1 / 13

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

ossie
Télécharger la présentation

Presented by: Will Lockhart 12/19/03

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related