Switched capacitor discrete control ofvoltage dividing class E amplifier to achieve sub nominal operation

In this paper, we present the class E amplifier connecting the transistors in series, and some of connected transistors in series are constantly kept active, and rests are periodically controlled. In the proposed method, peak switch voltage of class E amplifier is reduced lower than conventional because shunt capacitance voltage is divided by connecting the transistors in series. Thus, peak switch voltage of the class E amplifier is able to divide depending on the number of transistors. As a conventional study, there is a method to perform of maintain the nominal operation by controlling shunt capacitance and resonant capacitance in the class E amplifier when the load changes. For the reason, the sub nominal operation can be maintained when the load changes because the shunt capacitance can be controlled some of connected transistors in series are constantly kept active, rests are periodically controlled because it is possible to control the number of driving transistors.