Fixed frequency voltage regulator

Details Fixed frequency voltage regulator Fixed frequency voltage regulator

1981-12-17

1983-06-14

Shoop, William M.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

320 64, 322 28, 323322, G05F 156

Patent

active

043885861

ABSTRACT:
A fixed frequency, variable duty cycle voltage regulator having a precision reference voltage source is provided. The reference voltage source is a bandgap reference circuit including a plurality of series-connected diodes and having a variable temperature coefficient. The output of the precision reference voltage source is combined by a digitally switched attenuator to provide a staircase waveform to a comparator. This variable staircase waveform is compared against the output of an alternator. The comparator sets the output of a flip-flop to an off state when the staircase waveform goes below the output from the alternator. This removes the drive from a current switch which switches off the current flow through the field coil of the alternator. Current limiting protection is provided to the regulator output.

REFERENCES:
patent: 3631258 (1971-12-01), Eisenstadt
patent: 4054820 (1977-10-01), Foster
patent: 4346338 (1982-08-01), Nakamoto et al.
patent: 4360773 (1982-11-01), Voss

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