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Philippe ROUGER

Philippe ROUGER. Electrical Design. IRAP. 03/28/2011 MAVEN PRE-CDR PEER REVIEW. CONTENTS. ELECTRONIC BOARD: GENERALITY HVPS BOARD Principle Improvements (STEREO to MAVEN) HV COUPLING: Improvements BOARDs ASSEMBLY: Steps CONCLUSION. Entrance grids. HV_AN.

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Philippe ROUGER

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  1. Philippe ROUGER Electrical Design IRAP 03/28/2011 MAVEN PRE-CDR PEER REVIEW

  2. CONTENTS • ELECTRONIC BOARD: GENERALITY • HVPS BOARD • Principle • Improvements (STEREO to MAVEN) • HV COUPLING: Improvements • BOARDs ASSEMBLY: Steps • CONCLUSION MAVEN PRE-CDR PEER REVIEW IRAP

  3. Entrance grids HV_AN HV_MCP HV_DEF_UP V0 HV_DEF_DOWN GND Analyzer Deflectors MCPs I. SWEA POTENTIALS MAVEN PRE-CDR PEER REVIEW IRAP

  4. I. Electronic Boards MAVEN PRE-CDR PEER REVIEW IRAP

  5. I. Electronic Boards • 3 Boards: • HVPS_Board • High Voltage generation (2 kV) • 2kV for deflectors & analyzer • 3,5 kV for MCPs • Voltage Scanning functions • Amplifier Board • Charge amplifiers (A111F) • HV COUPLING • Interface between high/low voltage functions • Collecting Anodes & Mechanical support for MCPs MAVEN PRE-CDR PEER REVIEW IRAP

  6. I. HV COUPLING BOARD Top side MCP and spheres Collecting anodes High Voltage connections to MCP & sphere Bottom side High Voltage decoupling capacitor Connections to Amplifiers Board MAVEN PRE-CDR PEER REVIEW IRAP

  7. I. AMPLIFIER BOARD Bottom side Amptek A111F + Test circuit Connections to HVPS board Top side Amplifiers gain components Connections to HV Coupling board MAVEN PRE-CDR PEER REVIEW IRAP

  8. I. HVPS BOARD Bottom side High voltage parts Top side Low voltage surface mount parts MAVEN PRE-CDR PEER REVIEW IRAP

  9. -12V +12V HV_Analyzer 750V HV ANALYSER Cmd_Analyzer + + - - HK_Analyzer HV_Deflectors 1800V HV DEFLECTORS Cmd_Deflectors HK_Deflectors Cmd_V0 V0 Supply V0 HK_V0 Cmd_MCP HV_MCP 3500V HV MCPs HK_MCP HK HV HVPS BOARD II.1) HVPS BOARD : Principle MAVEN PRE-CDR PEER REVIEW IRAP

  10. II.1) HVPS BOARD : Principle 1.8kV 2kV optocouplers HV Transformer Deflector up Oscillator Voltage Multiplier Deflector Down Analyzer Commands 750V a) Deflectors & Analyzer voltages MAVEN PRE-CDR PEER REVIEW IRAP

  11. II.1) HVPS BOARD : Principle HV b) MCPs voltage 3.5 kV Transformer Cmd MCP + Oscillator Voltage Multiplier MCPs - HK MCP Feedback MAVEN PRE-CDR PEER REVIEW IRAP

  12. Maximum Deflectors Polarity= 1.8kV (1.5 kV Stereo) Review of transformers’ design to avoid saturation at 1.8kV Now able to supply 2kV Voltage ranges for cmd and House Keeping were changed from Stereo Necessity to adapt some resistors value Were calculated and will be confirmed and adjusted by tests II.2) HVPS BOARD : Improvements MAVEN PRE-CDR PEER REVIEW IRAP

  13. III. HV COUPLING : Improvements • On Stereo: Cracks problems during welding of vertical capacitors • Caused by a too high temperature gradient (pads too big) • Solution: Apply solder at each corner and stick that remains PCB and Capacitors previously warmed at 70°C before the welding MAVEN PRE-CDR PEER REVIEW IRAP

  14. IV. Board Assembly: steps • Assembly at MICROTEC (subcontractor) • According to the Planetary Protection Procedure • Tests, adjustments and integration at IRAP Non active components assembly Active components assembly pins (between boards) assembly Harness assembly Tests MAVEN PRE-CDR PEER REVIEW IRAP

  15. V. CONCLUSION • Few electrical design modifications between STEREO and MAVEN • Just on HVPS Board due to new deflectors design and new voltage range values • Board Assembly will finish soon MAVEN PRE-CDR PEER REVIEW IRAP

  16. THANKS FOR YOUR ATTENTION QUESTIONS ? MAVEN PRE-CDR PEER REVIEW IRAP

  17. -12V +12V HV -25V to 750V HV ANALYSER Cmd: 0V to -4V HK: -0.05V to +3.75V HV -25V to 1800V HV DEFLECTORS Cmd: 0V to -1.92V + + + + HK: -0.05V to +3.6V Cmd: 0V to -4V V0 0V to -25V VO Supply HK: 0V to +3.5V Cmd: 0V to +4V HV 0V to 3500V HV MCPs HK: 0V to +5V HVPS BOARD HK HV: gain=0.75 HVPS BOARD:Voltage Ranges MAVEN PRE-CDR PEER REVIEW IRAP

  18. Insulator part screw Conductive part MCP Polarization details Grid V0 spring +300V MCP MCP spacer Metallic part HV_MCP-100V HV COUPLING PCB Anode HV_MCP MAVEN PRE-CDR PEER REVIEW IRAP

  19. ELEC/MECH Connections MAVEN PRE-CDR PEER REVIEW IRAP

  20. MAVEN PRE-CDR PEER REVIEW IRAP

  21. Board Assembly: steps MAVEN PRE-CDR PEER REVIEW IRAP

  22. Board Assembly AMPLIFIER BOARD MAVEN PRE-CDR PEER REVIEW IRAP

  23. Board Assembly HVPS BOARD MAVEN PRE-CDR PEER REVIEW IRAP

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