Reference frequency and low voltage detector circuit

Details Reference frequency and low voltage detector circuit Reference frequency and low voltage detector circuit

G - Physics

01

R

323/5

G01R 19/00 (2006.01) G01R 19/155 (2006.01)

Patent

CA 1221410

ABSTRACT A reference frequency and low voltage detector circuit for use with a constant frequency A.C. voltage source is disclosed in which a first supply circuit supplies a first voltage wave form having a repetition rate and magnitude proportional to the A.C. source voltage. A second supply circuit supplies a regulated D.C. voltage of a fixed magnitude as long as the amplitude of the A.C. source voltage is normal. The voltages produced by the first and second supply circuits are supplied to noninverting and inverting input terminals of a differential amplifier which produces a rectangular wave output signal only when the A.C. source voltage is normal. The differential amplifier output signal provides a frequency reference under normal conditions and signals a user device to switch to a secondary mode of operation when the repetition rate of the rectangular wave form changes.

462836

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