Bleeder circuit controller

摘要

A bleeder circuit controller (11) configured to control a bipolar junction transistor (10) having a collector (12) configured to be connected to an output of a phase cut dimmer (2) for receiving a bleed current, an emitter (13) for connecting to ground and a base (14), the bleeder circuit controller configured to generate a control signal for controlling the bleed current through the bipolar junction transistor (10) and measure a signal indicative of the current flow through the dimmer (2) and apply a current limit to a base-emitter current flow as a function of the measured signal.

主权项

1. A bleeder circuit controller configured to control a bipolar junction transistor having a collector configured to be connected to a rectified output of a phase cut dimmer to receive a bleed current, an emitter for connecting to ground, and a base, the bleeder circuit controller being configured to generate a control signal to control the bleed current through the bipolar junction transistor, to measure a signal indicative of the current flow through the dimmer, and to apply a current limit to a base-emitter current flow as a function of the measured signal,
wherein the function comprises a first region in which the base-emitter current limit increases with the measured signal between a first threshold and a second threshold.