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P13027: Portable Ventilator
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  1. P13027: Portable Ventilator Team Leader: Megan O’Connell Matt Burkell Steve Digerardo David Herdzik Paulina Klimkiewicz Jake Leone

  2. Technical Review Overview • Engineering Specs • Proposed redesign • Battery and Power Calculations • Power: Electrical • Electric Board Layout • MCU Logic • Pressure Sensor • Thermal Analysis • Housing Modifications • Project Comparison • Project Schedule • Questions? 2 of 52

  3. Engineering Specifications 3 of 52

  4. Revision B- Proposed Redesign Update: • Battery Size-> Reduce Size & keep same capacity • Reduce Circuit Board size-> Create custom board for all electrical connects • Phase motor driver to a transistor • Display Ergonomics • Overall Size and shape of PEV • Instruction manual Additions: • Visual Animated Display-> Moving Vitals • Memory capabilities • USB extraction of Data • Co2 Sensor as additional Feature to PEV • Overload Condition due to Pump Malfunction 4 of 52

  5. Revision B- Proposed Redesign Update: • Battery Size-> Reduce Size & keep same capacity • Reduce Circuit Board size-> Create custom board for all electrical connects • Phase motor driver to a transistor • Display Ergonomics • Overall Size and shape of PEV • Instruction manual Additions: • Visual Animated Display-> Moving Vitals • Memory capabilities • USB extraction of Data • Co2 Sensor as additional Feature to PEV • Overload Condition due to Pump Malfunction NOT Discussed within Technical Review 5 of 52

  6. Battery Choice: Tenergy Li-Ion • 14.8 V • 4400mAh • 0.8375 lbs • 7.35cm x 7.1cm x 3.75cm • Rechargeable up to 500 times • Price: $50.99 6 of 52

  7. Power Calculation 7 of 52

  8. Charger (Brick) • HP AC Adapter • 18.5V • 3.5Amps • Power: 65W • Max power: 70W • Price: $14.35 (Amazon) 8 of 52

  9. Regulation of Power 9 of 52

  10. Maxim Integrated MAX1737 Battery-Charge Controller Wide input voltage range (6-28 V) Charges up to four Li+ Cells (4-4.4V per cell) Provides overcharge protection 10 of 52

  11. Texas InstrumentsLM3940 Low Dropout Regulator Provides 3.3V from a 5V supply Low Dropout Regulator Can hold 3.3V output with input voltages as low as 4.5V Few external components needed for implementation 11 of 52

  12. 5-18, 24 V Input voltage range Can deliver output currents greater than 1 A No external components needed for implementation Internal thermal overload protection ON SemiconductorMC7800 Voltage Regulator 12 of 52

  13. System Operation Flowchart 13 of 52

  14. 14 of 52

  15. 15 of 52

  16. 16 of 52

  17. 17 of 52

  18. 18 of 52

  19. Control System 19 of 52

  20. MCU Pinouts 20 of 52

  21. General PCB Parts Placement 21 of 52

  22. SpO2Sensor • Difference in Absorption between Red and Infrared is used to determine SpO2 22 of 52

  23. SpO2 Sensor Continued Simplified Design: 23 of 52

  24. SpO2 Flow Chart 24 of 52 Source: Freescale Pulse Oximeter Fundamentals and Design

  25. Hardware/Software Feature Implementation Plan • 1- High Priority- This will get implemented • 2- Medium Priority- Foreseeable difficulties may prevent proper implementation • 3- Low Priority- Attempt to implement if time constraints allow 25 of 52

  26. Initial strategy for Testing 26 of 52

  27. Mass Flow Analysis(Between Pump outlet and Ventilator outlet) Replacing Mass Flow Sensor with Venturi Analysis Assume incompressible flow, 10 diameters of straight tube, C=.99 27 of 52

  28. Differential pressure sensor selection 28 of 52

  29. Freescale-mpxv5050dp Pressure Sensor 29 of 52

  30. Temperature Compensation 3.3 V 30 of 52

  31. Expected Pressure change & voltage output 31 of 52

  32. Expected Centerline Velocity 32 of 52

  33. EXPECTED Total Head Loss 33 of 52

  34. Expected Major Head Loss Bernouli’s Equation Assumptions • Constant velocity, height and air density Major Head Loss: • Dependent on length of tube between ventilator and pump exit 34 of 52

  35. Expected Minor Head Loss Bernouli’s Equation Assumptions • Constant velocity, height and air density Minor Head Loss • Dependent on the expansion and contraction for Reducer and Diffuser 35 of 52

  36. Exhaust Pressure Sensor 36 of 52

  37. Mechanical Relief Valve Pressure Release at 1 psi  Reusable 37 of 52

  38. Thermal Analysis Heat Dissipation GOAL: Analyze worst case thermal analysis of system to understand effects of system heat dissipation. ① System Components: ④ Control Volume Schematic: ② Applied Heat Loads: PEV T∞=330Kh= 5 W/m^2K(Applied to all surfaces) ③ Assumptions: Neglect Radiation Casing acts as a control volume System Location at hottest temp every recorded for U.S 330K Heat flux is applied at bottom surface where all components will rest on. Free External Convection Q flux=80 W 38 of 52

  39. ⑤ Heat Dissipation Results: High Temperature: 359 K 86 ⁰C For our material, Polystyrene, The glass transition temperature is 95 ⁰C. Therefore at worst case scenario, the material will hold shape without deforming. Top of enclosure shows little heat transfer concern to handle so user can carry device. A rubber handle will be included on prototype as a precautionary measure as well as usability purposes. 39 of 52

  40. Another approach… ① BottomSurface Heat Dissipation: ② Assumptions: Component temperature is worst case. System has been under worst case condition for extended period of time. Neglect convection and radiation on bottom surface. • ③ Results: • Plastic temperature at worst case will never exceed 120⁰F due to component heating alone. • This temperature is not enough to deform the polystyrene surface or cause damage to surrounding components. 40 of 52

  41. Housing Modifications • 13026 Physical Extremes: • 15in long X 10in high X 7in deep • Projected 13027 Physical Extremes: • 12in long X 7.5in high X 7in deep 41 of 52

  42. Housing Modifications 42 of 52

  43. Housing Modifications Speaker Mode O2 Sensor port CPR Compression # CO2 Sensor port Manual Mask tube ports Power 43 of 52 BPM Flow Rate Pressure Limit

  44. Housing Modifications 44 of 52

  45. Housing Modifications 45 of 52

  46. Housing Modifications 46 of 52

  47. Housing Modifications 47 of 52

  48. Housing Modifications 48 of 52

  49. Project Comparison GOAL: Analyze the size and weight reduction between major contributing components of MSD 13026 PEV to our projected design. 49 of 52

  50. Summary: 50 of 52