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DC-DC Conversion Studies –
Status Report from Aachen
Tracker Upgrade Power WG Meeting
February 13th, 2009
Lutz Feld, Rüdiger Jussen, Waclaw Karpinski,
Katja Klein, Jennifer Merz, Jan Sammet
1. Physikalisches Institut B, RWTH Aachen University
Personal
Katja Klein 2Status Report from Aachen
• Lutz Feld: team leader
• Waclaw Karpinski: electronics engineer
– plus electronics workshop team
• Katja Klein: Helmholtz Alliance fellow (4-years from April 08)
• Jan Sammet: PhD student
• Two diploma students:
– Rüdiger Jussen (DC-DC converter studies)
– Jennifer Merz (Analysis of the material budget)
Funding
Katja Klein 3Status Report from Aachen
• We have joined the SLHC-PP project of the EU FP-7 program
(Work Package 8: Tracking detector power distribution)
• In Germany, next 3-year BMBF funding period starts in July 2009
Have applied for invest money and positions
First feedback in May
Work Plan from Mid 2008
Katja Klein 4Status Report from Aachen
• Investigation of system aspects of novel powering schemes
– DC-DC conversion
– Serial powering?
• Noise susceptibility measurements
– Noise injection into silicon strip modules
– Noise injection into DC-DC converters
• Contribute to the development & characterization of magnetic field
tolerant and radiation hard DC-DC buck converters, in coll. with CERN
PH-ESE group
– Duplicate CERN test-stand for converter noise characterization
– PCB development
– Magnetic field test
– Irradiation tests
• Simulation of material budget of different powering schemes
Work Plan from Mid 2008
Katja Klein 5Status Report from Aachen
• Investigation of system aspects of novel powering schemes
– DC-DC conversion
– Serial powering?
• Noise susceptibility measurements
– Noise injection into silicon strip modules
– Noise injection into DC-DC converters
• Contribute to the development & characterization of magnetic field
tolerant and radiation hard DC-DC buck converters, in coll. with CERN
PH-ESE group
– Duplicate CERN test-stand for converter noise characterization
– PCB development
– Magnetic field test
– Irradiation tests
• Simulation of material budget of different powering schemes
First round of system tests with comm. buck converters finished.
No concrete plans; concentrate on DC-DC conversion.
• Results summarized by Lutz in October meeting
http://indico.cern.ch/getFile.py/access?contribId=0&resId=0&materialId=slides&confId=41790
System Test with DC-DC Converters
Katja Klein 6Status Report from Aachen
Noise of Enpirion converters
can be controlled by combination
of shielding and filtering (LDO).
--- No converter--- Converter--- Converter + 30m Alu shielding--- Converter + LDO--- Converter + LDO + 30m Alu shielding
• Studies with commercial buck converters documented in Jans thesis CMS TS-2009/003 “System Test Measurements with a DC-DC Conversion Powering Scheme for the CMS Tracker at SLHC”
Work Plan from Mid 2008
Katja Klein 7Status Report from Aachen
• Investigation of system aspects of novel powering schemes
– DC-DC conversion
– Serial powering?
• Noise susceptibility measurements
– Noise injection into silicon strip modules
– Noise injection into DC-DC converters
• Contribute to the development & characterization of magnetic field
tolerant and radiation hard DC-DC buck converters, in coll. with CERN
PH-ESE group
– Duplicate CERN test-stand for converter noise characterization
– PCB development
– Magnetic field test
– Irradiation tests
• Simulation of material budget of different powering schemes
Not yet done, still planned.
Ongoing.
Noise Susceptibility Studies
Katja Klein 8Status Report from Aachen
• Goal: identify particularly critical bandwidth(s) for converter switching frequency
• Bulk current injection test-stand has been set up (Rüdiger)
Noise Susceptibility Studies
Katja Klein 9Status Report from Aachen
• Injection of I=70dBA (3mA) into power lines (2.5V, 1.25V, differential/common mode)
• Results not quite as expected; current interpretation: APV25 on-chip common
mode subtraction is again hiding the real system response
Deconvolution mode;
mean noise of one APV
Mean noise of
one APV;
zoom
Deconvolution mode;
noise of strip 512
Noise of
strip 512;
zoom
Peak at around 6-8MHz
seen for edge strips, but
not in mean APV noise
2.5V, Diff. Mode 2.5V, Diff. Mode
?
Work Plan from Mid 2008
Katja Klein 10Status Report from Aachen
• Investigation of system aspects of novel powering schemes
– DC-DC conversion
– Serial powering?
• Noise susceptibility measurements
– Noise injection into silicon strip modules
– Noise injection into DC-DC converters
• Contribute to the development & characterization of magnetic field
tolerant and radiation hard DC-DC buck converters, in coll. with CERN
PH-ESE group
– Duplicate CERN test-stand for converter noise characterization
– PCB development
– Magnetic field test
– Irradiation tests
• Simulation of material budget of different powering schemes
Done.
Currently covered by CERN.
Done.
PCB for SWREG2 chip done; PCB development ongoing.
PCB Development
Katja Klein 11Status Report from Aachen
• Aim for compactness and low mass
• Study possibilities for efficient low mass shielding (e.g. Parylene-coating)
• Study and improve noise filtering
• First prototype being characterized
• New PCBs expected for April
• In addition: PCB with LTC3568 buck converter;
switching frequency configurable up to 4MHz;
in hands, to be tested
Enpirion EQ5382DLDO LTC3026
3cm
Magnet Test
Katja Klein 12Status Report from Aachen
• Tests performed with 7T NMR-magnet at Forschungszentrum Jülich, close to Aachen
• Enpirion converter, CERN SWREG2, LBNL charge pump tested
both versions with air-core and ferrite coils
• Result: converters with air-core inductors and charge pump worked fine;
converters with ferrite inductors stopped working or lost their efficiency
Uout = 2.5V
Work Plan from Mid 2008
Katja Klein 13Status Report from Aachen
• Investigation of system aspects of novel powering schemes
– DC-DC conversion
– Serial powering?
• Noise susceptibility measurements
– Noise injection into silicon strip modules
– Noise injection into DC-DC converters
• Contribute to the development & characterization of magnetic field
tolerant and radiation hard DC-DC buck converters, in coll. with CERN
PH-ESE group
– Duplicate CERN test-stand for converter noise characterization
– PCB development
– Magnetic field test
– Irradiation tests
• Simulation of material budget of different powering schemes
Presentation by Jennifer
Summary & Outlook
Katja Klein 14Status Report from Aachen
• Simulation studies are far advanced presentation today
• Magnet test done
• Noise injection into modules to be finished
• PCB development continues; focus on low mass, low noise, shielding
• System test measurements are restarting
• Development of test-stand to study systematically the coupling of
noise from air-core inductors to the modules
• Feedback from funding agency needed for longer timescale planning!