Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Patent
1979-10-25
1980-12-30
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
340645, 361104, 361112, H02H 326
Patent
active
042427134
ABSTRACT:
A circuit for protecting an AC driven load that is controlled by a solid state device, such as a triac, or inverse SCR's, or the like. Whenever the AC power output of the control is asymmetrical to the load, the circuit produces a signal capable of shutting down the AC power to the load, sounding an alarm, switching to a different controller, or signaling another load protecting reaction. The protection circuit continuously measures each individual half cycle of the AC output from the controller to the load and provides for phase shifting about a reference point, resulting in summing (or nulling) of the AC output half waves (positive and negative) at the reference point. The summing (or nulling) reference point is coupled to the gate of a switching element connected across the AC input line, the switching element being responsive to a positive or negative voltage above a predetermined threshold value. Half wave failure of the load controller resulting in an asymmetrical power output from the controller to the load creates a net charge, positive or negative (at the reference point). Whenever the net voltage at the reference point reaches the threshold voltage of the response switch, the load protecting response switch will be triggered.
REFERENCES:
patent: 2151753 (1939-03-01), Etzrodt
patent: 2394084 (1946-02-01), Livingston
patent: 2438742 (1948-03-01), Farrow
patent: 2774940 (1956-12-01), Bernet
patent: 3302064 (1967-01-01), Redmond
patent: 3486073 (1969-12-01), Eriksson et al.
patent: 3515896 (1970-06-01), Swing et al.
patent: 3532900 (1970-10-01), Rhyne, Jr.
patent: 3644783 (1972-02-01), Snyder
patent: 3660720 (1972-05-01), Samm et al.
patent: 3686511 (1972-08-01), Pauly
patent: 3693047 (1972-09-01), Hamstra
patent: 3717793 (1973-02-01), Peterson
patent: 3794811 (1974-02-01), Hehl
patent: 3857083 (1974-12-01), Lundstrom
patent: 3936702 (1976-02-01), Plasko
patent: 4038584 (1977-07-01), Tarchalski et al.
Goodrich Edward W.
Kline Dale W.
Lewis, Jr. Raymond H.
Haley Barry L.
Malin Eugene F.
Moose Jr. Harry E.
Wadsworth Philip R.
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