Circuit arrangement for starting and operating a high-pressure gas discharge lamp
AssigneeU.S. Philips Corporation
InventorsHans G. Ganser, Ralf Schafer, Hans P. Stormberg
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Abstract
A circuit arrangement for starting and operating a high-pressure gas discharge lamp having an outer starting electrode connected to an igniter. A full-wave rectifier (1) is connected to an alternating voltage supply (A, B) and has an output shunted by a series arrangement of a diode (4) and a capacitor (5). The capacitor is discharged in part through the lamp (3) after each half period of the alternating voltage. A resistor (6), which is high-ohmic with respect to a current limiter (2), is connected in the current circuit between the end of the capacitor (5) facing the diode (4) and the lamp (3). Thus, starting of the lamp is facilitated.
Claims9
A circuit arrangement for starting and operating a high-pressure gas discharge lamp having an outer starting electrode comprising, means connecting the discharge lamp in series with a current limiter to a voltage source, a starting-pulse producer which comprises a pulse transformer connected on the secondary side to the starting electrode and on the primary side to a pulse capacitor and to a controlled switching element, characterized in that the voltage source is a full-wave rectifier connected to an alternating voltage supply and having an output shunted by a series arrangement of a diode and a further capacitor which is discharged at least in part through the lamp after each half period of the alternating voltage, a resistor, which is high-ohmic with respect to the current limiter, connected in the current circuit between the end of said capacitor facing the diode and the lamp.
Dependencies are inferred from the claim text.