Large-power LED luminous decay compensation integrated circuit

Abstract

The present invention provides a large-power LED luminous decay compensation integrated circuit. A photoelectric detection unit is connected with a current extraction unit, and the current extraction unit is provided with a bias voltage terminal; a time sequence generation unit is connected with a current extraction integration unit, a voltage sampling unit and a reference voltage selection unit, and the time sequence generation unit is provided with a clock signal terminal and a reset signal terminal; a current extraction integration unit is connected with the voltage sampling unit, and the voltage sampling unit is earthed through an external capacitor; the voltage sampling unit and the reference voltage selection unit are connected with a voltage comparison unit, and the reference voltage selection unit is provided with two bias voltage terminals; and the voltage comparison unit is connected with a waveform shaping unit, the waveform shaping unit is connected with a reference selection unit, and the reference selection unit is provided with a reset signal terminal, an output terminal and two reference voltage terminals. The large-power LED luminous decay compensation integrated circuit effectively improves the illumination intensity attenuation of a large-power LED after usage for a long time and prolongs the actual service life to realize the intelligence and microminiaturization of LED illumination driving.

Description

technical field [0001] The invention relates to the realization of a light attenuation compensation integrated circuit. As a part of the LED drive chip, it is an expansion and optimization of the LED drive circuit, which can effectively improve the phenomenon of attenuation of the illumination intensity of high-power LEDs after long-term use, and prolong the actual service life of the LEDs. , Realize the intelligence and miniaturization of LED lighting drive. Background technique [0002] High-power LEDs are widely used in modern lighting technology due to their low power consumption, long life, small size, and low price. However, there is a serious light decay phenomenon in high-power LEDs, and its luminous performance will decay with the passage of time and the increase of temperature. When the light intensity decays to a certain extent, although the LED can still work, it no longer meets the needs of lighting. , Limiting the actual service life of LEDs and increasing lig...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiency that the existing LED driver chips cannot realize automatic light attenuation compensation, the present invention provides an integrated circuit that can effectively improve the attenuation of illumination intensity of high-power LEDs after long-term use and prolong the actual service life of LEDs, which can be used as an LED driver Part of the chip, realizing the intelligence and miniaturization of LED lighting drivers

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