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Kate Gleason College of Engineering Multidisciplinary Senior Design Detailed Design Review P12408

Kate Gleason College of Engineering Multidisciplinary Senior Design Detailed Design Review P12408. DDR Agenda. Meeting Timeline. Project Summary. Customer Needs. Engineering Specifications. System Block Diagram. Solar Panel. MPPT and Battery Charger. Battery. Load. Specifications.

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Kate Gleason College of Engineering Multidisciplinary Senior Design Detailed Design Review P12408

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  1. Kate Gleason College of Engineering Multidisciplinary Senior Design Detailed Design Review P12408

  2. DDR Agenda

  3. Meeting Timeline

  4. Project Summary

  5. Customer Needs

  6. Engineering Specifications

  7. System Block Diagram

  8. Solar Panel MPPT and Battery Charger Battery Load

  9. Specifications

  10. Units Used watt (W) is a unit of power in the International System of Units. Joule (J) is a unit of energy or work in the International System of Units. watt hour () represents energy scaled to one hour. Providing a convenient way to quantify energy supply and demand throughout a 24 hour day. Ampere (A) is the SI unit of electric current. Coulomb (C) is the SI unit of electric charge. electrons Ampere hour (A*hr) represents charge scaled to one hour.

  11. Power Requirements

  12. Power Capture Equation

  13. Hourly Power and Daily Energy Capture

  14. Graphical Representation of Hourly Power Lindsey, R. (2009, January 14). Climate and earth’s energy budget. Retrieved from http://earthobservatory.nasa.gov/Features/EnergyBalance/printall.php

  15. DC-DC Converters TDK-LAMBDA Part NO. CC3-1203SF TDK-LAMBDA Part NO. CC3-1203SF RECOM Part NO. RPP20-2412SW Both are through-hole devices *Will use the internal switch of the 12VDC converter to shut off the output *Will need to test

  16. Output Fuse Fuse to be placed at the output of the 12V DC-DC Converter Bourns Part NO. MF-MSMF050-2 , SMT Device Trip Current = 1A , Hold Current = 0.5A , Resistance =0.15Ω • Polymeric Positive Temperature Coefficient (PPTC)/ resettable fuse • A non-linear thermistor acting as a circuit breaker at trip current • The device enters a high-resistance mode while passing a small value of current • When the current is decreased below the trip current value, the device resumes normal operation • The “hold current” value is the nominal operating current value of the PPTC *Will need to test

  17. Energy Collection and Storage

  18. Voltage Converting

  19. Control and Communication

  20. Microcontroller and Firmware

  21. MSP430F2234 • 3.3 V Supply • Max Clock: 16 MHz • 16-Bit RISC Architecture • 8KB Flash Memory • 512 B RAM • 12 Channel 10-bit ADC • UART Interface • 38 pin TSSOP

  22. Operation Modes

  23. Timers • Sensor Evaluation Loop is controlled by a 1-second timer interrupt. This timer uses an external 32 kHz crystal. • Communication timeouts are handled by a 208-µS timer interrupt. This timer uses the internal DCO.

  24. Sensor Operation • The internal and external temperature sensors uses two ADC channels each. • Solar panel sensing uses one ADC channel for current and one channel for voltage and one channel for an external negative reference. • Battery sensing uses two ADC channels for current and one for voltage. • Output sensing uses one ADC channel for current and one channel for voltage.

  25. Fault Handling

  26. Fault Handling

  27. Communication • The NSSPCM uses a modified MODBUS protocol.

  28. Functions

  29. Exceptions

  30. Timing 8N2 at 19200 baud 3.5 char marker is 1.458 mS 1.5 char marker is 0.625 mS

  31. MAX3483 • 3.3 V Supply • 250 kbps • RS-485 • 1.1 mA Supply Current • Half duplex

  32. Mechanical Overview

  33. Structural Design Overall Dimensions Length: 1 meter Width: 0.383 meters Height: 0.252 meters Weight: 0.6027 kg

  34. Front View: Top View:

  35. Material Selection – Aluminum 6061-T6 *Selected for low density, high strength and availability 6061-T6 Material Properties: Density: 2700 kg/m3 Modulus of Elasticity: 68.9 Gpa Poisson’s Ratio: 0.33 Shear Strength: 207 MPa Material Needed (T x W x L, qty): 1/16” x 3/4” x 12’ 1/16” x 3/4” x 10’ 1/16” x 1/2” x 10’ Source: www.matweb.com

  36. Structural Analysis Anticipated Loading on Ascent: Average Speed of Rise: 6.71 m/s (15 mph) Peak Speeds: 22 m/s (50 mph) Force due to Rise: 4.55 N Solar Panel Area: 0.0825 m2

  37. Structural Analysis - Deflection Maximum Deflection: 7.7 mm Modeled using Average rise speed (6.71 m/s)

  38. Structural Analysis – Shear Stress Allowable Shear Stress: 207 MPa Maximum Shear Stress Experienced: 30.5 MPa

  39. Thermal Analysis – Enclosure Expanded Polystyrene: Thickness: 0.035 m Density: 15 kg/m3 Thermal Conductivity: 0.027 W/m-K

  40. Thermal Analysis - Enclosure

  41. Thermal Analysis - Enclosure

  42. Thermal Analysis - Conduction Heat Conditions: Maximum = 2.996 Watts Minimum = 0.3036 Watts Average = 1.02 Watts

  43. Weight Estimation Aluminum = 0.6027 kg Enclosure = 0.195 kg Solar Panel = 0.65 kg Battery = 0.589 kg MPPT = 0.04 kg PCB = 0.09 kg Frame Hardware = 0.25 kg Total = 2.42 kg Specification = 2.5 kg

  44. PCB Layout Board Dimensions 203.20mm x 152.40mm 8.0”(L) x 6.0”(W)

  45. Electronic Component PCB Area 2-Layer Board: Through-hole and surface-mount components Component Dimensions (L x W x H): A=1.59 x 1.0 x 0.46 B=0.90 x 0.65 x 0.33 C= 0.19 x 0.24 x 0.06 D=0.49 x 0.31 x 0.04 E=0.59 x 0.59 x ? F=0.39 x 0.39 x ? G=0.23 x 0.078 x ? H=1.03 x 0.37 x 0.50 I=0.21 x 0.37 x 0.50 J=0.54 x 0.37 x 0.49 *See DDR Document Package for Component Descriptions *Not an exact layout of PCB Board Section Dimensions 2.5(L) x6.0(W) *Dimensions in Inches

  46. Connections To Payload

  47. Preliminary Test Plan • Will present from Edge

  48. Preliminary MSDII Plan • Beginning of MSDII (weeks 1-3) • Will view on external document

  49. Risk Management • Will present from EDGE

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