000166124 001__ 166124
000166124 005__ 20190509132404.0
000166124 0247_ $$2doi$$a10.5075/epfl-thesis-5104
000166124 02470 $$2urn$$aurn:nbn:ch:bel-epfl-thesis5104-1
000166124 02471 $$2nebis$$a6451972
000166124 037__ $$aTHESIS
000166124 041__ $$aeng
000166124 088__ $$a5104
000166124 245__ $$aPower Distribution Solutions for Large Hadron Collider Upgrades
000166124 269__ $$a2012
000166124 260__ $$bEPFL$$c2012$$aLausanne
000166124 300__ $$a171
000166124 336__ $$aTheses
000166124 520__ $$aIn view of the Large Hadrons Collider experiments upgrade,  where the inner front-end electronics will require higher  supply power, a new power distribution scheme has to be  designed. This thesis presents a new and more efficient  scheme based on step-down DC-DC converters, which will be  placed close to front-end electronics where it will be  exposed to intense radiation (250 Mrad) and magnetic field  (4Tesla). Other than tolerance to these fields, additional  constrains are small volume and mass and low noise emission  not to affect the sensitive front-end electronics. Since no commercial component can meet these requirements,  an Application Specific Integrated Circuit (ASIC) DC/DC  converter has been developed and is presented in this work.  The chosen converter topology is the buck because it presents  the best compromise in terms of efficiency and low mass among  the different compared topologies. Radiation hardness can be achieved with appropriate choice  of the semiconductor technology combined with layout  modifications. Magnetic field tolerance is attained with the  use of an air core inductor whose shape can be toroidal for  limiting the magnetic field emissions. All the ASIC building blocks are presented in this thesis  likewise their design methodology: their schemes and the  transistors sizing are discussed as well as the AC analysis  to grant the stability of the output voltage over the  selected range of frequencies. Three different prototypes had been integrated in the two  chosen semiconductor technologies (mainstream and backup).  Tests showing high efficiency (up to 85%) and the required  level of radiation hardness are presented and discussed.
000166124 6531_ $$apower distribution
000166124 6531_ $$aDC-DC converter
000166124 6531_ $$aradiation hardening
000166124 6531_ $$aair core inductors
000166124 6531_ $$adistribution d'énergie
000166124 6531_ $$aconvertisseur à découpage
000166124 6531_ $$arésistance aux radiations
000166124 6531_ $$ainductance à noyau d'air
000166124 700__ $$aMichelis, Stefano
000166124 720_2 $$aKayal, Maher$$edir.$$g105540$$0240539
000166124 8564_ $$uhttps://infoscience.epfl.ch/record/166124/files/EPFL_TH5104.pdf$$zTexte intégral / Full text$$s13661593$$yTexte intégral / Full text
000166124 909C0 $$xU11978$$0252315$$pELAB
000166124 909CO $$pthesis$$pthesis-bn2018$$pDOI$$ooai:infoscience.tind.io:166124$$qDOI2$$qGLOBAL_SET$$pSTI
000166124 918__ $$dEDMI$$cIEL$$aSTI
000166124 919__ $$aGR-KA
000166124 920__ $$b2012
000166124 970__ $$a5104/THESES
000166124 973__ $$sPUBLISHED$$aEPFL
000166124 980__ $$aTHESIS