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Power Converter Characteristics
Involved Peoples
Power Converter ArchitectureThis Power Converter is used in LHC Machine to power superconductive magnets. It is located in the LHC underground installation, close to the loads to limit cable losses in the underground installation. Different parts were designed and produced separately, Power Converter being finally integrated in a housing rack, with 3 main parts:
Power Converter simplified Architecture .ppt
Power PartA medium current switch mode power converter, designed for powering of superconducting loads requiring positive or negative current and positive or negative voltage control (4 quadrants). Constructed from a modular architecture composed of 2x [+/-400A +10V] power modules (active redundancy), the system can most of the time provide required current to the load since often less than |400A|, even with 1 Power Module only. Primary use is in LHC particle accelerator irradiated locations (redundancy and Radiation tolerant). The converter is water cooled, and is thus ideally suited to situations where air losses must be carefully managed. Designed for underground operation, extensive remote diagnostics have been foreseen to allow efficient monitoring and fault diagnostics without requiring being present locally. Power part is identified as a 4 quadrant voltage source, even if an internal current source control is required to adequately share output current between power modules.
[+/-400A +/-10V] Power Module simplified Architecture / Topology Power Part .vsd Power Module is actually a high frequency fully bidirectionnal (+/-400A +/-10V) current source (7-8kHz) controlled by a 1kHz bandwidth voltage loop. One can notice that Power Module is actually a current cource in its structure, even if voltage source capacitors are located in this block for mechanical reasons. Representation below gives a symbolic structure of the power converter, clarifying the cascade loops. The multiplication of rectifier stages in each output module gives the following advantages: easier design of magnetic parts, lower rating fuse (lower losses) to protect whole Power Converter being short-circuited by a faulty secondary (fuse would immediately blow in case one of the schottky dies, giving the possibility to the whole power converter to reconfigure the current level in other current sources to maintain required voltage level). [+/-400A +/-10V] Voltage Source simplified Architecture / Topology .vsd Redundance operation relies mainly on [+/-400A +/-10V] inner current source reactivity, and strongly depends of the output current level (400A limit), so that load output current is not impacted by the loss of one sub. Of course a sudden short at the level of the output stage of a sub converter will lead to a converter global fault stop. No fault - Sub Fault Transition - Sub Fault state Power converter redundance
Control PartControl & regulation principles are summarized in a detailled schematics representating only the part involved in the output current regulation scheme. Control & regulation principles are summarized in a detailled schematics representating only the part involved in the output current regulation scheme. Regulation Control simplified schematic .vsd High precision current control loop is managed by the digital controller called FGC (Function Generator Controller). This unit includes a high precision Sigma Delta Analog to Digital Converter which digitalize the analog current measurement coming from 2 DCCTs (DC current Transducer). Precision is then directly relying on sensor precision: DCCT, the ADCs, and the algorithm being used for the regulation loop. Voltage source is then used as a power amplifier, powering the load through a high bandwidth voltage loop (>500Hz).
Magnet ProtectionPower Converter is part of magnet protection scheme, even if not directly fully responsible of the monitoring and diagnostic of the superconductive magnet status. Dedicated systems QPS (Quench Protection System) + PIC (Power Interlock Controller) can interlock Power Converter if magnet safety requires it. Power Converter is then expected to:
Power Converter Components .vsdA power converter is actually a sum of different equipments under several different sections in the SY-EPC group. The modularity is a key factor for easier maintenance with regards to LHC tunnel access conditions. Power Converter Rack can accept up to 2 Power Converters. Electronic Chassis, fan tray unit and AC-DC Power Module are shared in such a case.
