Load selective power systems

Details Load selective power systems Load selective power systems

1975-03-17

1976-12-14

Miller, J D

317 18R, 317 52, H02H 700, H02H 102

Patent

active

039978184

ABSTRACT:
A load selective circuit in which the dangers associated with accidental contact with conductors and terminals, sometimes causing electrocution, are eliminated even during the time a proper load is connected to the supply circuit and is deriving power through it from an alternating current source. Such a proper load must include a unidirectional current device in series with the load. Half-wave power can be supplied to a load with one such current device and with only two load terminals, whereas full-wave power can be supplied to a load with two such current devices and three load terminals. The supply circuit for half-wave includes a resistor-capacitor phase control SCR circuit; and for the full-wave, two such SCR circuits are included. Various other details include 1) a bridge circuit between two of the three terminals of the full-wave supply to turn off one half-wave when only the other half-wave is shorted; 2) a bidirectional load circuit; 3) AC and DC full wave load circuits; 4) and monitor circuits for connecting in the load circuit which will indicate certain faults in the supply circuit.

REFERENCES:
patent: 3350607 (1967-10-01), Jones
patent: 3525921 (1970-08-01), Wattson
patent: 3781608 (1973-12-01), Geiger

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