Highway crossing guard mechanism controller

Details Highway crossing guard mechanism controller Highway crossing guard mechanism controller

1997-01-30

1998-05-05

Ro, Bentsu

Electricity: motive power systems

Plural diverse motor controls

Motor-reversing

318286, 318380, 318468, 246125, B61L 2908

Patent

active

057479542

ABSTRACT:
A highway crossing gate control circuit is provided which minimizes the "pumping" oscillation of a highway crossing gate arm which is driven up by a permanent magnet motor. A preferred embodiment of the control circuit utilizes a p-channel MOSFET in a power down module of the control circuit to restrict power from being applied to the motor when the gate arm is in an up position and is intended to be held in the up position by a hold clear device which acts as a mechanical break. Provision is included for dynamic braking on the gate arm moving downward after an initial drive down mode.

REFERENCES:
patent: 3601603 (1971-08-01), Hughson
patent: 3877174 (1975-04-01), McDonald
patent: 3964704 (1976-06-01), Karr
patent: 4369943 (1983-01-01), Hussein
patent: 4855653 (1989-08-01), Lemirande
patent: 5092544 (1992-03-01), Petit et al.
patent: 5098044 (1992-03-01), Petit et al.
patent: 5502367 (1996-03-01), Jones
patent: 5543596 (1996-08-01), Jones et al.
Data sheet from Microsemi Corp., Scottsdale, AZ, for transient absorption zener device, series 1N6267 thru 1N6303A and 1.5KE6.8 thru 1.5KE400A, pp. 4-15 and 4-16.

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