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DC Power Sources for the High Power RF Amplifiers

DC Power Sources for the High Power RF Amplifiers. By Rolf Wedberg Review ESS Spoke RF Source 11 – 12 December 2012. Agenda. DC Power s upplies overview Anode power supply Main components Suppliers Expected performance (simulation)

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DC Power Sources for the High Power RF Amplifiers

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  1. DC Power Sources for theHigh Power RF Amplifiers By Rolf Wedberg Review ESS Spoke RF Source 11 – 12 December 2012

  2. Agenda • DC Power suppliesoverview • Anodepowersupply • Main components • Suppliers • Expectedperformance (simulation) • Simple simulation for ringing and envelope vs time • Filament powersupply • Grids powersupplies • Control grid • Screengrid (modulation) • Summary Rolf Wedberg – DC Power Sources for the High Voltage Amplifiers

  3. DC Power Supplies Rolf Wedberg – DC Power Sources for the High Voltage Amplifiers

  4. DC Power Supplies: Overview 1 Anode PS 2 Filament PS’s 2 Control-Grid PS’s 2 Screen-Grid PS’s Rolf Wedberg – DC Power Sources for the High Voltage Amplifiers

  5. Anode Power Supply Rolf Wedberg – DC Power Sources for the High Voltage Amplifiers

  6. Two Outputs In each output For both outputs Vmax = 18 kV pulsewidth 3.5 ms Imax = 18 A pulserate 14 Hz Series-switches Maximum voltagedroop 1 kV dI/dt limitingwithinductorsCapacitorcharger withvoltage and powerregulation Anode Power Supply: Main Components Rolf Wedberg – DC Power Sources for the High Voltage Amplifiers

  7. Anode Power Supply: Suppliers • Thesecomponentsarenotstate-of-the-art • Readilyavailable • Someexamples: • CapacitorCharger: FuG , TECHNIX • Capacitor: Nokian, Hivoltcapacitors, ABB and others • Switches: Behlke, DTI and GihomeqAB • Coils: Unitrafo, Transform and others • Assembly: HighVoltage AB, JACO industries and others Rolf Wedberg – DC Power Sources for the High Voltage Amplifiers

  8. Anode Power Supply: Performance • Main problems: • Series switchescurrentcapability • Output voltageringingdueto the inductive outputs • To check performance Anode Power Supply Simulation • A simple simulation has beenruntoobservebehaviour and ringingof the output voltageof the anodepowersupply • Cable length, filters, cavity etc. havebeenincluded • Assumptions: • Tetrodeconsidered as a switch Rolf Wedberg – DC Power Sources for the High Voltage Amplifiers

  9. Anode Power Supply: Simplifiedcircuit The equivalentelectriccircuitused for the simulations: Rolf Wedberg – DC Power Sources for the High Voltage Amplifiers

  10. Anode Power Supply: Transientregime -6 kV -4 kV -2 kV 0 2 kV 4 kV 6 kV 0 µs 10 µs 20 µs 30 µs 40 µs 50 µs Order-of-magnitudeestimate shows that the tetrodecavityvoltage is stabilizedafter 20 us Enoughtime for the amplifierto be stable on everypulse Rolf Wedberg – DC Power Sources for the High Voltage Amplifiers

  11. Filament Power Supply Vmax 15V Imax 200 A Ramping for 8 min Rolf Wedberg – DC Power Sources for the High Voltage Amplifiers

  12. Grids Power Supplies Screengrid • Max. output: • Voltage 1300 VDC • Current 0.7 A • Negative terminal grounded • i.eFuG or Technix Control grid Max. output: Voltage 400 VDC Current 4 A Positive terminal grounded i.e Delta, FuG or Technix Rolf Wedberg – DC Power Sources for the High Voltage Amplifiers

  13. Summary • The Anode Power supply: • can be madeof an assemblyofcommercialcomponents • is special touse the powergrid in an efficientway and designed for the pulsedload • Grid and filament powersuppliesare ”off the shelf” commercialpowersupplies ThankyouRocio and Vitaliy for helpwith Power Point Rolf Wedberg – DC Power Sources for the High Voltage Amplifiers

  14. Control Grid Connection The controlgridvoltagewillbecomemore negative during RF-pulse. Bootstrapping? The powersupply is workingwithhigh output currentinto the bleeder resistor so that it may sink currentduring the RF-pulse. Rolf Wedberg – DC Power Sources for the High Voltage Amplifiers

  15. Screen-grid Connection: Modulation The Power Supplyneedsprotectionwhenthere is an arc from the anode. The Screengridmay be usedtomodulate, turn off anodecurrentbetween RF pulses. Rolf Wedberg – DC Power Sources for the High Voltage Amplifiers

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