Impedance matching vs max power transfer criterion

Click For Summary

Discussion Overview

The discussion explores the relationship and potential differences between "impedance matching" and the "maximum power transfer" criterion, focusing on their implications in circuit design and power transmission.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants propose that both impedance matching and maximum power transfer involve designing one impedance to be the complex conjugate of the other.
  • One participant asserts that performing impedance matching can maximize power transfer, referencing a Wikipedia article for further information.
  • Another participant suggests sketching a simple circuit with a chosen internal impedance to investigate how various load impedances affect power transfer.
  • A participant introduces the concept of a quarter-wave transformer, stating that it can maximize power transmission by mismatching the load to the coax, providing an example of specific impedance values.

Areas of Agreement / Disagreement

Participants express differing views on the relationship between impedance matching and maximum power transfer, indicating that the discussion remains unresolved.

Contextual Notes

Some assumptions about the definitions of impedance matching and maximum power transfer are not explicitly stated, and the implications of using a quarter-wave transformer are not fully explored.

Si14
Messages
75
Reaction score
0
Hello,

I wonder if there's any difference between the "impedance matching" and "maximum power transfer" criterion?
I assume in both cases, one impedance should be designed to be the complex conjugate of the other.

Thanks.
 
Engineering news on Phys.org
By PERFORMING impedance matching you can maximize power transfer.

Wiki says,

...impedance matching is the practice of designing...

http://en.wikipedia.org/wiki/Impedance_matching"
 
Last edited by a moderator:
Si14 said:
I wonder if there's any difference between the "impedance matching" and "maximum power transfer" criterion?
I assume in both cases, one impedance should be designed to be the complex conjugate of the other.
Why don't you sketch up a simple circuit with a source that has an internal impedance of your choice, and see how various load impedances affect the power transfer?
 
A quarter-wave transformer (quarter wavelength of transmission line) between the source and the load can maximize power transmission by mismatching the load to the coax. See

http://en.wikipedia.org/wiki/Quarter_wave_impedance_transformer

For example, a quarter wave of 50-ohm transmission line can match a 100-ohm source to a 25-ohm load.

Bob S
 

Similar threads

Replies
1
Views
2K
Replies
24
Views
3K
Replies
33
Views
4K
  • · Replies 10 ·
Replies
10
Views
2K
  • · Replies 8 ·
Replies
8
Views
3K
  • · Replies 7 ·
Replies
7
Views
3K
  • · Replies 8 ·
Replies
8
Views
5K
  • · Replies 7 ·
Replies
7
Views
2K
Replies
23
Views
4K
  • · Replies 9 ·
Replies
9
Views
3K