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Large power LED digital linear light modulation system

A digital linear, LED light source technology, applied in the field of dimming systems, can solve the problems that the influence cannot be eliminated, inconvenience, etc.

Active Publication Date: 2014-02-19
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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  • Large power LED digital linear light modulation system
  • Large power LED digital linear light modulation system
  • Large power LED digital linear light modulation system

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Embodiment Construction

[0015] refer to figure 1 As shown, a high-power LED digital linear dimming system of the present invention includes a filter and protection circuit 3, a PWM control circuit 4, and an output filter circuit 5 sequentially connected between the DC power supply 1 and the LED light source 2, and at the same time , the PWM control circuit 4 circuits are connected with a single-chip microcomputer 6, and the single-chip microcomputer 6 circuits are 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, and the current sampling Amplifying circuit 8 is connected with single-chip microcomputer 6. The single-chip microcomputer 6 described in this embodiment is a microprocessor with more than 4 channels of 12-bit high-speed ADC analog-to-digital converters and a 12-bit DAC digital-to-analog converter; the linear potentiometer 7 is connected to the single-chip microcomputer ...

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Abstract

The invention discloses a large power LED digital linear light modulation system and belongs to the technical field of an LED light modulation system. The large power LED digital linear light modulation system is technically characterized by comprising a filter and protection circuit, a PWM control circuit and an output filter circuit which are sequentially in circuit connection between a DC power source and an LED light source, wherein the PWM control circuit is in circuit connection with a single-chip microcomputer, the single-chip microcomputer is in circuit connection with a linear potentiometer, a current sampling amplification circuit is arranged between the output filter circuit and the LED light source, the current sampling amplification circuit is connected with the single-chip microcomputer, a welding point side edge of the LED light source is provided with a temperature sensor, and the temperature sensor is connected with the single-chip microcomputer through an ADC analog-to-digital converter. The large power LED digital linear light modulation system aims to have properties of compact structure and accurate light modulation and can be used for light modulation of a large power LED.

Description

technical field [0001] The invention relates to a dimming system, more specifically, to a high-power LED digital linear dimming system. 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 of the b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
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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