Power Supply Report July 2002 - University of California...

PS Status ReportR. D’Alessandro

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Power Supply Report Power Supply Report

• 3 page review of the system proposed• The delivered prototypes (a short history)• Prototype Qualification• System Test Setup (TIB)• First Results from the System Test


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Proposed SystemProposed System•Detector modules powered in parallel at a relatively long distance (~ 120 m) from the PS.

–Group detectors together (up to 60 APVs) –Use sense wires to regulate voltages on the load (LV only)

Implies

•High Currents (10 Amps)•Relatively high voltage drops (4V)•Efficiency issues (variable loads)•Isolation at HF of the PS

Why 120 m ?•Place PS in a “safe” environment•PS always accessible


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PowerUnit

System ArchitectureSystem Architecture

PSM

•A PSM houses 2-4 PSUs and their control logic.•PSMs share the +48 V supplied by Power Units ( PU).•PSMs are grouped in crates (9-10 PSM/crate )•The PSM rack ( PSM array ) is driven by one dedicated Controller, which is interfaced to the CMS Slow Control

Controller


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The Prototype PSUThe Prototype PSU• PWM (Switching PS)

– (less power dissipation in the PSU)

• 2 HV generators– (extra flexibility for

detector biasing inside a given group)

• Relay switches– (disconnect the cable

from the PSU)• Low stray capacitance

transformers– Improve HF isolation


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Short History (1)Short History (1)• Project given the go ahead 20th April 2000• Prototypes ordered:

– October 2000 (CAEN), December 2000 (LABEN)• First release: (many iterations between Fi and manufacturers)

– June 2001 (CAEN), November 2001 (LABEN)• June 2001, Torino releases its test box• Prototypes returned to the manufacturers for

rework concerning isolation, stability, behavior during transients


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Short History (2)Short History (2)• CAEN prototype back at the

beginning of 2002, isolation improved plus other fixes

• Given to Torino for testing (plus debugging of the test box)

• April 2002, first results presented for CAEN (still some problems with transient behaviour)

• May 2002, CAEN modifies prototype (shorter response time plus “crow bar”), LABEN delivers its revised prototype.


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Old Slide (May 2002)Old Slide (May 2002)• LABEN prototype tested in Florence,

CAEN in Turin (an exact repeat of the testing sequence performed on the earlier version with the Turin test box)

• Both manufacturers readily answered queries and sent personnel to Turin and Florence to solve minor issues.The work done by both manufacturers is evident in the progress made both for what concerns the prototypes functionality and the over-voltage and over-current behaviour.


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Short History (3)Short History (3)• May 2002 LABEN takes prototype in Milan• June 2002, CAEN prototype back from

Torino• July 2002, LABEN prototype back from the

manufacturerIn the meanwhile in Florence we have:•developed various cable prototypes •developed ( help from Torino) a fast switched load•assembled and debugged the first all optical + CCU25, silicon module readout


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CAEN prototypeCAEN prototype• Based on existing SYxxxx solution• ONE PSU per board (2 boards delivered)

• Prototype at the level of an evaluation board• Software in good shape

LABEN prototypeLABEN prototype• Developed from scratch• TWO PSUs per board (2 boards delivered)

• Prototype at “final” engineering stage• Software in its infancy (euphemistic)


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CAEN prototypeCAEN prototype


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LABEN prototypeLABEN prototype


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Qualification Qualification (the procedure)(the procedure)

• Use of “traditional” lab equipment• Gain an understanding of the measurement

complexities• Appraise the performance of the PS

prototypes• Subsequently use the Torino automated

test fixture for detailed repetitive and/or long term measurements


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Qualification Qualification (the hardware)(the hardware)

The basics:• Static loads• MOS switched loads• LCR meter(s)• Digital scope(s)• Cables

PS are floating ?• Careful screening• Well defined grounding• Differential measurements

Laben crate

CAEN crate


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NOISE MeasurementsNOISE Measurements•BW < 20 MHz•Small capacitors 22 uF•Noise @ 6 Amps (2.5V) and 4 Amps (1.25V), depends very little on drawn current

•Measurements shown are with 50 metrecable (ext. 12 mm)

•Adding another 100 metre doesn’t change much (seems to have a beneficial effect)


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LABEN LABEN (LV Noise)(LV Noise)


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LABEN LABEN (HV noise)(HV noise)


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LABEN LABEN (Transients 1.25V)(Transients 1.25V)


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LABEN LABEN (Transients 2.5V)(Transients 2.5V)


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LABEN LABEN (Isolation)(Isolation)


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LABEN LABEN (comments)(comments)

• Stable behaviour (independent of load and cable length)

• Noise, is it acceptable ? (Especially HV)

• Transient behaviour generally very good (current limits, etc.); can the response time to voltage overshoots be bettered still ?

• Isolation is impressive, showing an understood capacitive behaviour

• Prototype designed with final engineering in mind

• Software not only a problem of looks, but essential parts (like trip and ramping procedures) missing. (A. Bocci in Florence is working on it)


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CAEN CAEN (LV noise, 2.5V)(LV noise, 2.5V)


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CAEN CAEN (LV noise, 1.25V)(LV noise, 1.25V)


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CAEN CAEN (HV noise)(HV noise)


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CAEN CAEN (Transients 1.25V)(Transients 1.25V)


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CAEN CAEN (Transients 2.5V)(Transients 2.5V)


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CAEN CAEN (Isolation)(Isolation)


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CAEN CAEN (comments)(comments)

• “Stable” behaviour (except for the 1.25V which is dependent of load and perhaps cable length, but can be fixed)

• Excellent Noise performance• Transient behaviour generally good (current

limits, etc.) there is an exception in a “pathological” condition.

