Until recently, past 20 or 30 years transformers have been either
treated as devices in
signal level circuits or in simple power circuits that did not include
rectifiers. Most power electronics
only considered resistive, and motors ( reactive devices requiring power
factor correction).
Also, power transmission and that was about it.
73
Bill wa4lav
At 07:03 PM 3/7/2013 -0800, Bill Turner wrote:
ORIGINAL MESSAGE:
On Thu, 07 Mar 2013 16:59:40 -0800, Jim wrote:
>
>The equivalent circuit of a transformer is complex -- in addition to the
>leakage inductance, there's resistance in the wire, resistance coupled
>from the core, capacitance between turns, capacitance between windings.
>At power frequencies though, we don't see the inductance or capacitance,
>only the resistance. And if we look into one winding, we see the load
>impedance on the other winding multiplied by the square of turns ratio.
REPLY:
Jim is right. Transformers are deceptively simple as taught in first
semester electronics. In fact, they are among the most complex of all basic
electronic devices. Time spent hitting the transformer books is well spent.
73, Bill W6WRT
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