Efficient discharge lamp electrode heating circuit operable over

Details Efficient discharge lamp electrode heating circuit operable over Efficient discharge lamp electrode heating circuit operable over

1996-10-18

1998-11-24

Kinkead, Arnold

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch in the primary circuit of the supply...

315225, 315100, 315107, 315214, H05B 3702

Patent

active

058412409

ABSTRACT:
A circuit arrangement for operating a discharge lamp comprising input terminals for connection to a supply voltage source. A load branch B has terminals for holding the discharge lamp and includes an inductive ballast. A device I is coupled to ends of the load branch and to the input terminals to generate a high-frequency voltage from the supply voltage furnished by the supply voltage source. A device II is coupled to the device I to adjust the power consumed by the discharge lamp, the frequency of the high-frequency voltage being dependent upon the adjusted value of the power consumption. A transformer having a primary winding and secondary windings with each secondary winding shunted by an electrode branch during lamp operation, which electrode branch includes an electrode of the discharge lamp. The primary winding forms part of a branch C which also includes a frequency-dependent impedance and which shunts the load branch. Thus, a desired relationship exists between the heating currents through the electrodes and the discharge current over a wide range of power consumed by the discharge lamp.

REFERENCES:
patent: 5027033 (1991-06-01), Zuchtriegel
patent: 5406174 (1995-04-01), Slegers
patent: 5619105 (1997-04-01), Holmquest

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