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Power Converter Characteristics
Involved Peoples
IntroductionA new powering layout with individual powering of each cavity will allow a full operational flexibility and a new way of operating the PS RF 10 MHz system, withimproved longitudinal stability and beam quality. The new converters will be installed in existing building around the PS accelerator to minimize the length of the cables and to optimize the cost and efficiency. The RF3kA converters will have to supply simultaneously the coarse tuning and the fine tuning currents. PSC10 circuit diagram .edms
Power Converter ArchitectureDifferent parts were designed and produced separately, with the option of a Power Converter being finally integrated in a housing rack, with 3 main parts:
Power Converter simplified Architecture .ppt
Power PartThe proposed powering solution is based on twelve RF3kA power converters (eleven operational converters + one test converter). No additional spare converter is foreseen because only ten cavities are used for operation, i.e. one full RF system (cavity + converter) is available as a spare.
RF3kA converter racks .edms
The RF3kA converter consists of one input module (rectifier + power filter + phase shifted inverter) and two output modules(HF transformer diodes rectifier + LC filter) connected in parallel as shown the diagram below. RF3kA schematic .edms
Typical Curves
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 schematic 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 1 or 2 Current sensors (DCCTs: DC current Transducer). Precision is then directly relying on sensor precision: current sensors, 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.
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 ComponentsA 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 is built through two Power Racks. One contains the six Sub-Converter Power Modules, when the second one includes the converter crowbar and DC-contactor systems, the converter power part control electronic, the FGC complete Electronic Chassis, the two DCCTs head and their electronics.
Magnet Types
Machine Installation
Production Contract & Contact History
Converter Circuit Names
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