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GLAST Large Area Telescope: Electronics, Data Acquisition & Flight Software TEM Power Supply Part 2 Gunther Haller PowerPoint Presentation
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Gamma-ray Large Area Space Telescope. GLAST Large Area Telescope: Electronics, Data Acquisition & Flight Software TEM Power Supply Part 2 Gunther Haller Stanford Linear Accelerator Center Manager, Electronics, DAQ & FSW LAT Chief Electronics Engineer haller@slac.stanford.edu

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slide1

Gamma-ray Large Area Space Telescope

GLAST Large Area Telescope:

Electronics, Data Acquisition & Flight Software

TEM Power Supply

Part 2

Gunther Haller

Stanford Linear Accelerator Center

Manager, Electronics, DAQ & FSW

LAT Chief Electronics Engineer

haller@slac.stanford.edu

(650) 926-4257

slide2
Team
  • High-Voltage
    • Dieter Freytag (SLAC)
    • Original assist by Art Ruitberg (GSFC)
  • Low Voltage
    • Dave Nelson (SLAC)
    • Assist by Dieter Freytag, Joszef Ludvig (SLAC)
  • Combined Board
    • Dave Nelson (SLAC)
    • Mark Freytag, Dieter Freytag (SLAC)
  • Layout
    • HV section: Cathy (SLAC)
    • Combined Board: Tung Phan (SLAC)
  • Assembly/Parts
    • Lupe Salgado (SLAC)
  • Mechanical/Thermal
    • Dave Nelson, Jobe Noriel, Dave Tarkington (SLAC)
filter section
Filter Section
  • Uses standard MIL-461 filter for flight. Board can also be loaded with commercial filter for EGSE versions (to other sub-systems)
  • See Schematic “Filter” block

28V from PDU

Filter

28-V filtered

tem daq section
TEM DAQ Section
  • Uses delay circuit to turn-on 3.3V to ACTEL FPGA’s on TEM DAQ after 2.5V core voltage (see ACTEL alert)
  • See Schematic “DAQ” block

28V filtered

Delay

3.3V Converter

3.3 V TEM DAQ

2.5V Converter

2.5 V TEM DAQ

cal section
CAL Section

28V switched

28V filtered

3.3 V CAL analog

  • HV starts at 30V
  • HV and LV are switched on/off together (no independent HV switch)
  • PC-board designed so linear regulator can be added in case noise is not low enough
    • Either International Rectifier low-drop linear regulator
    • Regulator with single NPN
  • Baseline is without linear regulator because
    • Higher efficiency
    • Omnirel max output voltage is 3.2V

3.3V Converter

Filter

Switch

CAL enable

3.3 V CAL digital

Filter

3.3V Converter

30V-100V

HV Converter

Cal set voltage (0-2V)

tkr section
TKR Section

28V switched

  • HV starts at 30V
  • HV and LV are switched on/off together (no independent HV switch)
  • PC-board designed so linear regulator can be added in case noise is not low enough
    • Either International Rectifier low-drop linear regulator
    • Regulator with single NPN
  • Baseline is without linear regulator because
    • Higher efficiency
    • Omnirel min input voltage is 2.9V (high for 1.5V output, loose 50% of power in linear regulator)

28V filtered

1.5 V-A TKR analog

1.5V Converter

Filter

Switch

1.5 V-B TKR analog

TKR enable

1.5V Converter

Filter

2.5 V-A TKR analog

2.5V Converter

Filter

2.5 V-A TKR dig

Filter

2.5 V-B TKR analog

2.5V Converter

Filter

2.5 V-B TKR dig

Filter

HV Converter

TKR set voltage (0-2V)

30V-150V

typical low voltage operating circuit
Typical Low-Voltage Operating Circuit

Vref

R

For 1.5V output

  • For 3.3V and 2.5V: set by resistor ratio according to data-sheet
  • For 1.5V output:
    • Can’t just select resistor divider since internal reference is 2.2V
    • Solution: sum in current (resistor from external zener diode) at FB node to offset feed-back voltage
tem ps board
TEM-PS Board

Connector to TEM

Maxim

High-Voltage

high voltage supplies
High-Voltage Supplies
  • SLAC (Dieter)
    • Circuit Design & Simulations (PSPICE)
    • PC board circuit debug/circuit modifications
    • Noise, stability measurements (see example plot)
  • GSFC (Art)
      • Got loaded board from SLAC
      • Phase margin measurements (see plot)
      • Consultation
high voltage noise
High Voltage Noise
  • Courtesy of Dieter Freytag, with RC Filter at output, RMS ~11mV, dominated by 60 Hz-line (need to be remeasured in TPS enclosure)
high voltage amplitude phase
High-Voltage Amplitude/Phase
  • Courtesy of Art Ruitberg
low voltage supplies
Low-Voltage Supplies
  • Mostly Dave Nelson (SLAC)
tkr 1 5v when tkr is turned on
TKR 1.5V when TKR is turned on
  • 28V powered
  • TKR 1.5V supply output when TKR supplies are turned-on via TEM DAQ enable signal
cal 3 3v when 28v is turned on
CAL 3.3V when 28V is turned on
  • CAL 3.3V analog output when 28V supply is turned on (CAL already enabled)
step into feedback
Step into Feedback
  • TKR 1.5V response when 200mW step is applied to feed-back
  • Damped
step into feedback with 50nf
Step into feedback with 50nF
  • TKR 1.5V response when 200mW step is applied to feed-back
  • Better response
amplitude phase of cal 3 3vanalog
Amplitude/Phase of CAL 3.3Vanalog
  • 54 degree phase margin
cal 3 3v analog noise spectrum
CAL 3.3V analog Noise Spectrum
  • * Plot is baseline subtracted
  • Very good performance
tem daq 3 3v noise spectrum
TEM DAQ 3.3V Noise Spectrum
  • * Plot is baseline subtracted
  • TEM digital has no LC filter on TEM PS
  • Still very good performance