A comparative simulation analysis of toroid and planar magnetic cores near MHz region

Abstract

Power supplies using high frequency magnetic materials, due to the continuous materials improvements near the MHz region, led for developing high density power supply applications. In this context, power distribution in systems that combine both power and signal PCB layout must be taken care of considering design constraints. Nevertheless, the use of either toroid or planar transformer in a high density PCB systems may amount to optimal power requirements. This article provides a comparative simulation study of the toroidal and EI magnetic cores considering that both models have the same material specifications (3F4). Although it is known that the toroid geometry leads to low flux losses it is of interest to determine the magnitude of emissions and how complex becomes maintaining the integrity of the signal lines in the vicinity of the core. Two models have been analyzed, first representing a TX36 toroid and the second one a model used in a previous work.