Download ESD generator discharged into a large ground plane

ESD generator discharged into a
large ground plane
1 / 13 CST-380-MWS_EMC+EMI-Examples.ppt
www.cst.com  May-17
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Side view of the ESD generator, the large
metal wall, and the strap
Simulator Body
Metal Wall
Strap
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.
2 / 13 CST-380-MWS_EMC+EMI-Examples.ppt
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Simulated and Measured current on the tip of the ESD
simulator for 1 KV discharge.
FI: Red, Measurement: Blue.
5
5
4
Current [A]
4
3
2
3
1
0
2
0
5
10
15
1
0
0
100
200
Time [ns]
3 / 13 CST-380-MWS_EMC+EMI-Examples.ppt
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The test enclosure used to measure the field
penetration through the slot
Cable to the
Oscilloscope
Internal
loop
ESD
simulator
Point A
Point B
Slot
Strap
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.
4 / 13 CST-380-MWS_EMC+EMI-Examples.ppt
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Induced voltage in the square loop for the first 10 ns:
FI: Red, Measurement: Blue.
Voltage [V]
2
1
0
-1
-2
0
5
10
Time [ns]
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.
5 / 13 CST-380-MWS_EMC+EMI-Examples.ppt
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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.
6 / 13 CST-380-MWS_EMC+EMI-Examples.ppt
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Induced voltage when the VCP is not terminated.
FIT simulation: Red; Measurement: Blue [1]
Voltage [V]
2
1
0
-1
0
20
40
60
80
Time [ns]
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.
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