Supply circuit for discharge lamps comprising voltage multipliers

1. Discharge tubes direct current feed device made up of at least two voltage multiplier stages, of which the first is composed of two legs for the respective half-waves. Each leg is made up of a first diode (1, 2) and a first condenser (7, 8) and connected in central circuit between input terminals (B1, B2) of the device that has the common point of first diodes (1, 2) and first condensers (7, 8) on the output terminal from which voltage comes out duplicated. The second multiplier stage is composed of two other legs, each one made up of a second diode (3, 4) and a second condenser (10, 9) connected in series between the input terminal (B1) on first diode's (1, 2) side and the output terminal (B5, B6) of the first multiplier, and fitted out of output terminals (B'3, B'4) at the common point of the second diodes (3, 4) and the second condensers (10, 9), from which voltage comes out multiplied. Characterized by an appreciably higher capacitance of the stage's condensers (7, 8) which maintain the tube's discharge current while the low capacitance condensers of output stage (9, 10 or 11, 12) produce only the tube's firing current. Dispositif d'alimentation des tubes à décharge à deux impédances de sorties mises en série par un multiplicateur de tension, il comprend des diodes 1-2-3-4-5-6 (voir Fig. 1) et les capacités de courant de décharge 7-8, les capacités d'amorçage 9-10-11-12, et les résistances 14-13 qui sont nettement plus faible que les capacités 7-8.