I think a UPS unit with a ferroresonant transformer (one which is connected in parallel with the battery-backed sockets) would act like a power factor corrector (PFC). Would this make a non-PFC power supply as efficient as a PFC power supply?
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My first choice in quality Japanese electrolytics is Nippon Chemi-Con, which has been in business since 1931... the quality of electronics is dependent on the quality of the electrolytics. -
Re: UPS with ferroresonant transformer acts like PFC?
No.Rest in peace BFG. You were... a job... -
Re: UPS with ferroresonant transformer acts like PFC?
pfc doesn't make things more efficient it, power supply with pfc are higher quality, that's what makes them more efficient not pfc, it actually decreases efficiency just a little bit. All PFC does is not mess up the power grid by making its self look like a pure resistor. I know you didn't know, but now you do
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Re: UPS with ferroresonant transformer acts like PFC?
The Second Law of Thermodynamics, translated into plain English and personalized, means that no matter what you do in life, you lose something. In power terms, anything you do, rectification, a transformer, the power switches, the inductors, the caps, etc. consume at least some power, converting it to heat. This means that when you place a PFC stage in front of the switching regulator, you reduce the efficiency of the over-all power system. A UPS, regardless of topology, is less than 100% efficient. Thus the answer to the question of whether adding a PFC stage or adding a UPS is more efficient boils down to the respective efficiencies of each. I suspect a PFC stage is the more efficient, since it is doing less.
So, what is the point of PFC? Without it, the AC I/P current is high magnitude spikes conducting only at the peaks of the voltage waveform. In a large facility (or neighborhood) full of computers, this can lead to high copper losses in "line" wires, high currents and losses in "neutral" wires, and flat-topped voltage waveforms on the AC power throughout the building. Passive PFC reduces the magnitude of the current spikes and lengthens their duration; active PFC can make the AC current close to sinusoidal or better.PeteS in CA
Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
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Re: UPS with ferroresonant transformer acts like PFC?
For big consumer of elektricicity, it is a mather of money to have a god power factor (at least in Germany). Low PFC increase the power, the plant have to deliver.
PFC regulation dosn`t do mutch on efficiencie, may be it degrades it a bit. But if you have to pay for the blindpower, then it is costefficient to have a pfc regulation in any way.
Pasive PFC means to place an inductor in series with an capacitor, thus an ferroresonant transformer or simple bulb balast can do the job if it has the proper size.
On the other hand, if used for incadeszent bulbs they compensate it with an capacitor in parallel, but most big companies bay EVG or electronic balast, due to the better efficiency, less flikering and an pfc of 0,99.Comment
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Re: UPS with ferroresonant transformer acts like PFC?
Common practice for pulp mills where I grew up is to run a synchronous motor with an over-excited field or some cap banks or a combination of the two for PFC...
Home users are not charged for poor PF in BC, only industrial users.Ya'll think us folk from the country's real funny-like, dontcha?
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Hello!
I'm looking at an original Xbox PSU: Foxlink ftps-0002 rev. B. The 12 V output is too low, and the 5 V output is too (?) high. Unfortunately I don't have an oscilloscope but only a DMM for diagnosis.
Measured voltages with no load:
After rectifier diodes
12V: 6.17 V
5V: 5.67 V
Secondary transformer pins AC measurement (really don't know if this says anything)
12V: 2-2.5 V
5V: 1.04 V
I also have another (working) Xbox psu from Delta. The same measures there, in order, being: 10.79,... -
Hi all,
Got this local made DC power supply (12/14V) given free as the transformer has melted. There is no marking or indication to identify what type or rating of transformer used.
Fyi,. I had a busted autogate mainboard with transformer with marking 13-0-13 . Is this the 13v dc type transformer?
My questions are
1. How do i test to see if the transformer is in good working condition?
2. Can this transformer (marking 13-0-13) be used to replace the melted transformer on the DC power supply?
Hope you guys understand what i was asking. My intention is... -
Hello All,
i would like to post an interesting topic regarding 3-phase stepdown transformer which we suspect to cause an overcurrent (138A) which resulted to power tripped off of the HV power supply (80KV output).
Problem statement: Power tripped Off
Initial Problem: Found 2 IGBT and 2 rectifier diodes shorted (burnt).
Action Done:
1) Replaced the faulty parts with good spare.
2) Measured impedance of the 3phase input lines and found that L2 to L3 has 23.3ohm while other pairs are 51Kohm. This pins will... -
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