* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download ppt - School of Electrical and Computer Engineering at Georgia Tech
Three-phase electric power wikipedia , lookup
Electrical ballast wikipedia , lookup
Electrical substation wikipedia , lookup
History of electric power transmission wikipedia , lookup
Variable-frequency drive wikipedia , lookup
Current source wikipedia , lookup
Resistive opto-isolator wikipedia , lookup
Power electronics wikipedia , lookup
Immunity-aware programming wikipedia , lookup
Surge protector wikipedia , lookup
Voltage regulator wikipedia , lookup
Switched-mode power supply wikipedia , lookup
Electric battery wikipedia , lookup
Stray voltage wikipedia , lookup
Rechargeable battery wikipedia , lookup
Voltage optimisation wikipedia , lookup
Alternating current wikipedia , lookup
Buck converter wikipedia , lookup
Mains electricity wikipedia , lookup
Battery Management System for a Solar Powered Race Car Joshua Durham Nathan Murdaugh David Trawick Georgia Institute of Technology School of Electrical and Computer Engineering Georgia Tech Solar Jackets March 14th, 2011 Project Overview • A Battery Management System (BMS) monitors voltage, temperature, and current and balances the batteries, as well as cuts the batteries off when limits are reached • BMS ensures batteries stay within safe charge and temperature limits for maximum efficiency • Meets requirements for World Solar Challenge 2011 • Estimated cost of system - $500 Design Objectives • Continuously monitor voltage of individual cells, current in and out of a pack, and temperatures • Balance individual cells • Output measurement data over RS485 • Implement cutoff voltage, current, and temperature limits to protect batteries Current Progress • Topology finalized – 4 parallel packs of 30 cells each • Monitoring IC and sensors ordered and waiting on arrival • Began programming onboard microcontroller Battery Pack Topology – Dual Power Bus Solar Cells Charge Bus Discharge Bus Pack 0 Pack 1 Pack 2 Pack 3 Motor Individual Pack Fail-safes • Each battery pack contains up to 3.4 MJ of energy • Every pack will contain a mechanical safety switch for transport/assembly • A fuse will provide absolute current limiting • During normal operation, the pack will be switched using a FET controlled by its microcontroller Fuse Mechanical Switch FET Pack X Measuring Pack Voltage and Current • Bidirectional current sensor measures charge and discharge currents • Voltage sensor across the FET at the top of the pack compares the pack voltage to the bus LTC6802 BMS IC • Can monitor up to 12 batteries in series • Stackable architecture allows for >1000 V systems • Measures voltages, temperatures, balances individual cells • Outputs measurement data via serial From Higher Voltage LTC6802 To Lower Voltage 6802 Data Collection and Output • A PIC18LF4321 will be used to collect and output all data • Data from the LTC6802 will be collected via a serial peripheral interface • Voltage and current sensors will go though the PIC’s onboard analog-to-digital converter • Data will be output over a RS485 main data line Battery Module PCB Design LTC6802 Current Sensor/Voltage Sensor (top module only) RS485 bus, Serial input from previous module PIC microcontroller (bottom module only) 10 battery cells Project Completion Flow Chart Schedule, Future Work, and Final Delivery • Now until April 1: Complete prototype • April 1-20: Complete full size packs • No later than May 5: Finish demonstration and final report/presentation • Will deliver two full-size packs that can interact properly