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ClydeSpace Electronic Power System Yashraj Khaitan Space Sciences Laboratory

ClydeSpace Electronic Power System Yashraj Khaitan Space Sciences Laboratory University of California, Berkeley. ClydeSpace EPS Agenda. AGENDA Requirements Overview Alternatives Features Testing. Overview. 3 Battery Charge Regulators (BCRs) on 6 solar array sections

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ClydeSpace Electronic Power System Yashraj Khaitan Space Sciences Laboratory

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  1. ClydeSpace Electronic Power System Yashraj Khaitan Space Sciences Laboratory University of California, Berkeley

  2. ClydeSpace EPS Agenda AGENDA Requirements Overview Alternatives Features Testing

  3. Overview • 3 Battery Charge Regulators (BCRs) on 6 solar array sections • Independent operation even without battery backup • Maximum Power Point Tracking

  4. Alternatives • BCRs could have been designed using switch mode regulator ICs at a much lower cost • Efficiencies could have increased by conducting MPPT for each solar array

  5. Features • BCR uses Single Ended Primary Inductor Converter (SEPIC) for high efficiency • power conversion • 5V and 3.3V regulators use BUCK converters at 90% efficiency • Over-current protection switches to protect CUBESAT circuitry • Telemetry and Telecommands interface via I2C digital interface • 0.1W system quiescent power consumption • Peak Power Tracking using the CubeSat EPS Peak Power Tracker • Mass = 80g • The 32 ADC channels on the board can be used to track the temperature, current • and voltage of all solar arrays, buses, and the batteries.

  6. Testing and Precautions • The conversion efficiency of the BCRs can be tested by interfacing to a solar panel, USB connector or a 8V current limited power supply • Shorting the batteries to ground while they are connected to the EPS instantly fries the board • The charging source should be connected to the batteries only after closing the pull pin connection, else at least one BCR is damaged • Each battery pack is composed of 2 Lithium Ion cells. Batteries should be stored within a voltage rating of 6.4V to 7.6V at -4F to 68F and charged periodically to prevent permanent damage

  7. Development Plans • Test the board and verify charging efficiencies • Familiarize with the board’s firmware to collect working data on performance of batteries, buses, and solar panels • Test over-current protection circuitry • Test EPS output under a variety of illumination conditions to ensure that worse case 3W output is achieved even under longest shadow conditions

  8. Thank you

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