Klasse A virkningsgrad

Do you have a question? Post it now! No Registration Necessary

Translate This Thread From Danish to

Threaded View

som den skal. :-)



"A theoretical efficiency of 50% is obtainable with transformer output  
coupling and only 25% with capacitive coupling,"


dualsupply.


hvileeffekt, 8 ohms load. Det giver +-16V udsving, og +-2A i load.  






transistor er nul, mens den leverer 2A til load.

Overser jeg noget, eller er der fejl i Wiki?

--  
Ulrik Smed
Aarhus

Re: Klasse A virkningsgrad
On 15/03/14 18.42, Ulrik Smed wrote:

Quoted text here. Click to load it


Quoted text here. Click to load it

Quoted text here. Click to load it

Quoted text here. Click to load it

Quoted text here. Click to load it




Quoted text here. Click to load it

Hej Ulrik



Med formler:
http://www.electronics-tutorials.ws/amplifier/amp_5.html

http://sound.westhost.com/efficiency.htm#classa

http://web.cecs.pdx.edu/~campbell/PAefficiency1.pdf

http://www.zedaudiocorp.com/Technical/Amplifier-Efficiency.pdf

/Glenn

Re: Klasse A virkningsgrad
Den 15-03-2014 19:30, Glenn skrev:
Quoted text here. Click to load it

Quoted text here. Click to load it

Hah, der var forklaringen! De 25% er single-ended.

Another type of Class-A amplifier uses the same circuit as Figure 1, but  

signal, the transistors can draw up to double the quiescent current at  
waveform peaks, or zero at the opposite peak (one transistor will be  
double and the other zero as the waveform alternates). Dynamic analysis  
of this arrangement is harder than either of the other topologies  
described, but if we examine the quiescent state and the maximum output,  
a reasonable estimate is possible. Using the same values as before, we  
have 20V across each transistor, at a quiescent current of 1.25A. Each  
transistor will therefore dissipate 25W with no signal, and maximum  
power is also 25W. Efficiency is therefore ...

Eff = 25 / 50 * 100 = 50%

Quoted text here. Click to load it

--  
Ulrik Smed
Aarhus

Re: Klasse A virkningsgrad
Den 15-03-2014 19:30, Glenn skrev:
Quoted text here. Click to load it



ensretteren. ;-)

--  
Ulrik Smed
Aarhus

Re: Klasse A virkningsgrad
Den 15-03-2014 18:42, Ulrik Smed skrev:

Quoted text here. Click to load it


Quoted text here. Click to load it

Quoted text here. Click to load it

Quoted text here. Click to load it

Quoted text here. Click to load it




Quoted text here. Click to load it


med kunstigt nulpunkt ved 16Volt.


transistor.


rammer 50%.

Karl Erik.


Re: Klasse A virkningsgrad
Den 15-03-2014 19:36, Karl Erik Christensen skrev:

Quoted text here. Click to load it




Quoted text here. Click to load it

Quoted text here. Click to load it






--  
Ulrik Smed
Aarhus

Re: Klasse A virkningsgrad

grader af udgangs-signalet.



100% ampere i den positive forsyning.














Da man beregner effektivitet'en over 360 grader af musik-signalel, skal  
man huske at det er hele den positive periode af sinus'en tilsammen vi  







transistorer i varme. )






lav.



kommer til realitet'erne.

/ Lars

Den 15-03-2014 18:42, Ulrik Smed skrev:

Quoted text here. Click to load it


Quoted text here. Click to load it

Quoted text here. Click to load it

Quoted text here. Click to load it




= 8W drift / 32W Tomgang = 25%. ...





Quoted text here. Click to load it


Re: Klasse A virkningsgrad
Den 15-03-2014 20:16, Lars / Viborg skrev:

Quoted text here. Click to load it


Quoted text here. Click to load it


Quoted text here. Click to load it









--  
Ulrik Smed
Aarhus

Site Timeline