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qr code vb.net library Magnetic Coupling. Transformers in .NET framework
CHAPTER 10 Magnetic Coupling. Transformers Recognize ANSI/AIM Code 128 In Visual Studio .NET Using Barcode Control SDK for VS .NET Control to generate, create, read, scan barcode image in .NET framework applications. Printing USS Code 128 In VS .NET Using Barcode printer for .NET Control to generate, create Code 128 Code Set B image in Visual Studio .NET applications. Fig. 239
Code 128B Reader In .NET Framework Using Barcode scanner for VS .NET Control to read, scan read, scan image in .NET framework applications. Print Barcode In Visual Studio .NET Using Barcode generation for Visual Studio .NET Control to generate, create barcode image in .NET applications. Fig. 240
Decode Bar Code In VS .NET Using Barcode recognizer for .NET framework Control to read, scan read, scan image in Visual Studio .NET applications. Code128 Creator In Visual C#.NET Using Barcode generation for VS .NET Control to generate, create Code 128 Code Set C image in .NET framework applications. Now, in order to increase the gain, we would naturally move the two coils closer to each other, thus increasing the value of k. However, as we continue to move the coils closer and closer together, a seemingly peculiar e ect takes place, as follows. At rst, as the value of k increases, the value of the gain at resonance also increases, as we would expect. This trend, however, continues only until we reach the condition of CRITICAL COUPLING, at which point the gain at resonance has reached its maximum possible value; this would be the condition for the example case of k kc 0:02 in Fig. 239. If, now, the value of k is increased BEYOND the value of kc , we nd that the gain at the normal center frequency decreases, while the gain versus frequency curve begins to show TWO SEPARATE RESONANT PEAKS, one below d 0 and one above d 0; an example of this condition is illustrated for the case of k 0:03 in Fig. 240. In this state the circuit is said to be overcoupled. We thus nd that, as the value of k increases (beyond the value of kc ), the gain at d 0 continues to decrease while the separation between the two high peaks continues to increase. Hence for large values of k the G versus d curve would become highly distorted, so that the circuit of Fig. 232 would become useless. Having said this, however, it should be noted that the use of a relatively SMALL AMOUNT of overcoupling (as in Fig. 240) can be used as a practical way to produce a relatively good type of bandpass circuit. In regard to the last statement, compare the curves for k 0:02 and k 0:03 in Figs. 239 and 240. Note that, compared with k 0:02, the somewhat overcoupled case of k 0:03 produces (for most practical purposes) a nearly attopped gain curve from approximately d 1 to d 1. Also note that the gain falls o quite rapidly for frequencies beyond the region of the two peaks. Hence, by a proper choice of k, Fig. 232 can be made to serve as a reasonably good bandpass type of circuit. This makes the circuit of Fig. 232 especially useful as an ampli er of highfrequency modulated carrier waves. This is because such a circuit will pass, with almost uniform gain, both the carrier wave and the necessary sidebands either side of the carrier, while e ectively discriminating against possible nearby interfering signals. In closing, the explanation, in words, for the existence of a doublepeaked gain curve can be summarized, very brie y, as follows. Taking Fig. 240 as an example, consider, rst, the condition of the circuit in the neighborhood of d 1. Since the frequency here is less than !0 , it follows that XC is greater than XL in both the primary and secondary circuits. Hence the reactance re ected into the primary coil is inductive in nature,* and in an amount su cient to increase the Code128 Creator In .NET Using Barcode creation for ASP.NET Control to generate, create Code 128B image in ASP.NET applications. Printing Code128 In Visual Basic .NET Using Barcode creator for .NET Control to generate, create Code 128B image in .NET applications. * See discussion note given with solution to problem 187.
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