| 主权项 |
1. A light (30) for motor vehicles and similar provided with a lighting device (31) comprising:
two power supply lines (42,43) in which a primary supplying current (I1) flows; at least two lighting branches (34), which are connected in parallel to one another and to said power supply lines (42,43), each comprising one or more light sources (37) in which a secondary supplying current (I2i) flows; and electronic control means (33), which are configured to make said light sources (37) simultaneously transit from a pre-lighting state, in which a predetermined minimum secondary current (I2Mi) flows in the light sources (37) of each lighting branch (34), to a complete lighting state, in which a nominal secondary current (I2Ni) higher than said predetermined minimum secondary current (I2Mi) flows in the light sources (37) of each said lighting branch (34); said light (30) being characterized in that said electronic control means (33) are further configured to: determine the secondary current (I2i) flowing in each said lighting branch (34); limit said primary supplying current (I1) to a predetermined minimum value (I1M), when the secondary current (I2i) flowing in at least one of said lighting branches (34) is lower than a predetermined current threshold (Si); controlling control the simultaneous transition of said light sources (37) from said pre-lighting state to said complete lighting state, when each of the secondary currents (I2i) flowing in said lighting branches (34) is either higher than or equal to said predetermined current threshold (Si); wherein said two lighting branches (34) are connected to said lighting lines (42,43) by means of first (35) and second (36) common nodes placed at first (VA) and second (VR) predetermined voltages; said electronic control means (33) comprising: main switch means (44) connected between either said first (35) or second (36) common node and one of said power supply lines (42,43); current limiting means (45), which are connected in parallel to said first switch means (44) and are able to limit the primary supplying current (I1) to said predetermined minimum value (I1M); and electronic driving means (40), which are configured to open said main switch means (44) when the secondary current (I2i) flowing in at least one of said lighting branches (34) is lower than said predetermined current threshold (Si) or, vice versa, to close said main switch means (44) to make said light sources (34) simultaneously transit from said pre-lighting state to said lighting state when each of the secondary currents (I2i) flowing in said lighting branches (34) is higher than or equal to said predetermined current threshold (Si). |
