The waveforms are in-phase because of the directions of the transformer windings as indicated in the transformer symbol are the same. The secondary voltage is 24.8 V, which makes the secondary turns to primary turns 0.2 in this case. The red waveform is the 60 Hz primary voltage of 120 V peak. Measure the primary and secondary voltages in Figure 15-4.įigure 15-4 Solution The oscilloscope shows both primary and secondary waveforms. When the top of the primary winding is positive, the top of the secondary winding is also positive. The + labels on the transformer symbol are "transformer dots" described in the textbook and indicate polarity. Notice that the transformer symbol may have a secondary center tap, which is required in some applications such as rectifiers. Although this is opposite from the definition of turns ratio in the textbook, both are valid. EWB uses the ratio of primary turns to secondary turns as the turns ratio. Several different transformer models are available in the default, audio, and miscellaneous categories. If the transformer has a center tap, it is in the middle on the right.įigure 15-2 Transformer Component Browser.įigure 15-3 Transformer Properties dialog box. Note the primary windings are on the left and the secondary windings are on the right. To change transformer parameters, such as the label, display, and fault, click on the Replace button and you get the Component Browser dialog box (the one for the Ideal model is shown in Figure 15-2).įigure 15-1 The Basic parts bin and transformer symbol. Double-click on it and get the Transformer Properties dialog box as shown in Figure 15-2. After you have picked a transformer from the Component Browser you will be able to place it on the screen. Before moving the transformer symbol onto the screen, you will need to select the transformer from the Component Browser, which will appear when you click on a transformer in the Basic part bin. The transformer is available in the Basic parts bin as shown in Figure 15-1. Use EWB instruments to measure voltages in a transformer.Examine how transformers respond to dc and ac signals.In this tutorial, example circuits with transformers are simulated and you will Chet_floyd_principles_7|Transformers|EWB|Electronics Workbench Circuit Simulation HomeĮlectronics Workbench Circuit Simulation Using multiSIM
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