Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Impedance or current regulator in the supply circuit
Patent
1998-11-30
1999-10-19
Wong, Don
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Impedance or current regulator in the supply circuit
315307, 315308, G05F 100
Patent
active
059694823
ABSTRACT:
A circuit arrangement for supplying a controlled substantially constant level of electrical power to a discharge lamp in a load circuit includes a feedback loop responsive to a comparison or difference between a power measure signal corresponding to electrical power consumed by the lamp and a reference signal corresponding to a desired consumed power. The power measure signal is formed by a power measure signal forming circuit which includes a one quadrant multiplier which receives at a pair of inputs respective lamp voltage and lamp current measure signals output from a sample and hold device arranged for sampling both a signal indicative of instantaneous lamp voltage and a signal indicative of instantaneous lamp current. The sampling is done at instants at which a signal which is indicative of the derivative of the lamp voltage passes through zero in a predetermined direction. The latter signal constitutes the current through a capacitor which is coupled at one end to a voltage that is indicative of the instantaneous lamp voltage and at the other end to a voltage clamp.
REFERENCES:
patent: 5103142 (1992-04-01), Daub
patent: 5103143 (1992-04-01), Daub
patent: 5523656 (1996-06-01), Luuresma
patent: 5578908 (1996-11-01), Persson
patent: 5734232 (1998-03-01), Hendrix et al.
patent: 5739643 (1998-04-01), Usui
Lee Wilson
Philips Electronics North America Corporation
Slobod Jack D.
Wong Don
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