[Amps] Freescale LDMOS devices

Carl km1h at jeremy.mv.com
Sat Mar 9 10:33:15 EST 2013


A correction cap also works for a choke input PS using an old style 
transformer with a high Z compared to modern designs.

Carl
KM1H


----- Original Message ----- 
From: "jeff millar" <wa1hco at wa1hco.net>
To: <amps at contesting.com>
Sent: Friday, March 08, 2013 11:34 PM
Subject: Re: [Amps] Freescale LDMOS devices


> On 03/08/2013 04:51 PM, Carl wrote:
>> So install a power factor correction cap at the mains panel.
>>
>> Carl
>> KM1H
>
> Using a power factor correction cap works when the load is a bunch of 
> inductive motors.  But it won't really work for the pulse type load from a 
> capacitor input filter.
>
> Power meters measure RMS current and RMS voltage. But Watts RMS only equal 
> V rms x I rms when the power factor is 1.  For lower power factors you pay 
> for Vrms x I rms which is greater than Wrms.
>
> The surplus 50V DC power supplies for LDMOS transistors are always power 
> factor corrected.
>
> From an operating point of view, the PFC type power supplies cause a lot 
> less flicker in the lights when operating high power SSB...which could be 
> either good or bad depending on what you're going for.
>
> jeff, wa1hco
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