Transcription of Zero Voltage Switching - TI.com
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Zero Voltage Switching - TI.com
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. For the most part, it canbe considered as square wave power utilizing aconstant off-time control which varies theconversion frequency, or on-time to maintainregulation of the output Voltage .
Zero Voltage Switching Resonant Power Conversion Bill Andreycak ing zero current, hence zero power switching. And while true, two obvious concerns can
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