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ELKO electronics forum and the PTB

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Lustig is the discussion, when a phalanx forums at all costs will have right to the physical principles is to the head and hands out this powerful!

elektronik-kompendium.de/forum

Piquant is the thing, when one brags that user in the forum so to act as an employee at the Physikalisch-Technische Bundesanstalt. (Read the PS.) confirmed The press office of the PTB me on 28.07.10 by telephone that a gentleman was there with the name actually work! I call him here in the following text xy .

What is this? Nothing more than the calculation of efficiency.
on this calculation, the efficiency:

http://de.wikipedia.org/wiki/Wirkungsgrad

The determination of the efficiency is the forum out completely absurd. For, according to Mr xy besides the fed and the dissipated energy can now also smuggled by the energy considered. Later, you are completely obsessed and can by majority vote the thread close . (29.07.10) Of course, not without taking leave a few insults . This is the Waterloo have damaged the root Poster in ELKO forum which I believe the reputation of the Physikalisch-Technische Bundesanstalt.

Mr xy writes to me in Forum "OOCH, if I see someone will take the mickey, I am also to tolerate and even the echo. "
Here you are, you are reading the echo! work to meet

way what requirements you have for the PTB, declares the Lord here xy :

elektronik-kompendium.de/forum/board_entry.php id = 71992nd ..

My tip for the Physikalisch-Technische Bundesanstalt: Just ask your candidates to the formula for calculating the efficiency
! Solution: n = P_ab / P_zu
;-)

in their own right:

An autotransformer has a higher efficiency than a solid transformer
(This I call here. a transformer with separate primary and secondary. )

-envelope calculation to a practical example: A

Verstäker for 220VAC to 230VAC should be used.
Power consumption 130W.

According to Wikipedia, we expect there once with the reported 90% efficiency for a full-alone transformer.

So, efficiency is defined as P_ab / P_zu when using a full-transformers are 90%.

Now you want to know, as a full-transformer auto-transformer by on secondary and primary winding in series. This requires, for example, a transformer from the 220VAC, 10VAC power.

Since this consumer power at 10V only must provide sufficient, a 6VA transformer, autotransformer connected as to provide for the 220VAC 130VA ready.

is the loss at 130W_ab with the autotransformer 0.6 W compared to 13W with full transformer.
So autotransformer efficiency over 99% over the full transformer with 90%


I get frequently tube equipment in the workshop, in which the heating voltage is not correct. (Usually it is too high.)
a full transformer before fix is useless because it is too vulominös, increases the internal resistance of the unregulated power supply and the efficiency unnecessarily worse, as we now know.
connected with a small transformer, as autotransformer, I bring the 230
from the mains then the required input voltage needed by the apparatus.
I have several small transformers for debugging in stock that I switched, as-wound, the energy-efficient adjustment of the voltage used.

last updated on 08/02/2010 (left) were added. should

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