to common output would be required, and as long as
the output voltages are equal, both supplies should carry half
of the required current. It seems it would be best would be to
use SS-30M supplies so the equal current draws can be
confirmed visually, but not really necessary if equal voltages
stay equal.?
?
If
available, is it significantly important or just preferred to
connect both? supplies voltage sensing leads?? The SS-30
supplies? do not have externally reachable sense wires, but if
really needed, they could be brought outside the case.
?
John
?
?
