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6.3.2. Forward converter - University of Colorado Colorado ...

fundamentals of power ElectronicsChapter 6: converter Forward converter Buck-derived transformer-isolated converter Single-transistor and two-transistor versions Maximum duty cycle is limited Transformer is reset while transistor is off+ D1Q1n1 : n2 : n3CR+V LD2D3 VgFundamentals of power ElectronicsChapter 6: converter circuits45 Forward converterwith transformer equivalent circuit+ D1Q1n1 : n2 : n3CR+V LD2D3 VgLMiMi1'i1i2i3+v1 +vD3 +v3 +vQ1 v2+ fundamentals of power ElectronicsChapter 6: converter circuits46 Forward converter : waveforms Magnetizing current, inconjunction with diode D1,operates in discontinuousconduction mode Output filter inductor, inconjunction with diode D3,may operate in eitherCCM or DCMv1iMvD3tVg n1n2Vg0 VgLM n1n2 VgLM000n3n1 VgDTsD2 TsD3 TsTsQ1D2D1D3D3 Conductingdevices: fundamentals of power ElectronicsChapter 6: converter circuits47 Subinterval 1: transistor conducts+ D1 offQ1 onn1 : n2 : n3CR+V LD2 onVgLMiMi1'i1i2i3+v1 +vD3 +v3 v2+ fundamentals of power ElectronicsChapter 6: converter circuits48 Sub

Fundamentals of Power Electronics Chapter 6: Converter circuits54 Maximum duty cycle vs. transistor voltage stress Maximum duty cycle limited to which can be increased by increasing the turns ratio n2 / n1. But this increases the peak transistor voltage: For n1 …

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Transcription of 6.3.2. Forward converter - University of Colorado Colorado ...

1 fundamentals of power ElectronicsChapter 6: converter Forward converter Buck-derived transformer-isolated converter Single-transistor and two-transistor versions Maximum duty cycle is limited Transformer is reset while transistor is off+ D1Q1n1 : n2 : n3CR+V LD2D3 VgFundamentals of power ElectronicsChapter 6: converter circuits45 Forward converterwith transformer equivalent circuit+ D1Q1n1 : n2 : n3CR+V LD2D3 VgLMiMi1'i1i2i3+v1 +vD3 +v3 +vQ1 v2+ fundamentals of power ElectronicsChapter 6: converter circuits46 Forward converter : waveforms Magnetizing current, inconjunction with diode D1,operates in discontinuousconduction mode Output filter inductor, inconjunction with diode D3,may operate in eitherCCM or DCMv1iMvD3tVg n1n2Vg0 VgLM n1n2 VgLM000n3n1 VgDTsD2 TsD3 TsTsQ1D2D1D3D3 Conductingdevices: fundamentals of power ElectronicsChapter 6: converter circuits47 Subinterval 1: transistor conducts+ D1 offQ1 onn1 : n2 : n3CR+V LD2 onVgLMiMi1'i1i2i3+v1 +vD3 +v3 v2+ fundamentals of power ElectronicsChapter 6: converter circuits48 Subinterval 2: transformer reset+ D1 onQ1 offn1 : n2 : n3CR+V LD3 onVgLMiMi1'i1i2 = iM n1 /n2i3+v1 +vD3 +v3 v2+ fundamentals of power ElectronicsChapter 6.

2 converter circuits49 Subinterval 3+ D1 offQ1 offn1 : n2 : n3CR+V LD3 onVgLMi1'i1i2i3+v1 +vD3 +v3 v2+iM= 0 fundamentals of power ElectronicsChapter 6: converter circuits50 Magnetizing inductance volt-second balancev1iMVg n1n2Vg0 VgLM n1n2 VgLM0v1=DVg+D2 Vgn1/n2+D30=0 fundamentals of power ElectronicsChapter 6: converter circuits51 Transformer resetFrom magnetizing current volt-second balance:Solve for D2:D3 cannot be negative. But D3 = 1 D D2. HenceSolve for Dfor n1 = n2:v1=DVg+D2 Vgn1/n2+D30=0D2=n2n1DD3=1 D D2 0D3=1 D1+n2n1 0D 11+n2n1D 12 fundamentals of power ElectronicsChapter 6: converter circuits52 What happens when D > currentwaveforms,for n1 = n2D < > (t)DTsD2 TsD3 TstiM(t)DTsD2 Tst2 TsFundamentals of power ElectronicsChapter 6: converter circuits53 Conversion ratio M(D): n3CR+V LD2D3vD3t00n3n1 VgDTsD2 TsD3 TsTsQ1D2D1D3D3 Conductingdevices:vD3=V=n3n1 DVgFundamentals of power ElectronicsChapter 6: converter circuits54 Maximum duty cycle vs.

3 Transistor voltage stressMaximum duty cycle limited towhich can be increased by increasing the turns ratio n2 / n1. But thisincreases the peak transistor voltage:For n1 = n2andD 11+n2n1maxvQ1=Vg1+n1n2D 12max(vQ1) = 2 VgFundamentals of power ElectronicsChapter 6: converter circuits55 The two-transistor Forward converter + D1Q11 : nCR+V LD2D3 VgQ2D4D 12max(vQ1) = max(vQ2) = VgV = nDVg

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