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Synchronous Rectifier in Forward Converter - PowerPoint PPT Presentation


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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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Presentation Transcript
slide2

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
A. Rectifier Circuit

Fig1 : Forward Converter with MOSFET

Fig2 : Forward Converter with Diode

slide4

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

slide5

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
slide6

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
slide7

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
slide8

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

slide9

Schottky Power Loss

Self – Drivens SR Loss

Control – Drivens SR Loss

D. Power Loss Comparisons

slide10

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

slide12

E. Efficiency Curve

Ddead ≈ 0.2