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April/May 2023


Powerful Filter Simulation with SPICE


By Herbert Blum, Product Manager, SCHURTER AG


as good as the data available for it. SCHURTER therefore offers sophisticated simulation models for a large number of its single- and three-phase common mode chokes. Circuit simulation is a key


T


element for electronics design and can be performed using various computer-based tools. One that has been proven for this purpose for many decades is SPICE (Simulation Program with Integrated Circuit Emphasis), which was first introduced at the University of California in 1973. This program has been fur-


ther developed over decades and is now an established and widely used program that calculates algo- rithmic approximations for analog, digital and mixed electrical circuits.


Common mode choke for vertical PCB mounting.


Close to Reality A SPICE simulation model is a virtual


description of the physical behavior of an


  


 


  


 


of the element under testing. To achieve this goal, the simulation must account for various parasitic effects in addition to the nominal behavior. This requires advanced models and thus


oday, a successful circuit design is almost always preceded by a simula- tion. However, any simulation is only


electrical component or assembly. The goal of modeling is to provide a picture as accurate as possible of the actual functional behavior


more accurate simulation results than those obtained with an oversimplified “image” of the component.


SPICE models, now available


as libraries, refer to some of the latest SCHURTER single-phase and three-phase common mode choke families. These include for example the


ferrite chokes of the types DKIH-1, DKIV-1 and DKIH-3. They can be easily imported into a standard SPICE simulation program, and their simulated common-mode (CM) impedance can be compared to the choke’s real CM impedance, which is specified on the product data sheet. This is done over the entire


specified frequency range (from 10 kHz to 10 MHz) and under stan- dard conditions (line/load imped- ance of 50W). The following para- graphs provide details on choke


model development and model validation, as well as an example of how they can be used in a real circuit of a more complex system simulated with LTSpice.


Continued on page 65


 


 


 


 


  


    


      


Humidity for a beer life See at SMTconnect, Hall 4A Booth 337 


   


   


  


  


  


 WWW.KYOCERA-AVX.COM See at PCIM, Hall 6 Booth 342 and at EDS


ULTRA-BROADBAND CAPACITORS


For Reliable, Repeatable Performance


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