Vehicle discharge lamp lighting circuit with current-limiting DC impedance
Abstract
Abstract A vehicle discharge lamp lighting circuit which prevents a current larger than the maximum allowable current IL max from flowing in the discharge lamp even if the battery voltage V BATT is higher than the lowest bulb voltage Vz of the discharge lamp. In the vehicle-discharge lamp lighting circuit, Z>(V BATT -Vz)/IL 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 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 max is the maximum allowable current which is set to 2.6 A. In this case, Z=(24V-20V)/2.6 A≈1.54 Ω or higher, e.g., 1.6 Ω. Hence, in the case where V BATT =24V, Vz=20V, and IL 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 Ω or higher (Z=(24V-20V)/2.6 A≈1.54 Ω).
Inventors
- 👤 Atsushi Toda
Bibliographic Details
Claims Analysis
Total Claims: 5References Cited (Backward Citations)
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