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Dual-Voltage Electrical System with a Fuel Cell Power Unit 00FTT-60

Page 2. Overview. IntroductionElectrical Architecture Compatibility with the 42V PowerNetTransient Load PerformanceConclusions. Page 3. Today's Vehicle. Electrical power supplied by an alternatorBelt-driven from the engineRegulated, stable voltage outputWith electrical ?ripple"Power instant

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Dual-Voltage Electrical System with a Fuel Cell Power Unit 00FTT-60

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    1. Dual-Voltage Electrical System with a Fuel Cell Power Unit (00FTT-60) Harry L. Husted Energenix Center Delphi Automotive Systems

    2. Page 2 Overview Introduction Electrical Architecture Compatibility with the 42V PowerNet Transient Load Performance Conclusions

    3. Page 3 Today’s Vehicle Electrical power supplied by an alternator Belt-driven from the engine Regulated, stable voltage output With electrical “ripple” Power instantly available once engine is started No power when engine is off Power output varies somewhat with engine RPM

    4. Page 4 The Fuel Cell Power Unit Operating Principle Electrochemical combination of hydrogen & oxygen to produce electricity (no combustion)

    5. Page 5 Electrical Architecture

    6. Page 6 Compatibility with the 42V PowerNet 42V PowerNet Specifications Static Voltage Limits: 48V max., 30V min. Fuel Cell Electrical Characteristics Per-cell voltage is roughly 1.1 volts (no-load) To achieve desired voltage levels, cells are electrically connected in series, the physical plates forming a “stack”

    7. Page 7 Electrical Characteristics A fuel cell voltage/current plot is often called a “polarization curve” (right)

    8. Page 8 Number of Cells in Stack Initial calculation Target 36V as a min. voltage Use VCELL-MIN = 0.7V

    9. Page 9 Designing for Electrical Compatibility Compatible with Specifications Compare polarization curves with voltage specifications Compatible with Battery Pack Simulate high-load operation Simulate low-power battery charging from low state of charge (SOC)

    10. Page 10 Polarization Curves for Various Nc Values

    11. Page 11 Simulation of High Load Operation

    12. Page 12 Battery State of Charge (SOC)

    13. Page 13 42V Bus Voltage

    14. Page 14 Simulation of Battery Charging

    15. Page 15 Average Cell Voltage During Charging

    16. Page 16 Transient Simulation Electrical load transients are part of the automotive environment Load transients Unload transients Stack response is in 100’s of milliseconds Fuel processor response can be on the order of seconds

    17. Page 17 Response - 2000W Load Transient

    18. Page 18 Response - 3000W Unload Transient

    19. Page 19 Conclusions Key Factors Electrical Architecture Voltage Bus Specifications Fuel Cell Polarization Curve Minimum Average Per-Cell Voltage Battery Technology Battery Pack Effective for Transient Load-Leveling Allows thermo-chemical processes time to adjust 52 Cells a good match for the 42V PowerNet* * Based on the assumptions used and a Lithium-Polymer Battery

    20. Page 20

    21. Page 21 Further Explanation - High Load Operation

    22. Page 22 Further Explanation - Battery Charging

    23. Page 23 Return to Other Slides

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