Phase Shift for an RL Circuit

Chapter Phase Shift for an RL Circuit

Complete Electronics Self Teaching Guide with Projects
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Complete Electronics Self Teaching Guide with Projects

  • CHAPTER 6 FILTERS258PHASE SHIFT FOR AN RL CIRCUIT34  Filter circuits that use inductors (such as those shown in Figure 6.51) produce a phase shift in the output signal, just as filter circuits containing capacitors do. You can see the shifts for the circuits shown in Figure 6.51 by comparing the input and output waveforms shown below the circuit diagrams.VinVout = VRR(1)LVinVout = VLLRVinVout = VR(2)VinVout = VLFIGURE 6.51QUESTIONIn which circuit does the output voltage lead the input voltage? ANSWERIn graph (1), the output voltage lags the input voltage, and in graph (2), the output voltage leads.35  Figure 6.52 shows a vector diagram for both the circuits shown in Figure 6.51. The cur-rent through the inductor lags the voltage across the inductor by 90 degrees.Book Authorc06V107/04/2012 3:08 PM c06.indd 2587/4/2012 3:10:27 PM