Lighting Device and Automotive Light Comprising Said Lighting Device

摘要

A lighting device of an automotive light comprising light sources supplied by a drive current and a control device comprising a control stage generating a control signal on the basis of the difference between the drive current and a predetermined reference current, and a driving stage, which adjust the drive current on the basis of the control signal. The driving stage comprises a voltage stabilizing device, which supplies, in a first operation condition, a stabilized voltage on an intermediate node thereof, a first transistor having a control terminal receiving the control signal; and a second transistor having a control terminal connected to the intermediate node to be set, in the first operation condition, to the predetermined stabilized voltage), a first terminal connected to the light source, and a second terminal connected to a second terminal of the first transistor.

主权项

1. A vehicle lighting device (4) comprising:
at least one light source (5) designed to be powered by a drive current (I) so as to generate light; and an electronic control device (6) (50) (60) configured to control the drive current (I) supplied to said light source (5);said electronic control device (6) comprising:
control means (9) configured to provide said drive current (I) to said light source (5), and to generate a control signal (CS) based on the difference between a quantity indicative of said drive current (I) and a predetermined reference electrical quantity (Iref); light source driving means (7) configured to regulate said drive current (I) passing through said light source (5) based on said control signal (CS);said vehicle lighting device (4) being characterized in that said light source driving means (7) comprise:
voltage stabilizing means, which have one (41) or more intermediate nodes (41) (55) and are designed to provide in said intermediate nodes (41) (55), in a first operating condition, predetermined stabilized voltages (Vz2) (Vz3); first transistor means (36) having a control terminal connected to said control means (9) to receive therefrom said control signal (CS), and a first terminal connected to a reference line held at a constant reference voltage; second transistor means (37) having one or more control terminals connected to respective intermediate nodes (41) (55) of said voltage stabilizing means to be held, in said first operation condition, to said predetermined stabilized voltages (Vz2) (Vz3), a first terminal connected to said light source (5), and a second terminal connected to a second terminal of said first transistor means (36).