A large-scale LED array dimming control method and dimming control system
A technology of LED array and dimming control, which is applied in the direction of light source, electric light source, lighting device, etc. It can solve the problem that multiple LEDs cannot be precisely dimmed and dimmed, and achieve the effect of high-precision control
Inactive Publication Date: 2018-04-27
CHINA UNIV OF GEOSCIENCES (WUHAN)
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[0004] The purpose of the present invention is to overcome the shortcomings of the prior art that it is impossible to perform precise dimming on multiple LEDs independently and the dimming effect is poor, and to provide a method that can perform independent precise dimming on each LED in a large-scale LED array and Method and system for feedback control
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[0024] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments, and the content of the present invention is not limited to the following embodiments.
[0025] The large-scale LED array dimming control method provided by the present invention comprises the following steps:
[0026] (1) Set the constant driving current amplitude of each LED, and convert the constant driving current amplitude of each LED into a PWM pulse voltage signal whose duty cycle is proportional to the constant driving current amplitude;
[0027] (2) The PWM pulse voltage signal is shaped into a rectangular pulse waveform by a pulse shaping circuit, and then the shaped PWM pulse voltage signal is converted into a DC voltage signal through a second-order RC low-pass filter, and the DC voltage signal passes through the V composed of an op amp and a transistor. The / I conversion circuit converts the set constant drive current to drive the LED to emi...
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The invention provides a large-scale LED array dimming control method, which independently controls the driving current of each LED on the large-scale LED array through current negative feedback, and changes the luminous power of each LED by adjusting the driving current; the invention also corresponds to A large-scale LED array dimming control system is provided, at least including a host computer and an LED driver module, a host computer communication module, a master microcontroller and more than two slave microcontrollers are arranged between the host computer and the LED driver module, The upper computer, the upper computer communication module, the main microcontroller and the slave microcontroller are electrically connected in sequence; the LED driver module has the same number of LEDs in the large-scale LED array, and its two ends are respectively connected to the output terminals of the LED and the slave microcontroller , an LED current detection module is connected between the LED and the input terminal of the slave microcontroller; the invention can perform independent precision dimming and negative feedback control on each LED in a large-scale LED array.
Description
technical field [0001] The invention relates to an LED driving power supply technology, in particular to a large-scale LED array dimming control method and control system. Background technique [0002] Light-emitting diode (LED), as a new type of solid-state display and lighting source, has been widely used in large-scale LED dot matrix display screens and various lighting fields. In addition, the spectrum emitted by monochromatic LEDs is a narrow-band spectrum and products with different peak wavelengths are very abundant. Therefore, using the principle of superposition of spectra, monochromatic LEDs with different peak wavelengths form an LED array, and adjust the driving current of each LED to change its luminescence. Power, in theory, any required relative spectral power distribution can be obtained within the coverage range of LED light-emitting wavelengths, that is, artificial light sources with arbitrary adjustable spectra can be produced. [0003] At present, for ul...
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IPC IPC(8): H05B37/02
Inventor 张晶晶刘晓海张典方健康俊峰张星宋姗
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)