Damage Efficiency Research of PCB Components under Strong Electromagnetic Pulse

2011 ◽  
Vol 130-134 ◽  
pp. 1383-1386 ◽  
Author(s):  
Fei Xie ◽  
Bing Cao ◽  
Cheng Long Liu
Keyword(s):  
Finite Difference ◽  
Field Strength ◽  
Power Density ◽  
Time Domain ◽  
Rise Time ◽  
Finite Difference Time Domain ◽  
Electromagnetic Pulse ◽  
Magnetic Pulse ◽  
Electro Magnetic ◽  
Difference Time

To study damage effectiveness of strong electro-magnetic pulse to components of equipments, the power density in area of MOS circuit, diodes and transistor of a computer is simulated, using the method of the finite-difference time-domain (FDTD). Coupling laws in different areas are achieved, and then judging the damage efficiency of components. Electromagnetic pulse reflects constantly in computer box, causing power density appears oscillations. Energy gradually declines to zero, for it radiates outward from slots. Field concentration around PCB board results in dissociation of field strength, and slows down the attenuation of energy. Finally, formula of power density at random field strength and rise time is also obtained.

scholarly journals Finite-Difference Time-Domain Simulations

2021 ◽  
Author(s):  
Elyes Balti
Keyword(s):  
Finite Difference ◽  
Time Domain ◽  
Free Space ◽  
Finite Difference Time Domain ◽  
Electromagnetic Pulse ◽  
Analytic Solutions ◽  
Three Dimensions ◽  
Electric Conductor ◽  
Absorbing Boundaries ◽  
Difference Time

This work discusses the Finite-Difference Time-Domain (FDTD) technique to simulate an electromagnetic wave assuming one, two and three dimensions. The propagation medium is assumed to be a free space bounded by two absorbing boundaries, perfect matched layer (PML) and perfect electric conductor (PEC). The FDTD-1D is considered in free space while FDTD-2D and 3D are considered both in free space and in a free space-medium consisting of dielectric sphere and cylinder in the center. In this case, we model the incident and the scattered electromagnetic fields reflected back from hitting the dielectric cylinder and sphere. Moreover, the simulation starts by generating an electromagnetic pulse either in the middle or at one end of the medium and this pulse can be either Gaussian or sinusoidal. For the FDTD-3D, an antenna dipole is assumed to be the source generator of the electromagnetic pulse. We also provide the analytic solutions to confirm the accuracy of the FDTD technique.

Analysis on Electromagnetic Properties of Lapped Joints

2014 ◽  
Vol 940 ◽  
pp. 351-355
Author(s):  
Wen Tao Xia ◽  
Hui Li ◽  
Shi Quan Zhang
Keyword(s):  
Finite Difference ◽  
Metal Surface ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Electromagnetic Pulse ◽  
Electromagnetic Coupling ◽  
Electromagnetic Properties ◽  
Total Field ◽  
Magnetic Flows ◽  
Difference Time

There is little work on electromagnetic properties of lapped joints at the metal surface. In this paper, we improve the application of Finite-Difference Time-Domain (FDTD) to the total field border and the absorption conditions in the computed areas for electromagnetic coupling of lapped joints. The process of electromagnetic pulse penetrating into the coupling of lapped joints is simulated. Equivalent magnetic flows at the aperture of the joints are computed. Our work provides an algorithm that can be used to investigate the pattern of coupled resonance of lapped joints.

scholarly journals Finite Difference Numerical Method: Applications in Lightning Electromagnetic Pulse and Heat Diffusion

2021 ◽  
Vol 6 (3) ◽  
Author(s):  
Olufunke G Darley ◽  
Adetokunbo A Adenowo ◽  
Abayomi I Yussuff
Keyword(s):  
Finite Difference ◽  
Transmission Line ◽  
Numerical Method ◽  
Time Domain ◽  
Heat Sink ◽  
Finite Difference Time Domain ◽  
Electromagnetic Pulse ◽  
Heat Diffusion ◽  
Finite Difference Numerical Method ◽  
Difference Time

The finite difference time domain (FDTD) is a technique of the finite difference numerical method and is a simple but powerful and versatile tool that has been widely applied in many scientific and engineering problems. A typical application of the technique is in dealing with electromagnetic (EM) wave interactions with physical structures. This technique has been used to solve governing equations of various systems through obtaining numerical approximations to the time-dependent differential equations for computer simulations. This paper demonstrates the accuracy and versatility of the application of FDTD method by applying it to examine the effect of lightning electromagnetic pulse (LEMP) on a transmission line using a cross-linked polyethylene (XLPE) insulated power cable, as well as to analyze heat diffusion in a microchip heat sink made from Aluminium Alloy 6061. The effect of LEMP on a transmission line showed that the higher the values of the line parameters, the larger the voltages that will be induced on the line and that bigger values of finite difference (FD) parameters give a more accurate model subject to a stability criterion. Accurate modelling of induced voltages ensures that appropriate mitigating techniques can be deployed to reduce or eliminate the damaging effect of these on electrical and/or electronic devices/systems. Similarly, proper modeling of a heat sink provides the ability to closely estimate heat diffusion at product design stage such that a design is confirmed as workable before manufacture; thereby saving cost. Keywords—Finite Difference Method, Finite Difference Time Domain, Engineering Applications, Lightning Electromagnetic Pulse, Heat Diffusion. 

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