Power frequency detection system

Details Power frequency detection system Power frequency detection system

1986-01-02

1986-11-11

Miller, Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

328136, 328140, 328150, H03K 5153, H03K 500

Patent

active

046224785

ABSTRACT:
A signal transmission system utilizes the building or house wiring as the data transmission line. A frequency detection system is required to detect a frequency of the power voltage. The frequency detection system includes a zero-crossing detection circuit for developing a detection output when the zero-crossing is detected. A timer element is provided in the frequency detection system, which functions to neglect an output signal from the zero-crossing detection circuit for a preselected period of time after the last detection output has been developed from the zero-crossing detection circuit.

REFERENCES:
patent: 3491305 (1970-01-01), Stone
patent: 3493877 (1970-02-01), Jacobson
patent: 3559080 (1971-01-01), Kobori et al.
patent: 3727079 (1973-04-01), Garrett
patent: 3767938 (1973-10-01), Kueper
patent: 3916328 (1975-10-01), Wilson
patent: 3944936 (1976-03-01), Pryor
patent: 4090144 (1978-05-01), Jenik et al.
patent: 4377804 (1983-03-01), Suzuki
patent: 4418333 (1983-11-01), Schwarzbach et al.
"Home Computor Control", by Steven E. Sarns, Radio Electronics, Apr. and May 1984.

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