| Title |
A Study on High Precision and High Stability Digital Magnet Power Supply Using Second Order Delta-Sigma modulation |
| Authors |
Kum-Su Kim ; Kil-Jin Jang ; Dong-Hee Kim |
| DOI |
http://dx.doi.org/10.5207/JIEIE.2015.29.3.069 |
| Keywords |
Magnetic Power Supply ; Delta-Sigma Modulation ; Simulink ; PID Control |
| Abstract |
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, modulation is used and bit contracted DPWM is constituted. And before implementing, to maximize efficiency, simulink is used. |