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Digital linear dimming method for high-power LED

A digital linear, high-power technology, applied in the field of dimming, which can solve problems such as the influence that cannot be eliminated and the inconvenience

Active Publication Date: 2013-12-18
广西奥顺仪器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This adjustment method is relatively simple and the technology is mature, but the nonlinear relationship between brightness and current, and the influence of LED junction temperature on brightness output cannot be eliminated, resulting in a nonlinear change in the brightness of the LED lamp when the potentiometer is adjusted. Inconvenience to some specific use occasions

Method used

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  • Digital linear dimming method for high-power LED
  • Digital linear dimming method for high-power LED
  • Digital linear dimming method for high-power LED

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Embodiment Construction

[0015] refer to figure 1 As shown, it is a schematic diagram of the circuit structure for implementing the high-power LED digital linear dimming method of the present invention, including a filter and protection circuit 3, a PWM control circuit 4 and an output filter circuit connected in sequence between the DC power supply 1 and the LED light source 2 5. At the same time, the PWM control circuit 4 is connected with a single-chip microcomputer 6, and the single-chip microcomputer 6 is connected with a linear potentiometer 7; the circuit between the output filter circuit 5 and the LED light source 2 is provided with a current sampling amplifier circuit 8, so The current sampling amplifying circuit 8 is connected with the single-chip microcomputer 6. The single-chip microcomputer 6 described in the present embodiment is a microprocessor with 12 high-speed ADC analog-to-digital converters and 12 DAC digital-to-analog converters above 4 roads; connect. At the same time, a temper...

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Abstract

The invention discloses a digital linear dimming method for a high-power LED and belongs to the technical field of dimming methods. The digital linear dimming method for the high-power LED is characterized by comprising the following steps that firstly, a single-chip microcomputer receives a potentiometer signal, a current signal, a voltage signal and an LED temperature signal and conducts analog-to-digital conversion; secondly, based on the current signal, the voltage signal and the temperature signal, a luminance compensation coefficient A is calculated; thirdly, a lumen value L is calculated, and an output luminance value Lch which is generated after temperature compensation is calculated according to the luminance compensation coefficient A; fourthly, the current Io which needs to be supplied is obtained according to the Lch; fifthly, whether a sampled current signal is equal to the Io or not is judged, if yes, a result is output to a PWM control circuit, and if not, the result is adjusted and then output to the PWM control circuit. The digital linear dimming method for the high-power LED is convenient to operate, accurate in dimming, and suitable for dimming of the high-power LED.

Description

technical field [0001] The present invention relates to a dimming method, more specifically, to a high-power LED digital linear dimming method. Background technique [0002] The output brightness of the LED lamp is not only related to the material process of the LED lamp itself, but also related to the working current and the junction temperature of the LED lamp. For LED lamps of the same manufacturer and series, the main factors affecting the output brightness are the working current of the LED lamp and the junction temperature of the LED lamp. The greater the LED operating current, the higher the output brightness, but the change of brightness and current is nonlinear. At the same time, the higher the junction temperature, the lower the LED output brightness. When the heat dissipation condition is constant, adjusting the working current of the LED will cause the junction temperature of the LED to change, which is also one of the factors that affect the non-linear change ...

Claims

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Application Information

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IPC IPC(8): H05B37/02
CPCY02B20/40
Inventor 郭钦平黎阳成蒋远刚李志荣陈俭张钱行封荣凯
Owner 广西奥顺仪器有限公司
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