ECEN5817 Lecture 35Analysis of ZVS-QSW switch cell(1titbidi i l i di d )(1-transistor case: current-bidirectional transistor + diode)i2(t)DLV1Lr–V2LrD1Q1+i1(t) i2(t)+LrL+Iv2(t)V10+–CrVgD2Q1v2(t)–v1(t)–CRV–V1V1_0Ts0tConductingdevices:D2XXQ1D1ECEN 58171Single-transistor ZVS-QSW waveforms and state-plane analysismc+V+VL+i1iLD1DQ1jloTs12345V1_V_Cvc_D2jlotjlmcotECEN 58172 Devices conductingInterval 1: Q1conduction++L+i1iLD1Q1V1_V_Cvc_D2ECEN 58173Interval 2: transition++L+i1iLD1Q1V1_V_Cvc_D2ECEN 58174Interval 3: D2conduction++L+i1iLD1Q1V1_V_Cvc_D2ECEN 58175Interval 4: transition++L+i1iLD1Q1V1_V_Cvc_D2ECEN 58176Interval 5: D1conduction++L+i1iLD1Q1V1_V_Cvc_D2ECEN 58177Average output currentECEN 58178Control input: transistor/diode conduction angle ECEN 58179A way to solve and plot the characteristicsECEN 581710Solving, p 2ECEN 581711Results: output-plane characteristic of the switch conversion ratio µ with F as the parameterECEN 581712Output-plane characteristic of the switch conversion ratio µ with as the parameterCourse website contains Excel spreadsheet (with function macros) that evaluates the above equations and can plot the above characteristic.ECEN 581713Summary of 1-transistor ZVS-QSW characteristicsµvs Fµ vs. FECEN 581714Boundaries of ZVS operationmmmcmcjjjljlECEN
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