Discharge lamp current controlling circuit

Details Discharge lamp current controlling circuit Discharge lamp current controlling circuit

1994-07-19

1996-01-02

Pascal, Robert J.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315307, 315291, 315224, 315128, G05F 100

Patent

active

054811635

ABSTRACT:
A discharge-lamp lighting device stably lights and controls a discharge lamp suitable for use in a vehicle. In the discharge-lamp lighting device, an inverter for receiving DC power from a DC step-up circuit supplies AC power to the discharge lamp. Further, a start-discharging circuit applies a high voltage for effecting start discharging to the discharge lamp. A lamp current controlling circuit decides the value of a current to be supplied to the discharge lamp, based on both the luminous efficiency of the discharge lamp, which varies depending on a voltage applied to the discharge lamp and a voltage for the discharge lamp, which has been detected by a voltage detector circuit. A step-up controlling circuit controls a voltage output from the DC step-up circuit in such a manner that the decided value of current coincides with the value of a current to be supplied to the discharge lamp, which has been detected by a current detector circuit.

REFERENCES:
patent: 5140229 (1992-08-01), Yagi et al.
patent: 5142203 (1992-08-01), Oda et al.
patent: 5187413 (1993-02-01), Araki et al.
patent: 5204587 (1993-04-01), Mortimer et al.
patent: 5233273 (1993-08-01), Waki et al.
patent: 5256940 (1993-10-01), Wada et al.
patent: 5365152 (1994-11-01), Ozawa et al.
Vedilis "Eureka Project 273" Field Test Specifications (no date needed, see paper #10 for a related statement).
Vedilis "Eureka Project 273" Vehicle Discharge Light System (no date needed, see paper #10 for a related statement).

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