Patent ID: 8847498
Filing Date: 2014-09-30
Classification: H05B

Abstract:
1. A driver circuit for driving an LED, comprising: a rectifier circuit to receive AC voltage and to convert the AC voltage to DC voltage; a filter circuit for filtering the DC voltage; a detection circuit having an output, the detection circuit for determining a change in the rectified DC voltage over a predetermined time interval; and a dampening circuit comprising a transistor having a base and a damping resistor, the transistor connected in parallel with the dampening resistor and the output of the detection circuit connected to the base of the transistor, the damping circuit for dampening filtered current responsive to the detection circuit determining that the change in rectified DC voltage over the predetermined time interval exceeds a predetermined threshold, the dampening circuit connected in parallel with the filter circuit, and the detection circuit configured to switch the transistor to enable the dampening resistor to dampen the filtered current.