Electric lamp and discharge devices: systems – With automatic shunt and/or cutout
Patent
1995-02-10
1996-06-04
Gonzalez, Frank
Electric lamp and discharge devices: systems
With automatic shunt and/or cutout
315127, H05B 3700
Patent
active
055236537
ABSTRACT:
A low voltage lighting fixture connected to an isolation step-down transformer is protected from limited or maximum short circuit conditions by monitoring the secondary current of the step-down transformer until a fault is detected, whereupon the protection circuitry deenergizes the primary of the transformer by opening a relay. The protection circuitry is completely isolated such that a breakdown in voltage from the primary to secondary of the stepdown transformer, which would place 120 volts on the secondary side, cannot occur. Additionally, while monitoring the high current-low voltage secondary of the transformer, the relay is placed in the primary circuitry which is at line voltage, but at a much lower current rating. The relay is a normally open device which closes when either of a pair of redundant optoisolators conduct current.
REFERENCES:
patent: 2309711 (1943-02-01), Pearson
patent: 5241242 (1993-08-01), Daub
patent: 5363018 (1994-11-01), Shackle
Gonzalez Frank
Ratliff Reginald A.
Tivoli Industries, Inc.
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