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**Sinusoidal steady-state analysis**

Chapter 10 Sinusoidal steady-state analysis SJTU

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**Steps to analyze ac circuit**

Transform the circuit to the phasor or frequency domain Solve the problem using circuit techniques(nodal analysis, mesh analysis, superposition,etc) Transform the resulting phasor to the time domain SJTU

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Nodal analysis Fig. 8-28: An example node SJTU

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**Mesh analysis planar circuits:**

Circuits that can be drawn on a flat surface with no crossovers the sum of voltages around mesh A is Fig. 8-29: An example mesh SJTU

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**or EXAMPLE 8-21 Use node analysis to find the current IX in Fig. 8-31.**

SOLUTION: or Fig. 8-31 SJTU

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**DS:example on F page 394, notebook p105**

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EXAMPLE 8-24 The circuit in Fig is an equivalent circuit of an ac induction motor. The current IS is called the stator current, IR the rotor current, and IM the magnetizing current. Use the mesh-current method to solve for the branch currents IS, IR and IM. SJTU

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SJTU

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EXAMPLE 8-25 Use the mesh-current method to solve for output voltage V2 and input impedance ZIN of the circuit below. SOLUTION: SJTU

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SJTU

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**Frequency domain equivalent of the circuit**

Example Frequency domain equivalent of the circuit SJTU

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Example SJTU

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Find Vo/Vi, Zi See F page417 SJTU

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**Circuit Theorems with Phasors**

PROPORTIONALITY The proportionality property states that phasor output responses are proportional to the input phasor where X is the input phasor, Y is the output phasor, and K is the proportionality constant. SJTU

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**Assume a unit output voltage . By Ohm's law, . By KVL, By Ohm's law, **

EXAMPLE 8-13 Use the unit output method to find the input impedance, current I1, output voltage VC, and current I3 of the circuit in Fig for Vs= 10∠0° Assume a unit output voltage . By Ohm's law, . By KVL, By Ohm's law, By KCL, By KCL, SOLUTION: SJTU

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**Given K and ZIN, we can now calculate the required responses for an input**

SJTU

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**With same frequency sources. With different frequency sources**

SUPERPOSITION Two cases: With same frequency sources. With different frequency sources EXAMPLE 8-14 Use superposition to find the steady - state voltage vR (t) in Fig for R=20 , L1 = 2mH, L2 = 6mH, C = 20 F, V s1= 100cos 5000t V , and Vs2=120cos (5000t +30 )V. SJTU

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SOLUTION: Fig. 8-22 SJTU

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SJTU

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**With source no. 2 off and no.1 on**

EXAMPLE 8-15 Fig. 8-23 Use superposition to find the steady-state current i(t) in Fig for R=10k , L=200mH, vS1=24cos20000t V, and vS2=8cos(60000t+30 ° ). SOLUTION: With source no. 2 off and no.1 on SJTU

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**With source no.1 off and no.2 on**

The two input sources operate at different frequencies, so that phasors responses I1 and I2 cannot be added to obtain the overall response. In this case the overall response is obtained by adding the corresponding time-domain functions. SJTU

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More examples See F page403 SJTU

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**THEVENIN AND NORTON EQUIVALENT CIRCUITS**

The thevenin and Norton circuits are equivalent to each other, so their circuit parameters are related as follows: SJTU

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**Source transformation**

SJTU

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EXAMPLE 8-17 Both sources in Fig. 8-25(a) operate at a frequency of =5000 rad/s. Find the steady-state voltage vR(t) using source transformations. SOLUTION: + SJTU

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EXAMPLE 8-18 Use Thevenin's theorem to find the current Ix in the bridge circuit shown in Fig Fig. 8-26 SJTU

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SOLUTION: SJTU

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1 ECE 3144 Lecture 32 Dr. Rose Q. Hu Electrical and Computer Engineering Department Mississippi State University.

1 ECE 3144 Lecture 32 Dr. Rose Q. Hu Electrical and Computer Engineering Department Mississippi State University.

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