Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Discharge control discharge device load
Patent
1984-05-18
1987-05-19
Moore, David K.
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
Discharge control discharge device load
315225, 315307, H05B 4116
Patent
active
046671315
ABSTRACT:
In a series-resonant-loaded inverter-type electronic ballast for two rapid-start fluorescent lamps, in order to meet requirements for safety from electric shock hazard, as well as to protect the inverter circuit from over-load, means are provided by which the proper connection to the ballast of the fluorescent lamps is sensed by way of detecting the proper flow of lamp cathode heating currents. Then, after the circuit is initially turned on and if one of the lamp cathodes were to draw substantially less current than normally called for, the inverter circuit is shut down immediately. On the other hand, if each lamp cathode draws the expected amount of cathode heating current, the inverter circuit is not shut down immediately, but is allowed to operate for a time at least long enough to permit proper starting of the rapid-start fluorescent lamps. However, if the lamps do not start within about one second, the inverter circuit is shut down so as to prevent circuit-damaging overload; which is apt to result when a series-resonant-loaded inverter-type ballast is inadequately loaded. As an overall result, the ballast provides for overload protection as well as for electric shock protection for a person working with inserting and/or removing rapid-start fluorescent lamps from a lighting fixture having such a ballast.
REFERENCES:
patent: 4370600 (1983-01-01), Zansky
patent: 4382212 (1983-05-01), Bay
patent: 4398126 (1983-08-01), Zuchtriegel
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