LED color temperature compensation method and circuit, color modulation chip and LED system

Abstract

The invention provides an LED color temperature compensation method and circuit, a color modulation chip and an LED system. The conduction ratio of each path of LED in an LED system can be adjusted through the input of one path of original dimming signal, in other words, each path of LED can perform color temperature adjustment under the control of the compensated dimming signal to achieve the required target color temperature of the LED system, that is, the color temperature actually achieved by the LED system is the required target color temperature, so that the problem of inherent color temperature imbalance between the color temperature actually achieved by the LED system and the target color temperature is solved. The upper computer does not need to modify the original dimming signal,so that the software of the upper computer used for generating the original dimming signal can be kept uniform, and the problem that the upper computer needs to have multiple software versions simultaneously after the upper computer software is modified without permission is avoided.

Description

technical field [0001] The invention relates to the technical field of LED lighting, in particular to an LED color temperature compensation method, a circuit, a color-matching chip and an LED system. Background technique [0002] With the development of LED intelligent lighting, the brightness, color temperature, and color of LEDs can be controlled in various wireless or wired ways, and the control becomes increasingly convenient. At present, the dimming and color adjustment of LEDs is usually realized by PWM pulse width modulation, that is, the brightness and color temperature can be adjusted by adjusting the duty cycle of the PWM signal. Specifically, please refer to figure 1 , in the currently commonly used two-way complementary LED coloring system application, the host computer is used to provide a high-frequency (for example, 2KHz) PWM signal (recorded as PWM_IN) to simultaneously control LED1 and LED2 to emit light alternately, for example, in the PWM_IN signal In on...

AI Technical Summary

Problems solved by technology

Obviously, when the color temperature of the LED system needs to be adjusted every time, the upper computer needs to modify the PWM signal output by it, which will cause the problem that there are multiple software versions in the upper computer at the same time, and it will be difficult to modify the upper computer software without permission. The problem of not being able to make the LED system reach the target color temperature

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