LED Driving Power Online Detection System

Lei Youjian(Jiangmen Polytechnic)
Lin Xiaomin(Jiangmen Polytechnic)

Abstract

LED driving power is a necessary product for LED lighting; the behaviors of pursuing low-cost of some small and medium-sized enterprise producers in China directly affect the quality of LED power. Therefore, it is necessary to detect the reliability of the LED driving power. There are 4 main factors for the over-burning of the LED driving power: lightning oscillation frequency, voltage mutation frequency, switch motion frequency and static discharge frequency.

For the above problems, this paper raises the LED driving power online detection system, including: surge voltage input module, main control module, pulse width modulation module, power module, thyristor control module, current transformer, amplifier, RMS-DC conversion module, A/D conversion module, display module, main control module connecting to surge voltage input module.

The main operating principle is that the main control module connects the pulse width modulation module, which connects the thyristor control pole of the thyristor control module, the first anode thereof connects the power module; the primary side of current transformer connects the second anode of the thyristor control module through two wire switches, and the secondary side thereof connects the amplifier, which connects the RMS-DC conversion module; RMS-DC conversion module connects the A/D conversion module, which connects the main control module; the main control module also connects the display module. In addition, the project also provides the detection functions of LED output current, voltage digital display and different loads.

Keywords

Rotary encoder; Current transformer; Output current locus curve; RMS-DC conversion module

References

Ranmiao Lou, Guangfei Li. DSP Curriculum Design Gui–deon High Speed Digital Signal Processor[M]. Beijing: Beijing University Press, July 2007. (in Chinese)

Yanli Deng. Technical Problem Research on LED DrivingPower Test and Certification[M]. Hangzhou Dianzi Univer-sity Press, May 2011. (in Chinese)

Huanping Li. Research and Design on LED Driving Pow-er[M]. South China University of Technology Press, May 2010. (in Chinese)

DOI: http://dx.doi.org/10.26549/met.v1i1.320