Anti-short-cycle circuit

Details Anti-short-cycle circuit Anti-short-cycle circuit

1989-10-12

1991-02-05

DeBoer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 22, 361 29, 361 75, 307141, 3071414, 307632, H02H 1100

Patent

active

049910493

ABSTRACT:
A protective time delay delay circuit delays energization to an electric load until a predetermined time has elapsed from a previous deenergization. A transistor has its emitter connected to an ac conductor and has its base coupled to an RC timing circuit. The collector is connected to the gate of a triac whose current electrodes are coupled to the thermostat conductor and to a load device. A small resistor and a zener can be connected to the transistor to provide brownout protection. A temperature sensitive resistor can be included to increase or decrease the lockout period as a function of temperature. This resistor can be remotely mounted in thermal proximity to the load to be protected. A thermistor placed in parallel to latching capacitor can provide thermal overload protection.

REFERENCES:
patent: 3553495 (1971-01-01), Shaugnessy
patent: 3742302 (1973-06-01), Neill
patent: 3755695 (1973-08-01), Krick et al.
patent: 3883782 (1975-05-01), Beckwith

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