EagleSat’s Electronic Power Subsystem

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Presentation transcript:

EagleSat’s Electronic Power Subsystem Jon Lowe

Electronic Power Subsystem (EPS) Outline Requirements EPS Description Power Flow Solar Cells/Panels EPS components Energy Budget

EPS Requirements Launch Power Activity No electronics active during launch Deployment Switch Deployment switch on standoff rail disconnects all power while depressed Access Port Locations All connectors located in designated areas Remove Before Flight Pin Will have a remove before flight pin EPS EPS will manage all power distribution Solar Panels Solar panels will provide sufficient power to fulfill EagleSat’s power need

EPS Description Collects power for EagleSat using solar panels Super capacitors store energy Vcc Batt powers Radio, Regulator Regulator powers Vcc Sys Vcc Sys powers OBC, Temperature sensors, Modem, GPS OBC determines standby/off

Power Flow Solar Panels Voltage Regulator OBC Modem GPS Temperature Sensors Super Capacitors VCC BATT VCC SYS Radio

Solar Cells TriSolX Solar Wings 28% Efficient InGaP/GaAs/Ge Triple Junction Solar Cells: Type- T01 Voltage (Open circuit) 2.62 V Voltage (Max Power) 2.33 V Current (Max Power) 14.6 mA Power (Max Power) 34 mW Dimensions: 26.3mm x 10mm

Solar Panels Side Panels (±Y) Top Panel (-Z) Front Panel (+X)

Supercapacitors Eaton HV1030-2R7106-R 10F (3V) Supercapacitors UL Listing: BBBG2.MH46887 5 per series bank (15V) 2 banks in parallel providing 4F 1125J total charge at max power

Deployment Switches 3 Total switches 2 on standoff rails 1 remove before flight pin Power disconnected when switches depressed and remove before flight pin present

Voltage Regulator RECOM R-78E3.3-0.5 Input Range: 4V-28V Output Voltage: 3.3V Output Current: 500mA

Temperature Sensor Microchip TC1047A Input Voltage 2.5V to 5.5V, 7V absolute max Temperature Range: -40℃ to 125℃ Output Voltage: 0.1V to 1.75V

Temperature Sensor Vout = (10mV/℃)(Temperature ℃) + 500mV

Cumulative Energy Budget

Cumulative Energy Budget

EPS Summary All requirements are met No electronics shall be active at launch Deployment switches prevent EagleSat from being powered when switches are depressed Access ports are present and allow access to connectors while in P- POD RBF pin prevents EagleSat from being powered until removed EPS manages EagleSat’s power distribution Solar Panels provide sufficient power for EagleSat to function properly

Questions?

Backup Slides

EPS Board Schematic

Temperature Sensor Schematic

Remaining Solar Panels Back Panel (-X) Bottom Panel (+Z)

Perfect Energy Budget

Worst Case Scenario Energy Budget