critical design review
DESCRIPTION
Critical Design Review. Ahmad Alawadhi Eric Willuweit Kegan Grimes Kyle Chessman Sean Flodberg. Team Iron Chefs. Eric. CDR Agenda. The Design Project Status and Goal. Eric. The Design. Eric. PDR Review. Sense (appropriate ferromagnetic) cookware. - PowerPoint PPT PresentationTRANSCRIPT
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Critical Design Review
Team Iron ChefsAhmad Alawadhi
Eric WilluweitKegan GrimesKyle ChessmanSean Flodberg
Eric
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CDR Agenda The Design
Project Status and Goal
Eric
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The Design
Eric
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PDR Review Sense (appropriate ferromagnetic)
cookware.
Turn on a PWM signal and LED indicator to corresponding coils.
Test multiple types of sensors Photodiodes, induction, infrared, and
pressure mapping
One coil sub-systemEric
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Concept OverviewAdjusted approach
Hardware and Software Interaction
Sub-systems Sensor Power Stage Gate Stage Feedback
Eric
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Adjusted approach Utilize seven smaller copper coils in place of a
large single coil. Sense cookware’s location on the range via
induction sensing. Supply power to the coils that sensed the
cookware.
Eric
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System Flow Diagram
Eric
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Preliminary Sub-system Implementation Systems
Indicator LEDs Sensors Copper coils
Eric
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Current Sub-system Implementation Systems
Indicator LEDs Induction sensing Power Supply
Resonant Circuit Gate Driver Microcontroller
Eric
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LED Indicator Sub-system
Kegan
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LEDs indicate which coils are being supplied with power.
LEDs on temperature knobs lit with same color LED as the powered coils to display which cookware the knobs correspond to.
Kegan
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LED LocationLEDs on
Each coil has at least five LEDs
LEDs off
Kegan
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LED Use Cases LEDs onLEDs off
Kegan
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LED Use Cases LEDs onLEDs off
Kegan
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LED Use Cases LEDs onLEDs off
Kegan
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Sensor Sub-system
Kegan
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Sensor Sub-system Circuit
Coils are also used as induction sensors.
• Placing ferromagnetic cookware above the coil, its measurable impedance changes .
• Impedance change, affects measurable power.
Kegan
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Sensor Sub-system Circuit
A bridge rectifier and low pass filter turns the AC signal across the coil into a DC signal.
Kegan
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Sensor Sub-system
The DC signal is fed into an analog to digital converter to be processed by the microcontroller.
When the voltage across the coil drops below a threshold, the LED turns on and a varying frequency PWM is initiated.
Kegan
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Testing Potential Sensors Photodiodes Induction sensing Infrared LEDs Pressure sensing /
Mapping
Kegan
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The “Transitron” JB Saunders A three terminal device Light enters the base region and
causes electrons to be injected into the emitter.
Kegan
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Transitron Evaluation Voltage change of only ~10mV Fed into an Op-Amp Amplified signal fed to ADC on the
Arduino Uno (used for demo) Turned on the LED when transitron is
covered
Kegan
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Transitron Pros and Cons Pros
Inexpensive Availability Easy Implementation
Cons Requires an amplifier Unreliable Cover with ANY object and the coil supplies a
magnetic field
Kegan
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Consensus:
No thank you, transit-tron
Kegan
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Total Circuit Simulation
Sean
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Sean
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Power Supply
Sean
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Input Power 120VAC at 60Hz
Common mode choke Bridge Rectifier
Sean
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Gate Circuit
Sean
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Gate Drivers High power IGBTs
Sean
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Power IGBTs ON Voltage – 15V
Supplied from gate driver Rated For:
1200V 40A
Reverse conduction diode Heat:
Cool using an aluminum heat sink
Sean
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Resonant Tank
Sean
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SW
Matching Impedance LC Tank:
Resonant Frequency Matches switching
frequency with resonant frequency to maximize power output
Sean
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Sean
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Testing Hardware Variable Auto-Transformer Audible IGBT switching
Cast iron pan warmed up Observed Risks
Current regulation 8 fuses blown
Capacitor sustaining charge
Sean
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Microcontroller
Kyle
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HW-SW Bridge TOPREF – Top reference SWREF – Feedback
Compare the two references
PWM
Kyle
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Texas Instruments C2000 Output:
Seven PWM signals for the final design A variable frequency PWM to find
resonance of cookware and contents
LED power to covered coils Input:
Read analog signals through ADC from the feedback circuit and adjust PWM output accordingly
Additional: Check resonant frequency
approximately every 10 seconds
Kyle
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Results
Kyle
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Induction Sensor
No cookware: 3.2VDC With 15in cast iron pan over coil:
1.77VDC With 6in aluminum pot over coil:
1.69VDC
Set ADC threshold to turn on LED and supply PWM only for cast iron pan
Kyle
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Coil without cookware
Kyle
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Coil with 15” Cast Iron Pan
Kyle
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Prototype BoardCommon Mode Choke
IGBTS
Driver Circuit
Resonant TankBridge Rectifier
Ahmad
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Analog Feedback Circuit
Ahmad
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Complete One Coil System
Ahmad
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Future Milestones Finish one-coil subsystem Design seven-coil system Design software to accommodate seven
coils Integrate subsystems
Ahmad
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Potential Risks Magnetic Field Connecting to mains Probing High voltages High current pollution back to the auto-
transformer
Ahmad
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Spent BudgetItem Quantit
yPrice
1200V, 40A, IGBTs 4 $23.84NPN Transistor 3 $1.02PNP Transistor 2 $2.14
Voltage Regulator 2 $4.04Burton Single Coil Stove 1 $79.95
Photo-sensors 4 ~$4.50Assorted Capacitors and Resistors NA Harvested
Half bridge High voltage Driver Chip 3 $6.45Total $121.94
Ahmad
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Preliminary Parts ListItem Quantit
yCost
Litz Wire – 32AWG, ~900 strand
~200ft Currently uncertain
TI-C2000 1 $0.00 - GivenHigh Voltage Capacitors ~20 ~$100.00
Ferrite Core Wound Inductors ~10 ~$60.00PCB 2 ~$80.00
Fuses ~10 $20.00Ceran Top 1 ~$100.00
Frame 1 Currently uncertain
Total ~$400.00
Ahmad
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50Updated Schedule
Ackhmad
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Member RolesTasks Ahmad
Alawadhi
EricWilluweit
Kegan Grimes
KyleChessman
SeanFlodberg
Software Design
C2000Feedback
DebuggingHardware Design
SensorsPower SupplyGate
CircuitResonant
CircuitDebugging
Primary
Secondary
Ahmad
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QUESTIONS?
Ahmad