The secondary winding, which is subject to severe load fluctuation, is arranged in two part-windings in such a manner that one part-winding is only loosely and the other part-winding is tightly coupled to another secondary winding. The part-windings are wound in opposite directions. As a result, load changes of the first secondary winding have no effect on the voltage of the second secondary winding which, as a result, can be kept stable. IMAGE
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