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.
voltage across the output inductor V Lo equals the input to output voltage differential; V Lo = VlN -Vo .The output filter section catch diode Do is not conducting and sees a reverse voltage equal to the input voltage; V Do = Vl, observing the polarity shown in Figure 4. Table I. INITIAL CONDITIONS COMP. STATUS 01 ON Do OFF LA Lo
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