LED lighting system with accurate current control

摘要

A light emitting diode (LED) lighting system and method are disclosed. The LED lighting system and method include an LED controller to accurately control a current in an LED system. The LED controller includes components to calculate, based on the current and an active time period of an LED current time period, an actual charge amount delivered to the LED system wherein the LED current time period is duty cycle modulated at a rate of greater than fifty (50) Hz and to utilize the actual charge amount to modify and provide a desired target charge amount to be delivered during a future active time period of the LED current time period. The LED system and method further involve components to compare the actual charge amount to a desired charge amount for the active time period and compensate for a difference between the actual charge amount and the desired charge amount during the future active time period.

主权项

1. A light emitting diode (LED) lighting system comprising:
a switching power supply for converting a phase modulated signal generated from a dimmer into an output voltage, wherein the dimmer is a phase cut dimmer and operates at a repetitive phase cut rate; an LED controller coupled to the switching power supply; and light emitting diodes (LEDs) coupled to the LED controller; and wherein the LED controller controls a current of the LEDs and includes components to: calculate, based on the current of the switching power supply, an average current amount delivered to the LEDs in a time period, wherein the time period is based on the repetitive phase cut rate; and utilize an actual charge based on the current to modify a future switching timing of the switching power supply.