Transcript Folie 1 - RWTH Aachen University

DC-DC Conversion Studies –
Status Report from Aachen
Lutz Feld, Rüdiger Jussen, Waclaw Karpinski,
Katja Klein, Jennifer Merz, Jan Sammet
1. Physikalisches Institut B, RWTH Aachen University
Tracker Upgrade Power WG Meeting
February 13th, 2009
Personal
• 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)
Katja Klein
Status Report from Aachen
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Funding
• 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
Katja Klein
Status Report from Aachen
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Work Plan from Mid 2008
• 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
Katja Klein
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Work Plan from Mid 2008
• Investigation of system aspects of novel powering schemes
– DC-DC conversion First round of system tests with comm. buck converters finished.
– Serial powering?
No concrete plans; concentrate on DC-DC conversion.
• 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
Katja Klein
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System Test with DC-DC Converters
• Results summarized by Lutz in October meeting
http://indico.cern.ch/getFile.py/access?contribId=0&resId=0&materialId=slides&confId=41790
--- No converter
--- Converter
--- Converter + 30m Alu shielding
--- Converter + LDO
--- Converter + LDO + 30m Alu shielding
 Noise of Enpirion converters
can be controlled by combination
of shielding and filtering (LDO).
• 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”
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Work Plan from Mid 2008
• Investigation of system aspects of novel powering schemes
– DC-DC conversion
– Serial powering?
• Noise susceptibility measurements
– Noise injection into silicon strip modules
Ongoing.
– Noise injection into DC-DC converters
Not yet done, still planned.
• 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
Katja Klein
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Noise Susceptibility Studies
• Goal: identify particularly critical bandwidth(s) for converter switching frequency
• Bulk current injection test-stand has been set up (Rüdiger)
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Noise Susceptibility Studies
• Injection of I=70dBA (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
2.5V, Diff. Mode
2.5V, Diff. Mode
Deconvolution mode;
mean noise of one APV
Mean noise of
one APV;
zoom
Deconvolution mode;
noise of strip 512
Peak at around 6-8MHz
seen for edge strips, but
not in mean APV noise
?
Katja Klein
Status Report from Aachen
Noise of
strip 512;
zoom
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Work Plan from Mid 2008
• 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
Done.
– PCB development
PCB for SWREG2 chip done; PCB development ongoing.
– Magnetic field test
Done.
– Irradiation tests
Currently covered by CERN.
• Simulation of material budget of different powering schemes
Katja Klein
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PCB Development
• 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
3cm
LDO LTC3026
Enpirion EQ5382D
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Magnet Test
• 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
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Work Plan from Mid 2008
• 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
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Summary & Outlook
• 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!
Katja Klein
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