High Frequency Behavior of High Power IGBT Modules

Abstract

Sharp voltage gradients act as a stimulus for high power IGBT modules, which can exhibit a potentially instable high frequency behaviour. In effect, they can act as a radio frequency (RF) amplifier and under certain operating conditions the interaction between the device and the control or the external circuit can cause self-sustaining oscillations or the enhancement of the unevenness in current distribution inside a power module and that can have a significant impact on the reliability of the power converter. Moreover, this RF amplification worsen the generated EMI (Electro Magnetic Interference). This paper presents an extensive experimental investigation about the high frequency behaviour of IGBT high power modules. Measurements were performed by an original experimental set-up that was specifically conceived and constructed. Data were analysed with the help of a theoretical small signal model which was able to describe RF behaviour of high power IGBT modules.