Electric lamp and discharge devices: systems – Current and/or voltage regulation
Patent
1979-06-22
1983-02-01
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Current and/or voltage regulation
315158, 315205, 315208, 315307, 315DIG4, H05B 41392
Patent
active
043718124
ABSTRACT:
A light regulation system is provided wherein the light output of a fluorescent lamp(s) is regulated in accordance with the RMS value of the lamp arc current which is automatically adjusted to maintain a referenced ambient light level or arc current. The ballast and associated lamps of the system receive the full line voltage until the lamps are ignited and thereafter the current thereto is automatically limited by limiting the amplitude of the ballast current during the part of each AC voltage half wave that the lamps are ignited. Control between the minimum light level, wherein a minimum arc current flows during each half cycle, to the maximum light level is accomplished by permitting the minimum arc current which flows during the "lamps on" period of each half wave to increase to maximum arc current over a part or all of the period of each half wave that the lamps are on. The light output is thus controlled over a control range using dissipative means to limit the current to the minimum "on" level and then using on-off phase angle switching techniques to provide control from a minimum "on" to full "on" lamp condition.
REFERENCES:
patent: 3614527 (1971-10-01), Wirtz
patent: 4190795 (1980-02-01), Schultheis
Controlled Environment Systems Inc.
LaRoche Eugene R.
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