A Study on High Precision and High Stability Digital Magnet Power Supply Using Second Order Delta-Sigma modulation

2차 델타 시그마 변조기법을 이용한 고 정밀 및 고 안정 디지털 전자석 전원 장치에 관한 연구

  • Received : 2014.12.10
  • Accepted : 2015.02.02
  • Published : 2015.03.31


This paper is writing about developing magnet power supply. It is very important for power supply to obtain output current in high precision and high stability. As a switching noise and a power noise are the cause of disrupting the stability of output current, to remove these at the front end, low pass filter with 300Hz cutoff frequency is designed and placed. And also to minimize switching noise of the current into magnet and to stop abrupt fluctuations, output filter should be designed, when doing this, we design it by considering load has high value inductance. As power supply demands the stability of less than 5ppm, high precision 24bit(300nV/bit) analog digital converter is needed. As resolving power of 24bit(300nV/bit) analog digital converter is high, it is also very important to design the input stage of analog digital converter. To remove input noise, 4th order low pass filter is composed. Due to the limitation of clock, to minimize quantization error between 15bit DPWM and output of ADC having 24bit resolving power, ${\Sigma}-{\Delta}$ modulation is used and bit contracted DPWM is constituted. And before implementing, to maximize efficiency, simulink is used.


Magnetic Power Supply;Delta-Sigma Modulation;Simulink;PID Control


  1. Drazen Jurisic외 1인, "Low-Noise Active-RC Low-, High-, and Band-pass Allpole Filters Using Impedance Tapering", Proceedings of MEleCon 2000, Lemesos, Cyprus,(May 29-31, 2000.), pp. 591-594.
  2. Franco, S. Design with operational amplifiers and analog integrated circuits, Book, McGraw-Hill edition, 1997.
  3. B. Patella, "Implementation of a High Frequency, Low Power Dgital Pulse Width Modulation Controller Chip," M.S. Thesis, University of Colorado at Boulder, 2000.
  4. San-Ho Byun, et al., "For ${\Sigma}-{\Delta}$ A/D Converter Digital Decimation Filter Design", 2007.
  5. Majd Ghazi Y. Batarseh, "Digital Pulse Width Modulator Techniques for DC-DC Converters", 2010.
  6. Joey White et al., "Noise Shaping in MASH Delta-Sigma Converters", 2009.
  7. G.I. Bourdopoulus, A. Pnevmatikakis, V. Anastassopoulos and T.L.Deliyannis, "Delta-Sigma Modulators: Modeling, Design and Applications,"Imperial College press, 2003.
  8. Saman S. Abeysekera and Charayaphan Charoensak, "Efficient Realization of Sigma-Delta Kalman Lowpass Filter in Hardware Using FPGA", Hindawi Publishing Corporation, 2006.
  9. R. D. Middlebrook, "Input Filter Considerations in Design and Application of Switching Regulators," IEEE Industry Applications Society Annual Meeting, 1976 Record, pp. 366-382.
  10. Raymond B. Ridley, "Secondary LC Filter Analysis and Design Techniques for Current-Mode-Controlled Converters", Ieee Transaction on power electronics, Vol. 3, No. 4, October 1988.
  11. M. Emmenegger, et al., "A Fully Digital PWM for Highest Precision Power Supplies", European Power Electronics Conference, 2001.
  12. Ki-Hyun Park, et al., "Developing High Precision Magnet Power Supply", Journal of Korea Electrical Academic Conference, 2011. 7.
  13. Felix Jenni, et al., "A Novel Control Concept for Highest Precision Accelerator Power Supplies".
  14. Byung Kwon Park, "SMPS Input FIlter Design", EMC Technical Center Newsletter.
  15. Thomas Kugelstadt, "Op Amps for Everyone", Texas Instrument.
  16. Ui Chul Rho, "Performance Analysis of 4.2MW (600VDC, 7kADC) Direct Current Pulse Power Supply", The Journal of the Korean Institute of Illuminating And Electrical Installation Engineers, The Tenth Volume, The Sixth Chapter, 1996.12, pp.73-80.
  17. Kye-Ho Hwang, et al., "A Study on LCC Type High Frequency Resonance DC/DC Converter Applying Non-Contact Power Supply", The Journal of the Korean Institute of Illuminating And Electrical Installation Engineers, The Twenty First Volume, The Sixth Chapter, 2007.7, pp.55-64.
  18. Suk-Jin Hong, et al., "Neutral Point Voltage Control of Three-Level NPC Inverter using DPWM", The Journal of the Korean Institute of Illuminating And Electrical Installation Engineers, Autumn Academic Conference, 2014.11, p.96.