REFLOW OVEN

MOCRO(Manually Operated

Compact Reflow Oven)

Team Members

Palmer BurksTemperature Control,

Power,General Hardware

Joey WardTeam Leader, User Interface,

Memory Management, Website Maintenance

Samuel CaveUser Interface, Memory Management,

Website Maintenance, General Software

Darnisha JohnsonTemperature Control, Documentation Coordinator

and General Hardware Design

Dr. J.W. BruceFaculty 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, http://www.research-intl.com/reflowhandbook/   

Manncorp. Manncorp. 2007. https://www.manncorp.com/smt_reflow_ovens.php