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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
- 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
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
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
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
C-3 Control – Driven SRs
- Gate –Driver signal
- Drain to Source voltage of primary switch
- Secondary winding voltage
- Current through SR2
- Current through SR3
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
( 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
Ddelay ≈ 0
Ddead ≈ 0.2
