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Solar Probe Plus FIELDS Instrument Antenna Electronics Box Overview

This document outlines the requirements, specifications, block diagrams, schematics, layouts, mass, power details, parts, schedule, and issues related to the Antenna Electronics Box (AEB) for the Solar Probe Plus FIELDS Instrument.

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Solar Probe Plus FIELDS Instrument Antenna Electronics Box Overview

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  1. Solar Probe Plus FIELDSInstrument PDRAntenna Electronics Box Selda S. Heavner U.C. Berkeley selda@ssl.berkeley.edu

  2. Agenda • Requirements & Specifications • Block Diagrams • Schematics • Layout • Mass and Power • Parts • Schedule • Issues

  3. AEB Requirements • AEB Requirements • AEB shall provide ± 15V Floating Voltage to V1, V2, V3, V4 and V5 preamps (heritage RBSP) • Input is +5V Analog • Efficient >60% • Synchronized to 300KHz • Isolated secondary voltages • 5% output regulation • AEB shall regulate Preamp ±6 V from LNPS to ±5V • AEB shall provide the power and the control signal for the latching relay controls on the preamps (On V5 heater resistors) 3 bias impedances. • AEB shall be a nexus for MF and HF signals from preamp. The signals shall not have any traces on the board. The signals shall arrive on a DB connector and via coax cables (RG316). The signals shall be then connected to TDS, RFS and DFB (also DB connectors). • AEB shall provide housekeeping signals to DCB via multiplexer.

  4. AEB Requirements AEB Specifications Cont. (heritage: THEMIS, RBSP) • Receive Preamplifier Signals • DC Voltage Level : ± 100V w.r.t chassis • Floating Ground Driver (heritage: THEMIS, RBSP) • AEB provides the reference source for each floating ground used by the Preamps • Input : PAn_LFOUT (preamp signal) • Input Filter: 300Hz • Output Voltage Level: ± 60VDC with respect to AGND • Output : References floating ground supply (± 15VDC)

  5. AEB Requirements • BIASING VOLTAGES (V1-V4) AEB shall provide programmable biasing voltages to the V1-V4 preamps as follows: • BIAS (whip): ± 40 w.r.t preamp output • HEATSHIELD: ± 40 w.r.t preamp output • STUB: ± 40 w.r.t preamp output • BIASING VOLTAGES (V5) AEB shall provide a provide a programmable biasing voltage to the V5 preamp as follows: • BIAS (sensor): ± 40 w.r.t preamp output

  6. AEB1 BLOCK DIAGRAM

  7. AEB 2 BLOCK DIAGRAM

  8. AEB 1 Coax DIAGRAM

  9. AEB 2 Coax Diagram

  10. AEB 1 POWER BLOCK DIAGRAM

  11. AEB 1 POWER FLOATING SUPPLY

  12. AEB 2 POWER BLOCK DIAGRAM

  13. AEB 2 POWER FLOATING SUPPLY

  14. AEB FLOATING POWER • AEB Breadboard Power Results • The supply is 68% when powered by 3.3V Digital at nominal load • The supply efficiency is expected to rise since MAX256 will be connected to 5V Analog from LNPS. • MAX 256 3W H-bridge driver • Has an internal oscillator so if SYNC signal is lost from DCB it will still run • Short circuit protection • Thermal shutdown • Used on RBSP, submitted to APL Jan 2013 for approval

  15. 15VF POWER SCHEMATIC

  16. CHANNEL: BIAS STUB HEATSHIELD

  17. FLOATING GROUND DRIVER

  18. LAYOUT and PARTS • LAYOUT • AEB ETU Layout started in October 2013. • Schematic will be finalized after peer review • MASS and POWER • ± 12V and ± 100V is now generated by LNPS. Helped mass. • Power updates are submitted to LNPS. No issues so far. • PARTS • MAX256 approval submitted to APL January 2013 • DAC121S101 has not been used on heritage designs. Submitted to APL and approved. 12-bit , low power • Multiplexer on AEB UT16MX110. • ISSUES • Connecting 12V to heater resistor on preamp (V5) • DAC needs to be at mid-scale when powered on. New DAC is at zero after power on reset.

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