Operating circuit for a discharge lamp

Details Operating circuit for a discharge lamp Operating circuit for a discharge lamp

1991-12-17

1993-03-30

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315291, H03B 4136

Patent

active

051987287

ABSTRACT:
A switched mode power supply (SNT) is coupled to a source of d-c energy (U.sub.Batt) and provides electrical energy to a lamp within widely varying limits. The switching conditions of the switched mode power supply are controlled by an operation control circuit (ADD) which has a current sensing resistor, serially connected to the lamp, to provide a lamp current signal, and a voltage divider (R2, R3) connected across the lamp to sense lamp voltage and provide a lamp voltage signal. The lamp current signal and the lamp voltage signal are added, compared in a comparator formed by an operational amplifier (IC2-A), with respect to a reference setting power level, and the output signal from the comparator is coupled back to the switched mode power supply to control the switching rate thereof, based on the instantaneous lamp current and lamp voltage. Excess voltage can be compensated by providing either an active semiconductor switching network (T1, T2, FIG. 3) or a passive semiconductor switch (ZD), which affects the added current-voltage signal applied to the comparator (IC2-A).

REFERENCES:
patent: 3999100 (1976-12-01), Dendy
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patent: 4952849 (1990-08-01), Fellow
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patent: 4958108 (1990-09-01), Jorgensen
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patent: 5068572 (1991-11-01), Blankers
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"The Art of Electronics" by P. Horowitz and W. Hill, Cambridge University ess, Cambridge, 1980.
Journal of the Illuminating Engineering Society, vol. 17, No. 2, Summer 1988.
"Switched-Mode Power Supplied (SMPS)" by Siemens Aktiengesellschaft Bereich Bauelemente.

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