Smart Stove Cooktop Phoebe Liu, Andrew Lin, Claire Wu, Hao Su April 17, 2009

Team Members Phoebe Liu – CEO Hardware filter design Power board circuit design Hao Su - CTO Initialization and configuration of PIC components Main algorithm design Andrew Lin - COO Main algorithm design Software and hardware integration Claire Wu – CFO Control board and power board mechanical design Circuit debugging

Content Background and Innovation System Overview and High Level System Design Business Analysis Timeline What was learnt Future Work Conclusion References Questions

Background An induction cooktop holds a series of burners called induction coils (based on magnetic principles) These coils generate magnetic fields that induct a warming reaction in steel and iron-based pots and pans induction How does induction work? cooktop induction coils saucepan

Motivation Benefits Benefits of induction stove safer: there are no open flames and the surface remains cool to the touch quicker: heating and adjustments are immediate, saving you up to 50% of the cooking time when compared to more traditional methods even heating: hot spots and rings are avoided because the bottom of your cookware heats uniformly easy cleaning: the surface is flat and smooth; spills and overflows do not stick to the cooktop, so they can easily be wiped away

Motivation Scenario A Scenario

Innovation Completely automate your cooking experience Can fit any size of shape and pan Even more energy efficient

Content Background and Innovation System Overview and High Level System Design System Overview and High Level System Design Business Analysis Timeline What was learnt Future Work Conclusion References Questions

System Overview

Power Generation Module Consists of IGBT and diodes in parallel Executes high frequency switching with the voltage and current remaining at zero Composed of resonant inductance and resonant capacitance Quasi-resonant converter

Control Processing Module Uses PIC18F4520 – PWM, ADC features Modules Include: Temperature sensing – two 8-to-1 analog mux Pan detection – digital mux Power On and Off – analog mux LED output – shift registers

Control Processing Module algorithm general processing algorithm

Output Conversion Module/UI Arrays of LED depending on the number of coils in use Temperature Adjustment Module 4 different temperature levels: 0, 250F, 300F, 350F

Casing & Physical Design Proposed Material Actual Material Heat resistance painted wood Pros: – Does not scratch easily – Cheap - $5 Cons: – Not as heat resistant – Harder to clean Ceremic Glass Pros: – High thermal shock rating – Easy to clean Cons: – If broken glass shatters into large fragments – Scratches easily – Expensive - $ Cooktop Cooktop of induction stove

Casing & Physical Design Casing Casing induction stove Needs to provide enough ventaliation for heat Coils mounted and isolated from power board Power board are mounted vertically

Content Background and Innovation System Overview and High Level System Design Business Analysis Business Analysis Timeline What was learned Future Work Conclusion References Questions

Business Analysis Targeting European and Asian Market 1170 thousands units in production in Europe for 2008 [1] Energy Saving Environment-friendly cooking Clean cooking Market Market Potential

Business Analysis Cost Cost Comparison Part Description R&D Cost Prototype Cost Induction heating Elements x 10 $215 $62.31 Variable Cap and MOSFET $9.79 $0 Copper Wie 16GA $16.19 $0 Microcontroller with EEPROM and Flash $60 $10 IC Chips $ $24.97 RJ11 J jack $2 Duty and Tax $14.97 $12.63 Shipping $277 $250 Scew Cap $2.47 $0 Paint $7.94 $0.00 Wood $35.98 $0.00 ICD2 $ $0 Ceremic Glass $0.00 $ Plastic Casing $0.00 $42.68 Total $1,372 $574.56

Business Analysis Cost Cost Comparison Actual prototype cost is cheaper than our estimated prototype cost R&D Financing from ESSEF - $700 Other possible funding include: – Angel investors – SR&ED credits – IRAP

Business Analysis Competition Current Competition MakerModelTotal Power Required Ampacity CostDollar/KW GEPHP9007.4kW40A$1395$189 KenmoreElite 307.4kW40A$ $237 LGLCE kW32A$ $233 KitchenaidKICU kW40A$ $236 FagorIFA-807.2kW30A$ $250 ElectroluxE30IC75FSS7.4kW40A$ $270 VikingVICU1059.0kW40A$ $349 WolfCT30I/S7.2 kW40A$ $410 ThermopixSmart Stove5.9 kW27A$ (+ marketing cost) $97.40

Content Background and Innovation System Overview and High Level System Design Business Analysis Timeline Timeline What was learned Future Work Conclusion References Questions

Timeline Schedule Schedule of First Phase Development

Teamwork Dynamic Phoebe Liu Team Leader Facilitator Dominator Claire Wu Marketing specialist Documenter Distracter Hao Su Devil’s advocate Mediator Attention Seeker Andrew Lin Budget manager Comic

Content Background and Innovation System Overview and High Level System Design Business Analysis Timeline What was learned What was learned Future Work Conclusion References Questions

What was learned Technical Skills – C – PIC features and components implementation – Power distribution and transformer configuration – Induction heating circuit design How to be safe – One of the most dangerous project in ENSC 440 history

Content Background and Innovation System Overview and High Level System Design Business Analysis Timeline What was learned Future Work Future Work Conclusion References Questions

Future Work Limited by SFU power source Can easily increase pixels if we have enough transformers More Pixels of Heating Element GUI interface on touchscreen to allow the user to change temperature level and pan selection LCD Touch Screen and Control Panel

Future Work Detect a pan moving or change the temperature of the pot at the new position Movable Sensing Detection Lowering the power consumption on each oil Use an advanced power circuit design to control power distribution by calculating the percentage of heating elements used Power Distribution Efficiency

Content Background and Innovation System Overview and High Level System Design Business Analysis Timeline What was learned Future Work Conclusion Conclusion References Questions

Conclusion Be careful and have fun!

Conclusion Movie time!

Question?

Acknowledgement Patrick Leung Steve Whitmore Ash Parameswaran Fred Heep Marius Haiducu Gary Houghton Gary Schum Jason Lee ESSS

References [1] Witcheck appliance [2] H Okatsuka, K Taniguchi, T Kakizawa, Electromagnetic Induction heating apparatus capable of heating nonmagnetic cooking vessels, US Patent 4,549,056, 1985 [3] Lee, Min Ki, Method and circuit for controlling power level in the electromagnetic induction cooker, US Patent 5,004,881, 1991Method and circuit for controlling power level in the electromagnetic induction cooker [4] Induction Cooktops, Heat from the friction produced by magnetized molecules: A cool way to cook, NAHB Research Center, Research Center [5] Federal Communication Commission, 2009, [6] IEC – International electrotechnical Commission, 2009, [7] RoHS, 2009, [8] Standards – CSA – Making Standards Work for People and Business

References system Overall system implemtation