Optimization Measures for Increased Immunity against High Frequency Disturbances and Reduced Emission in the Range of 2 kHz to 150 kHz Realized on Different LED Lamps Thomas Wohlfahrt, Christian Waniek and Johanna M.A. Myrzik   2017/04/25

Abstrac

In this paper, optimization measures to increase the immunity against high frequency (HF) disturbances by simultaneously reducing the impact on the grid through non sinusoidal input currents in the frequency range of 2 kHz to 150 kHz are presented. Two different light-emitting diode (LED) lamps as an example for typical electronic mass-market products are optimized. Currently, LED lamps are state of the art in the range of efficient lamps. But long-term experiences concerning their immunity against HF disturbances are not investigated so far. In order to assess the additional stress on the built-in components of the LED lamps caused by HF disturbances, the power supplies of two exemplary LED lamps are considered and their input current, the current of the electrolytic capacitor and the current of the LED are depicted. Based on these measurements, the electrolytic capacitor can be identified as one mainly weak point of the LED lamp’s power supply. Subsequently, possible measures to increase the immunity of the identified stressed components and the LED lamp by itself are presented. Finally, the overall efficiency of the optimizations and their effect on the grid’s power quality are shown.

Authors and affiliations

Thomas Wohlfahrt, Christian Waniek and Johanna M.A. Myrzik
Institute of Energy Systems, Energy Efficiency and Energy Economics. TU Dortmund University. Dortmund (Germany)

Key word

Lifetime estimation, immunity enhancement, emission reduction, high frequency disturbances, LED lamps.

References

[1] C. Unger, “Frequencies above the harmonic range - Challenge of the future?”, in Proc. 2010 IEEE International Power and Energy Conference (IPEC), pp. 763-766.
[2] M. Klatt, A. Koch, J. Meyer, P. Schegner, J. Myrzik, C. Körner, T. Darda, and G. Eberl, "Emission levels above 2kHz - Laboratory results and survey measurements in public low voltage grids", 22nd International Conference on Electricity Distribution (CIRED), Stockholm, Sweden, 2013.
[3] L. Han, and N. Narendran, “An accelerated test method for predicting the useful life of an LED driver”, IEEE Transaction on Power Electronics, vol. 26, no. 8, pp. 2249-2257, 2011.
[4] S. Wang, X. Ruan, K. Yao, and Z. Ye, “A flicker-free electrolytic capacitor-less AC-DC LED driver”, IEEE Energy Conversion Congress and Exposition (ECCE), Phoenix, USA, 2011.