Power supply system (FLIGHT PROOF)

Power supply system (FLIGHT PROOF)

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Sputnix Orbicraft-Pro power supply system uses power supply unit SXC-PSU-03  module for power control in assistance with SXC-BAT-03 battery unit for energy storage and up to 14 solar panels (typically SXC1-SPT-03 and SXC1-SPS-03) as electrical source. External battery charging rail presents on PC/104 connector and is typically traced to USB connector on the front of satellite service panel. Battery module data exchange use dedi-cated interface.
 
Solar panels connect to 3 input channels, each per one satellite axis. PSU also supports usage of solar panels with built-in electromagnetic coils by single connector. PSU board has coils con-tacts traced to PC104. Satellite’s solar panel on every axis are connected by cable system and have a separate connector on PSU. This makes available to enlarge coils, built into each solar panel, in a series manner to summarize their magnetic field. Overall there are three panel input connections on PSU, one per axis. The coils driver signals pass through PC/104 connector to car-rier board. Charger units with maximum power point tracing support both types of photo ele-ments: GaAs and Si, with the only condition – correct voltage level.

PSU has built-in 4-channel output power switch with current and voltage protection and te-lemetry on every channel. General PSU telemetry is also available on CAN bus and contains in-formation about battery condition, input power, temperature, and fault status. In addition to 4 built-in output channels there are 3 external enable signals to drive auxiliary power switch located on carrier board, which can separately activate sensors, main computer and sun sensor devices.

There are number of battery protections provided by power supply system, including thermal sensors, heaters and switches that makes the whole system operate in satellite temperature range of about -40..+85 degrees, but for every particular flight the appropriate thermal calculations should be done and took into account.

Hardware watchdog circuit has long-term period of 25 hours (configurable) and can be reset only by command from the ground station. This exclude software dead loops of any kind. There are several software watchdogs as well acting as a software functions supervisor.

Software reliability increased with failsafe configuration memory access and built-in boot-loader with supports safe in-flight firmware updates.

Features:
•    3 independent charger units with MPPT function 
•    up to 86% input converters efficiency
•    Solar panels with coils support
•    4 output channels with current limits
•    Failsafe output switch with timers
•    RBF switch connection
•    Long-period hardware watchdog circuit
•    Rich telemetry 

Configuration:
•    Watchdogs conditions and periods
•    RBF switch connection
•    Battery protection levels
•    External charger current limit

Sputnix Orbicraft-Pro battery unit SXC-BAT-03 provides electrical power storage with basic protections and sensors. Typically it’s used with SXC-PSU-03 power supply unit con-nected by data and power interfaces. Power storage consists of two series Li-Ion cells with sum-mary 10 Ah capacity, board is equipped with balancing circuit.

Battery module supports RBF switch connection with physical bus disconnection. It also has precision voltage and temperature sensors. There are current limit protection with electrical power bus switch to prevent battery damage.
Built-in battery heaters allows to extend operating temperature range.

Features:
•    Large power storage 
•    RBF switch connection 
•    Built-in current and voltage protections and sensors
•    Digital interface 

Configuration:
•    Heaters power
•    Protection limits

Power supply unit SXC-PSU-03

Properties

Dimensions (w/o PC104 connector)

96 х 89 х 14

Mass

58g

Solar panels channels

3

Solar panel type

GaAs, Si

Solar panel voltage

3..6V

Maximum solar panel current per channel

1500 mA

Maximum summary solar panels current

3000 mA

System bus voltage

8V (from solar, charger), 6.0V – 8.4V (from battery)

Output channels

4

Output channels voltage

direct from system bus

Output channel maximum power

1500 mA

Summary output current

5000 mA

Battery type

LiFePO4, Li-Ion

Battery voltage

2S

Charge voltage

4.5 … 5.5 V

Charge current limit

1.1A (default)

Power consumption, max

0.16 W – without solar power

RBF switch

Two separate RBF connectors, Separate disconnectable RTC ground

Data interfaces

CAN2B x 2

Battery UART.

Perfomance

Low-power MCU

Hardware:

CPU Cortex-M4 16 MHz

256 KB Flash

64 KB SRAM

15 mW power consumption

Software:

Watchdogs, RTC, MPPT, Flight plan, bootloader

Discrete hardware watchdog period

25 h (typical)

Battery heater channels

2

Maximum heater channel current

1000 mA

Telemetry

Input power voltages and currents, battery voltage and current, Output channels currents, temperature.

Operationg conditions

Operating temperature range

-40...+85°С

Storage temperature

-50..+105°С

Mechanical vibration

12 g (request full test report)

Mechanical shock

50g (request full test report)

Testing*

Functional

QT, AT

Vibration

QT, AT (on  demand)

Mechanical shock

QT

Thermal cycling

QT, AT (on  demand)

Thermal vacuum

QT, AT (on  demand)

Battery unit SXC-BAT-03

Properties

Dimensions (w/o PC104 connector)

97 х 83 х 34.5

Mass

360g

Interfaces

PC104, RBF connector

Data interface

UART, 115200 8-N-1

Perfomance

Battery type

Li-Ion

Battery voltage

2S (5.0V – 8.5V)

Capacity

10.6 AH (39.8 WtH)

Current protection limit

5.0 A

Voltage protection limits

5.0 V, 8.5 V

Battery heater channels

2

Heater resistance

40 Ohm (typ)

Telemetry

Voltage, temperature

Operationg conditions

Operating temperature range

-40...+85°С (-20..+60 for longer battery life)

Storage temperature

-50..+105°С

Mechanical vibration

12 g (request full test report)

Mechanical shock

50g (request full test report)

Testing*

Functional

QT, AT

Vibration

QT, AT (on  demand)

Mechanical shock

QT

Thermal cycling

QT, AT (on  demand)

Thermal vacuum

QT, AT (on  demand)

*QT is performed on the design/qualification model
AT is performed on the unit to be shipped

 

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