Adaption circuit for operating a high-pressure discharge lamp

Details Adaption circuit for operating a high-pressure discharge lamp Adaption circuit for operating a high-pressure discharge lamp

1986-03-31

1988-03-01

Dixon, Harold

Electric lamp and discharge devices: systems

Regulation of the control current and/or potential applied...

315199, 315200R, 315208, 315224, 315289, 315DIG7, H05B 3702

Patent

active

047288655

ABSTRACT:
An adaptation circuit (3) for operating a high-pressure discharge lamp (1) via a controlled semiconductor switch (4) in series with the lamp. The control circuit for the switch (4) to comprise a voltage division circuit (5,6). The voltage division circuit is connected in parallel with the switch when the lamp is connected to the circuit output terminals (E,F) and one branch of the voltage division circuit comprises a parallel-combination of a capacitor (57) and a resistor (56). Thus, the variation of the voltage across the lamp influences the control of the semiconductor switch so that it is possible to stabilize, for the major part, the power dissipated by the lamp against, variation in the supply voltage and against lamp voltage variations during the life of the lamp.

REFERENCES:
patent: 3361931 (1968-01-01), Vollrath
patent: 3500124 (1970-03-01), Babcock
patent: 3569776 (1971-03-01), Moerkens et al.
patent: 3763396 (1973-10-01), Shilling
patent: 3925705 (1975-12-01), Elms et al.
patent: 4048543 (1977-09-01), Owen et al.
patent: 4163925 (1979-08-01), Gyursanszky
patent: 4459515 (1984-07-01), Smith

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