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| THPMA024 |
Implementation of High Precision Magnet Power Supply using the DSP
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- K.-H. Park, J. Choi, C. W. Chung, S.-H. Jeong, D. E. Kim
PAL, Pohang, Kyungbuk
- B.-K. Kang
POSTECH, Pohang, Kyungbuk
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This paper presents the precision magnet power supply for the Pohang Light Source using the digitally controlled PWM method. The required current to energize the some magnets was 600 A with the high precision of ~10ppm at least to accomplish a high stable beam operation. This power supply has been implemented using a digital signal processor, TMS320F28 series from Texas Instruments, with high speed external 16-bit ADCs. The designed digital controller includes both a current feedback loop and a DC link voltage feed-forward loop, which was applied by the PI control scheme. To reduce the output current ripple, the damped L-C filter was fabricated at both the DC link and load sides. Various experimental results such as stability, bandwidth and harmonic analysis, as well as simulation are given to verify the characteristics of the DSP based magnet power supply.
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