Martin Aidam

HEV system EMC investigation during transient operations

EMC challenges for hybrid electric vehicles have been published and shown to have dependencies on high slew rates coupled with parasitic impedances from electric machines, high voltage cables, heat sinks, circuit layout considerations, and the alike. Although the steady state operation of power converters creates apparent EMC disturbances, it doesn’t always create a worst case scenario. Transient operation of the system, such as load torque and speed gradients, can cause additional disturbances that are rarely covered and become difficult to analyze. This paper covers these transient operational issues evaluating them in time, frequency, and time-frequency domain.

The benefit of characteristic transfer functions in automotive EMC

This paper deals with the possibilities provided by characteristic transfer functions to estimate a vehiclepsilas EMC-performance. The steadily rising number of electric and electronic components in a vehicle is a challenge to the EMC in the whole vehiclepsilas development process. Characteristic transfer functions allow an early estimation of both, emission and susceptibility performance of a vehicle.

Estimation of electromagnetic coupling phenomena in a vehicle wiring harness using characteristic transfer functions

The rising number of electronic and electric systems in a modern vehicle makes automotive EMC more and more important. Due to steadily decreasing development cycles, EMCMeasurements of the whole vehicle are only possible in a relative late state of the development time. By means of measuring transfer functions in a vehicle, one can categorise different places of installation in face of their possible disturbance behaviour. The comparison of different transfer functions of vehicles can help to estimate the potential disturbance risk e.g. to the build-in radio-, TV- or mobile phone antenna.

Measurement of transient pulses on high-voltage automotive power networks

Due to the high number of electronic devices and components in limited space, the Electromagnetic Compatibility (EMC) is an important issue in motor vehicles. In modern electrically powered cars high power has to be transmitted over the vehicles electrical power system. This leads to enhanced requirements for the EMC as well as new methods for characterization of Electromagnetic Interferences (EMI) are necessary. In this contribution a measuring system is described which can be used to measure transient voltage and current pulses on high-voltage (HV) power networks in normal driving conditions. The devices of the system are tested of its electrical characteristics and some measuring examples conduced at a hybrid car are shown.