Power Distribution System Electronics

The SACI, PAPI, and LASI boards provide a complete spacecraft power distribution system solution. The SACI Board provides a solar array and battery interface complete with battery charge control and telemetry feedback capability. The PAPI/LASI and McLASI boards are general purpose switching cards which are controlled via the SACI. Multiple PAPI/LASI/McLASI boards may be combined to increase the system capabilities.

The SACI, McLASI, and PAPI/LASI are designed to be compatible with a 3U form factor and provide interfaces for a 3U cPCI backplane. In such a setup, the SACI and PAPI/LASI may be used as part of an Integrated Avionics Unit – combining C&DH and EPS functions in one compact assembly.

SACI™ Boards

Typical SACI Features

  • Charge Control & Solar Array Interface Card
  • 14 Solar Array String Inputs @ 6.9 A (derated)
  • 12/14 Array Strings Switched
  • Software Battery Charging with HW Backup
  • Autonomous Charging of Dead Battery
  • Switch Command & Telemetry Interface
  • Controls up to 3 LASI Cards
  • Solar Array / Battery / Load Current Telemetry
  • Battery Voltage Telemetry
  • 8 PRT Sensor Interfaces
  • 3 Low Voltage Switched Outputs @ 5 V, +/-15 V
  • 20 A Total Throughput Current
  • RS-422 Interface
  • Dimensions:
    • 112 mm x 218 mm x 36 mm
    • Mass: <0.32 kg

Program Heritage

  • TacSat-2, XSS-11, AMS (Gen 1 SACI)
  • STP-SIV, Angels, Aquila, LADEE (Gen 2 SACI)

SACI, McLASI, and PAPI/LASI are inteded to be used in an integrated avionics unit. In such a system, a SACI is used together with a custom backplane that also acts as a cPCI backplane. Multiple Boards may be used to provide up to 69 switched outputs. Any cPCI boards such as a CPU and MOAB may be added in the same system to provide a complete spacecraft C&DH and EPS avionics unit.

PAPI™ / LASI™ Boards

Typical PAPI/LASI Features

  • 5 Arm/On/Off Outputs @ 6.9 A each (derated)
  • 10 On/Off Outputs @ 6.9 A each (derated)
  • 2 Arm/On/Off Outputs @ 1.2 A each (derated)
  • 6 On/Off Outputs @ 1.2 A each (derated)
  • 15 A Throughput Current
  • Bus Voltage Telemetry
  • Total Card Current Telemetry
  • Switch Status Telemetry
  • Dimensions:
    • 3U Form Factor
    • Mass: <0.22 kg

Program Heritage

  • TacSat-2, XSS-11, AMS, STP-SIV,
  • Angels, Aquila, LADEE

McLASI™ Boards

Typical McLASI Features

  • 4 On/Off Outputs @ 15 A each (derated)
  • 3 Torque Rod Power Outputs (H-Bridge)
  • Valve and/or Motor Driver Circuitry
  • 20 A Throughput Current
  • Bus Voltage Telemetry
  • Total Card Current Telemetry
  • Switch Status Telemetry
  • Dimensions:
    • 3U Form Factor
    • Mass: <0.20 kg

Program Heritage

  • TacSat-2, Aquila, STP-SIV
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    Founded in 1997, Moog Broad Reach produces spaceflight hardware and software solutions, integrating vehicle design, component design and engineering services for aerospace, scientific, commercial and military customers on four continents.
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