Critical design review
Download
1 / 52

Critical Design Review - PowerPoint PPT Presentation


  • 119 Views
  • Uploaded on

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.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Critical Design Review' - qamra


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Critical design review

Critical Design Review

Ahmad Alawadhi

Eric Willuweit

Kegan Grimes

Kyle Chessman

Sean Flodberg

Team Iron Chefs

Eric


Cdr agenda
CDR Agenda

  • The Design

  • Project Status and Goal

Eric



Pdr review
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-system

Eric


Concept overview
Concept Overview

  • Adjusted approach

    • Hardware and Software Interaction

  • Sub-systems

    • Sensor

    • Power Stage

    • Gate Stage

    • Feedback

Eric


Adjusted approach
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



Preliminary sub system implementation
Preliminary Sub-system Implementation

  • Systems

    • Indicator LEDs

    • Sensors

    • Copper coils

Eric


Current sub system implementation
Current Sub-system Implementation

  • Systems

    • Indicator LEDs

    • Induction sensing

    • Power Supply

    • Resonant Circuit

    • Gate Driver

    • Microcontroller

Eric



Kegan


Led location
LED Location

Each coil has at least five LEDs

LEDs on

LEDs off

Kegan


Led use cases
LED Use Cases

LEDs on

LEDs off

Kegan


Led use cases1
LED Use Cases

LEDs on

LEDs off

Kegan


Led use cases2
LED Use Cases

LEDs on

LEDs off

Kegan


Sensor sub system

Sensor Sub-system

Kegan


Sensor sub system circuit
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


Sensor sub system circuit1
Sensor Sub-system Circuit

A bridge rectifier and low pass filter turns the AC signal across the coil into a DC signal.

Kegan


Sensor sub system1
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


Testing potential sensors
Testing Potential Sensors

  • Photodiodes

  • Induction sensing

  • Infrared LEDs

  • Pressure sensing / Mapping

Kegan


The transitron
The “Transitron”

  • JB Saunders

  • A three terminal device

  • Light enters the base region and causes electrons to be injected into the emitter.

Kegan


Transitron evaluation
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


Transitron pros and cons
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


Consensus:

No thank you, transit-tron

Kegan





  • Input Power

    • 120VAC at 60Hz

  • Common mode choke

  • Bridge Rectifier

Sean



Sean


Power igbts
Power IGBTs

  • ON Voltage – 15V

    • Supplied from gate driver

  • Rated For:

    • 1200V

    • 40A

  • Reverse conduction diode

  • Heat:

    • Cool using an aluminum heat sink

Sean



  • Matching Impedance

  • LC Tank:

    • Resonant Frequency

  • Matches switching frequency with resonant frequency to maximize power output

SW

Sean



Testing hardware
Testing Hardware

  • Variable Auto-Transformer

  • Audible IGBT switching

    • Cast iron pan warmed up

  • Observed Risks

    • Current regulation

      • 8 fuses blown

    • Capacitor sustaining charge

Sean



  • HW-SW Bridge

  • TOPREF – Top reference

  • SWREF – Feedback

    • Compare the two references

PWM

Kyle


Texas instruments c2000
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


Results

Results

Kyle


Induction sensor
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




Prototype board
Prototype Board

Common Mode Choke

IGBTS

Driver Circuit

Resonant Tank

Bridge Rectifier

Ahmad




Future milestones
Future Milestones

  • Finish one-coil subsystem

  • Design seven-coil system

  • Design software to accommodate seven coils

  • Integrate subsystems

Ahmad


Potential risks
Potential Risks

  • Magnetic Field

  • Connecting to mains

  • Probing High voltages

  • High current pollution back to the auto-transformer

Ahmad





Member roles
Member Roles

Primary

Secondary

Ahmad


Questions
QUESTIONS?

Ahmad


ad