Hysteresis characteristics of electric induction and electric field in nonlinear capacitors

Summary form only given. The properties of nonlinear capacitance provoke the interest of design engineers in the area of repetitive pulse generators of high voltage nanosecond pulse width. The voltage amplification effects of ceramic capacitors are based on the reduction of capacitance value to approximately one tenth after passing a given amount of charge. To make a pulse generator using this kind of nonlinear capacitors,it is necessary to have information about the parameter changes in linear and nonlinear areas. Through this study an attempt was made to find definite characteristics of BaTiO/sub 3/ ceramic capacitors, DE1207F103Z2K manufactured by Murata Co. The rated DC capacitance and voltage of the device were 10nF and 2kV, respectively. The experimental relationships of electric induction, D = E [V/m], and electric displacement field Q/S[C/m2] versus electric field E[V/m] for the capacitors were obtained for several current values. For each current the nonlinear permittivity, changes of the capacitor in the linear and nonlinear area showed hysteresis characteristics analogous to B-H curves in magnetic materials. The experimental results showed that the use of such types of capacitor in designing repetitive nanosecond high voltage pulse generators has good prospects.