Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1992-09-21
1993-12-07
Pascal, Robert J.
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315 82, 315307, 315224, 307 108, H05B 3702, B60Q 102
Patent
active
052686175
ABSTRACT:
A power-supply apparatus, or ballast, for starting and operating a high-pressure gas discharge lamp is fed from a battery and has at least one current- and/or power-controlled voltage converter which is coupled to a high-pressure gas discharge lamp via an ignition device and to a current/power control device via input and output terminals. A comparator of the current/power control device produces a switching signal dependent upon a lamp voltage input signal, and a capacitor, dependent upon the switching signal, is charged with a circuit having a first time constant and discharged with a circuit having a second time constant. The charge voltage of the capacitor is applied to the output to determine the level and duration of additional power supplied to the high-pressure gas discharge lamp after ignition. When the power-supply apparatus is turned off, the capacitor is coupled to a second reference voltage source and is charged by means of the first time constant. The comparator produces, when the power-supply apparatus is switched on, a switching signal when a lamp voltage limit is exceeded.
REFERENCES:
patent: 4240009 (1980-12-01), Paul
patent: 5036256 (1991-07-01), Garrison et al.
patent: 5103143 (1992-04-01), Daub
Daub Wolfgang
Wendt Friedrich-Karl
Hella KG & Hueck Co.
Kinkead Arnold M.
Pascal Robert J.
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