Patent ID: 9469360
Filing Date: 2016-10-18
CPC Classification: B60Q,B62J,H05B

Claim Text:
1. A control circuit for a LED external lighting unit of a vehicle, said lighting unit comprising at least a LED source and a passive heatsink, wherein the control circuit comprises: a temperature sensor adapted to provide a first output signal carrying information about the operating temperature of at least one of the LED source and the passive heatsink; a first output node operatively connectable to at least one of an optical and acoustic warning device and adapted to provide thereto a first control signal depending upon the first output signal, adapted for generating an alarm warning through said warning device when said temperature is higher than a first threshold value; a driver unit of the LED source comprising a first input node adapted to receive a second control signal, depending upon the speed of the vehicle and the first output signal, the driver unit being adapted to output a LED source driving signal, said driving signal being a relatively high-power driving signal or a relatively low-power driving signal according to the second control signal, wherein the high-power driving signal is a direct current driving signal and wherein the low-power driving signal is a Pulse Width Modulated signal (PWM signal).