Electricity: electrical systems and devices – Safety and protection of systems and devices – Motor protective condition responsive circuits
Patent
1976-05-06
1977-08-16
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Motor protective condition responsive circuits
361100, 361114, H02H 708
Patent
active
040429652
ABSTRACT:
Apparatus for the prevention of undesirable and possibly hazardous automatic application of power to a load in the event of an outage from a power source and a subsequent re-application of power therefrom. Described is a thyristor type of circuit interrupter coupled into a control circuit which is operative to control the operation of phase-controlled SCR circuit which is cyclically operative to couple power from an AC power source to a load device such as a DC motor. In the preferred embodiment, an SCR circuit interrupter is coupled into the DC supply circuit of a control circuit comprising, inter alia, a pulse generator which provides trigger pulses which are applied to a pair of silicon controlled rectifiers in the phase-controlled SCR circuit.
A two-pole, two-position switch is adapted in one (STOP) position to couple the AC power source to the SCR circuit interrupter which includes means for being latched, i.e., rendered conductive and remaining conductive for a short time interval following the removal of the AC therefrom. The switch is then thrown to the other (RUN) position, whereupon the AC source is disconnected from the SCR circuit interrupter and applied to a semiconductor rectifier bridge circuit and phase-controlled SCR circuit. The rectifier bridge circuit immediately supplies DC power to the pulse generator through the now conductive SCR circuit interrupter. In the event of an outage from the AC source, however, the SCR circuit interrupter will become nonconductive rendering the pulse generator inoperative which will remain non-conductive until the switch is moved to the STOP position.
REFERENCES:
patent: 3555386 (1971-01-01), Wisman
patent: 3903456 (1975-09-01), Schaefer
patent: 3958164 (1976-05-01), Hess
Fishburne, Jr. B. P.
Moose Jr. Harry E.
T. B. Wood's Sons Company
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