Noise analysis designing method

Abstract

To provide a simulation technology of ending multiphysics analysis on heat, vibration, and EMC within a practical time and with a low-price computation process at an early stage of product designing, in a noise analysis designing method for an electric device, such as an inverter for automobile, this electric device includes one or more energy sources, a propagation path through which energy from the energy source propagates, and a noise occurring part where an electromagnetic radiated noise occurs due to the energy coming from the propagation path, the method has a step of estimating the occurring noise, such as a occurring radiated noise, by analyzing a path specified by a user by using a calculator, and the path specified by the user is a path of the energy flowing through the propagation path.

1 . A noise analysis designing method for an electric device, the method comprising the steps of:
 dividing a major path of specified electric energy in the electric device into parts;   classifying each of the parts into elements;   creating an equivalent circuit of each of the parts based on the classifications of each of the parts;   creating a circuit constant database by calculating circuit constants of the equivalent circuits of each of the parts; and   calculating an electric field intensity of radiated noise based on input information of the electric device and the circuit constant database, wherein:   the steps are performed by a processor, and   the parts of the major path of specified electric energy include a path to be coupled by a capacitive coupling or inductive coupling between parts that are not connected by a conductor.   
     
     
         2 . The noise analysis designing method according to  claim 1 ,
 further comprising a step of creating a template of an equivalent circuit of the electric device by combining the equivalent circuits of each of the parts,   wherein the step of creating the circuit constant database further comprises calculating a circuit constant of the template of the equivalent circuit of the electric device.   
     
     
         3 . The noise analysis designing method according to  claim 1 , wherein
 the elements include a noise source, a propagation path, and an antenna.   
     
     
         4 . The noise analysis designing method according to  claim 2 ,
 wherein the elements include a noise source, a propagation path, and an antenna.