Discharge lamp circuit which limits ignition voltage across a se

Details Discharge lamp circuit which limits ignition voltage across a se Discharge lamp circuit which limits ignition voltage across a se

1996-09-25

2000-02-22

Shingleton, Michael B

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch cut-out

315DIG7, 315324, 315294, 315307, H05B 3702

Patent

active

060284005

ABSTRACT:
A circuit arrangement for igniting and operating at least two discharge lamps. the circuit is provided with input terminals (K1,K2) for connection to a supply voltage source and a circuit I (SC, S1, S2) coupled to the input terminals for generating a high-frequency voltage from a supply voltage delivered by the supply voltage source. A load branch B is coupled to the circuit I and comprising a first branch A including first terminals (K3,K3') for accommodating a discharge lamp and a first inductive element L1, and a second branch C shunting the first branch A and comprising further terminals (K4,K4') for accommodating a discharge lamp and a second inductive element L2 which is magnetically coupled to the first inductive element L1. A circuit II limits the voltage across branch A and branch C to a first value during the ignition of the discharge lamps. A circuit III limits the voltage across branch A and branch C to a second value after the ignition of one of the discharge lamps thereby preventing the occurrence of ignition voltages of very high amplitude across the discharge lamp igniting last.

REFERENCES:
patent: 4370600 (1983-01-01), Zansky
patent: 4392087 (1983-07-01), Zansky
patent: 4441054 (1984-04-01), Bay
patent: 4585974 (1986-04-01), Stupp et al.
patent: 4949015 (1990-08-01), Nilssen

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