Leakage current suppression in the variable capacitance device for the use in AC power converters

Ac leakage current in the Variable Capacitance Device is discussed. For varying the capacitance, this device utilizes nonlinear characteristics of dielectric. Therefore, the ac leakage current flows from the capacitor to a dc control voltage source when ac capacitor voltage is high. Here, techniques for suppressing ac leakage current are proposed. An example of its application is introduced about ac power supply. Influence of leakage current on distortion in current waveforms is also investigated.