MINIMIZATION OF THE SELF INDUCTANCE OF ME TALLIZED CAPACITORS

In this article, we examine the different factors responsible for the equivalent series inductance in metallized capacitors and we propose s tructures for capacitors that reduce this inductance. After recalling the structure of metallized capacitors we compare, by experimental mea surements, the inductance due to the winding and that one added by the connections. The latter can become preponderant. In order to explain the experimental evolution of the winding impedance vs. frequency, we describe an analytical model which gives the current density in the wi nding and its impedance. This model enables us to determine the self r esonant frequency for different types of capacitors. From where, we ca n infer the influence of the height of capacitors and their internal a nd external radius upon performances. It appears that to reduce the eq uivalent series inductance, it is better to use hat windings and annul ar windings.