Anti-short-cycle circuit
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United States of America Patent
Stats
-
Feb 5, 1991
Grant Date -
N/A
app pub date -
Oct 12, 1989
filing date -
Oct 12, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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