LED UNIT FOR COOPERATION WITH A MAINS DIMMER

摘要

An LED lamp unit (100) comprises: a unit input (101, 102) capable of receiving dimmed mains voltage (PCACV) from a supplying mains dimmer (1); a lamp driver (32) having input terminals (33, 34) coupled to the unit input to receive the dimmed mains voltage and capable of converting the received dimmed mains voltage to a dimmed LED current; at least one LED (31) coupled to output terminals (35, 36) of the lamp driver (32); and a bleeder circuit (200) coupled to the unit input for drawing a bleeder current (½) from the received mains voltage. The bleeder circuit (200) is an adaptive bleeder circuit comprising an intelligent control circuit (300), capable of determining a condition of the supplying mains dimmer. The control circuit (300) adaptively optimizes the bleeder current in relation to the condition of the supplying mains dimmer.