| Abstract |
A semi co-axial transformer concept is described which can be used to transfer energy across a relativelyhigh potential difference without using potting components. The intended purpose of the design is to pro-vide electrically insulated power for heating up the semiconductor devices in a double-pulse test circuitoperating at several kilovolts. Because of the requirement of handling the large potential difference, alarge leakage inductance is anticipated and the LLC topology is used to solve the issue of excessive volt-age drop. The transformer is implemented using ring cores and a primary winding which is led throughthe center inside a shielding tube which in turn has several millimetres of insulation on the outside. Apartfrom the aspects of insulation, this work deals with the choice of core material, wire thickness and type,determining the transformer properties, including the magnetic and electrical losses. Distinctive featuresin the design are the configuration which approaches some of the properties of a coaxial configurationand the inclusion of a thick metallic shield. Results show that a good prediction of the performance canbe achieved using relatively simple techniques. |
