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Control of Digital Power Supplies

Learn about the revolutionary digital power supplies at the PSI, addressing stability, flexibility, and reproducibility. Explore the hardware, software, and management systems in detail. Discover why digital power supplies are the future.

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Control of Digital Power Supplies

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  1. Control of Digital Power Supplies Andreas Lüdeke Swiss Light Source / PSI 20 May 2003 EPICS Collaboration Meeting

  2. PSI Digital Power Supplies Master Fast Optical Link (5 MHz) DSP Controller ADC/DAC Card Optical Trigger 0..6 Slaves PWM Signal I DIO U1..4 DCCT Magnet Power Converter

  3. Why use Digital Power Supplies? • Single source of drifts: ADC voltage reference • All PS at the SLS proved to have excellent stability • Flexibility of the power supplies • Regulation loop can be adapted to load • Easy to add new power supply features on DSP • Good reproducibility, reliability • PWM is digital, modern DCCT will be digital • Why not?

  4. Hardware Overview • Parallel fast access • (10k frames per sec) • IOC  IP • DSP  IP • … Power Supply Controller VME Trans.Mod. T.Mod Orbit DSP IP IP IP IP Linux PC Consoles IOC Carrier EVR Timing

  5. Power Supply Hardware • DSP Controller Card • Euro card size • Shark DSP • Shark links on backplane • ADC/DAC card • 2 ADC, 16 Bit, 50 kHz • 4 ADC, 12 Bit • 2 DAC for debugging

  6. Fast and precise ADC UADC [V] 10 µV 1 ppm 20th Bit Umax 4.7895 4.7894 - 10 µV + 20 µV 4.7893 1 kHz Filter 600 µV 4.7892 - 10 µV - 40 µV 4.7891 4.789 Umin 4.7889 4.7888 0 200 400 600 800 1000 1200 1400 1600 1800 2000 33 min t [s]

  7. VME Hardware • Industry Pack Carrier • VME64x 4 slot boards • “off-the-shelf”: • Greenspring • Vipc664 • Hytec 8002 Industry Pack Module for 2 power supplies VME64x Transition module for 8 power supplies

  8. DSP Software • Local intelligence: • 50 kHz pulse width modulation loop • Sophisticated alarms, like change in load resistance • Triggered current waveform (DSP ramp) • Scaleable, arbitrary waveform • 16000 times 80 µsec steps  > 1 second waveform • The same DSP program for all PS • Locally stored parameter settings for each PS

  9. EPICS device/driver • Carrier board independent by use of drvIpac • Read and write 256 power supply registers • DSP waveform and program downloads • Softramps: synchronised current waveforms • Arbitrary clock rate (<1kHz) for 8000 setpoints • Synchronised by timing system • Diagnostic records • Statistics of optical fibre link and IP failures

  10. EPICS database • One template for 500 power supplies • Each power supply supports • Download and save of DSP programs, parameter sets, DSP ID • current waveform: download, scaling, offset, length, … • reading max. and min. current from PS • reading actual magnet resistance from controller • ... • Magnet cycling configurable for each PS • Detailed fault diagnostic for PS, link and driver

  11. Software Management • DSP software is documented by Excel sheets • Script transforms sheets into a C include file • Easy upgrade of the driver for new PS functions • Identical DSP and EPICS software for all PS • Configuration by parameter set

  12. Outlook • PSI type digital PS are “en vogue” • Each manufacturer can get a PSI licence • Diamond will use exclusively digital PS for magnets • Soleil is evaluating the PSI digital PS • Industry Pack module can be used on CPCI • Driver source can be reused for Tango • Customized DSP programs • For specific application • To drive several PS with one DSP card

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