Light color adjustment method, device, dimming drive circuit and lighting system

Abstract

The invention provides a light color adjustment method, device, dimming drive circuit and lighting system, wherein the method includes: determining the reference bright color parameter of the light source to be adjusted according to the reference output current value of the light source to be adjusted; determining the light source to be adjusted The target bright color parameter; according to the reference output current value, reference bright color parameter and target bright color parameter, calculate the actual output current value of the light source to be adjusted, and determine the actual bright color parameter of the light source to be adjusted; calculate the difference between the actual bright color parameter and the target bright color parameter If the difference of any specific parameter is greater than the preset difference, iteratively adjust the actual output current value of the light source to be adjusted until the difference of each specific parameter between the actual bright color parameter and the target bright color parameter is less than the preset difference value. In the embodiment of the present invention, the calculated actual output current value is iteratively adjusted, so that the light source to be adjusted will not suddenly reach the expected color and / or brightness, thereby effectively avoiding the flickering phenomenon.

Description

technical field [0001] The invention relates to the technical field of lighting, in particular to a method and device for adjusting light color, a dimming drive circuit and a lighting system. Background technique [0002] At present, LED, as an important lighting device, is widely used in different lighting fields. As people's requirements for light color accuracy and light quality (such as strobe, etc.) are getting higher and higher, the feature of LED's dimmable color adjustment has become a basic requirement of LED lighting products. [0003] In the face of these demands, there are currently two types of dimming methods in the industry, one of which is PWM (Pulse Width Modulation, pulse width modulation) dimming (frequency modulation method), for example, see figure 1 with figure 2 ,use figure 2 The pulse signal shown in the control figure 1 The switch state of the circuit shown, the advantage of this dimming method is that the color control is more accurate, and th...

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Problems solved by technology

[0003] In the face of these demands, there are currently two types of dimming methods in the industry, one of which is PWM (Pulse Width Modulation, pulse width modulation) dimming (frequency modulation method), for example, see figure 1 and figure 2 ,use figure 2 The pulse signal shown in the control figure 1 The switch state of the circuit shown, the advantage of this dimming method is that the color control is more accurate, and the color algorithm is relatively simple, but the disadvantage is that it is prone to stroboscopic phenomenon when the brightness is low or the duty cycle of a certain light source is small

Another way is current dimming (i.e. amplitude modulation method). The advantage of this dimming method is that the basic circuit can use traditional circuits. The disadvantage is that the color control is not accurate. The main reason is that the reference voltage accuracy is not high enough, and the color algorithm is relatively Simple

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