Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Periodic switch cut-out
Patent
1982-08-25
1984-07-24
Laroche, Eugene R.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Periodic switch cut-out
315119, 315DIG7, 328 7, 363 56, H05B 4129
Patent
active
044619804
ABSTRACT:
For protection against potentially serious electric shock hazard to a person removing and/or replacing a fluorescent lamp in a fluorescent lighting fixture having an inverter-type electronic ballast, a special protection circuit is provided as part of this ballast.
This protection circuit operates to disable the ballast inverter within about one second after a fluorescent lamp is removed from at least one of its sockets, thereby removing the potentially hazardous voltage present at the fixture's lamp sockets.
REFERENCES:
patent: 3889153 (1975-06-01), Pierce
patent: 4392087 (1983-07-01), Zansky
patent: 4398126 (1983-08-01), Zuchtriegel
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