Soft-start voltage regulating circuit and generator voltage regulating system thereof

摘要

A soft-start circuit composed of active components and passive components and a soft-start voltage regulator based on this soft-start circuit are disclosed. The soft-start voltage regulator is coupled to a generator, a battery and a starter. When the starter is started, the soft-start voltage regulator receives the voltage of the battery to generate a soft-start signal, enabling the generator to establish a voltage. Further, after the generator established the voltage, the soft-start voltage regulator is shut off and the soft-start signal is outputted.

主权项

1. A soft-start circuit, comprising a voltage regulator and an astable multivibrator unit coupled to said voltage regulator, said astable multivibrator unit comprising an input, an output and a grounding end, said voltage regulator being adapted to provide an operating voltage, said astable multivibrator unit being adapted to receive said operating voltage and to oscillating a soft-start signal for output through said output;
wherein said astable multivibrator unit comprises two transistors, a first resistor-capacitor circuit and a second resistor-capacitor circuit, said two transistors having the emitters thereof respectively grounded, one said transistor having the base thereof coupled to said second resistor-capacitor circuit, said transistors having the collectors thereof coupled to said first resistor-capacitor circuit and the output of said astable multivibrator unit, the other said transistor having the base thereof coupled to said first resistor-capacitor circuit and the collector thereof coupled to said second resistor-capacitor circuit, said first resistor-capacitor circuit and said second resistor-capacitor circuit being adapted to receive said operating voltage.