Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1988-07-05
1990-08-28
Laroche, Eugene R.
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315308, 315DIG7, 315277, 315244, H05B 4136, H05B 3702, G05F 100
Patent
active
049528483
ABSTRACT:
A ballast control apparatus for an electric discharge lamp comprises a first series circuit including a first winding of an AC supply voltage transformer, a first winding of a ballast transformer, a lamp current sensing resistor and the lamp. A current sensing transformer has a first winding parallel to the resistor. A second winding of the supply voltage transformer, the ballast transformer and the current sensing transformer are connected in a second series circuit. A signal voltage proportional to lamp power is derived by adding together the voltages induced in the three series-connected second windings. A second signal voltage proportional to lamp voltage is derived across the series combination of the second windings of the ballast transformer and the supply voltage transformer. The voltage induced in the second winding of the current sensing transformer is proportional to lamp current. A signal voltage indicative of the condition of the lamp load can be derived across the second winding of the ballast transformer. These three signal voltages are used to control a DC/AC inverter that energizes the lamp via the supply voltage transformer.
REFERENCES:
patent: 4724360 (1988-02-01), Luursema
Franzblau Bernard
LaRoche Eugene R.
Neyzari Ali
North American Philips Corporation
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