Calculation of low frequency EMC problems in large systems with a quasi-static approach

Low frequency problems in automobiles and other systems can be calculated with quasi-static approaches. Such approaches can be valid for frequencies up to 10 MHz in automobiles. The method presented is based on calculation of mutual and self capacitances as well as inductances of all important objects. An equivalent lumped circuit is constructed based on the resulting L- and C-matrices. The paper presents a new solver for the calculation of mutual and self capacitances and inductances of arbitrary three dimensional objects. It is shown how typical low frequency problems can be solved. The accuracy of the method is proved by comparison with the direct method of moments (MoM) solution and with measurements.