A dimmable color led control system based on nonlinear closed loop

Abstract

The invention discloses a non-linear closed-loop-based dimmable color LED control system, which belongs to the technical field of LED lighting. The control system is composed of microprocessor, LED drive controller, cold and warm white LED strings, light / color sensor, illuminance sensor, power module and corresponding control algorithm. The light / color sensor and illuminance sensor measure the two-color LED light string and the ambient light signal, and control the LED drive controller to drive the LED light string to produce accurate dimmable color output after calculation by the control algorithm in the microprocessor. The purpose of the present invention is to realize the light color control of the LED lighting system to meet the diversified and higher lighting requirements. The modulation accuracy is higher, and the utilization efficiency of electric energy is also greatly improved.

Description

technical field [0001] The invention patent relates to the field of LED lighting technology, especially a non-linear closed-loop based dimmable color LED control system. Background technique [0002] High-power light-emitting diodes (LEDs) have high luminous efficiency, low energy consumption, more environmental protection and longer working life, and have the characteristics of easy modulation. In recent years, the market penetration rate of LED lighting has been increasing, and the market prospect is broad. It has become the next-generation lighting source to replace traditional fluorescent lamps and incandescent lamps. At present, one of the main problems faced by LED lighting is the need for the consistency of light intensity and correlated color temperature (CCT). When used in areas such as hotels, museums, studios, and operating rooms, LED lighting systems are required. Light color remains stable. Due to aging and instantaneously changing operating conditions, even t...

AI Technical Summary

Problems solved by technology

However, all the above-mentioned technologies and products are based on simple linear control methods, adopting the assumption that the color temperature of the cool and warm white LEDs is constant, and directly giving the pulse width modulation (PWM) signal of the cool and warm dual-color LED lights to control the light output and Correlated color temperature does not take into account the nonlinear factors between multiple parameters that actually affect the LED luminous characteristics

For example, changes in the input power of LED lights will lead to changes in light intensity and junction temperature, which in turn will lead to shifts in color temperature

So traditional two-color LED lights cannot provide precise light intensity adjustment and CCT control

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