Transistorer i parallel mm.

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Jeg har leget lidt med parallelkobling af effekt transistorer.



I eksperimentet bruger jeg 2 stk. BD140 i parallel. Det skal egentlig  



Dette burde efter mit hoved resultere i ca. 13.2Volt ud.





belastes med.






http://dmwebdesign.dk/karlerik/arduino/img/trans_parallel.png


hints :-)

Karl Erik.

Re: Transistorer i parallel mm.
On 12-03-2014 22:49, Karl Erik Christensen wrote:


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Nu er 200mV vel noget du kan leve med.




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mvh Erik

Re: Transistorer i parallel mm.
Den 12-03-2014 23:50, Erik skrev:



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Hej Erik - tak for forslag.





12.34Volt, belastet med 1.4Amp 11.94Volt.



Karl Erik.


Re: Transistorer i parallel mm.
On 13-03-2014 00:29, Karl Erik Christensen wrote:
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belastningen?


igennem 7805/12.

Mvh erik

Re: Transistorer i parallel mm.
On 13-03-2014 00:29, Karl Erik Christensen wrote:

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12.34Volt, belastet med 1.4Amp 11.94Volt.
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Mon det kan forklare de 200mV?

mvh Erik

Re: Transistorer i parallel mm.
Den 13-03-2014 01:02, Erik skrev:
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Et lille skridt i den rigtige retning.

7812 belastet med en LED - 12.13V ud.



There is something rotten!

Karl Erik.


Re: Transistorer i parallel mm.
Den 13-03-2014 02:48, Karl Erik Christensen skrev:
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en L200 - jeg husker ikke hvilke power transistorer jeg brugte, dykker  
ca. 300mV ved 8.5Amp.
Har ellers altid troet, den var "State of the art".



Easy come - easy go :-)

Karl Erik.


Re: Transistorer i parallel mm.
Den 13-03-2014 02:48, Karl Erik Christensen skrev:
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direkte mellem 7812's stel og ud-ben?

Jeg har lige bygget en 20W klasse A amp, og havde lidt brumproblemer.  


over. :)

--  
Ulrik Smed
Aarhus

Re: Transistorer i parallel mm.
Den 13-03-2014 07:49, Ulrik Smed skrev:

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Indtil videre eksisterer projektet kun virtuelt i LiveWire :-)



Jeg fandt aldrig ud af rent teknisk, hvorfor det kom til at fungere.

Karl Erik.


Re: Transistorer i parallel mm.
Karl Erik Christensen skriver:
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http://www.drivehq.com/file/df.aspx/publish/UlrikSmed/PublicFolder/SkolePSU/bygpsu2.pdf



Klaus
--  
 Modelbane Europas hjemmeside: http://www.modelbaneeuropa.dk
        Min egen hjemmeside: http://www.moppe.dk
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Re: Transistorer i parallel mm.
Den 13-03-2014 14:13, Klaus D. Mikkelsen skrev:
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Utroligt at 2N3055/2N2955 ikke findes som standard, da de jo er noget af  


Karl Erik.


Re: Transistorer i parallel mm.
On 13-03-2014 13:43, Karl Erik Christensen wrote:

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hmm SKAM dig lol




loddekolben.

mvh Erik

Re: Transistorer i parallel mm.
Den 13-03-2014 23:21, Erik skrev:
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Hej Erik.



Jeg skrev:
"I eksperimentet bruger jeg 2 stk. BD140 i parallel. Det skal egentlig  

skuffe." - Findes ikke i Livewire :-)


morgenen, er en udfordring :-)

Jeg har netop modtaget trafoen, en ringkerne med 2 stk. 12Volt/13.75A  

http://www.hifituning24.de/transformatoren/ringkern_offen_se-rkt/330va-2x12v.php

Men hvorfor skiderikken har 8 ledninger ud (2 af hver farve), fatter jeg  
ikke - mon den reelt har fire 6Volt viklinger?






Karl Erik.


Re: Transistorer i parallel mm.
On 14-03-2014 00:11, Karl Erik Christensen wrote:

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Mvh Erik

Re: Transistorer i parallel mm.
Den 14-03-2014 01:05, Erik skrev:
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Der er som sagt 2 ledninger af hver farve.



Det betyder vel at 2 ledninger med samme farve skal samles?





Karl Erik.


Re: Transistorer i parallel mm.
On 13-03-2014 07:49, Ulrik Smed wrote:
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kun et stelpunkt i stjerneforbindelse.




at gu virker det.


mvh Erik

Re: Transistorer i parallel mm.
Den 14-03-2014 01:16, Erik skrev:
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god succes.




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Haha, ja, jeg bruger stort set kun simulering til aktive og passive  

ad. :)

--  
Ulrik Smed
Aarhus

Re: Transistorer i parallel mm.
Karl Erik Christensen wrote:
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Jeg ser to problemer i din opstilling:







udgangen. Reguleringens egetforbrug er ikke nok til at holde  

100mA hele tiden.




overkanten.


virtuelt nulpunkt. Der findes f.eks. LM317 der har et konstant  


/Lars

Re: Transistorer i parallel mm.
Den 13-03-2014 08:54, Lars Peter Larsen skrev:
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Du har fat i noget af det rigtige.



Men det er sikkert det lave tomgangsforbrug (LED diode), der er skyld i  



kun 2.5Volts forskel.

LM338K ikke overbelastes.









Karl Erik.


Re: Transistorer i parallel mm.
On 12/03/14 22.49, Karl Erik Christensen wrote:
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...


...

-

Hej Karl Erik





+-10 eller 20%.





For many circuits a ripple which is 10% of the supply voltage is  
satisfactory and the equation below gives the required value for the  
smoothing capacitor:
http://electronicsclub.info/powersupplies.htm#smoothing

http://www.zen22142.zen.co.uk/Design/dcpsu.htm
Citat: "...
For example a 12 VA rated transformer would have a no-load voltage which  
is 12% higher than the rated value. If the transformer was rated at 12 V  
@ 1 A, when measuring the secondary RMS voltage with a high impedance  
meter, you would measure approximately 13.44 Volts.
..."

Det er mere effektivt at anvende to trafovindinger (fx to trafoer?) og  
kun to dioder til ensretning (nummer to tegning):
https://en.wikipedia.org/wiki/Rectifier#Full-wave_rectification



-



Her anvendes 21V AC:
http://www.agurk.dk/bjarke/Projects/PowerSupplyFET/13.8V%2040A%20Power%20Supply%20Schematic%20Prints.pdf
http://www.agurk.dk/bjarke/Projects/PowerSupplyFET/PowerSupplyFET.htm

18V AC:
http://ludens.cl/Electron/Ps20/Ps20.html

17V AC:
http://electronics-lab.com/projects/power/012/

/Glenn



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