Transcript access to power grid

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
RECTIFIER
• Wind Turbine: 3-phase AC . 15 Volts RMS PhasePhase
• Need single phase DC
• Expected output: 21V single phase DC
EXPECTATIONS
SCHEMATIC
RESULTS (I)
-22.20 V
-20.20 V
-21.0 V
RESULTS (II)
16.498 W
45.048 W
DC-DC CONVERTER
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
15.128V
RESULTS WITH 17 V INPUT
15.051V
EFFICIENCY CALCULATION
CHARGING IC
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
INVERTER
• Full-bridge inverter
• 12 V DC to 12 V RMS AC
• Transformer 12-110 V AC
SCHEMATIC
RESULTS
+11.781V
-11.825V
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