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Understanding T1 Currents in Sync Rectification: A Step-by-Step Guide

This guide explores the intricacies of T1 currents in sync rectification across various intervals. We break down energy flow during different states of QA, QB, QC, QD, QE, and QF, highlighting how current is delivered from the primary and the conduction roles of body diodes. You'll gain insights into common misconceptions, particularly regarding current splitting during short circuits. This comprehensive overview aims to enhance understanding of switching behaviors and energy transfer in sync rectifiers.

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Understanding T1 Currents in Sync Rectification: A Step-by-Step Guide

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Presentation Transcript

  1. How does it work with Sync Rec?

  2. Understanding T1 Currents • Interval 1 • QA, QD, QF on • QB, QC, QE are off • Energy delivered from primary -dILOUT/2

  3. Understanding T1 Currents • Between Interval 1 and 2 • QD turns off and QDd LC Tanks • QC’s body diode will conduct -dILOUT/2

  4. Understanding T1 Currents • Interval 2 • QC and QE turn on • QC body diode stops conducting -dILOUT/2

  5. Misconception • Interval 2 • Misconception • QE and QF equally split current • When T1 Primary Shorted by QA and QC • Turns ratio forces most of I through QF • ΔILOUT is forced/divided through both windings -dILOUT/2

  6. Understanding T1 Currents • Between Interval 2 and 3 • QA and QF turn off and QBd LC Tanks • QB’s body diode will conduct

  7. Understanding T1 Currents • Interval 3 • QB turns on • Energy delivered from primary • QB’s body diode stops conducting

  8. Understanding T1 Currents • Between Interval 3 and 4 • QC turns off and QDd LC Tanks • QD’s body diode will conduct

  9. Understanding T1 Currents • Interval 4 • QD and QF turn on • QD body diode stops conducting

  10. Understanding T1 Currents • Between Interval 4 and 1 • QB turns off and QBd LC Tanks • QA’s body diode will conduct • The cycle will start all over again

  11. Actual T1 Currents From EVM

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