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In order to design noiseless electromagnetic (EM) devices, it is necessary to clarify the mechanism behind EM noise and theoretical calculations and computer simulations are performed for prediction assessment of devices. Two researchers at Osaka University developed an algorithm for numerical calculation of EM noise (interference) in electric circuits.
EM noise is a problem that has proven to be difficult to solve. Caused by interference from transmission lines and connecting parts, various approaches have been taken to reduce it, such as adding filters and/or passive devices to circuits or using the symmetry of the configuration.
Algorithm - Study - Computer - Simulation - Circuits
The algorithm developed in this study is for computer simulation of electric circuits in which transmission lines are connected with lumped element models. Usually, the solution of problems along a transmission line is performed using partial differential equations, while the solution of problems in a lumped constant circuit uses ordinary differential equations. In order to connect these two different differential equations and solve these problems, the pair of researchers, Prof. Masayuki Abe and Prof. Hiroshi Toki, introduced the incidence matrix found in circuit theory and time domain impedance, the latter of which is a new concept.
Previously, this solution required a method to replace lumped constant circuits with transmission lines, but this new method does not require such a replacement, allowing for more practical calculations. The results of this research were published in Scientific Reports.
Results - Calculations - Algorithm - Researchers - EM
Based on the results of calculations using this algorithm, the two researchers demonstrated that EM noise could be reduced by using the symmetric...
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