Patent ID: 8154212

Claim:
A circuit for supplying a light source with Pulse Width Modulation (PWM) dimming capability, the circuit comprising: a rectifier for receiving an input bipolar PWM modulated signal representative of a desired dimming level for said light source and produce therefrom a rectified signal, the input bipolar PWM modulated signal being a signal that alternates between first and second voltages of opposite signs, the first voltage defining an on time and the second voltage defining an off time; a current regulator arranged to receive said rectified signal and produce therefrom a supply current for said light source such that the light source is driven only during the on-time; a control module sensitive to said input bipolar PWM modulated signal to control said current regulator to produce a PWM modulated supply current for said light source; and a capacitor arranged between said rectifier and said current regulator to stabilize said rectified signal.