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Switching Power Supply

Overview. Problem:No power supplies are on the market today to accept input voltages ranging from 90 to 310 VAC; therefore, the power companies must use three separate power supplies to accept this range. Solution:Design a switching power supply to accept the wide input voltage range required b

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Switching Power Supply

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    1. Switching Power Supply Advisor: Dr. Noel Schulz Frankie Runnels (TL EE) Jeremy Stevens (EE) Timmy Carpenter (EE) Dereck Lenoir (EE) Carl Jeffery Jones (EE) Sponsor: Mississippi Power Company

    2. Overview Problem: No power supplies are on the market today to accept input voltages ranging from 90 to 310 VAC; therefore, the power companies must use three separate power supplies to accept this range. Solution: Design a switching power supply to accept the wide input voltage range required by Mississippi Power Company (MPC) with constant 13.5 VDC output.

    3. Design Constraints Input voltage ranges from 90 to 310 VAC Output voltage is a constant 13.5 VDC Output power ranges from 0 to 40 watts The output noise level will be less than 0.5 V pk-pk Will install in a 3”x6”x9” industrial case

    4. Advantages Utility companies can use one power supply instead of three Less training will be required since the power supply will be universal Power supply more cost efficient than traditional power supplies

    5. Design Flow Chart

    6. Switching

    7. Failed Attempts Schottky Diode: - Schottky has a faster reverse recovery time - Replaced flyback diode with silicon carbide Schottky diode - Operated fine at no load - Failed at full load

    8. Failed Attempts (cont’d) Output Filtering: Noise spikes at 100KHz and ringing at 7MHz Implemented Low pass filter with fc =100Hz and a -40 dB rolloff Radiated noise at the 100KHz frequency Did not eliminate all spikes on output Researched a better filter using ceramic capacitors and inline inductors

    9. Noise Elimination Snubber Circuits: Redirects the signal caused by leakage inductance on the transformer into an RCD Tank circuit for dissipation PCB Layout: Short, fat traces have lower inductances and radiate less energy at higher frequencies Output Filter: Inline inductor and ceramic capacitor have fewer problems with higher frequencies

    10. Testing Results

    11. Constant Output Voltage

    12. Testing Results

    13. Testing Results

    14. Efficiency Test

    15. Testing Results

    16. Testing Results

    17. Output Power

    18. Testing Results

    19. Testing Results

    20. Heat Chamber

    21. Testing Results

    22. Testing Results

    23. Input Voltages

    24. Testing Results

    25. Testing Results

    26. ESD Test

    27. Testing Results

    28. Testing Results

    29. Surge Protection

    30. Testing Results

    31. Testing Results

    32. Emissions Test

    33. Testing Results

    34. Testing Results

    35. Component Cost

    36. Testing Results

    37. Testing Results

    38. Size

    39. Testing Results

    40. Special Thanks Bryan Seal (MPC Senior EE) Dr. Schulz Dr. Mazzola Dr. Donohoe Mr. Jim Gafford Mr. Evan Burnett Mr. Odie Mchann Cingular Wireless

    41. Team Slogan “I have not failed. I have found 10,000 ways that it won’t work” -Thomas Edison

    42. References M. Brown, Power Supply Cookbook, Butterworth-Heinemann, Woburn, MA, USA, 2001 B. Seal, Senior Electrical Engineer, personal communication, August 2002 R.W. Goody, Orcad pSPICE for Windows, Prentiss Hall, USA, 1997 M. Herniter, Schematic Capture with Cadence Pspice, Prentice Hall, December 2000 Dr. S. Grzybowski, Mississippi State University High Voltage Laboratory, http://www.ece.msstate.edu/hvl/geninfo.html, Dept of Electrical and Computer Engineering, Mississippi State University, MS, USA, 2002

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