Transcription of Zero Voltage Switching - Texas Instruments
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Zero Voltage Switching - Texas Instruments
zero Voltage SwitchingResonant Power ConversionBill Andreycaking zero current, hence zero power while true, two obvious concerns canin1pede the quest for high efficiency operationwith high Voltage nature of the resonant tank and zerocurrent Switching limitation, the peak switchcurrent is significantly higher than its squarewave counterpart. In fact, the peak of the fullload switch current is a minimum of twice thatof its square wave kin. In its off state, theswitch returns to a blocking a high voltageevery cycle. When activated by the next drivepulse, the MOSFET output capacitance ( Coss)is discharged by the FET, contributing a signifi-cant power loss at high frequencies and highvoltages. Instead, both of these losses areavoided by implementing a zero Voltage switch-ing technique [9,10]. zero Voltage Switching OverviewZero Voltage Switching can best be definedas conventional square wave power conversionduring the switch's on-time with "resonant" Switching transitions.
output current Io, and VDs = VCR = O (ideal). In series with the switch Ql is the resonant inductor LR and the output inductor Lo which also conduct the output current Io .It has been established that the output inductance Lo is large in comparison to the resonant inductor LR and all components are ideal. Therefore, the
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