LED Lighting System with Accurate Current Control

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.

A method for controlling a current in light emitting diodes (LEDs) of an LED lighting system, comprising:

• converting, by a switching power supply, 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;
• controlling, by the LED controller coupled to the switching power supply and the light emitting diodes, a current of the LEDs;
• calculating, by the LED controller, 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
• utilizing, by the LED controller, the actual charge based on the current to modify a future switching timing of the switching power supply.