LED (Light Emitting Diode) dimming device, system and method

Abstract

The invention provides an LED (Light Emitting Diode) dimming device, a system and a method. The method includes the following steps that: collecting the partial pressure values of a resistance temperature sensor; conducting analog-to-digital conversion to the collected partial pressure values, and averaging the partial pressure values to generate a digital signal AD_Value (analog-to-digital); and calculating the corresponding pulse width modulation value PWM_Value( Pulse-Width Modulation) according to a formula so as to adjust the duty ratio of an outputted pulse width modulation signal. In such a way, precise adjustment to the average current of a loaded LED light is realized, and the brightness of the LED light changes smoothly. The method for automatically, dynamically and precisely adjusting the brightness of the LED light so as to adjust the temperature of the LED light offsets the limitation of the heat dissipation of the hardware of the LED light.

Description

Technical field [0001] The present invention relates to the field of LED lighting, and more specifically, to an LED dimming device, an LED dimming system and an LED dimming method. Background technique [0002] As a brand-new lighting technology, LED lighting has attracted worldwide attention and is known as the third revolution in the history of human lighting. High-brightness LED lights can provide higher brightness with less power consumption, and have the advantages of energy saving, environmental protection, shock resistance, long service life and fast switching on. The LED lamp is a typical current-driven device. Due to its own voltage drop, people pay more and more attention to heat dissipation in the lighting applications of high-power LED lamps. This is because the light decay of the LED or its life is directly related to its junction temperature. If the heat dissipation is not good, the junction temperature will be high and the life will be short. According to the Arrh...

AI Technical Summary

Problems solved by technology

The traditional LED dimming process uses the temperature of the fixed LED lamp as a variable to correspond to the pulse width modulation (PWM) count value. When the temperature of the LED lamp changes to a different preset fixed temperature point, the PWM count The magnitude of the value change will be large, resulting in a relatively obvious step-wise change in the brightness of the LED light

[0004] Therefore, the traditional LED dimming method has the disadvantage that the brightness of the LED lamp cannot be adjusted accurately according to the temperature of the LED lamp, and the process of LED dimming is not stable enough.

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