Maximizing Power Transfer to a Load Circuit, Exams of Basic Electronics

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Scott Starks, PhD, PE

Professor of ECE

UTEP

 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

R R

R R R

R R R

R R R R R

So, maximum power is transferred to the

load when the load has a resistance equal

to the resistance of the source!

 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  

