Cycle timer for household appliance

Details Cycle timer for household appliance Cycle timer for household appliance

1988-04-08

1989-08-15

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Switching systems

Switch actuation

307141, 307132E, 3071414, 219302, 99285, 99280, 99286, 361 72, 361 73, 368 82, 200 38R, H01H 4300

Patent

active

048577588

ABSTRACT:
A hybrid analog and electronic cycle timer has a mechanical movement and cam-operated cycle switch driven by a low-RPM synchronous motor. Electronic control logic divides the power line frequency to obtain pulses for pulsing the synchronous motor. The control logic also includes an activation interval timer and a lockout flip-flop which inhibits the activation interval timer. The activation interval timer is otherwise triggered by closure of the cycle switch. The lockout flip-flop is set after a power failure and at the end of the activation interval, and is reset by a manual reset signal. The activation interval timer may include an activation enable flip-flop and an activation interval counter. The state of the control circuit is conveniently indicated by an indicator which is activated continuously during the activation interval, and which is activated intermittently when the activation interval timer is inhibited by the lockout flip-flop. The control logic is preferably included in a single CMOS integrated circuit.

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TMS 345ONL Led Duplex Digital Radio Clock, Integrated Circuit Data Sheets, pp. 143-156.

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