Battery Box Project (Group #19) PRASH RAMANI MARCOS RIVED MARTIN

INTRODUCTION Many places do not have reliable access to power grid Wind power is cheap/available everywhere Converting wind energy into energy people can use safely

OBJECTIVES 3-phase AC power to single phase DC power Store in a 12V Lead-Acid Battery Power electronics (lights, computers) and charge devices (cell-phones, tablets) Keep entire design cheap, efficient, and safe

INITIAL CHALLENGES High power Safe battery charging methods Keeping costs low Keeping design modular

BLOCK DIAGRAM

RECTIFIER

Wind Turbine: 3-phase AC. 15 Volts RMS Phase- Phase Need single phase DC Expected output: 21V single phase DC

EXPECTATIONS

SCHEMATIC

RESULTS (I) V V V

RESULTS (II) W W

DC-DC CONVERTER

Battery needs 12V-15V to properly charge Expected output: 15V DC Governed by iterative control from Microcontroller

SCHEMATIC

FLOW CHART

RESULTS WITH 20 V OUTPUT V

RESULTS WITH 17 V INPUT V

EFFICIENCY CALCULATION

CHARGING IC

Battery requires Constant Voltage/Constant Current Charging method LT1513 Charging IC administers proper charging for SLA Expected output: 15V, 1.25A Source: BatteryUniversity.com

SCHEMATIC Source: LT1513 Data Sheet

INVERTER

Full-bridge inverter 12 V DC to 12 V RMS AC Transformer V AC

SCHEMATIC

RESULTS V V

USB PORTS AND GAUGE 12.5 V

SUCCESSES Functioning Rectifier Functioning DC-DC Converter with control implementation Functional Rectifier + DC-DC Converter in tandem Inverter Circuit Measuring Charge Level Operational USB ports from Battery

SHORTCOMINGS Charging the 12V Battery Transformer implementation at Inverter output All modules working together

FURTHER WORK Relay implementation for battery Better/more portable form factor PI control instead of iterative control (Efficiency)

CREDITS Mr. Kevin Colravy Mr. Zitao Liao Ms. Katherine O’Kane Mr. Jackson Lenz The rest of the Senior Design staff