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Synchronous Rectifier in Forward Converter

Synchronous Rectifier in Forward Converter. Rectifier Circuit Rectifier Concept Synchronous Rectifier C -1 : RCD Clamp & Self - Driven SRs C -2 : Active Clamp & Self - Driven SRs C -3 : Control – Driven D. Power Loss Comparisons E. Efficiency Curve. A. Rectifier Circuit.

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Synchronous Rectifier in Forward Converter

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  1. Synchronous RectifierinForward Converter

  2. Rectifier Circuit • Rectifier Concept • Synchronous Rectifier • C -1 : RCD Clamp & Self - Driven SRs • C -2 : Active Clamp & Self - Driven SRs • C -3 : Control – Driven • D. Power Loss Comparisons • E. Efficiency Curve

  3. A. Rectifier Circuit Fig1 : Forward Converter with MOSFET Fig2 : Forward Converter with Diode

  4. B. Rectifier Concept The switching losses caused by the reverse recovery current of the body - diode will be dependent of the carried current in the instant in the which the voltage between anode and cathode reverses become negative

  5. C. Synchronous Rectifier C-1 RCD Clamp & Self – Driven SRs • Gate –Driver signal • Drain to Source voltage of primary switch • Secondary winding voltage • Current through SR2 • Current through SR3

  6. C. Synchronous Rectifier C-2 Active Clamp & Self – Driven SRs • Gate –Driver signal • Drain to Source voltage of primary switch • Secondary winding voltage • Current through SR2 • Current through SR3

  7. C. Synchronous Rectifier C-3 Control – Driven SRs • Gate –Driver signal • Drain to Source voltage of primary switch • Secondary winding voltage • Current through SR2 • Current through SR3

  8. Converter efficiency Converter Efficiency ( For Schottky Rectifiers ) Converter Efficiency ( For Synchronous Rectifiers ) D. Power Loss Comparisons PO : Output Power Ploss : Total Loss ; PSH : Schottky Rectifiers Loss PSR : Synchronous Rectifiers Loss

  9. Schottky Power Loss Self – Drivens SR Loss Control – Drivens SR Loss D. Power Loss Comparisons

  10. Efficiency ( RCD Self –Driven SRs) D. Power Loss Comparisons Efficiency ( Active Self –Driven SRs) Efficiency ( Control –Driven SRs) VD = VSH = Body Diode Voltage ; Ddead = dead time duty cycle ; Ddelay = delay time duty cycle

  11. E. Efficiency Curve Ddelay ≈ 0

  12. E. Efficiency Curve Ddead ≈ 0.2

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