That may not be true for the KPA1500. It's pretty common now, especially
in higher power switchers, to include power factor correction (PFC).
Instead of only charging bulk caps at AC peaks when rectifiers are
forward biased, the rectified incoming line hits a boost converter which
smooths out the cap charging rate.
For example, the Meanwell RSP-3000 48V 62A supply, includes PFC and
claims power factor > 0.95. Without PFC, might be PF=0.6 and certainly
operate as you describe with high current peaks, big IR drop & I2R power
losses.
73,
Josh W6XU
On 4/24/2017 8:51 PM, Jim Brown wrote:
...is not sinusoidal, but rather pulses that charge the filter caps at
the peaks of each cycle. So the drop in the wire is even greater than
Ohm's law applied to a sine wave would predict.
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