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Presented by: Will Lockhart 12/19/03

Presented by: Will Lockhart 12/19/03. What does the Flyback Converter need from the transformer ?.  Energy Storage  Electrical Isolation  Current Limiting Inductance  Support Considerable DC Component . ac change on input  causes  Bac in core  causes  Hac

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Presented by: Will Lockhart 12/19/03

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  1. Presented by: Will Lockhart 12/19/03

  2. What does the Flyback Converter need from the transformer ?  Energy Storage  Electrical Isolation  Current Limiting Inductance  Support Considerable DC Component

  3. ac change on input  causes  Bac in core  causes  Hac DC on input  causes HDC in core  causes BDC

  4. Calculation method of transformer design has a number of approximations that must be initially made  Core Size  ‘On Time’ of Circuit  Minimum DC Input  Working Flux Density Swing

  5. Nomogram for Core Material

  6. Flux Density Saturation Vs. Temperature

  7. Start Calculating  Number of Turns on Primary  Number of Turns on Main Secondary  Readjust Earlier Approximations  Number of Turns on Any OtherSecondary

  8. Core Air Gap Affects Primary Inductance Affects Current Waveforms Affects Stress on Components Affects Flux Retention, Br Affects Working Range of Flux Density, Bac And Effect of DC generated Flux

  9. Check Saturation  By Measurement  By Calculation Bac + BDC = Bmax < Bsat

  10. Another Way to Design  PExpert

  11. A Selection of Options---------Quickly

  12. Core and Material Data is Readily Available

  13. In Conclusion  I learned that there is a lot of variation in transformer design and the transformers intended application is more critical than I realized  PExpert can be much faster for designing and trying variations  Even with fancy programming tools or cookbook recipes you still have to understand what you are doing

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