ECE 211 WORKSHOP: NODAL AND LOOP ANALYSIS. Tutor: Asad Akram
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1 ECE 211 WORKSHOP: NODAL AND LOOP ANALYSIS Tutor: Asad Akram 1
2 AGENDA Background: KCL and KVL. Nodal Analysis: Independent Sources and relating problems, Dependent Sources and relating problems. Loop (Mesh Analysis): Independent Sources and relating problems, Dependent Sources and relating problems. Practice Problems and solutions. 2
3 KCL AND KVL REVIEW Rule: Algebraic sum of electrical current that merge in a common node of a circuit is zero. Rule: The sum of voltages around a closed loop circuit is equal to zero. 3
4 KCL AND KVL EXAMPLE Find I and Vbd in the following circuit? Solution: Using KCL we know that only 1 current I flows in the loop. Then we apply Ohm s law to find the current I. Lastly, we use KVL in the single loop to evaluate the voltage Vbd. We therefore see how KCL and KVL can used as simple analysis tools. 4
5 NODAL ANALYSIS Nodal Analysis of electronic circuits is based on assigning Nodal voltages at various nodes of the circuit with respect to a reference and then finding these nodal voltages to analyze the circuit. Simple representation of Nodal Voltages shown below: As shown in Figure, a node is a point in a circuit where two or more wires meet. At these nodes one can assign a nodal voltage with respect to the reference ground shown. 5
6 NODAL ANALYSIS: INDEPENDENT SOURCES ONLY First we find the number of KCL equations (These are used to find the nodal voltages). N -1 = n, here N = number of equations, n = number of nodes. Then we write the KCL equations for the nodes and solve them to find the respected nodal voltages. Once we have these nodal voltages, we can use them to further analyze the circuit. SuperNode: Two Nodes with a independent Voltage source between them is a Super node and one forms a KVL equation for it. Example1 (Circuit with Ind. Current Sources): Find the Nodal Voltages in the circuit? 6
7 NODAL ANALYSIS: INDEPENDENT SOURCES ONLY In this example we write the KCL equations at the nodes as Shown, then solve them to find The respected nodal voltages. 7
8 NODAL ANALYSIS: INDEPENDENT SOURCES ONLY Example2 (Ind. Voltage Sources Only): For this Problem, we first make the main KCL equation at the only node 1. Current is taken to be coming out of the node as positive. We solve this equation to find The nodal voltage V1. Once this is determined, Io is simply found by using Ohm s law at the sole resistor of 3KOhm. 8
9 NODAL ANALYSIS: DEPENDENT SOURCES Find Vo using Nodal Analysis? For this Circuit, We need to Overlook the node with dependent Source and form equations round it. We use KCL at Nodes 1 and 2 and derive the equations based on Current flow. 9
10 NODAL ANALYSIS: DEPENDENT SOURCES After setting up the Nodal Eqn. For dependent Circuits, on has To make the Controlling eqn. This equation is made using the Dependent source. Using the Controlling equation we solve For the nodal voltages. 10
11 NODAL ANALYSIS: DEPENDENT SOURCES Find Io in the circuit using Nodal Analysis? Using KCL at nodes 2 and Forming a controlling equation At node 1 we can simplify the Problem into simple equations. Current entering the node is Summed at the node to form The equations. 11
12 NODAL ANALYSIS: DEPENDENT SOURCES Simplify the circuit to Obtain nodal voltage. 12
13 MESH ANALYSIS Mesh Analysis involves solving electronic circuits via finding mesh or loop currents of the circuit. This is done by forming KVL equations for respected loops and solving the equations to find individual mesh currents. We simply assume clockwise current flow in All the loops and find them to analyze the circuit. Also any independent current source in a loop Becomes the loop current as current in series is Same. 13
14 MESH ANALYSIS: INDEPENDENT SOURCES Find Vo in the circuit? Using KVL at loops 1 and 2, we form KVL equations using the current and Components in the loops in terms of The loop currents. Important thing to look at it the Subtraction of the opposing loop Current in the shared section of the Loop. 14
15 MESH ANALYSIS: INDEPENDENT SOURCES The mesh equations are solved Simultaneously and the required loop Current is found. Then we use this loop Current to find Vo in across the resistor. 15
16 MESH ANALYSIS: DEPENDENT SOURCES Find Vo in the circuit using Mesh Analysis? Simplify the circuit using the Independent sources by assigning Them to the mesh currents for The specific loop. 16
17 MESH ANALYSIS: DEPENDENT SOURCES Form KVL in Main loop 3. ` Simplify Using Vx and I2. 17
18 PRACTICE PROBLEMS 18
19 PRACTICE PROBLEMS 19
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25 END!! 25
26 SOLUTIONS TO PRACTICE PROBLEMS 26
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28 SOLUTIONS TO PRACTICE PROBLEMS 28
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120 CHAPTER 3 NODAL AND LOOP ANALYSIS TECHNIQUES SUMMARY PROBLEMS SECTION 3.1
IRWI03_082132v3 8/26/04 9:41 AM Page 120 120 CHAPTER 3 NODAL AND LOOP ANALYSIS TECHNIQUES SUMMARY Nodal analysis for an Nnode circuit Select one node in the Nnode circuit as the reference node. Assume
Example: Determine the power supplied by each of the sources, independent and dependent, in this circuit:
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