Detection of the partial and/or total failure of a group of light sources on a vehicle

An electric power supply device for a plurality of light sources which provide a vehicle lighting function of a motor vehicle, comprising:

• a plurality of control circuits each configured to control electric power supplied to at least one respective light source of the plurality of light sources, wherein each control circuit comprises a diagnostic circuit configured to deliver a diagnostic signal for said at least one respective light source;
• and
• a processing circuit configured to process the diagnostic signals delivered by each of the plurality of control circuits, wherein the processing circuit is configured to deliver, as a function of said diagnostic signals, a first detection signal for partial failure of the vehicle lighting function indicating failure of fewer than all of the plurality of light sources supplied by the control circuits, and a second detection signal that is different from the first detection signal for total failure of all of the light sources supplied by each of the control circuits,
• wherein the processing circuit comprises an AND combinational logic circuit that includes a plurality of diodes whose cathodes receive the diagnostic signals from the plurality of control circuits, the AND combinational logic circuit being configured to generate the second detection signal on the basis of the diagnostic signals respectively supplied by the diagnostic circuits of the control circuits,
• wherein the processing circuit comprises an OR combinational logic circuit that includes a second plurality of diodes whose anodes receive the diagnostic signals from the plurality of control circuits, the OR combinational logic circuit being configured to generate the first detection signal on the basis of the diagnostic signals respectively supplied by the diagnostic circuits of the control circuits.

An electric power supply device for a plurality of light sources which provide a vehicle lighting function of a motor vehicle, comprising:

• a plurality of control circuits each configured control electric power supplied to at least one respective light source of the plurality of light sources, wherein each control circuit comprises a diagnostic circuit configured to deliver a diagnostic signal for said at least one respective light source, wherein the diagnostic signal is binary signal having a first level when the light source is operating correctly, and a second level which differs from the first level when the lights source has defective operation;
• and
• a processing circuit configured to process the diagnostic signals delivered by each of the plurality of control circuits, wherein the processing circuit includes a first diode circuit that receives diagnostic signals from the plurality of circuits via anodes thereof and that is configured to deliver, as a function of said diagnostic signals, a first detection signal for partial failure of the vehicle lighting function indicating failure of fewer than all of the plurality of light sources supplied by the control circuits, the processing circuit further including a second diode circuit that receives diagnostic signals from the plurality of circuits via cathodes thereof and that is configured to deliver a second detection signal that is different from the first detection signal for total failure of all of the light sources supplied by each of the control circuits.