Load control device for a light-emitting diode light source

摘要

A load control device for controlling the intensity of a light source (e.g., a light-emitting diode light source) reduces visible flickering in the light source when a target intensity of the light source is dynamically changing. The load control device includes a load regulation circuit operable to conduct a load current through the electrical load and to control the amount of power delivered to the electrical load. The load control device also includes a controller for adjusting the average magnitude of the load current to a target current. The controller pulse-width modulates the magnitude of the load current between a first current less than the target current and a second current greater than the target current. When the target current is dynamically changing, the controller is operable to adjust to the average magnitude of the load current towards the sum of the target current and a supplemental signal.

主权项

1. A load control device for controlling the amount of power delivered to an electrical load, the load control device comprising:
a load regulation circuit operable to conduct a load current through the electrical load and to control the amount of power delivered to the electrical load; and a controller coupled to the load regulation circuit; wherein, when a target current of the load current is in a steady state, the controller is operable to pulse-width modulate the magnitude of the load current between a current less than the target current and a current greater than the target current to adjust an average magnitude of the load current to the target current; and wherein, when the target current is dynamically changing, the controller is operable to pulse-width modulate the magnitude of the load current between a sum of a supplemental signal and a current less than the target current and a sum of the supplemental signal and a current greater than the target current to adjust the average magnitude of the load current to the sum of the target current and the supplemental signal.