Electronic assembly for an automotive luminuos device and automotive luminous device
The invention presents an electronic assembly for an automotive luminous device ( 10 ) comprising a light source ( 1 ), a driver ( 3 ) to control the light source ( 1 ) and an input protection circuit ( 2 ). The input protection circuit ( 2 ) is arranged between the power supply and the light source ( 1 ) and comprises a protection input ( 21 ) and a protection output ( 22 ). The protection input ( 21 ) and the protection output ( 22 ) are connected by the interposition of a resistor group comprising a resistor ( 23 ) and a diode ( 24 ) connected in series. A node between the protection input ( 21 ) and the resistor group is connected to the ground through a first capacitor ( 25 ) and a node between the resistor group and the protection output ( 22 ) is connected to the ground through a second capacitor ( 26 ).
1 . An electronic assembly for an automotive luminous device, the electronic assembly comprising
a light source
a driver configured to control the operation of the light source, the driver including a driver power input and a driver control input, wherein the light source is electrically connected to the driver control input;
a power supply configured to provide electric supply to the light source and to the driver; and
an input protection circuit arranged between the power supply and the light source, the input protection circuit being intended to limit the transient voltage and/or current received by the light source and/or by the driver and includes a protection input and a protection output
wherein
the protection input and the protection output are connected by the interposition of a resistor group including a resistor and a diode connected in series, the diode having an anode terminal and a cathode terminal,
the diode's anode terminal is connected to the protection input directly or through the resistor,
a node between the protection input and the resistor group is connected to the ground through a first capacitor and
a node between the resistor group and the protection output is connected to the ground through a second capacitor.
2 . The electronic assembly according to claim 1 , wherein the input protection circuit is also located between the power supply and the driver power input.
3 . The electronic assembly according to claim 1 , wherein the first capacitor has a capacitor value higher than 47 nF.
4 . The electronic assembly according to claim 1 , wherein the second capacitor has a capacitor value equal or higher than 2.2 μF.
5 . The electronic assembly according to claim 1 , wherein the resistor has a resistor value comprised between 10 and 40Ω.
6 . The electronic assembly according to claim 1 , wherein the driver is a DC/DC driver.
7 . The electronic assembly according to claim 1 , wherein the driver is a linear driver.
8 . The electronic assembly according to claim 1 , wherein the light source is a solid-state light source.
9 . The electronic assembly according to claim 1 , wherein the light source includes at least one RGB LED.
10 . The electronic assembly according to claim 1 , wherein the resistor is located closer to the protection output than the diode.
11 . Automotive luminous device comprising
an electronic assembly including
a light source
a driver configured to control the operation of the light source, the driver including a driver power input and a driver control input, wherein the light source is electrically connected to the driver control input;
a power supply configured to provide electric supply to the light source and to the driver; and
an input protection circuit arranged between the power supply and the light source, the input protection circuit being intended to limit the transient voltage and/or current received by the light source and/or by the driver and includes a protection input and a protection output
wherein
the protection input and the protection output are connected by the interposition of a resistor group including a resistor and a diode connected in series, the diode having an anode terminal and a cathode terminal,
the diode's anode terminal is connected to the protection input directly or through the resistor,
a node between the protection input and the resistor group is connected to the ground through a first capacitor and
a node between the resistor group and the protection output is connected to the ground through a second capacitor; and
an optical element arranged to project the light emitted by the light source.