Voltage regulator for an electrical power system

A voltage regulator for an electrical power system including a permanent magnet generator (PMG) having at least one armature winding for generating a PMG voltage, an exciter having an exciter field winding, and a main generator for providing a main generator output voltage, said voltage regulator comprising:

• a clock signal source for providing a system clock signal;
• a controller for multiplying the frequency of the main generator output voltage by a predetermined value to provide a sampling signal having the multiplied frequency and synchronized with the main generator output voltage, and for providing a first sawtooth voltage signal having a repetition rate equal to the frequency of the sampling signal and synchronized with the main generator output voltage and having an incrementing rate dependent upon the system clock signal;
• a reference voltage source for providing a reference voltage;
• means for sampling the main generator output voltage at the frequency of the sampling signal and providing a representation of the sampled voltage;
• a first comparator for providing a difference signal when the reference voltage is greater than the representation of the sampled voltage;
• a second comparator for providing a switching signal when the difference signal is greater than the first sawtooth voltage signal;
• means responsive to the switching signal for switching the PMG voltage;
• and
• means for providing the switched PMG voltage to the exciter field winding.