Garage door operator with motor control circuit fault detection

Details Garage door operator with motor control circuit fault detection Garage door operator with motor control circuit fault detection

1997-03-25

1998-11-24

Wysocki, Jonathan

Electricity: motive power systems

Motor-reversing

318466, H02P 300

Patent

active

058412530

ABSTRACT:
A garage door opening and closing apparatus having improved operational safety is disclosed. The apparatus includes a control circuit which responds to a number of input stimuli to generate commands to open and close a garage door as well as to stop garage door movement. Three relays respond to the commands via drive circuitry to actually connect door operating voltages to the windings of a door controlling motor. By redundancies in the operation of the three relays, faults in the operation of those relays result in safe door operating conditions. Additionally, the control circuitry upon issuing a door stop command, performs a test to determine whether or not the door is still moving. If the door is still moving, door up commands are generated by the control circuitry to place the door in a safe position.

REFERENCES:
patent: 4035702 (1977-07-01), Pettersen et al.
patent: 4234833 (1980-11-01), Barrett
patent: 4338553 (1982-07-01), Scott, Jr.
patent: 4383206 (1983-05-01), Matsuoka et al.
patent: 4393342 (1983-07-01), Matsuoka et al.
patent: 4464651 (1984-08-01), Duhame

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