Efek Perubahan Frekuensi Switching pada LED Driver Topologi Buck

Authors

  • Pasman Rizky Politeknik Caltex Riau
  • Siska Novita Posma Politeknik Caltex Riau
  • Mohammad Yanuar Hariyawan Politeknik Caltex Riau

Abstract

Saat ini, sumber catu daya LED tidak lagi meggunakan regulator linier melainkan regulator switching. Switching pada MOSFET biasanya menggunakan sinyal PWM (Pulse Width Modulation) dengan frekuensi yang konstan. Switching dengan frekuensi konstan tersebut akan menghasilkan harmonisa yang menjadi sumber emisi EMI. Cara yang paling efektif untuk mengurangi emisi EMI yang dihasilkan oleh LED driver adalah menggunakan teknik spread spectrum. Pada proyek akhir ini telah dilakukan pengujian performansi buck LED driver evaluation board LM3409. Pada kondisi normal, buck LED driver evaluation board LM3409 menghasilkan tegangan maksimum 12,01V, arus maksimum 1,02 A dan daya maksimum 12,2502. Sedangkan level EMI conducted belum memenuhi standar CISPR 22 saat bekerja dengan VADJ 0,01 V – 0,4 V. Sedangkan saat bekerja dengan VADJ 0,5 V – 1,22 V sudah memenuhi standar CISPR 22 dengan level EMI dibawah 56 dBµV. Pada saat kondisi diberikan gangguan dengan sinyal kotak, level EMI mejadi berkurang dari -48,5 dBm menjadi -80 dBm.

Author Biographies

Pasman Rizky, Politeknik Caltex Riau

Teknik Elektro Telekomunikasi

Siska Novita Posma, Politeknik Caltex Riau

Teknik Telekomunikasi

Mohammad Yanuar Hariyawan, Politeknik Caltex Riau

Teknik Elektronika Telekomunikasi

References

J. Balcells, A. Santolaria, A. Orlandi, S. Member, D. Gonz, and J. Gago, “EMI Reduction in Switched Power Converters Using Frequency Modulation Techniques,” IEEE Trans. Electromagn. Compat., vol. 47, no. 3, pp. 569–576, 2005.

H. Guo, H. Wu, B. Zhang, and Z. Li, “A novel spread-spectrum clock generator for suppressing conducted EMI in switching power supply,” Microelectronics J., vol. 41, no. 2–3, pp. 93–98, Feb. 2010.

A. Hellany, “Radiated and Conducted EM1 Emissions in Switch Mode Power Supplies (SMPS): sources, causes and predictions.,” pp. 54–61.

O. Trescases, “A Low-Power DC-DC Converter with Digital Spread Spectrum for Reduced EMI,” 37th IEEE Power Electron. Spec. Conf., pp. 1–7.

P. Wang and J. Zhang, “Research and Design of a Common Mode Hybrid EMI Filter For Switch-mode Power Supply,” 2009.

C. Tao, P. Wang, and J. Zhang, “An Efficient Common-Mode Hybrid EMI Filter Used in Switch-mode Power Supply,” 2009 IEEE 6th Int. Power Electron. Motion Control Conf., vol. 3, pp. 951–953, May 2009.

O. Trescases, G. Wei, A. Prodic, and W. T. Ng, “An EMI Reduction Technique for Digitally Controlled SMPS,” IEEE Trans. Power Electron., vol. 22, no. 4, pp. 1560–1565, Jul. 2007.

F. S. Power and S. Smps, “Analysis and Reduction of Common-Mode and Differential-Mode EMI Noise in a,” vol. 7, pp. 1080–1083.

S. P. C. A. Survey, K. Mainali, S. Member, R. Oruganti, and S. Member, “Conducted EMI Mitigation Techniques for Switch Mode Power Converter: A Survey,” vol. 25, no. 9, pp. 2344–2356, 2010.

L. Solankee, “EMI Reduction in Switching Power Converter by Using Chaotic Frequency Modulation Technique,” vol. 5, no. 1, pp. 33–47, 2012.

A. Gosavi, “Application of Spread Spectrum technique for EMI reduction in boost converter - A case study,” pp. 2–5.

Z. Cao and Y. Zhang, “Variable Frequency Modulation for EMI Suppressing in Power Converter,” Energy Power Eng., vol. 05, no. 04, pp. 1147–1152, 2013.

D. González, J. Balcells, A. Santolaria, J. Le Bunetel, J. Gago, and D. Magnon, “Conducted EMI Reduction in Power Converters by Means of Periodic Switching Frequency Modulation,” vol. 22, no. 6, pp. 2271–2281, 2007.

Published

2017-02-23

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Artikel