Keep in mind that the current times voltage measured on the input of a ferro resonate power supply does not represent real power. The current is not in phase with the voltage, and the ferro resonate supply returns a lot of the current to the source so this power is not dissipated in the supply or its output load.
This is the same phenomenon that the power company combats when it places a bank of capacitors on a power pole connected across the power line. They are trying to correct the voltage/current phase to try to keep the power factor as close to 1 as they can. Any deviation from 1 means that the extra current flowing on the power line causes extra power loss in the resistance of the line, and also means that the power line cannot carry the same load as it would with the power factor at 1. The ferro resonant supplies do not have a regulator on the output like a normal linear supply - so there is no drop across a regulator to cause extra dissipation in the power supply. Very good efficiencies can be obtained with a ferro resonant supply - with acceptable regulation. 73 - Jim W5ZIT -----Original Message----- From: [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Mon, 15 Jan 2007 3:01 PM Subject: RE: [Repeater-Builder] minor formula typo in formula switching power supplies One other thing that has not been mentioned here, this time. The idle current that the Ferro-resonant supplies exhibit on the input without a load that the switchers don't. Every way I have looked at the problem I can't get past that idle current even when the repeater is not on the air. Wish someone could explain that in a way I could understand. Paul ________________________________________________________________________ Check Out the new free AIM(R) Mail -- 2 GB of storage and industry-leading spam and email virus protection.
