OPTIMUM PARAMETERS OF METAL-FILM CAPACITORS ELECTRODES FOR POWER ELECTRONICS

The aim of the study is to reveal the influence of the electrode configuration of metal-film capacitors on their characteristics in order to further develop approaches to the optimal choice of electrode parameters. We showed the influence of the capacitor electrodes on its performance under the conditions typical for power electronics conditions and experimentally studied the effect of the sprayed electrode thickness on the breakdown strength. The effects from the fracture of sprayed electrodes caused by electrical discharges occurring during self-healing of metal-film capacitors are demonstrated. Authors propose a new type of electrode for metal-film capacitors called hybrid. Comparative calculations of the surface resistance and active area of segmented and hybrid electrodes showed the advantage of the latter. We experimentally established that at comparable process durations the deposited energy for the fracture of hybrid electrodes was less than for segmented ones.