Magnet Types
Machine Installation
Production Contract & Contact History
Production Quantity
R2E parts definition vs use .xls
Spare Cards/Components Strategy
R2E Spare Cards/Components Strategy .xls Converter Circuit NamesRPMBA.RR13.RQS.A81B1 RPMBA.RR13.RQS.L1B2 RPMBA.RR13.RQT12.L1B1 RPMBA.RR13.RQT12.L1B2 RPMBA.RR13.RQT13.L1B1 RPMBA.RR13.RQT13.L1B2 RPMBA.RR13.RQTL11.L1B1 RPMBA.RR13.RQTL11.L1B2 RPMBA.RR17.RQS.A12B2 RPMBA.RR17.RQS.R1B1 RPMBA.RR17.RQT12.R1B1 RPMBA.RR17.RQT12.R1B2 RPMBA.RR17.RQT13.R1B1 RPMBA.RR17.RQT13.R1B2 RPMBA.RR17.RQTL11.R1B1 RPMBA.RR17.RQTL11.R1B2 RPMBA.RR53.RQS.A45B1 RPMBA.RR53.RQS.L5B2 RPMBA.RR53.RQT12.L5B1 RPMBA.RR53.RQT12.L5B2 RPMBA.RR53.RQT13.L5B1 RPMBA.RR53.RQT13.L5B2 RPMBA.RR53.RQTL11.L5B1 RPMBA.RR53.RQTL11.L5B2 RPMBA.RR57.RQS.A56B2 RPMBA.RR57.RQS.R5B1 RPMBA.RR57.RQT12.R5B1 RPMBA.RR57.RQT12.R5B2 RPMBA.RR57.RQT13.R5B1 RPMBA.RR57.RQT13.R5B2 RPMBA.RR57.RQTL11.R5B1 RPMBA.RR57.RQTL11.R5B2 RPMBA.RR73.RQS.A67B1 RPMBA.RR73.RQS.L7B2 RPMBA.RR73.RQT12.L7B1 RPMBA.RR73.RQT12.L7B2 RPMBA.RR73.RQT13.L7B1 RPMBA.RR73.RQT13.L7B2 RPMBA.RR73.RQTL10.L7B1 RPMBA.RR73.RQTL10.L7B2 RPMBA.RR73.RQTL11.L7B1 RPMBA.RR73.RQTL11.L7B2 RPMBA.RR73.RQTL7.L7B1 RPMBA.RR73.RQTL7.L7B2 RPMBA.RR73.RQTL8.L7B1 RPMBA.RR73.RQTL8.L7B2 RPMBA.RR77.RQS.A78B2 RPMBA.RR77.RQS.R7B1 RPMBA.RR77.RQT12.R7B1 RPMBA.RR77.RQT12.R7B2 RPMBA.RR77.RQT13.R7B1 RPMBA.RR77.RQT13.R7B2 RPMBA.RR77.RQTL10.R7B1 RPMBA.RR77.RQTL10.R7B2 RPMBA.RR77.RQTL11.R7B1 RPMBA.RR77.RQTL11.R7B2 RPMBA.RR77.RQTL7.R7B1 RPMBA.RR77.RQTL7.R7B2 RPMBA.RR77.RQTL8.R7B1 RPMBA.RR77.RQTL8.R7B2 RPMBB.RR13.ROD.A81B1 RPMBB.RR13.ROD.A81B2 RPMBB.RR13.ROF.A81B1 RPMBB.RR13.ROF.A81B2 RPMBB.RR13.RSS.A81B1 RPMBB.RR13.RSS.A81B2 RPMBB.RR17.ROD.A12B1 RPMBB.RR17.ROD.A12B2 RPMBB.RR17.ROF.A12B1 RPMBB.RR17.ROF.A12B2 RPMBB.RR17.RSS.A12B1 RPMBB.RR17.RSS.A12B2 RPMBB.RR53.ROD.A45B1 RPMBB.RR53.ROD.A45B2 RPMBB.RR53.ROF.A45B1 RPMBB.RR53.ROF.A45B2 RPMBB.RR53.RSS.A45B1 RPMBB.RR53.RSS.A45B2 RPMBB.RR57.ROD.A56B1 RPMBB.RR57.ROD.A56B2 RPMBB.RR57.ROF.A56B1 RPMBB.RR57.ROF.A56B2 RPMBB.RR57.RSS.A56B1 RPMBB.RR57.RSS.A56B2 RPMBB.RR73.ROD.A67B1 RPMBB.RR73.ROD.A67B2 RPMBB.RR73.ROF.A67B1 RPMBB.RR73.ROF.A67B2 RPMBB.RR73.RQ6.L7B1 RPMBB.RR73.RQ6.L7B2 RPMBB.RR73.RQTL9.L7B1 RPMBB.RR73.RQTL9.L7B2 RPMBB.RR73.RSS.A67B1 RPMBB.RR73.RSS.A67B2 RPMBB.RR77.ROD.A78B1 RPMBB.RR77.ROD.A78B2 RPMBB.RR77.ROF.A78B1 RPMBB.RR77.ROF.A78B2 RPMBB.RR77.RQ6.R7B1 RPMBB.RR77.RQ6.R7B2 RPMBB.RR77.RQTL9.R7B1 RPMBB.RR77.RQTL9.R7B2 RPMBB.RR77.RSS.A78B1 RPMBB.RR77.RSS.A78B2 ... to_be_filled |
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