Techniques of Circuit Analysis

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Presentation transcript:

Techniques of Circuit Analysis Source Transformations Thevenin and Norton Equivalents Maximum Power Transfer Superposition Lecture 6

Source Transformations Replacing a voltage source in series with a resistor by a current source in parallel with the same resistor Equivalence is achieved if any resistor RL has the same current flow, and thus has the same voltage drop whether connected between nodes a,b in both figures

Source Transformations

Source Transformations

THEVENIN & NORTON THEVENIN’S THEOREM: Thevenin equivalent circuit is an independent voltage source VTH in series with a resistor RTH This circuit is equivalent to the original circuit, so if we connect the same load across the terminals a, b of each circuit, we get the same voltage and current at the terminals of the load.

THEVENIN & NORTON If the load resistance is large, we have an open-circuit condition, which is VTH at terminals a, b. Reducing the load resistance to zero gives us a short-circuit condition, which is identical to a short-circuit placed across the terminal a, b

THEVENIN & NORTON Finding Thevenin equivalent:

THEVENIN & NORTON Thevenin equivalent Norton equivalent

THEVENIN & NORTON Rth can be calculated by deactivating all independent sources and then calculate the resistance seen looking into the network at the designated terminal pair. A voltage source is deactivated by replacing it with a short circuit. A current source is deactivated by replacing it with an open circuit.

Using source transformation, produces the Thevenin equivalent circuit

THEVENIN & NORTON If a 24Ω resistor is connected across the terminals a, b in both circuits, the voltage across it is 24V

THEVENIN & NORTON

Maximum Power Transfer RL load is connected to the terminal a, b. Find the value of RL that permits max. power delivery to RL. To find RL that maximizes the power, we derive p with respect to RL:

Maximum Power Transfer

= Superposition The branch currents i1, i2, i3 and i4 The branch currents resulting from the 120 V voltage source + The branch currents resulting from the 12 A current source.

Superposition