FIXED FREQUENCY VOLTAGE REGULATOR

摘要

A fixed frequency, variable duty cycle voltage regulator having a precision reference voltage source (28) is provided. The reference voltage source (28) has a variable temperature coefficient. The output of the precision reference voltage source (28) is combined by a digitally switched attenuator to provide a staircase waveform to a comparator (44). This variable staircase waveform is compared against the output of an alternator (10). The comparator (44) sets the output of a flip-flop (48) to an off state when the staircase waveform goes below the output from the alternator (10). This removes the drive from a current switch (51, 52) which switches off the current flow through the field coil (19) of the alternator (10).