Energy capapacity of voltage dependent capacitor for the calculation of MOSFET´s switching losses

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 capacitor can be used to calculate switching losses of resonant switches by simply calculating the energy flow into or out of the MOSFET. Computer simulations are used to verify the validity of the formulas. 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 are negligible. Computer simulation is also used to validate the proposed switching-loss calculation technique.