Hybrid ballast for high pressure discharge lamp

Details Hybrid ballast for high pressure discharge lamp Hybrid ballast for high pressure discharge lamp

1995-08-18

1996-12-31

Pascal, Robert

Electric lamp and discharge devices: systems

Plural power supplies

Diverse-type current supplies

315206, 315160, 315209R, 315DIG2, 315DIG7, H05B 3700

Patent

active

055897398

ABSTRACT:
A circuit for operating a discharge lamp includes input terminals for connection to a supply voltage source and a first apparatus coupled to the input terminals for generating a low-frequency alternating current from a supply voltage delivered by the supply voltage source. A second apparatus is coupled to the input terminals for generating from the supply voltage a further current which is superimposed on the low-frequency alternating current. The polarity of the further current is the same as that of the low-frequency alternating current. As a result, instabilities do not arise in the discharge arc of a high-pressure discharge lamp operated by the circuit.

REFERENCES:
patent: 4075476 (1978-02-01), Pitel
patent: 4187448 (1980-02-01), Kuroi et al.
patent: 4484107 (1984-11-01), Kaneda
patent: 4870327 (1989-09-01), Jorgenson
patent: 5270618 (1993-12-01), Nilssen

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