Centralized-control type LED (Light Emitting Diode) headlamp set dimming system

Abstract

The invention provides a centralized-control type LED headlamp set dimming system, wherein a management computer sends out a dimming instruction to a drive board on an LED headlamp set through a main control board; on the drive board, a drive MCU (Micro Controller Unit) sends the dimming instruction to a pulse width modulation and detection module after receiving the dimming instruction, the pulse width modulation and detection module converts the dimming instruction into a PWM (Pulse Width Modulation) signal, and controls a duty ratio of the opening time of an electronic switch on an LED drive module to generate a PWM drive signal on the basis of the PWM signal, and the PWM drive signal is sent to a luminescent plate. According to the centralized-control type LED headlamp set dimming system, a special constant current source module is replaced by the system, the precise control over the LED brightness is realized, single lamp brightness adjustment is realized conveniently, the design and production costs of an LED lighting system product and the use cost of users can be lowered significantly. The centralized-control type LED headlamp set dimming system has the functions of high light energy utilization, energy conservation, emission reduction and the like, can be applied to an optical guide device, and can also be generalized to other fields of intelligent control of large LED lighting systems and the like.

Description

technical field [0001] The invention relates to the technical field of photoelectric control, in particular to a centralized control type LED (Light Emitting Diode, light emitting diode) lamp group dimming system. Background technique [0002] In existing optical guidance devices, tungsten-halogen lamps are often used as light sources. Although the luminous intensity is high, since the light emitted by the halogen-tungsten lamps is incandescent light, and the optical guidance devices need to use monochromatic light, this requires additional filtering. The light is filtered by the light sheet, and then coupled into the transmission fiber bundle to emit light from the light-emitting surface; in the design of the entire light-emitting system, more than 90% of the energy is consumed in the form of heat and light in other bands; due to the power of the halogen tungsten lamp large, high energy consumption, and at the same time ensure its luminous intensity, so the service life is ...

AI Technical Summary

Problems solved by technology

[0002] In existing optical guidance devices, tungsten-halogen lamps are often used as light sources. Although the luminous intensity is high, since the light emitted by the halogen-tungsten lamps is incandescent light, and the optical guidance devices need to use monochromatic light, this requires additional filtering. The light is filtered by the light sheet, and then coupled into the transmission fiber bundle to emit light from the light-emitting surface; in the design of the entire light-emitting system, more than 90% of the energy is consumed in the form of heat and light in other bands; due to the power of the halogen tungsten lamp large, high energy consumption, and at the same time ensure its luminous intensity, so the service life is short and the maintenance cost is high; in addition, when the tungsten halogen lamp is used as the light source, the diameter is usually greater than 100mm, and a larger lens system needs to be designed to couple the light into the Transmission optical fiber, and the tungsten-halogen lamp has poor parallelism, which is not conducive to beam shaping

Therefore, it is difficult to balance the two aspects of light energy efficiency and filter bandwidth design by using a tungsten-halogen lamp plus a filter.

[0003] At present, LED light-emitting technology is more and more widely used. LED has the advantages of good monochromaticity and high photoelectric conversion efficiency. High places are generally driven by a special constant current source, resulting in complex design and high manufacturing costs.

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