Kulkarni, Shounak Shashishekhar

The conducted electromagnetic interference (EMI) caused by a DC-DC power converter interfacing an automotive electric battery and the 48 V board grid can eventually affect the operation of the battery management system at the battery side of an electric vehicle or could transfer emissions to the board grid, where the conducted and radiated EMI originating from the converters could influence the signal electronics of automotive components. This work takes into account hardware setups of two different converter topologies: a phase-shifted full-bridge (PSFB) and a two-phase interleaved buck (TPIB) converter, both for up to 3 kW power and 400 V to 48 V voltage conversion. An analysis of the conducted and radiated emissions for half-load and full-load conditions is performed in buck operation mode. The results indicate the TPIB-topology having higher radiated emissions, higher differential mode emissions, but lower common mode emissions than the PSFB-topology.

Maintaining compliance to electromagnetic compatibility (EMC) standards becomes an increasing challenge for the automotive industry in the course of the ongoing automation of vehicles. Novel extended design procedures and test standards are required to ensure safety of automated driving functions, particularly in an adverse electromagnetic (EM) environment. In order to keep the number of tests within a reasonable and practical limit, an evaluation framework based on virtual design methods and information drawn from legacy experiments and simulations can support the automotive industry. With this digital framework appropriate technological solutions can be identified during the pre-compliance phase and efficient experimental designs can be generated to ensure EMC compliance. Furthermore, such a framework paves the way for digital EMC twins of automated vehicles (AVs) considering the complex interrelations of AV’s (sub-)systems to accurately predict the behaviour of new AV functions in various EM environments. To this purpose, a cross-domain platform is being developed in this work as the backbone of such a virtual framework. It supports the handling, storage and processing of various datasets from EMC test campaigns, including (intentional) electromagnetic interference ((I)EMI) tests, as well as simulations of automotive devices-under-test (DUTs). The platform allows for the establishment of interconnections between various data sources and deeper analyses based on artificial intelligence (AI) methods to deduce EMC information for new developments, whilst maintaining traceability.

Wide band gap semiconductors such as siliconcarbide (SiC)-based devices are favored in the power electronic industry for their reduced switching losses. However, their utilization leads to high d𝑉₍DS₎/d𝑡, causing high-frequency emissions that can affect the operation of connected devices and systems on the board net. This study investigates conducted emissions originating from the output lines of a laboratory adaptation of an automotive interleaved buck converter, interfacing the traction battery of an electric vehicle with 48 V board net, along with monitoring the chip temperature of the SiC MOSFET. Across various combinations of input and output characteristics and operation modes, differences in common and differential mode emission spectra and their comparison with CISPR-25 standard limits, are observed. A study is further done to analyze these experimental results.