Help me out here guys...
I thought that conventional power supplies (transformer-bridge-filter) were
relatively clean on reflected harmonics?
Thanks,
Matt
KM5VI
-----Original Message-----
From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Steve Thompson
Sent: Thursday, March 07, 2013 4:06 PM
To: amps@contesting.com
Subject: Re: [Amps] Power factor correction on tube amps
I found these fairly simple guidance notes from the power supply
manufacturer's association:
www.epsma.org/pdf/PFC%20Guide_November%202010.pdf
which say that most equipment over 75W has to meet specs. on harmonic
currents, which equates to needing power factor correction on higher power
items.
Steve
> Hi Peter,
>
> I had a feeling that the EU regs meant that any switching PSU over 100
> W had to be power factor corrected. Does this also apply to non
> switching PSUs such as in tube amps, Ameritron, Alpha etc. which are
> imported? The power factor of the average amp PSU with transformer,
> rectifier and reservoir cap is awful.
> Am I missing something here?
>
>
> 73 John G3UUT
>
> On 07/03/2013 10:05, peter chadwick wrote:
>
> Steve, How much filtering is there to meet EU regs on noise put on the
> mains, and is there any power factor correction circuitry? 73 Peter
> G3RZP
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