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News:

Spectrum Software has released Micro-Cap 11, the eleventh generation of our SPICE circuit simulator.

For users of previous Micro-Cap versions, check out the new features available in the latest version. For those of you who are new to Micro-Cap, take our features tour to see what Micro-Cap has to offer.

 

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Questions and Answers - Summer 2011

 

Question: I would like to simulate coupling between multiple inductances in my circuit. I have placed the inductor components in the correct locations. How do I couple these inductors together?

Answer: The K component available in Micro-Cap will couple inductors using either the linear mutual inductance or the nonlinear Jiles-Atherton core magnetics model. The K component is located in the Analog Primitives / Passive Components section of the Component menu. The procedure for each of the possible couplings is as follows:

Linear Mutual Inductance
1) Place an inductor component in the schematic for each inductance that is to be coupled. The INDUCTANCE attribute of each inductor should be defined with the corresponding inductance value.

2) Place a K component in the schematic. The K component has no external connections so it can be placed anywhere in the circuit. The INDUCTORS attribute needs to be defined with the part name of each inductor that is to be coupled. For example, if the inductors L1, L4, and L6 were to be coupled together, the INDUCTORS attribute should be specified as:

L1 L4 L6

A minimum of two inductors must be in this list. The COUPLING attribute should then be defined with the coupling coefficient value. The MODEL attribute needs to remain undefined.

Upon hitting OK in the Attribute dialog box, the specified inductors will then be coupled.

Nonlinear Jiles-Atherton core magnetics model
1) Place an inductor component in the schematic for each winding that is to be coupled. The INDUCTANCE attribute of each inductor should be defined with the number of turns for the winding. The number of turns must be a constant, whole number.

2) Place a K component in the schematic. The INDUCTORS and COUPLING attributes need to be defined in the same manner as the above procedure. In this case, the list can contain just one inductor. A single inductor will create a single magnetic core device not coupled to another inductor. The MODEL attribute must then be defined with the name of a core model. The presence of a model name signifies that this coupling will use the Jiles-Atherton model.

Upon hitting OK in the Attribute dialog box, the specified inductors will now use the nonlinear Jiles-Atherton magnetics model.

 
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