Re: [Elecraft] KPA1500 240v
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. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] KPA1500 240v (was: Another really good reason to come to the Visailia DX convention this weekend...)
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. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
