Patent ID: 8013582

Claim:
A voltage control circuit comprising: a first transistor having a collector connected to an input terminal provided with an input voltage, an emitter connected to an output terminal outputting a controlled voltage, and a base connected to a first node; a first resistor connected between the input terminal and the first node; a second resistor connected between the first node and a second node; a second transistor having a collector connected to the second node, and an emitter connected to a third node; a third transistor diode-connected in a forward direction between the third node and a fourth node; a third resistor connected between the fourth node and a ground voltage; a fourth resistor connected between the output terminal and a base of the second transistor; a fifth resistor connected between the base of the second transistor and the ground voltage; and a fourth transistor connected between the first node and the ground voltage, the fourth transistor having a conductive state controlled by a voltage of the second node.