A generalized accurate modelling method for automotive bulk current injection (BCI) test setups up to 1 GHz

Abstract

Development of accurate system models of immunity test setups might be extremely time consuming or even impossible. Here a new generalized approach to develop accurate component-based models of different system-level EMC test setups is proposed on the example of a BCI test setup. An equivalent circuit modelling of the components in LF range is combined with measurement-based macromodelling in HF range. The developed models show high accuracy up to 1 GHz. The issues of floating PCB configurations and incorporation of low frequency behaviour could be solved. Both frequency and timedomain simulations are possible. Arbitrary system configurations can be assembled quickly using the proposed component models. Any kind of system simulation like parametric variation and worst-case analysis can be performed with high accuracy.

Experimental validation of the generalized accurate modelling method for system-level bulk current injection setups up to 1 GHz

“…The EMC capacitors are present at both supply and output pins (C 1 and C 3 ). An alternative capacitor location C 2 at supply pin allows increasing the ESL from 1.5 to 4.5 nH for analysis purposes.…”

“…The current work extends the test setup and model from [3] with a demonstrator EUT module. The floating ground plane modelling concept proposed in [18] and successfully verified in [3] is applied to the EUT board.…”

“…The floating ground plane modelling concept proposed in [18] and successfully verified in [3] is applied to the EUT board. The groundless differential monitoring concept using an optically-decoupled high-ohmic voltage probe and its effect on the result is discussed.…”

“…A generalized accurate modelling method for automotive bulk current injection test setups valid up to at least 1 GHz was shown in [3]. The system-level BCI setup model is assembled on a modular basis.…”

“…The work [3] also proposes a combined macromodelling approach with LF equivalent-circuit-based extension of the measurement-based HF S-parameter data, by which the known issues of VectFit-based macromodels [17] are avoided. The transfer function (S mn ) from the RF port of the injection clamp to differential port at a passive RC load located at floating EUT board is reproduced with high accuracy up to 1 GHz.…”