Abstract

Energy capacity of a voltage-dependent capacitor is investigated and defined. An equation for the calculation of energy capacity of the MOSFET's parasitic capacitance is formulated. The defined energy capacity of a voltage-dependent capacitance can be used to calculate switching loss of resonant switches by simply calculating the energy transferred into or retrieved from the MOSFET. The validity of the proposed formula is verified by computer simulation. The discrepancy between energy capacity of the MOSFET's parasitic capacitance calculated from the formulated equation and that calculated from the results of computer simulation is negligible. Computer simulation is also used to validate the proposed switching-loss calculation technique.

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