Vehicle discharge lamp lighting circuit with current-limiting DC

Electric lamp and discharge devices: systems – Special application – Vehicle

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315224, 307 108, H05B 3702

Patent

active

059006978

ABSTRACT:
A vehicle discharge lamp lighting circuit which prevents a current larger than the maximum allowable current IL.sub.max from flowing in the discharge lamp even if the battery voltage V.sub.BATT is higher than the lowest bulb voltage Vz of the discharge lamp. In the vehicle-discharge lamp lighting circuit, Z>(V.sub.BATT -Vz)/IL.sub.max is established, where Z is the DC impedance in the lighting circuit, except for the discharge lamp 7, as viewed from the DC power source 1, V.sub.BATT is the battery voltage which is set to 24V, Vz is the lowest lamp voltage of the discharge lamp 7 which is set to 20V, and IL.sub.max is the maximum allowable current which is set to 2.6 A. In this case, Z=(24V-20V)/2.6 A.apprxeq.1.54 .OMEGA. or higher, e.g., 1.6 .OMEGA.. Hence, in the case where V.sub.BATT =24V, Vz=20V, and IL.sub.max =2.6 A, the DC impedance Z in the lighting circuit, except for the discharge lamp, as viewed from the DC power source is set to 1.54 .OMEGA. or higher (Z=(24V-20V)/2.6 A.apprxeq.1.54 .OMEGA.).

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Gottlieb, "Regulated Power Supplies," 4th ed., McGraw-Hill, pp. 282-287, 1992.

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