The document describes a zero-voltage switching and zero-current switching full-bridge converter that utilizes the leakage inductance of a transformer. It presents the concept and methodology of the converter, which uses series resonance to achieve lossless switching. Simulation results are shown that demonstrate the switching currents achieving zero-voltage switching turn-on and zero-current switching turn-off, as intended with the design. The document also proposes a modification to the converter by incorporating a bridge rectifier at the transformer secondary.

1. Zero-Voltage- and Zero-Current-Switching with Series Resonance in FB Converter Utilizing Leakage InductancePresented by:Guided By:JoemonRaju Joseph KReg No.- 09HN026M tech PE & DDr. S Suresh Kumar(Professor and Head)Dept. of EEE22-Sep-101

2. OverviewZVS and ZCSLiteratures on ZV-ZCSBase Paper Concept & MethodologySimulationSummaryProposed ModificationReferences22-Sep-102

3. OverviewZVS and ZCSLiteratures on ZV-ZCSBase Paper Concept & MethodologySimulationSummaryProposed ModificationReferences22-Sep-103

4. Zero Voltage Switching &Zero Current Switching22-Sep-104

5. MeritsLossless switching transitionReduced EMI/RFI during switching due to transitionShort circuit tolerationReduction in switching stresses22-Sep-105

6. OverviewZVS and ZCSLiteratures on ZV-ZCSBase Paper Concept & MethodologySimulationSummaryProposed ModificationReferences 22-Sep-106

7. ZCS Circuit MethodologyFig: 1 – Converter with hard switching Auxiliary CircuitFig:2- Fully resonant auxiliary circuitReference [5]22-Sep-107

8. ZVS Circuit MethodologyFig:3 FB Converter with ZVSReference [13]22-Sep-108

9. ZV-ZCS Circuit MethodologyUsing Additional Auxillary CircuitsFig:4 FB Converter with Auxiliary Voltage SourceReference [11]22-Sep-109

10. Using Series Resonant ConvertersFig:5 HB LCL-T ResonantConverterReference [16]1022-Sep-10

11. Preference for ZV-ZCS Topologies ZCS circuits – Auxiliary circuit Conduction losses, voltage stresses in boost diodeZVS circuits – high circulating losses, high valued inductor with increase in power22-Sep-1011

12. Choice of IGBTHas lower cost considering high power and high voltage applications .ZVS realizable by adding additional lossless turn off snubber in parallel22-Sep-1012

13. OverviewZVS and ZCSLiteratures on ZV-ZCSBase Paper Concept & MethodologySimulationSummaryProposed ModificationReferences 22-Sep-1013

14. ZV-ZCS FB Converter with Secondary Resonance22-Sep-1014

15. ConceptSRC based circuitLeakage inductance of transformer participates in resonanceTurn-on of leading legs possible under all operating conditions and lossless snubber reduces their turn off lossesLagging legs can be turned on at ZV and turned off near ZC without additional aux. circuits22-Sep-1015

16. Control SignalNormal PWMPhase Shifted PWM22-Sep-1016

17. Circuit OperationMode-1im(t) = ip(t) = iT1(t) = −iT2(t) = im(t0) ...(1)22-Sep-1017

18. Mode-222-Sep-1018

19. is(t) = sin ωr(t − t1) x nVin − (Vo − Vc(t1))/Zo …(2)ωr = 2πfr = 1/√(LlkCr) …(angular resonance frequency)Zo = √(Lr/Cr) …(Characteristic Impedance)im(t) = im(t1) + (Vin/Lm) x (t − t1) ….(3)ip(t) = im(t) + nis(t) = iT1(t) = iB2(t) ....(4)22-Sep-1019

20. Mode-3is(t) = is (t2) cos ωr(t − t2) − [Vo − Vc(t2)] x sin ωr(t − t2)/Zo …(5)ip(t) = im(t) + nis (t) = −iB1(t) = iB2(t) ...(6)21-Sep-1020

21. Operation Waveformst4t5t6t1t3tot221-Sep-1021

22. Other Design FactorsFrequency Ratio: F = fr/fsQuality Factor: Q =4ωrLlk/Rotch= (CT1+CB1) x Vin/ (Ip1+ Im2max)… Charging time of Capacitance21-Sep-1022

23. OverviewZVS and ZCSLiteratures on ZV-ZCSBase Paper Concept & MethodologySimulationSummaryProposed ModificationReferences21-Sep-1023

24. Assumptions for AnalysisIdeal SwitchesRipple free Input VoltageIdeal transformer with magnetizing and leakage inductances aloneFrequency ratio, F=122-Sep-1024

25. PSIM ModelControl Signal21-Sep-1025

26. Model Parameters21-Sep-1026

27. Phase Shifted PWM Generation21-Sep-1027

28. 21-Sep-1028

29. Simulation ResultsPhase Shifted PWM Signals21-Sep-1029

30. Simulation ResultsSwitching CurrentsZVS ONZVS ONZCS OFF21-Sep-1030

31. OverviewZVS and ZCSLiteratures on ZV-ZCSBase Paper Concept & MethodologySummaryProposed ModificationReferences21-Sep-1031

32. Inference from Literatures: ZV-ZCS has upper hand in effectiveness rather than ZVS or ZCS alone

33. IGBT is preferable for high power applicationInference from Base Paper:Transformer design plays a crucial role for ZV-ZCS to avoid additional inductor 22-Sep-1032

34. OverviewZVS and ZCSLiteratures on ZV-ZCSBase Paper Concept & MethodologyMethodologySummaryProposed ModificationReferences21-Sep-1033

35. Intended ModificationRealization of the concept with Bridge rectifier at the transformer secondary.Projected Circuit Configuration21-Sep-1034

36. References Eung-Ho Kim and Bong-Hwan Kwon,” Zero-Voltage- and Zero-Current-Switching Full-Bridge Converter With Secondary Resonance”, IEEE Trans. Ind. Electron., vol. 57, no. 3, pp. 1017–1025, Mar. 2010.X. Wu, J. Zhang, X. Ye, and Z. Qian, “Analysis and derivations for a family ZVS converter based on a new active clamp ZVS cell,” IEEE Trans. Ind. Electron., vol. 55, no. 2, pp. 773–781, Feb. 2008.J. J. Lee, J. M. Kwon, E. H. Kim, and B. H. Kwon, “Dual series resonant active-clamp converter,” IEEE Trans. Ind. Electron., vol. 55, no. 2, pp. 699–710, Feb. 2008.C. M. Wang, “A novel ZCS-PWM flyback converter with a simple ZCSPWM commutation cell,” IEEE Trans. Ind. Electron., vol. 55, no. 2, pp. 749–757, Feb. 2008. X. Wu, X. Xie, C. Zhao, Z. Qian, and R. Zhao, “Low voltage and current stress ZVZCS full bridge DC–DC converter using center tapped rectifier reset,” IEEE Trans. Ind. Electron., vol. 55, no. 3, pp. 1470–1477, Mar. 2008.M. Borage, S. Tiwari, and S. Kotaiah, “LCL-T resonant converter with clamp diodes: A novel constant-current power supply with inherent constant-voltage limit,” IEEE Trans. Ind. Electron., vol. 54, no. 2, pp. 741–746, Apr. 2007.3521-Sep-10