may15-30: fast, compact, high strength magnetic pulse generator
TRANSCRIPT
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May15-30:Fast, Compact, High Strength Magnetic Pulse Generator
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May15-30: Fast, Compact, High Strength Magnetic Pulse Generator
Team MembersAdam KaasLeader
Brittany DuffyCommunication Leader
Alain NdoutoumeSystems Leader & Commissioner
Greg FontanaSimulator
Megan SharpCoil Designer
Meiyong HimmtannWebmaster
Brandon DixonLayout Designer
AdvisorsDr. Mani Mina, Senior LecturerJohn Pritchard, Graduate StudentRobert Bouda, Graduate Student
ClientIowa State University High Speed Systems Engineering Lab
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May15-30: Fast, Compact, High Strength Magnetic Pulse Generator
Presentation Outline• Problem Statement
• Applications/Needs
• Functional/Non-Functional Requirements
• Basic Circuit Idea
• Design Cycle
• Detailed Design and Analysis
• Testing Approach
• Risk Assessment
• Current Project Status
• Future Project Plans
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May15-30: Fast, Compact, High Strength Magnetic Pulse Generator
Problem Statement
• Design a magnetic pulse generator that is:• Fast (1µs)• Compact (3.5” x2”)• High Strength (500 G)
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May15-30: Fast, Compact, High Strength Magnetic Pulse Generator
Applications/Needs
• Fast-switching needs
• Magneto-optics• Magneto-Optic Interferometer
Sagnac Configuration InterferometerPhoto Courtesy of John W. Pritchard
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May15-30: Fast, Compact, High Strength Magnetic Pulse Generator
Functional Requirements• Magnetic field with strength ≥ 500 gauss
• Magnetic Field 1µs pulse
• Consistent Results
Non-functional Requirements• Dimensions ≤ 3.5" x 2"
• Enclosed Device
• DC voltage source ≤ 15 volts
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May15-30: Fast, Compact, High Strength Magnetic Pulse Generator
Basic Circuit Idea
• Pulse to turn MOSFET on and off
• Coil to generate magnetic field
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May15-30: Fast, Compact, High Strength Magnetic Pulse Generator
Design Cycle
Create Layout-Use EAGLE PCB
Optimize Circuit-Optimize circuit components around chosen MOSFET and coil-Rearrange components
Choose MOSFET-Handle design specs-Handle current passing through coil
Simulate-Aim for appropriate rise and fall times using OrCAD
Create PCB-Use Protomat
Solder Components onto PCB
Test PCB
-Determine PCB meets all criteria
Consider Design Specs-Define coil team-Define MOSFET/ circuit team
Choose Coil-Aim for low inductance
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May15-30: Fast, Compact, High Strength Magnetic Pulse Generator
Detailed Design
• Coil
• MOSFET
• Resistors
• Capacitors
• Diode
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May15-30: Fast, Compact, High Strength Magnetic Pulse Generator
Coil
• 500 gauss
• Inductance
• Resistance
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May15-30: Fast, Compact, High Strength Magnetic Pulse Generator
Preliminary AnalysisCALCULATE MAGNETIC FIELDAND INDUCTANCE
TURNS VS CURRENT FOR 500 GAUSS
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May15-30: Fast, Compact, High Strength Magnetic Pulse Generator
MOSFET
• “High Speed”
• Continuous Drain Current (100A)
• Large Max Drain-Source Voltage (50V)
• Low Parasitic Inductance and Resistance
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May15-30: Fast, Compact, High Strength Magnetic Pulse Generator
Resistors, Capacitors, and Diode
• Three Resistors• 49.9Ω, 2Ω, 0.05Ω
• Three Capacitors• 0.01uF, 0.1uF, 220uF
• One Diode• 200 V reverse
breakdown
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May15-30: Fast, Compact, High Strength Magnetic Pulse Generator
Simulations
SCHEMATIC SIMULATIONS
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May15-30: Fast, Compact, High Strength Magnetic Pulse Generator
Eagle PCB/Protomat S62
LAYOUT FABRICATE BOARD
1.49 x 1.30 inches
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May15-30: Fast, Compact, High Strength Magnetic Pulse Generator
Testing Approach
• 0.05Ω Current Sense Resistor
• Magnetic Field Calculations• Current• Number of Turns• Radius of Coil• Length of Coil
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May15-30: Fast, Compact, High Strength Magnetic Pulse Generator
Risk Assessment
• Ordering enough parts early enough to compensate for additional prototyping
• Physical Dangers:• Risk of shock• Risk of burning
• Mitigation of risk:• Following lab safety instructions
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May15-30: Fast, Compact, High Strength Magnetic Pulse Generator
Current Project Status
• Major Milestones:• Working Proof of Concept due 12/19/14
• Parts received 12/3/14• Website developed and up-to-date
• Second Semester Short-Term Goals:• New parts selected by February 3rd
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May15-30: Fast, Compact, High Strength Magnetic Pulse Generator
Plan for Next Semester
• Circuit testing
• Helmholtz coil
• Professionally fabricated PCB
• Device enclosure
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May15-30: Fast, Compact, High Strength Magnetic Pulse Generator
Questions?
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May15-30: Fast, Compact, High Strength Magnetic Pulse Generator
Project Milestones & Schedule
• Assessment of proposed solution: Big progress and better comprehension of what we are doing: (adding capacitors, sensing resistor, SMA connectors to our circuit and etc...)
• Project Plan and Design Document due by end of first semester
• Proof of Concept by 12/19/14
• 4/17/15, final paper complete and deliver final product
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May15-30: Fast, Compact, High Strength Magnetic Pulse Generator
Resource/Cost Estimate- Prototype Hardware and Software
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May15-30: Fast, Compact, High Strength Magnetic Pulse Generator
Resource/Cost Estimate– Final Product
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May15-30: Fast, Compact, High Strength Magnetic Pulse Generator
Equations• •
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May15-30: Fast, Compact, High Strength Magnetic Pulse Generator
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May15-30: Fast, Compact, High Strength Magnetic Pulse Generator
Currents
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May15-30: Fast, Compact, High Strength Magnetic Pulse Generator
Without 2Ω Resistor
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May15-30: Fast, Compact, High Strength Magnetic Pulse Generator
MOSFET Datasheet