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Solar Powered Battery Charger

Solar Powered Battery Charger. Kevin McDowall, Joshua Ivaldi , Muhammad Mustaqeem Khatri, and Alfredo Elias Department of Electrical and Computer Engineering University of Connecticut Advisor: Dr. Sung Yeul Park Date 19 April 2013. Outline. Motivation Specifications

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Solar Powered Battery Charger

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  1. Solar Powered Battery Charger Kevin McDowall, Joshua Ivaldi, Muhammad Mustaqeem Khatri, and Alfredo Elias Department of Electrical and Computer Engineering University of Connecticut Advisor: Dr. Sung Yeul Park Date 19 April 2013

  2. Outline • Motivation • Specifications • Buck Converter Topology • Sensors • Microcontroller • Algorithm • Design Details • Results • Cost • Conclusion • Questions

  3. Motivation • Decided to leave IFEC work and start new work on Solar Battery Charger for better design experience • Design topologies are similar so will help us in transition

  4. Buck Converter Topology 24V ≤ Vin ≤ 48V Vout < 13.8V Buck converter is a step-down DC to DC converter Therefore, buck converter topology was chosen Block Diagram

  5. Sensors Need sensors for feedback purposes The input voltage and current are monitored, as is the output voltage and current. This is done with current sensors and operational amplifier comparators.

  6. Microcontroller Board The microcontroller chip is TMS320F28335, coded in C++. The board monitors input current, input voltage, output current, output voltage and current battery charge.

  7. Control Algorithms • The control board is coded to operate three different algorithms; Constant Current, Constant Voltage and Maximum Power Point tracking. • Constant Current – The first stage of the charging process. Will charge battery to about 95% completion

  8. Constant Voltage • The second stage of the charging process. The battery is supplied 13V across its terminals until the full charge is reached.

  9. MPPT • Maximum Power Point Tracking (MPPT) – Sunlight conditions change, so there is need to constantly calculate maximum power available from PV panel

  10. Design details: Power Circuit Schematic Isolator for signal transfer

  11. Design details: Voltage Supply Schematic 12 Volt Supply 5 Volt Supply

  12. Design details: Sensor Schematic Comparator Comparator Current Sensor

  13. PCB Layout • Altium Designer • 4 layers • Top Layer • 5V Layer • 3.3V Layer • GND Layer

  14. Results • Slight errors in sensor readings • Modification required in the gate driver • Able to run all algorithms successfully

  15. Board Cost The total cost to produce the power board is: $162.06 Cost of control board: $102.80 The cost of a 220W solar panel is: ~$350

  16. Conclusion and Learning Experience • We have achieved all specification and design requirements • Learned: • PV Model • Battery Charging algorithms • Design of schematic and PCB board • Able to combine knowledge from courses such as microcontrollers, power electronics, and digital control systems

  17. Questions???

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