Patent ID: 9190945
Filing Date: 2015-11-17
Classification: H02H,H02P

Abstract:
1. A voltage regulator, configured for regulating the electrical power generated by a rotor coil of a batteryless alternator, comprising: an under-voltage protection circuit coupled between the batteryless alternator and a ground, the under-voltage protection circuit comprising: an exciting current regulating unit coupled to the power switch, operatively controlling the operation of the power switch according to the output voltage to regulate the current flow through the rotor coil; wherein the voltage detection unit detects whether the output voltage is lower than a threshold, and the voltage detection unit outputs the first control signal according to the detection result to sequentially control the operations of the switching circuits so as to selectively cut off the power switch; wherein when the voltage detection unit detects that the output voltage is lower than the threshold while the exciting current regulating unit turns on the power switch, the voltage detection unit sequentially controls the switching circuits cutting off the power switch.