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Inductor Coupling (and Magnetic Core)

Analog DevicesK2-56 Inductor Coupling (and Magnetic Core) Transmission Line CouplingGeneral FormK<name> L< Inductor name> <L< Inductor name>>* < Coupling value>K<name> <L< Inductor name>>* < Coupling value> <model name> [size value]K<name>T<transmission line name>T<transmission line name> + Cm=<capacitive Coupling > Lm=<inductive Coupling >ExamplesKTUNED L3 OUT L4IN .8 KTRNSFRM LPRIMARY LSECNDRY 1 KXFRM L1 L2 L3 L4 .98 KPOT_3C8K2 LINES T1 T2 Lm=1m Cm=.5pModel <model name> core [model parameters]DescriptionThis device can be used to define Coupling between inductors (transformers) or between transmission lines.

Analog Devices K 2-56 Inductor Coupling (and Magnetic Core) Transmission Line Coupling General Form K<name> L<inductor name> <L<inductor name>>* <coupling value> K<name> <L<inductor name>>* <coupling value> <model name> [size value]

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  Core, Coupling, Inductors, Magnetic, Inductor coupling, And magnetic core

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Transcription of Inductor Coupling (and Magnetic Core)

1 Analog DevicesK2-56 Inductor Coupling (and Magnetic Core) Transmission Line CouplingGeneral FormK<name> L< Inductor name> <L< Inductor name>>* < Coupling value>K<name> <L< Inductor name>>* < Coupling value> <model name> [size value]K<name>T<transmission line name>T<transmission line name> + Cm=<capacitive Coupling > Lm=<inductive Coupling >ExamplesKTUNED L3 OUT L4IN .8 KTRNSFRM LPRIMARY LSECNDRY 1 KXFRM L1 L2 L3 L4 .98 KPOT_3C8K2 LINES T1 T2 Lm=1m Cm=.5pModel <model name> core [model parameters]DescriptionThis device can be used to define Coupling between inductors (transformers) or between transmission lines.

2 This device also refers to a nonlinear Magnetic core ( core ) model to include Magnetic hysteresis effects in the behavior of a single Inductor (winding), or in multiple coupled DevicesKInductor Coupling Arguments and OptionsK<name> L< Inductor name>Couples two or more inductors . Place a period ( . ) on the first node of each Inductor . For example:I1 1 0 AC 1mAL1 1 0 10uHL2 2 0 10uHR2 2 0 .1K12 L1 L2 1 The current through L2 is in the opposite direction as the current through L1. The polarity is determined by the order of the nodes in the L devices and not by the order of inductors in the K statement.

3 < Coupling value>This is the coefficient of mutual Coupling , which must be between zero and 1. This coefficient is defined by the equation< Coupling value> = Mij/(Li Lj)1/2whereLi,Lj = a coupled-pair of inductorsMij= the mutual inductance between Li and LjFor transformers of normal geometry, use as the value. Values less than occur in air core transformers when the coils do not completely overlap.<model name>If <model name> is present, four things change: The mutual Coupling Inductor becomes a nonlinear, Magnetic core device.

4 The Magnetic core s B-H characteristics are analyzed using the Jiles-Atherton model (see Inductor Coupling : Jiles-Atherton model). The inductors become windings, so the number specifying inductance now specifies the number of turns. The list of coupled inductors could be just one Inductor . A model statement is required to specify the model parameters.[size value] Has a default value of and scales the Magnetic cross-section. It is intended to represent the number of lamination layers, so only one model statement is needed for each lamination type.

5 For example:L1 5 9 20 ; Inductor having 20 turnsK1 L1 1 K528T500_3C8; Ferroxcube toroid coreL2 3 8 15 ; primary winding having ; 15 turnsL3 4 6 45 ; secondary winding having ; 45 turnsK2 L2 L3 1 K528T500_3C8; another core (not the same as K1)Analog DevicesK2-58 Here is a Probe B-H display of 3C8 ferrite (Ferroxcube).CommentsThe linear branch relation for transient analysis isVi = Li + Mij + Mik + For Berkeley SPICE2: if there are several coils on a transformer, then there must be K statements Coupling all combinations of Inductor pairs.

6 For instance, a transformer using a center-tapped primary and two secondaries could be written:* PRIMARYL1 1 2 10uHL2 2 3 10uH* SECONDARYL3 11 12 10uHL4 13 14 10uH* Magnetic COUPLINGK12 L1 L2 1K13 L1 L3 1K14 L1 L4 1K23 L2 L3 1K24 L2 L4 1K34 L3 L4 1 This older technique is still supported, but not required, for simulation. The same transformer can also be written:* PRIMARYL1 1 2 10uHL2 2 3 10uH* SECONDARYL3 11 12 10uHL4 13 14 10uH* Magnetic COUPLINGKALL L1 L2 L3 L4 1Do not mix the two DevicesKSchematics SymbolsSee your PSpice user s guide for information about using nonlinear Magnetic cores with transformers.

7 Breakout PartsFor non-stock passive and semiconductor devices, Schematics provides a set of breakout parts designed for customizing model parameters for simulation. These are useful for setting up Monte Carlo and worst-case analyses with device and/or lot tolerances specified for individual model parameters. Another approach is to use the model editor to derive an instance model and customize this. For example, you could add device and/or lot tolerances to model breakout part names consist of the intrinsic PSpice A/D device letter plus the suffix BREAK.

8 By default, the model name is the same as the part name and references the appropriate device model with all parameters set at their default. For instance, the DBREAK part references the DBREAK model which is derived from the intrinsic PSpice A/D D model (.MODEL DBREAK D)Using the KBREAK symbolThe Inductor Coupling symbol, KBREAK, can be used to couple up to six independent inductors on a schematic. A MODEL attribute is provided for using nonlinear Magnetic core The simulator uses the Jiles-Atherton model (see Inductor Coupling : Jiles-Atherton model) to analyze the B-H curve of the Magnetic core and calculate values for inductance and flux for each of the state of the nonlinear core can be viewed in Probe by specifying B(Kxxx) for the magnetization or H(Kxxx) for the magnetizing influence.

9 These values are not available for .PRINT (Print) or .PLOT (Plot) NameModel TypeAttributeAttribute DescriptionXFRM_LINEAR transformerL1_VALUEL2_VALUE winding inductances in HenriesCOUPLING coefficient of mutual Coupling (must lie between 0 and 1)K_LINEAR transformerLninductor reference designatorXFRM_NONLINEAR transformerL1_TURNSL2_TURNS number of turns on each windingCOUPLING coefficient of mutual Coupling (must lie between 0 and 1)MODEL nonlinear core model nameAnalog DevicesK2-60( core ) models, if desired.

10 By default, KBREAK references the KBREAK model contained in ; this model, in turn, uses the default core model KBREAK symbol can be used to: Provide linear Coupling between inductors . Reference a core model in a configured model library file. Define a user-defined core model with custom model parameter dot convention for the Coupling is related to the direction in which the inductors are connected. The dot is always next to the first pin to be netlisted. For example, when the Inductor symbol L is placed without rotation, the dotted pin is the left one.


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