1  Jan-16 BACKSlide 1 / 13 CST-380-MWS_EMC+EMI-Examples.ppt ESD generator discharged into a large ground plane

2  Jan-16 BACKSlide 1 / 13 CST-380-MWS_EMC+EMI-Examples.ppt Side view of the ESD generator, the large metal wall, and the strap Metal Wall Strap Simulator Body ESD generator discharged into a large ground plane. In order to verify the ESD generator model, the discharge into a large ground plane was simulated. The current injected from the ESD generator into a large metal wall was measured, and the generator was numerically modeled as in this figure. The geometry of the ESD generator was optimized for obtaining a good match to the measurement, while keeping it as simple as possible.

3  Jan-16 BACKSlide 1 / 13 CST-380-MWS_EMC+EMI-Examples.ppt Simulated and Measured current on the tip of the ESD simulator for 1 KV discharge. FI: Red, Measurement: Blue.

4  Jan-16 BACKSlide 1 / 13 CST-380-MWS_EMC+EMI-Examples.ppt The test enclosure used to measure the field penetration through the slot Internal loop Slot Strap ESD simulator Cable to the Oscilloscope Point A Point B The enclosure used for the tests and the set up used for the measurements were the same as in Graziano Cerri, Roberto De Leo, Roberto De Rentiis, Valter Mariani Primiani. “ESD Field Penetration Through Slots into Shielded Enclosures: A time Domain Approach”. IEEE Trans. on EMC, Vol. 39, NO. 4, November 1997.

5  Jan-16 BACKSlide 1 / 13 CST-380-MWS_EMC+EMI-Examples.ppt Induced voltage in the square loop for the first 10 ns: FI: Red, Measurement: Blue. The electromagnetic field due to the ESD current between the points A and B excites the enclosure. The square loop placed into the cavity senses the internal electromagnetic field and is then used to compare numerical and experimental values.

6  Jan-16 BACKSlide 1 / 13 CST-380-MWS_EMC+EMI-Examples.ppt Typical test setup for discharges to the VCP. The proposed model of the ESD generator was tested on the horizontal coupling plane (HCP) and the vertical coupling plane (VCP). We study the coupling with a mouse cable, which was added parallel to the VCP as a susceptible circuit using quasi-static approximations and transmission line theory.

7  Jan-16 BACKSlide 1 / 13 CST-380-MWS_EMC+EMI-Examples.ppt Induced voltage when the VCP is not terminated. FIT simulation: Red; Measurement: Blue [1] Using the simplified model of the ESD generator, the voltage induced on the mouse cable was simulated, and the results were compared with the results obtained in [1] David J. Pommerenke, Thomas P. Van Doren, Wang Kai, ‘ESD Currents and Fields on the VCP and the HCP Modeled Using Quasi-static Approximations’, IEEE Int. Sym. EMC, Minneapolis, Minnesota, 2002.