Recently experiencing a true Renaissance resistor [1] and transistor [2] the power regulators. They are the most uneconomical.
To increase the efficiency of the regulator [2] as the regulator [1] enable diode (see figure).
When this is achieved a more convenient throttling limit (50-100%).
Semiconductor devices can be placed on a radiator.
Literature
Author: Y. I. Bearded, Ivano-Frankivsk region.