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

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.

What you will learn

  • What is the expression for power transferred to a load?
  • How can one maximize power transfer to a load circuit?
  • What is the condition for maximum power transfer?
  • What is the goal of designing a load circuit?
  • How does the author derive the expression for maximum power transfer?

Typology: Exams

2021/2022

Uploaded on 09/12/2022

courtneyxxx
courtneyxxx 🇺🇸

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Scott Starks, PhD, PE
Professor of ECE
UTEP
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Download Maximizing Power Transfer to a Load Circuit and more Exams Basic Electronics in PDF only on Docsity!

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  