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Luigi Schirone professor of Electronics Aerospower Laboratory Managed by: Slide 2 PROJECTS IN THE FIELDS: SPACE MILITARY TEST EQUIPMENT AUTOMOTIVE Slide 3 - PCDU design - design of photovoltaic generator - design of battey system - assembling and testing of flight units Electrical Power Supplies for space vehicles SPACE Micro-nano satellite: ALMASat TIGRISat AMALIA Lunar Mission: AROV APPLICATIONS: Slide 4 Power Conversion Distribution Unit board : - R=99.9% according to MIL-STD-217F - patented MPPT in I/F with solar array EPS for space APPLICATIONS: SPACE Slide 5 The AROV Power Conversion and Distribution Unit APPLICATIONS: SPACE Slide 6 6 Battery and bus management: approach #1 A classical sun regulated bus. Each battery is an 8S array of Li-Ion 18650 cells. Manufacturer: ABSL Each APR indipendently supply both the Main Bus and an auxiliary bus for BCR's (Picture from the ABSL WEB site) TRADITIONAL APPROACH Slide 7 7 Battery and bus management: approach #2 A regulated bus. Each battery consists of a single High-Capacity Li-Ion cell (1S1P) The idea after observing that the required capacity VES cells by SAFT The challenge: high voltage ratio (Picture from SAFT WEB site) SINGLE-CELL BATTERY Slide 8 Tri-phase inverter 400Hz, 27Vdc/36Vac with digital controller on CPLD (Flight unit for Rotary-Wing produced in Eastern Europe) Activities - design - prototypes for acceptation & flight tests - pre-series MILITARY APPLICATIONS: Slide 9 Automatic test-bench for solar cell characterisation client: European Space Agency ESTEC Solar Generator Section TEST EQUIPMENT Slide 10 Wireless charging Hybrid power sources AUTOMOTIVE APPLICATIONS: Slide 11 Wireless charging APPLICATIONS: AUTOMOTIVE Work recently started Coils for 1kW wireless transmission Slide 12 HYBRID POWER SOURCES APPLICATION: AUTOMOTIVE Configuration of the investigated system: Preliminary tests for dc-link < 150V The available source: Maxwell, 48V, 130 Arms, 168F, 6.3mOhm Slide 13 STUDENT PROJECTS Slide 14 AUTOMATIC SUN TRACKING Photovoltaic system for polar mission Minimize surface of solar panel Selection of the best angle of inclination Slide 15 Tether propulsion Attitude control via modulation of electric power Slide 16 R&D High-efficiency switching converters Wireless power transfer Low-THD sinewave generators Photovoltaic power conditioning Slide 17 Best efficiency > 98% Accurate loss model Max voltage gain > 20x High efficiency dc-dc converters Slide 18 Dynamic control of Dead-time (a)(a) (b)(b) Slide 19 Low THD sinewave generators Performance of our 400Hz inverter