• Isolation is good • Prototype designed as an evaluation board, not

clear how it will scale to engineering stage and how the presentperformance depends on the eval. Board arch.

• Software excellent, shows the great amount of work the company has put in general on PS systems.


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Where did we start from…Where did we start from…

•Noise, current limit, over voltage, a long learning curve for both manufacturers and also for us.


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General CommentsGeneral Comments• Prototype qualification is ONGOING• Results shown are the first, after the

definition of a systematic approach in order to have a reproducible set of measurements

• We will extend this approach to also include the Torino test box for repetitive and long term measurements

Both prototypes substantially answer our specifications as stated in the various documents we produced. Can they be used for the system test ? YES! (with caveats)

Above all the prototypes themselves need the system test in order to be further developed !


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TIB system testTIB system test• Not only for PS but “evolving” into a fully

fledged mechanical and electrical test– NEEDS optical decoupling to achieve

meaningful results• At first we needed a relatively good

understanding of an optical system compared to a copper one:– Many measurements made (Marco Meschini

talk, yesterday at the module test meeting)


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La La barabara

CCU25

DOH

Power distribution PCB


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La La barucciabaruccia


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From Marco’s talk (1)From Marco’s talk (1)• Front end APV25-s1 on FR4 hybrid, TIB

module, 300 um thick

12 way optoreceiver

3 Lasers A.O. Hybrid


34Input/Output temporary connections on the back of module carrier

Final Kapton cable could be even shorter than this one

Short distance APV-AOH

From Marco’s talk (2)From Marco’s talk (2)


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What went insideWhat went inside• We placed a fixed resistor (5 Ohm value) on

both LV lines• Modules/Hybrids connected through TIST:

– Straight feed-through of the PS lines– CMOS buffering (same as used in final string)

• 47uF + 100nF blocking capacitors (per Module)• HV filter (specially for LABEN, but used also with CAEN)


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What went outsideWhat went outside

• Industrial PC dedicated to this test– two FEDs– one FEC– one TSC– one Digital Optical Transceiver– one Analog Optical Receiver

Plus a battery to supply 5 Volts to the Digital Opto-Hybrid and CCU ring !


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Software Software • “Standard” Module Test software (Lyon)• Modifications for :

– Laser driver (new version)– DOH, FEC – CCU 25

• The software works with two FEDs butcan only address one I2C channel at a time

•Allows direct comparison, with the module test suite


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Operating conditionsOperating conditions• Inverter out• MUX 100 Ohms (15 setting)• AOH, gain 3, bias 18 (new LDD!), 50 Ohm

termination• Standard M.Raymond parameters for the APV

• 50 metre “internal” + 100 metre “external” cable, which transports also sense wires and HV lines

• One common grounding point defined on the CCU ring (la bara is completely isolated from the “outside”)

• The PS are in another room


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Inverter effect Inverter effect (old CAEN L3)(old CAEN L3)

Inverter out

Inverter in


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The module and the The module and the hybrid survived !hybrid survived !

All measurements refer to a hybrid and a full TIB module triggered and read-out at the same time

ns

AD

C co

unts

CAEN 150m

TIB 09, 200V bias


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Common Mode with Common Mode with CAENCAEN TIB09

200 V biasHV filterDeconv

ADC channels

ADC channels

Peak


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Noise profile with CAENNoise profile with CAENTIB09,200 V biasHV filter

Deconv

APV strip

RMS/

stri

p

APV strip

RMS/

stri

p

Peak


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Common Mode with Common Mode with CAEN (2)CAEN (2) TIB09

200 V biasNO! HV filterDeconv

ADC channels

ADC channels

Peak


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Common Mode with Common Mode with LABENLABEN TIB09

200 V biasHV filterDeconv

ADC channels

ADC channels

Peak


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Common Mode with Common Mode with LABEN (2), Inverter INLABEN (2), Inverter IN

TIB09200 V biasHV filter

Deconv

ADC channels

ADC channels

Deconv

In case you weren’tconvinced !


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TIB09,200 V biasHV filter

Deconv

APV strip

RMS/

stri

p

APV strip

RMS/

stri

p

Noise profile with Noise profile with LABENLABEN

Peak


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APV strip

RMS/

stri

p

APV strip

Noise profile Hybrid Noise profile Hybrid CAEN CAEN -- LABENLABEN

CAEN

LABEN

RMS/

stri

p

The difference is the HV !

Deconvolution


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Hard Reset effects (1)Hard Reset effects (1)

CAEN,150 metre cable2.5V-nores1.25V-0.45Ohm

250 us/div

50 m

V/di

v


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Hard Reset effects (2)Hard Reset effects (2)

LABEN,150 metre2.5V & 1.25 noresistors

1 ms/div

1 ms/div

50 m

V/di

v

50 m

V/di

v

LABEN,150 metre2.5V & 1.25 5 Ohm


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ConclusionsConclusions• We have started !• PS work has given fruit to what we think

is a viable option for the Tracker (next months will give a definite answer)

• We will keep interacting with CAEN and LABEN to solve the remaining issues

• The DAQ is stable, (no glitches, no spurious hard resets !)

• Only two hybrids but ready to read-out up to 6 simultaneously


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Conclusions (2)Conclusions (2)This PS project is a collaboration between

Florence and TorinoThe TIB system test between

Florence and PisaThanks to a lot of people (a few names):

– CERN (J. Troska, F. Vasey, S. Marchioro, C.Paillard, L. Mirabito)

– Perugia (B. Checcucci, M. Brunetti)– Pisa (Roby Dell’Orso, R. Cecchi)– Torino (M. Costa, P. Trapani)

Thanks also to F. Maletta, M. Brianzi, E. Scarlini


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System Architecture (1)System Architecture (1)

Power Supply Report July 2002 - University of California...

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