Ratio of power into load and driver transistor - diyAudio
 Ratio of power into load and driver transistor
 User Name Stay logged in? Password
 Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read Search

 Solid State Talk all about solid state amplification.

 Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
 27th November 2009, 01:58 AM #2 diyAudio Member     Join Date: Apr 2008 Location: Carlisle, England For.a.4.ohm.load.and.60.volt.b+ Applied.sine.wave.peak.voltage....power.in.transis tor....power.in.speaker. 60..........................................116... .....................439 50..........................................154... .....................304 40..........................................166... .....................193 30..........................................156... .....................107 20..........................................116... .....................46 10..........................................60.... ......................10 It can be seen that there is more power in the transistor at around a 30 volt sine wave than on 60 volt sine wave. __________________ Murton-Pike Systems PCBCAD51 pcb design software. http://www.murtonpikesystems.co.uk http://www.pcbcad51.co.uk Last edited by nigelwright7557; 27th November 2009 at 02:01 AM.
 27th November 2009, 01:59 PM #3 diyAudio Member     Join Date: Sep 2006 Congratulations: you have just reinvented the wheel (sort of): http://www.phy.auckland.ac.nz/Staff/...amplifiers.pdf
 27th November 2009, 03:07 PM #4 diyAudio Member   Join Date: Jan 2006 Location: massachusetts Your numbers are in the right ballpark, but seem off. I'm not familiar with the program language, but it looks you should be diding your steps by 360, not 256. RMS voltage should be .6366 times peak voltage, which would give you a power of 357 watts into a 4 ohm load, and 89.25 at 30 volts peak. __________________ Steve
diyAudio Member

Join Date: Apr 2008
Location: Carlisle, England
Quote:
 Originally Posted by sregor Your numbers are in the right ballpark, but seem off. I'm not familiar with the program language, but it looks you should be diding your steps by 360, not 256. RMS voltage should be .6366 times peak voltage, which would give you a power of 357 watts into a 4 ohm load, and 89.25 at 30 volts peak.
The divide by 256 is because the sine table values are 0-255 and not 0-1, I pinched the table from anotehr program of mine.

Your absolutely right I should divide by 360 because there are 360 samples taken which is just the same as integrating. I have now added a div 360 on my program and it makes much more sense now.
__________________

diyAudio Member

Join Date: Apr 2008
Location: Carlisle, England
Quote:
 Originally Posted by Elvee Congratulations: you have just reinvented the wheel (sort of): http://www.phy.auckland.ac.nz/Staff/...amplifiers.pdf
Yes it looks pretty much what I came up with just integrating the results over a full cycle.

It was interesting to do because I also added another variable for the amplitude of the sine wave so I could try different amplitude sines with different b+ rails.
__________________

diyAudio Member

Join Date: Sep 2006
Quote:
 Originally Posted by nigelwright7557 Yes it looks pretty much what I came up with just integrating the results over a full cycle. It was interesting to do because I also added another variable for the amplitude of the sine wave so I could try different amplitude sines with different b+ rails.
Formula (16) does that, and shows that max dissipation occurs when the supply to output voltage ratio is pi/2, independent of the absolute voltage level, load, etc

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are Off Pingbacks are Off Refbacks are Off Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post luka Power Supplies 43 9th February 2012 03:50 PM oaristys Multi-Way 86 11th June 2009 05:20 PM ionomolo Solid State 3 16th February 2009 10:09 PM John Biles Solid State 7 2nd August 2005 04:27 PM

 New To Site? Need Help?

All times are GMT. The time now is 11:09 PM.