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Power Generation and Distribution WINTER ’99 REVIEW

Power Generation and Distribution WINTER ’99 REVIEW. Chieh-Kuen Woo Team Leader. PGD TEAM. MENTOR: Dr. Hal Tharp (ECE) LEADER: Chieh-Kuen Woo MEMBER: Kwanduck Kim, Kok-Hian Tan Solar Panels design: Kwanduck Kim, Chieh-Kuen Woo Power Subsystem design: Kok-Hian Tan, Chieh-Kuen Woo.

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Power Generation and Distribution WINTER ’99 REVIEW

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  1. Power Generation and DistributionWINTER ’99 REVIEW Chieh-Kuen WooTeam Leader

  2. PGD TEAM • MENTOR: Dr. Hal Tharp (ECE) • LEADER: Chieh-Kuen Woo • MEMBER: Kwanduck Kim, Kok-Hian Tan • Solar Panels design: Kwanduck Kim, Chieh-Kuen Woo • Power Subsystem design: Kok-Hian Tan, Chieh-Kuen Woo

  3. Areas of Investigation • Power Subsystem – Direct Energy Transfer (DET) • Power Source – Power from Solar Panels (Body Mounted) with different satellite surface area

  4. Power SubsystemDET System • Shunt Regulator : Shunt Drivers (transistors) and Shunt Resistors • Charger and Batteries • Voltage Comparator: Compare load voltage with preset voltage, and send error signal to Digital Control Logic if the load voltage is 1% less than preset voltage. • Digital Control Logic: • Will control over: - Shunt Regulator: - on/off the transistors • Charger: - charge or discharge

  5. DET Block Diagram

  6. Solar Panels • Body mounted solar cells : Gallium Arsenide (GaAs) cells • Ratio of solar cells area to satellite area (one side) • 6 sided, 8 sided, and 12 sided had been studied. • Larger area of each side (6 sides) has higher ratio than the small area (12 sides) • %: (Area of Cell arrays mounted on one side)/(Area of satellite[one side])

  7. Solar Panels (cont.) • Power output from designed area • >> Power calculation with (2cm * 4cm) GaAs cells: • 12 sided : 36W • 8 sides: 38W • 6 sides: 33W

  8. Battery Pressure Vessel

  9. What needs to be done in Spring’99? • Prototyping the subsystem • Comparator circuit • Power source • Basic model of DET system • Further investigation on the subsystem • Digital Control Logic

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