DC CHOPPED POWER SUPPLY FROM AN AC VOLTAGE

摘要

The power supply unit is an AC/DC voltage converter with an insulating transformer (3) whose primary voltage (4) is chopped by a transistor (8) at a fixed duty ratio. The secondary voltage (5) is chopped and smoothed by means of a switch or interruptor or transistor (10). The DC voltage at the load (1) connections is controlled by means of a comparator (17) and a multivibrator circuit (19) which controls the switch or transistor (10) in the secondary circuit. …The power supply unit can regulate the voltage for a plurality of loads with a constant accuracy in that a plurality of mutually comparable circuits are connected to the secondary winding of the single transformer. Such a power supply unit is particularly suitable for telex machines (Fig. 1). ……