Preliminary stage of a voltage regulator with low loss of voltage, and voltage regulator with said preliminary stage

摘要

A preliminary stage of a voltage regulator with a low voltage loss to be connected with a further stage of the voltage regulator and comprising an input and output voltage terminals, a common voltage terminal for input voltage and output voltage, a capacitor serving as a charge storage element at an output side of the series preliminary stage, a branch including a transistor having an emitter connected with the input voltage terminal, a collector connected with the output voltage terminal, and an auxiliary collector; a power means for feeding the transistor with a base current, and a current reducing element for reducing current flowing in the capacitor to zero before the transistor reaches saturation when the input voltage and the output voltage falls below a predetermined amount, and including an element for influencing a potential of the collector and connected with the auxiliary collector and the input voltage terminal, and a voltage regulator containing such a preliminary stage.