White Paper SPICE library schurter.com/downloads Just like the real thing! SPICE library for current-compensated and linear chokes An efficient circuit design requires advance simulations. But, each simulation is only as good as the data used at the start. SCHURTER provides sophisticated simulation models for many of its chokes. Circuit simulation is an important part of the circuit design and can be simplified with the use of many computer-based tools. A proven tool for this is SPICE (Simulation Program with Integrated Circuit Emphasis). SPICE was first presented in 1973 at the University of California. This program has been further developed over the past 40 years and is now a perfected and widely used program, which is available in different versions and different suppliers. SPICE calculates algorithmic approximated solutions for analog, digital and mixed circuits. The individual simulation components are based on the physical model descriptions or also on abstract formulated functions. These component models are subsequently mapped out as a network list and calculated using a multitude of different equations. As realistic as possible The aim of the simulation is to provide as accurate a picture as possible of the actual real functional behavior. In order to achieve this, the components must take into account, for example, parasitic parts or thermally induced reductions, which correspondingly requires more complex simulation models of the individual components and therefore leads to more accurate simulation results. The individual components are summarized in libraries [1], which can be easily imported into standard SPICE simulation tools. The entire product family is then ULSCHURTER ELECTRONIC COMPONENTS

White Paper SPICE library schurter.com/downloads subsequently available for the circuit simulation and can be selected according to different parameters (e.g. rated current). The different current compensated chokes can be compared with the simulation models, and their frequency behavior and their saturation behavior can be analyzed. This preliminary analysis significantly reduces the time and money spent in the prototyping phase. Simulation models The following simulation models for linear chokes featured below were verified several times with real components and checked with the freeware simulation...

SPICE library White Paper schurter.com/downloads Fig. 10: Measuring the series resistance R2 Fig. 7: Simulated frequency response of the choke DS1-20-0003 without saturation Now the same choke is simulated taking into account the saturation current of 5 A. To achieve this, a direct current source is used in the simulation. In 10 steps the DC current is increased from 0 A to 5 A and the impedance is simulated. Because of the saturation, the inductance decreases and the resonant frequency moves visibly into the higher frequency range (Fig. 8, red curve shifts to the right). 1. Simulation 2. Measurement...

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