Microprocessor based electrical apparatrus with false AC input r

Details Microprocessor based electrical apparatrus with false AC input r Microprocessor based electrical apparatrus with false AC input r

1992-12-31

1995-02-28

Gaffin, Jeffrey A.

Electrical transmission or interconnection systems

Switching systems

With operation facilitating feature

307132R, H01H 4700

Patent

active

053940180

ABSTRACT:
False ac signals produced by a noise suppression capacitor across a switch applying a switched ac line voltage signal to a logic input of a microprocessor in an electrical apparatus such as, for example, a contactor or circuit breaker, are phase shifted with respect to a true ac input by inserting two series resistors, and a diode shunting one resistor, between the switch and the logic input. This creates a larger window in which to discriminate between the zero crossings of the true and false ac signals.

REFERENCES:
patent: 3700967 (1972-10-01), Hoss
patent: 4438472 (1984-03-01), Woodworth
patent: 4573040 (1986-02-01), Maltby et al.
patent: 4626698 (1986-12-01), Harden, Jr. et al.
patent: 4748343 (1988-05-01), Engel
patent: 5061879 (1991-10-01), Munoz et al.

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