Magnetic amplifier preregulator for linear power supplies

摘要

A linear power supply is preregulated to compensate for variations in load and power line voltage. The inductance on the primary side of the power supply step down transformer is varied by a current controlled inductor to efficiently maintain the desired power supply output voltage. A variable current is supplied to the inductor by a d.c. power source under control of an integrator which monitors output voltage fluctuations. In one embodiment of the invention, a voltage selector is included for use with power supplies which provide more than one output voltage. This selector automatically selects the most heavily loaded output voltage for control of the inductor.