Algumas considerações sobre transformadores de alta frequência (MHZ) com aplicações em eletrônica de potência.

Abstract

Currently, there is a continuous demand to design fast dynamic response, compact, high power density, high efficiency and high switching frequency converters at a reasonable price for many portable devices, such as notebook adapters, smartphones, etc. Efforts focused on the efficiency of HEMTs (High Electron Mobility Transistor) switches semiconductor devices such as Power MOSFET, SiC, GaN leads an increasing in the switching frequencies of power semiconductor devices. Along with this increase in switching frequency of these devices, there are several issues with which power electronics occasionally had to face. One of these issues is the losses by conduction in the electrical circuit and magnetic circuit of the transformers and inductors in switched converters that operates with a high frequency. This work concentrates on presenting the important questions about conduction losses and losses in the magnetic material due to the increase of switching frequency, all based on the vast bibliography in annex.