1. School of Electronics and Information Engineering Tianjin Polytechnic University Tianjin 300387 China 2. Key Laboratory of Advanced Electrical Engineering and Energy Technology Tianjin Polytechnic University Tianjin 300387 China 3. Engineering Research Center of High Power Solid State Lighting Application System Ministry Education Tianjin 300387 China
Abstract：Light-emitting diodes (LEDs) are a kind of Electroluminescent Devices, characteristics parameters have a close relationship with the current. This paper mainly talks about in the two kinds of current power supply, continuous current supply and PWM pulse current supply, the effects of current on characteristics parameters of white LEDs, such as luminous flux, spectra, domain wavelength, peak wavelength, correlation color temperature and color coordinate. Through experimental test and data analysis, some conclusions was obtained that for continuous current supply, the injection current has the greatest impact on LED the luminous flux and correlation color temperature, almost linear relationship, and has a little effects on spectra, domain wavelength, color coordinate and peak wavelength. For PWM pulsed current supply, the change trend of all characteristic parameters are similar to continuous current supply, but better and more stable than continuous current supply. The results can guide the choice of current power supply mode to use and help towards the application of LED in domestic light.
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2013, Vol. 28 
