Technique for embedding current measurement and ringing suppression within multichip modules

Abstract

This paper introduces a technique for adding two complementary features to power electronics circuits based on multi-chip power modules: high-bandwidth current measurement and ringing suppression. The design of the “CT-snubber” device, which can be viewed as an extension of the traditional current transformer, incorporates an additional filter network which can be tuned to mitigate the undesirable parasitic-induced ringing of the type commonly observed in wide band-gap applications during high-edge-rate switching transients. Preliminary empirical results from a prototype CT-snubber designed as part of this effort indicate that this concept is viable both as a current measurement apparatus, as well as a means for improving the transient response of power electronics applications. Further, it is believed that this type of circuit could be readily integrated into the housing of multi-chip modules, thereby simultaneously realizing improved dynamic performance and in-situ current sensing suitable for application control.