REFLOW OVEN MOCRO (Manually Operated Compact Reflow Oven)

Team Members Palmer Burks Temperature Control, Power, General Hardware Joey Ward Team Leader, User Interface, Memory Management, Website Maintenance Samuel Cave User Interface, Memory Management, Website Maintenance, General Software Darnisha Johnson Temperature Control, Documentation Coordinator and General Hardware Design Dr. J.W. Bruce Faculty Advisor

MOCRO Manually Operated Compact Reflow Oven

OVERVIEW Introduction Problem Statement Solution Technical Design Constraints Practical Design Constraints Approach and Trade Offs User Interface Timeline References

What is MOCRO? Manually Operated Compact Reflow Oven What’s the point? Who would buy this thing, anyway? So, what’s the catch?

What else is out there? If cost is an issue, you can get this oven for under $20,000! This series of ovens start at $23,500!

Problems with Reflow Ovens that are on the market: Expensive Not Space Efficient

MOCRO is the answer! Cost is a mere $500. Size of whatever toaster oven you want. User profiles can be saved. Last profile used can be recalled. Perfect for prototyping.

CONSTRAINTS Technical/Practical

Technical Constraints Temperature Range MOCRO must operate from 25°C-260 °C Temperature Accuracy MOCRO must maintain the temperature set point within a 25 °C process band. Heating Rate MOCRO must not allow the heating rate to exceed 4 °C /sec. Wetting Time MOCRO must ensure that adequate wetting time is maintained. Interface MOCRO must use a stand-alone user interface.

Practical Constraints Health and Safety Manufacturability

TRADEOFF Relay vs. Triac

MECHANICAL RELAY Advantages: High power Disadvantages: Expensive Coil draws high current Large size TRIAC Advantages: Low cost Small size High switching frequency (compared to relay) Disadvantages: Requires heat sink

Design Progress – AC Schematic

Design Process – AC Board

Design Progress - Logic/Software Accepting user input via hyper terminal Checking temperature and controlling output Functional keypad

USER INTERFACE Liquid Crystal Display / 12 Button Numeric Keypad

Liquid Crystal Display (LCD) 12x2 Digital Readout Displays: Current Temperature Reflow Phase Phase Time Remaining Bar Graph of Total Progress

12 Button Numeric Keypad Temperature Select Profile Select

Design Timeline

Questions? MOCRO Manually Operated Compact Reflow Oven

REFERENCES Research International, A division of CUD Equipment Corporation, “Reflow Technology Handbook," December 2006, Manncorp. Manncorp nncorp.com/smt_reflow_ovens.php nncorp.com/smt_reflow_ovens.php