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Synchronous Rectifier in Flyback Converter - PowerPoint PPT Presentation


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Synchronous Rectifier in Flyback Converter. Rectifier Circuit Rectifier Concept Synchronous Rectifier C - 1 : Constant Frequency ( CF ) Continuous Conduction Mode ( CCM ) C - 2 : Constant Frequency ( CF ) Discontinuous Conduction Mode ( DCM )

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Presentation Transcript
slide2

Rectifier Circuit

  • Rectifier Concept
  • Synchronous Rectifier
  • C - 1 : Constant Frequency ( CF )
  • Continuous Conduction Mode ( CCM )
  • C - 2 : Constant Frequency ( CF )
  • Discontinuous Conduction Mode ( DCM )
  • C - 3 : Variable Frequency ( VF )
  • Discontinuous Conduction Mode ( DCM )
  • C - 4 : Variable Frequency ( VF )
  • Zero-Voltage-Switched ( ZVS )
  • Discontinuous Conduction Mode ( DCM )
  • D. Power Loss Comparisons
  • E. Efficiency Curve
a rectifier circuit
A. Rectifier Circuit

Fig2 : Flyback Converter with Diode

Fig1 : Flyback Converter with MOSFET

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 : Constant Frequency ( CF ) Continuous Conduction Mode ( CCM )

slide6

C. Synchronous Rectifier

C - 2 : Constant Frequency ( CF ) Discontinuous Conduction Mode ( DCM )

slide7

C. Synchronous Rectifier

C - 3 : Variable Frequency ( VF ) Discontinuous Conduction Mode ( DCM )

slide8

C. Synchronous Rectifier

C - 4 : Variable Frequency ( VF ) Zero-Voltage-Switched ( ZVS )

Discontinuous Conduction Mode ( DCM )