Bill,
As I understand it - and quite likely I' m wrong - with a normal rectifier and
input C, the rectifiers draw current only when the transformer volts exceed the
reservoir capacitor volts. This puts a large harmonic component on the input
which isn't in phase. Using a switching 'boost inverter' allows the supply
current to effectively see a resistive load.
I know the people at Alpha were telling me that meeting EU requirements was
difficult with a usual transformer/ rectifier/capacitor supply, but I don't
know how they got over that.
With some years of professional experience regarding EU requirements and their
development, I personally feel that the Commission people have all demonstrated
that they are a useless load of idiotic incompetents, busily trying to
legislate things they do not understand.......
thank heavens I've retired.....
========================================
Message Received: Sep 27 2013, 05:04 PM
From: "Bill Turner" <dezrat1242@yahoo.com>
To: "Amps" <amps@contesting.com>
Cc:
Subject: Re: [Amps] Direct rectification of AC mains to drive the amp,
ORIGINAL MESSAGE: (may be snipped)
On Wed, 25 Sep 2013 10:10:06 +0930, you wrote:
>
>Yes all that you mention below is correct Jim. That's why I commented in an
>earlier post that an individual QRO amp builder would get away with doing
>this questionable 3 kW power supply realization technique, but no commercial
>SS amp manufacture would be able to do this due to the electrical codes in
>respect of EU power factor rules and product compliance certification.
REPLY:
Power factor correction is an area I am a bit hazy on. Could someone explain
why the power factor would be different between a direct-rectified PS and a
transformer-isolated one? Either one charges the capacitors with a series of
pulses. What's the difference in power factor?
73, Bill W6WRT
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