Voltage regulator for AC generator with two distinct output voltage

摘要

A voltage regulator circuit for an AC generator having two distinct DC output voltage levels is disclosed, which comprises a full- wave rectifier circuit for rectifying the AC voltages induced in the armature winding of the generator, and a change-over switch which selectively couples the battery and a high voltage load across the output terminals of the rectifier circuit, the negative output terminal of which is grounded. Further, a serial connection of three resistors is coupled across the positive terminal of the rectifier circuit and ground and a rectifier diode is coupled across the positive terminal of the field winding and a junction between the intermediate resistor and the extreme resistor coupled to the positive terminal of the rectifier circuit, the forward direction of the diode being directed from the positive to the negative terminal of the battery in the serial circuit formed by the diode, the intermediate resistor, and the other extreme resistor. The junction between the last named two resistors is coupled to a Zener diode through another rectifier diode, which Zener diode controls the switching of transistors regulating the flow of the field current supplied from the battery. A further serial circuit of two resistors is directly coupled across the battery, the junction being coupled to the Zener diode through still another rectifier diode. The resistors and rectifier diodes constituted a voltage divider circuit which automatically regulates the output voltage of the rectifier circuit to a lower and a higher level according to the position of the change-over switch.