Light system for a motor vehicle
A light system including a first light source, a second light source, a first drive device configured to supply a first pulse-width modulation current for supplying power to the first light source, the first current including a first peak intensity and a first duty cycle, a second drive device configured to supply a second pulse-width modulation current for supplying power to the second light source with the second current comprising a second peak intensity and a second duty cycle, a control module generating a first control signal and a second control signal for the first control device and the second control device. The first peak intensity being lower than the second peak intensity, and the first duty cycle is higher than the second duty cycle.
1 . A luminous system for an automotive vehicle comprising:
a first light source; a second light source;
a first control unit configured to supply a first pulse-width-modulated (PWM) current to power the first light source, the first PWM current having a first peak intensity and a first duty cycle;
a second control unit configured to supply a second pulse-width-modulated current to power the second light source, the second PWM current having a second peak intensity and a second duty cycle;
a driver for controlling the first control unit and second control unit, wherein a first PWM control signal transmits to the first control unit and supplies the first PWM current; and
wherein a second PWM control signal transmits to the second control unit and supplies the second PWM current;
wherein each PWM control signal allows each associated control unit to supply the first and the second light sources using current defined by the first peak intensity and the second peak intensity;
with the luminous system being configured so that the first peak intensity is greater than the second peak intensity such that the first duty cycle is lower than the second duty cycle.
2 . The luminous system as claimed in claim 1 , wherein the luminous system is configured so that the first PWM current has a first average intensity, and the second PWM current has a second average intensity less than or equal to the first average intensity.
3 . The luminous system as claimed in claim 1 , wherein the luminous system is configured so that the first light source generates a first luminous flux, and the second light source generates a second luminous flux less than or equal to the first luminous flux.
4 . The luminous system of claim 1 , wherein the driver is configured so as to control the first control unit and the second control unit by transmitting a first PWM control signal to the first control unit and a second PWM control signal to the second control unit;
each of the first PWM control signal and second PWM control signal including the driver that defines the first PWM and the second PWM control signals depending on an available margin of correction for each of the first and the second light sources, wherein the available margin of correction is the difference between the value of a respective PWM control signal of an associated light source and a threshold value of the respective PWM control signal.
5 . The luminous system as claimed in claim 1 , further comprising a matrix light source that includes a plurality of elementary light sources divided into at least two sets, with the first light source and the second light source each forming one of the plurality of elementary light sources of the matrix light source and belonging to two different sets.
6 . The luminous system of claim 1 , further including a third light source and a fourth light source, the first light source being arranged between the third and fourth light sources, the first to the fourth light source emitting a gradation of luminous intensities.
7 . A luminous system for automotive vehicle comprising:
a first light source that is a matrix light source composed of a plurality of elementary light sources;
a first control unit of the first light source;
a driver for controlling the first control unit, with the driver being configured so as to selectively transmit:
a first control signal to the first control unit so that it supplies a first pulse-width-modulated (PWM) current, the first PWM current having a first peak intensity and a first duty cycle; and
a second control signal to the first control unit so that it supplies a second pulse-width-modulated (PWM) current, the second PWM current having a second peak intensity and a second duty cycle;
with the luminous system being configured so that the first peak intensity is greater than the second peak intensity, and such that the first duty cycle is lower than the second duty cycle.
8 . The luminous system of claim 7 , wherein the first PWM current has a first average intensity, and the second PWM current has a second average intensity equal to the first average intensity.
9 . The luminous system as claimed in claim 7 , wherein the luminous system is configured so that with the first control signal the first light source generates a first luminous flux, and with the second control signal the first light source generates a second luminous flux equal to the first luminous flux.
10 . The luminous system of claim 7 , wherein the driver is configured to change between the first control signal and the second control signal when the first duty cycle or second duty cycle reaches a threshold value, wherein the threshold value is the maximum value or a predefined value of an associated PWM control signal.
11 . The luminous system of claim 7 , wherein the first light source forms one of the plurality of elementary light sources of the matrix light source.
12 . The luminous system of claim 11 , wherein the driver defines the second control signal depending on an available margin of correction of the first duty cycle of each of the plurality of elementary light sources of the matrix light source;
the available margin of correction being the difference between a threshold value and value of the first duty cycle of each of the plurality of elementary light sources;
wherein the threshold value is a maximum value or a predefined value of an associated PWM control signal; and
wherein the available margin of correction is a difference between the threshold value and a value of the first duty cycle of each of the plurality of elementary light sources.
13 . The luminous system as claimed in claim 7 , wherein the first peak intensity is greater than or equal to twice the second peak intensity; and the second duty cycle is greater than or equal to twice the first duty cycle.
14 . A lighting device for automotive vehicle, comprising:
a luminous system, including:
a first light source; a second light source;
a first control unit configured to supply a first pulse-width-modulated (PWM) current to power the first light source, the first PWM current having a first peak intensity and a first duty cycle;
a second control unit configured to supply a second pulse-width-modulated (PWM) current to power the second light source, the second PWM current having a second peak intensity and a second duty cycle;
a driver for controlling the first control unit and second control unit;
wherein a first PWM control signal transmits to the first control unit and supplies the first PWM current;
wherein a second PWM control signal transmits to the second control unit and supplies the second PWM current;
wherein each PWM control signal allows each associated control unit to supply the first and the second light sources using current defined by the first peak intensity and the second peak intensity:
with the luminous system being configured so that the first peak intensity is greater than the second peak intensity such that the first duty cycle is lower than the second duty cycle; and
a cooling means or a finned heat exchanger that interacts thermally with the first light source.