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].
The technique of zero voltage switching is applicable to all switching topologies; the buck regulator and its derivatives (forward, half and full bridge), the flyback, and boost converters, to name a few. This presentation will focus on the continuous output current, buck derived topologies, however a list of references describ-
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