Full-digital proportion integration differentiation (PID) controlled light-emitting diode (LED) light source driver

Abstract

The invention discloses a full-digital proportion integration differentiation (PID) controlled light-emitting diode (LED) light source driver, comprising a control processing unit, a user interface unit, an LED driving unit, an LED light source and a power supply management unit, wherein the control processing unit comprises a central processing unit (CPU) processing system, a PID control system, a pulse-width modulation (PWM) system and a feedback information quantification system which are integrated in a single chip microcomputer; and an output end of the LED driving unit is connected with the feedback information quantification system of the control processing unit through a feedback sampling unit. In the practical application, compared with traditional light source driving scheme which is set up through an analogue integrated circuit, the full-digital PID controlled LED light source diver disclosed by the invention is greatly improved in stability, service life, economical efficiency, and convenience and effectiveness of size or control. In addition, the full-digital PID controlled LED light source diver conveniently performs quantification management, is easy to develop and strong in applicability, and has strong market competitiveness.

Description

technical field [0001] The invention relates to an LED light source driving scheme, in particular to an all-digital PID control LED light source driver. Background technique [0002] Traditional LED light source driving schemes are all constructed by analog integrated circuits. However, with the development of science and technology and the change of people's needs, many defects have been exposed. First of all, the control method of the traditional LED light source driving scheme is simple, and the LED working characteristics require a stable working current. However, due to the unstable mains voltage, the life and reliability of the LED light source driver are greatly reduced, and the output current often varies with the supply voltage. The change will produce large fluctuations, which will cause flickering when the LED is working, which indirectly affects the service life of the LED light source; secondly, some high-power LEDs require high-quality, dedicated circuit driver...

AI Technical Summary

Problems solved by technology

First of all, the control method of the traditional LED light source driving scheme is simple, and the LED working characteristics require a stable working current. However, due to the unstable mains voltage, the life and reliability of the LED light source driver are greatly reduced, and the output current often varies with the supply voltage. The change will produce large fluctuations, which will cause flickering when the LED is working, which indirectly affects the service life of the LED light source; secondly, some high-power LEDs require high-quality, dedicated circuit drivers. These analog integrated circuits are not only complicated in manufacturing process, but also The production cost is high, and the drive circuit is large in size, which is not conducive to mass production; finally, the analog circuit is not convenient for control and quantitative management, and it is difficult to meet the needs of diversified applications in today's market

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