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1. Chapter 8. Methods of Analysis. 2. Constant Current Sources. Maintains same
current in branch of circuit. Doesn t matter how components are connected ...
Chapter 8 Methods of Analysis
Constant Current Sources Maintains same current in branch of circuit Doesn t matter how components are connected external to the source
Direction of current source indicates direction of current flow in branch 2
1
Constant Current Sources Voltage across current source Depends on how other components are connected
3
Constant Current Sources Series circuit Current must be same everywhere in circuit
Current source in a series circuit Value of the current for that circuit
For the circuit shown I = 2 mA 4
2
Constant Current Sources
5
Source Conversions Circuit analysis Sometimes convenient to convert between voltage sources and current sources
To convert from a voltage source to a current source Calculate current from E/RS 6
3
Source Conversions RS does not change Place current source and resistor in parallel
7
Source Conversions Can also convert from a current source to a voltage source E = I RS Place voltage source in series with resistor
8
4
Source Conversions
9
Source Conversions A load connected to a voltage source or its equivalent current Should have same voltage and current for either source
10
5
Source Conversions Although sources are equivalent Currents and voltages within sources may differ
Sources are only equivalent external to terminals
11
Current Sources in Parallel and Series Current sources in parallel Simply add together algebraically
Magnitude and direction of resultant source Add currents in one direction Subtract currents in opposite direction
12
6
Current Sources in Parallel and Series Current sources with different values Never place in series This violates KCL
13
Branch Current Analysis For circuits having more than one source Use different methods of analysis Begin by arbitrarily assigning current directions in each branch Label polarities of the voltage drops across all resistors
14
7
Branch Current Analysis Write KVL around all loops Apply KCL at enough nodes so all branches have been included Solve resulting equations
Mesh Analysis Arbitrarily assign a clockwise current to each interior closed loop (Mesh) Indicate voltage polarities across all resistors Write KVL equations
17
Mesh Analysis Solve resulting simultaneous equations Branch currents determined by: Algebraically combining loop currents common to branch
18
9
Mesh Analysis Assign loop currents and voltage polarities Using KVL: 6 - 2I1 - 2I1 + 2I2 - 4 = 0 4 - 2I2 + 2I1 - 4I2 + 2 = 0 Simplify and solve equations
19
Mesh Analysis
20
10
Format Approach Mutual resistors represent resistors shared between two loops R12 represents resistor in loop 1 that is shared by loop 1 and loop 2 Coefficients along principal diagonal will be positive 21
Format Approach All other coefficients will be negative Terms will be symmetrical about principal diagonal
22
11
Format Approach Convert current sources into equivalent voltage sources Assign clockwise currents to each independent closed loop Write simultaneous linear equations Use format outline or matrix method 23
Format Approach Solve resulting simultaneous equations or matrix equations Use a calculator or software program to solve
24
12
Nodal Analysis Assign a reference node within circuit and indicate node as ground Convert voltage sources to current sources
25
Nodal Analysis Assign voltages V1, V2, etc. to remaining nodes Arbitrarily assign a current direction to each branch where there is no current source
26
13
Nodal Analysis Apply KCL to all nodes except reference node Rewrite each current in terms of voltage Solve resulting equations for voltages
27
Format Approach Mutual conductance Common to two nodes
Mutual conductance G23 Conductance at Node 2 Common to Node 3
Conductances at certain nodes are positive 28
14
Format Approach Mutual conductances are negative Equations are written correctly Terms will be symmetrical about principal diagonal
29
Format Approach Convert voltage sources into equivalent current sources Label reference node as ground Label remaining nodes as V1, V2, etc.
30
15
Format Approach Write linear equation for each node or in matrix form Solve resulting equations for voltages Method of solution is same as for mesh
31
Delta-Wye Conversion Resistors connected to a point of Y Obtained by finding product of resistors connected to same point in Delta Divide by sum of all Delta resistors
32
16
Delta-Wye Conversion Given a Delta circuit with resistors of 30, 60, and 90 Resulting Y circuit will have resistors of 10, 15, and 30
33
Wye-Delta Conversions A Delta resistor is found: Taking sum of all two-product combinations of Y resistor values Divide by resistance of Y directly opposite resistor being calculated
34
17
Wye-Delta Conversions For a Y circuit having resistances of 2.4, 3.6, and 4.8 Resulting Delta resistors will be 7.8, 10.4, and 15.6
35
18
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