[Elecraft] KPA1500 240v

[Jim Brown]

Thanks, Josh. I wasn't aware of this relatively new development, which 
is a very positive thing.

73, Jim K9YC

On Tue,4/25/2017 4:01 PM, Josh Fiden wrote:
> 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.