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barcode in vb.net 2008 SPICE Modeling of Magnetic Components in Software
SPICE Modeling of Magnetic Components QR Code Recognizer In None Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications. QR Code 2d Barcode Maker In None Using Barcode encoder for Software Control to generate, create QR Code image in Software applications. better to stay with the physical model and implement it using the ideal components that are available in PSpice. There may be another problem with the coupled inductor model. In a typical transformer, the magnetizing inductance (L12 ) might be 5 mH. The leakage inductances may be only 0.5 H. The value of k must be speci ed with enough accuracy to recreate this difference accurately; that is, a difference of 104 . For n = 1, k12 = 0.99990 for the preceding values. Inversion of Eq. (2.5) illustrates the problem: L11 = L1 k12 n L1 L2 (2.6) Decode QR Code In None Using Barcode reader for Software Control to read, scan read, scan image in Software applications. Generate QR Code In Visual C# Using Barcode creation for .NET Control to generate, create QR Code image in Visual Studio .NET applications. L22 = L2 nk12 L1 L2 L12 = k12 n L1 L2
Encoding Quick Response Code In .NET Using Barcode creator for ASP.NET Control to generate, create QR Code ISO/IEC18004 image in ASP.NET applications. Draw QR Code In .NET Using Barcode maker for .NET framework Control to generate, create QRCode image in .NET applications. L11 and L22 are the small difference between two large numbers. In general, you should compute ki j to four decimal places. Reluctance and Physical Models The basic problem when simulating a magnetic component is to translate the physical structure of the device into an equivalent electric circuit. PSpice will use the equivalent circuit to simulate the device. Reluctance modeling, combined with a duality transformation, provides a means to accomplish this task. Reluctance modeling creates a magnetic circuit model that can then be converted into an electric circuit model. Table 2.1 shows a number of analogous quantities between electric and magnetic circuits. By comparing the form of the equations in each column, the following analogous quantities can be identi ed: EMF (V ) and MMF (F ) Electric eld (E) and magnetic eld (H ) intensities Current density (J ) and ux density (B) Current (I ) and ux ( ) Resistance (R) and reluctance (R ) Conductivity ( ) and permeability ( ) Reluctance is computed in the same manner as resistance, that is, from the dimensions of the magnetic path and the magnetic conductivity ( ). Make QR Code In Visual Basic .NET Using Barcode maker for .NET framework Control to generate, create Quick Response Code image in .NET framework applications. Encode UPCA In None Using Barcode maker for Software Control to generate, create UCC  12 image in Software applications. Two
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Bar Code Generation In None Using Barcode printer for Software Control to generate, create barcode image in Software applications. Draw Code 128 In None Using Barcode creator for Software Control to generate, create Code 128C image in Software applications. Electric and Magnetic Circuit Analogous Quantities Magnetic F NI = magnetic circuit voltage (magnetomotive force) H magnetic eld intensity F = H dlm = Hlm F NI H= = lm lm B magnetic ux density B = H = permeability 0 = 4 10 7 H/m magnetic ux = s B d s = BAm R = reluctance lm N2 R = F = = Am L P = 1/R = permeance MSI Plessey Generator In None Using Barcode maker for Software Control to generate, create MSI Plessey image in Software applications. Printing USS Code 39 In ObjectiveC Using Barcode maker for iPad Control to generate, create Code 39 Extended image in iPad applications. Electric V electric circuit voltage (Electromotive force) E electric eld intensity V = E dlc = Elc V E= lc J current density J= E = conductivity I electric current I = s J d s = JAc R = resistance V lc R= = I Ac G = 1/R = conductance Data Matrix Generation In .NET Framework Using Barcode printer for Visual Studio .NET Control to generate, create Data Matrix image in Visual Studio .NET applications. Decoding Code 128 In None Using Barcode decoder for Software Control to read, scan read, scan image in Software applications. For a constant crosssectional area (Am ), the reluctance is R = lm Am (2.7) UCC  12 Drawer In None Using Barcode creator for Online Control to generate, create UPCA Supplement 5 image in Online applications. Paint Bar Code In C# Using Barcode drawer for .NET Control to generate, create barcode image in Visual Studio .NET applications. where = o r r = relative permeability The inductance of a magnetic circuit is directly related to R and N (the number of winding turns): L= and M12 = N1 N2 = N1 N2 P12 N12 N2 = N 2P R (2.8) Barcode Drawer In None Using Barcode creator for Microsoft Excel Control to generate, create bar code image in Microsoft Excel applications. Drawing Barcode In VS .NET Using Barcode creation for Reporting Service Control to generate, create bar code image in Reporting Service applications. where P = permeance = 1/R . The example in Fig. 2.8 illustrates the development of the reluctance model for a simple inductor with an air gap in the core. The model develops as follows: Divide the core, including the air gaps, into sections and assign a reluctance to each one (as shown in Fig. 2.8B). Compute the reluctance for each section. Assign a magnetic voltage source to the winding with F = NI. Draw the equivalent network as shown in Fig. 2.9. SPICE Modeling of Magnetic Components
i N turns Air Gaps c b
Material permeability of both cores = m
e lg
Mean Path Lengths R2 R2 Rg Rg R2 R1
(bc) R1 R2
(e 12 c ) Figure 2.8 The development of the reluctance model for a simple inductor with an air gap.
Figure 2.9 is the reluctance model that represents the magnetic structure at the top of Fig. 2.8. Now we need to convert this reluctance model to an equivalent electric circuit model, but before we can do that, it will help to brie y review the duality transformation. We can then proceed to convert the reluctance model. An example of a duality transformation is given in Fig. 2.10. A node is placed within each mesh, including the outer mesh. Branches, which R1 = (b c )

