• Optoelectronic Technology
  • Vol. 40, Issue 1, 57 (2020)
Jianjun CHEN1、2, Lei LI1、2, Hongwei ZHAO1、2, Kaili LIU1、2, and Li ZHAO1、2
Author Affiliations
  • 1The 55th Research Institute of China Electronics Technology Group Corporation,Nanjing 210016,CHN
  • 2National Flat Panel Display Engineering Technology Research Center,Nanjing 210016,CHN
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    DOI: 10.19453/j.cnki.1005-488x.2020.01.011 Cite this Article
    Jianjun CHEN, Lei LI, Hongwei ZHAO, Kaili LIU, Li ZHAO. Research of LED Backlighting Dimming Technology with PDM Control Method[J]. Optoelectronic Technology, 2020, 40(1): 57 Copy Citation Text show less

    Abstract

    A LED backlighting dimming method based on PDM algorithm was proposed in order to solve the defect of PWM dimming method in application.The frequency domain simulation analysis of waveforms showed that the harmonic frequency of PDM method moved to higher region than PWM method, avoiding the test frequency band(25 Hz~10 kHz)of CE101 so that it was easier to pass the EMC CE101 test with PDM method. As a result, compared with PWM method, the current waveforms were relatively gentle and the load characteristics were obviously improved by using PDM method. In summary, PDM method has advantages in electromagnetic environment and load sensitive applications.
    Jianjun CHEN, Lei LI, Hongwei ZHAO, Kaili LIU, Li ZHAO. Research of LED Backlighting Dimming Technology with PDM Control Method[J]. Optoelectronic Technology, 2020, 40(1): 57
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