Solar array and Charge Control Interface (SACI) Payload and Power Interface (PAPI) Mclasi™

The SACI, PAPI, and McLASI 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 and McLASI boards are general purpose switching cards which are controlled via the SACI. Multiple PAPI/McLASI boards may be combined to increase the system capabilities.

The SACI, McLASI, and PAPI 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 may be used as part of an Integrated Avionics Unit—combining C&DH and EPS functions in one compact assembly.

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Features

Literature

Charge Control & Solar Array Interface Card
10 Solar Array String Inputs with Shunt Option
20 Switched 28V Outputs @ 2A (derated)
Software Battery Charging with HW Backup
Autonomous Charging of Dead Battery
Switch Command & Telemetry Interface
Discrete commanding for up to 74 switches in the system
Solar Array / Battery / Load Current Telemetry
Battery Voltage Telemetry
12 A Total Throughput Current

Dimensions and Mass

Dimensions: 3U Form Factor
Mass: <0.25 kg

SACI/PAPI/McLASI Boards

SACI Typical 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 and Mass

Dimensions: 112 mm x 218 mm x 36 mm
Mass: <0.32 kg

SACI, McLASI, and PAPI are intended 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 switching boards may be used to provide the required switched outputs. A typical system may include 60 or more 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. The SACI board is available as a secondary backplane or as 3U version for systems with slightly lower current requirements and no more than 74 switched channels.

PAPI Typical PAPI Features