Power Board for IlliniSat-2 Project

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Presentation transcript:

Power Board for IlliniSat-2 Project Group 32 Roberto Suarez, Rachit Goel, Sam Kearney TA: Kevin Bassett ECE 445 Spring 2013

IlliniSat-2 Project Background Generic bus for a 2 or 3U Cubesat Systems to communicate with and power payloads ADACS Command & Data Handling Communications Power IlliniSat-2 Bus Model from IlliniSat-2 website: cubesat.ae.illinois.edu

Power Board Features Battery Charging/MPPT Battery Protection Overvoltage/Undervoltage Protection Cell balancing Temperature monitoring/regulation 16 DC buses 8 unregulated (7.4V) buses 8 regulated (3.3V) buses Current Monitoring/Overcurrent Protection

Top-Level Block Diagram Power Lines Signal Lines PV Cells Input Voltage and Current Sense Battery Charging Circuit (4 switch buck-boost converter) Voltage and Current Sense Main Battery Output to satellite subsystems, payload Battery Monitoring/ Switching Circuitry Unregulated Buses x8 Overcurrent Protection Gate Drive Circuits Control Backup Battery Buck Converter Regulated (3.3V) Buses x8

Test Boards Main board Battery board Battery charging circuit Buck converter (7.4V to 3.3V) 2 DC buses (1 unreg, 1 reg) w/ OC protection Microcontroller Battery board Overvoltage/Undervoltage Protection Cell balancing

Battery Charging Circuit Requirements and specifications: Input: Spectrolab 28.3% UTJ Solar Cells 7.05 – 21.28 V (depending on # of cells) 0 – 1.1 A Output: ___ Lithium Ion Battery Pack 7.4V nominal, 6.0 – 8.2V safe range Max current 2.2 A Layout: 2” x 1” Over 90% efficiency

4-Switch Buck-Boost Converter

EPC GaN FET Advantages: Disadvantages: Small footprint (1.08 mm x 1.7 mm) High efficiency low RDS(on) (16 mΩ) low QG (2.48 nC) Disadvantages: Bumped die configuration very difficult to solder digikey.com

Microcontroller Interfaces: DC bus enable and current measurement Charge enable/discharge enable for batteries PWM output for battery charging circuit Voltage and current measurement on BCC RTD temperature sensing Output to Kapton heaters Communication with C&DH Implemented on test board Microchip PIC18F87K22 alliedelectronics.com

Maximum Power Point Tracking Spectrolab UTJ Solar Cells IV Characteristic (spectrolab.com)

Testing ~8 V P-P

Future Work Replacement gate driver: TI LM5113 Gate-source voltage clamped to 5.2 V maximum www.ti.com