Apparatus for generating digital signal synchronized with phase

Details Apparatus for generating digital signal synchronized with phase Apparatus for generating digital signal synchronized with phase

1991-09-16

1994-02-08

Ruggiero, Joseph

Boots, shoes, and leggings

323241, 328155, 364483, G05B 1502, G01R 1900

Patent

active

052853748

ABSTRACT:
The microcomputer reads phase difference angle data latched at the leading edge and the trailing edge of a binary logic signal composed depending on the polarity of each phase voltage of an a.c. power supply and compares the phase difference angle data with a predetermined value. Then, proportional plus integral operation is performed about the compared deviation so as to reduce the deviation to zero. The resulting value is sent to an integrating circuit in which the integrating operation is cleared and re-started each time the integrated value reaches a predetermined value. The leading inclination of the integration signal obtained by the integrating circuit changes depending on the value of the input signal. By latching the value of the integration signal at the leading edge and the trailing edge of the logic signal, the phase difference angle data can be modified. As such, if the a.c. power frequency is changed out of a constant state, the microcomputer automatically operates to direct the read phase difference angle to a command value as close as possible and to pick up a signal synchronized with the phase of an a.c. power supply and matched to a predetermined value from the latch circuit.

REFERENCES:
patent: 3657732 (1972-04-01), Krause
patent: 4484152 (1984-11-01), Lee
patent: 4564819 (1986-01-01), Hirose
patent: 4903283 (1990-02-01), Eisenberg
patent: 4916403 (1990-04-01), Sudoh et al.

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