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EPS/Fault Management Software

This document provides an in-depth overview of environmental power subsystem (EPS) fault management strategies implemented by Jimmy Nguyen. It explores hardware protection mechanisms, including over-current protection using polyswitches, battery under-voltage safeguards, and solid-state switches. Key functionalities of the EPS board from ClydeSpace are highlighted, detailing power modes from standby to full load, as well as communication challenges during outages. Additional insights on photodiode angle conversion using a PIC microcontroller are also included, alongside a flow diagram for fault management.

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EPS/Fault Management Software

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  1. EPS/Fault Management Software Jimmy Nguyen Electrical Power Subsystem Member

  2. Overview • Hardware implemented protection • Fault software • Photodiode angle conversion SDS-1 Simulation

  3. Hardware Implemented Protection • ClydeSpace – EPS Board, Solar Panels, Battery • Over-Current Bus Protection • Solid state switches • Battery Under-Voltage • To prevent over discharge • Uses comparator circuit w/ hysteresis. EPS Board (Courtesy of ClydeSpace)

  4. Hardware Implemented Protection • Battery Over-Current -Polyswitch protection - Shuts down supply busses Stand-Alone Battery (Courtesy of ClydeSpace)

  5. Power Modes • Full Load • Normal Operation A • Normal Operation B • Normal Operation C • Normal Operation D • Standby Mode • Load Shed Mode SDS-1 Simulation

  6. Major Problem How do we communicate if all components are off? - Hardware never powers off forever Chrome error icon

  7. EPS Fault Management Flow Diagram

  8. Photodiode • Angle conversion using PIC microcontroller • Testing stages Photodiode Demo Setup

  9. Questions or Comments? Name: Jimmy Nguyen Website: http://sdsl.club.asu.edu/ Email: jnguye22@asu.edu

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