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The approach to designing a load circuit to maximize power transfer from an input circuit. The text begins by introducing the concept of power transfer and the need to find the optimal resistance value (RL) for the load circuit. The author derives the expression for power transferred to the load and explains that the maximum power is achieved when the load resistance equals the source resistance.
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For certain applications, it is desirable to
maximize the power (PL) that is transferred from the Input circuit to the Load circuit.
We begin by replacing the original Model with
a Simplified Model.
Find the value of RL that achieves maximum
Power transfer.
The power (PL) that is transferred to the Load
can be expressed as
2 s L
s L L L L R R
v R P i v
The expression for the Power transferred to
the Load is a nonlinear function of RL.
Slope
We need to find this value!
(Slope is zero.)
s L
s L L
s L L
s L L s L
The condition that should be met to achieve
maximum power transfer is
When this condition is met, the maximum
power can be expressed as
RL Rs
(^) L
s
s L
s L
R
v
R R
v R P 4
2
2
2
max