Friday 25 July 2014

Switching between taps of transformer


What's the difference between this two methods of "tap switching"? do they work the same?


schematic


simulate this circuit – Schematic created using CircuitLab



Answer




No, the circuits are not the same.


I removed the "fluff" (the rectifiers are irrelevant) and added labels.


schematic


simulate this circuit – Schematic created using CircuitLab


The top circuit can output 4 different voltages if the voltages across the separate windings are all different.


The bottom circuit can only output 3 different voltages, when S2b is in the "C" position, switch S2a does nothing.


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