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Accurate LED (light-emitting diode) dimming device and method on basis of PWM (Pulse Width Modulation)

A dimming device and LED driving technology, applied in the LED field, can solve the problems of small dimming range, poor accuracy, and color shift, and achieve the effects of short response time, avoiding voltage instability, and improving reliability.

Inactive Publication Date: 2012-04-25
中国船舶重工集团公司第七〇七研究所
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art, provide a precise LED dimming device and method based on PWM, and solve the problems of color shift during dimming, small dimming range and poor accuracy

Method used

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  • Accurate LED (light-emitting diode) dimming device and method on basis of PWM (Pulse Width Modulation)
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  • Accurate LED (light-emitting diode) dimming device and method on basis of PWM (Pulse Width Modulation)

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Embodiment Construction

[0025] Embodiments of the present invention are described in further detail below in conjunction with the accompanying drawings:

[0026] A precise LED dimming device based on PWM, such as figure 1 As shown, it includes a power supply module, a signal processing unit, an LED drive unit and a key processing unit. connection, the input end of the LED driving unit is connected with the PWM signal output end of the signal processing unit, and the output end of the LED driving unit is connected with the LED. The signal processing unit identifies the key command of the key processing unit and identifies the key command. The single-chip microcomputer generates a PWM (pulse width modulation) signal of corresponding frequency and duty cycle according to the key command and outputs it to the LED drive unit. The LED drive unit Make a corresponding response to control the current to achieve the purpose of adjusting the LED. Each part is described below:

[0027] The button processing u...

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Abstract

The invention relates to an accurate LED (light-emitting diode) dimming device and an accurate LED dimming method on the basis of PWM (Pulse Width Modulation). The device comprises a power supply module, a signal processing unit, an LED driving unit and a key processing unit. The key processing unit is connected with an input end of the signal processing unit. An input end of the LED driving unit is connected with a PWM signal output end of the signal processing unit. An output end of the LED driving unit is connected with an LED. The method comprises the following steps that: (1) the brightness is regulated by the key processing unit; (2) the signal processing unit identifies a brightness regulation control signal, generates a PWM signal with the corresponding duty ratio and outputs the PWM signal to the LED driving unit; and (3) the LED driving unit sends a driving signal to the LED according to the PWM signal and controls and regulates the luminous flux of an LED unit. The invention solves the problems of color migration generation in the dimming process, small dimming range and poor accuracy. Meanwhile, the accurate LED dimming device and the accurate LED dimming method have the characteristics of short reaction time, high efficiency, high reliability and safety and the like.

Description

technical field [0001] The invention belongs to the field of LEDs, in particular to a PWM-based precise LED dimming device and method. Background technique [0002] Currently, LEDs are used in more and more applications, from flashlights to street lights, to stadium scoreboards and computer monitors, all requiring precisely controlled LED output. Luminous flux is a measure of the useful work emitted by a light source, and this performance indicator is a weighted function of the energy of all wavelengths and the visible light region that corresponds specifically to the human eye. The luminous flux of the LED is proportional to the size of the driving current. In many cases, the real-time change of the light output must be realized by changing the driving current of the LED. At present, the widely used LED dimming method is an analog dimming method, which is realized by adjusting the nominal LED current. Theoretically speaking, the nominal current of the LED can be adjusted ...

Claims

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Application Information

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IPC IPC(8): H05B37/02
CPCY02B20/42Y02B20/40
Inventor 赵娜周喆赵子阳傅金琳
Owner 中国船舶重工集团公司第七〇七研究所
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