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Old 15th June 2004, 07:24 PM   #1
DFI is offline DFI  Romania
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Default Need help on car SMPS

Can anyone plz help me by telling me if the attached schematic is going to work ? Thanks.
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File Type: zip switch mode power supply for car amplifiers.zip (36.0 KB, 209 views)
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Old 16th June 2004, 05:10 AM   #2
Tensop is offline Tensop  Lebanon
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jesus.
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Old 16th June 2004, 06:59 AM   #3
emre is offline emre  Turkey
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Hi DFI,

It is not possible to tell if the SMPS is going to work or not by just checking the schematic, the PCB layout is quite critical too. So, I guess the only way to tell if this is going to work is to build the circuit and test it!

If you want to check the basic circuit (i.e. switching characteristics, loop stability) , I can recommend you to use Spice for circuit analysis( like LTspice, make a search on google).

Regards,

Emre
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Old 16th June 2004, 02:10 PM   #4
DFI is offline DFI  Romania
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Thanks emre for the tip.
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Old 16th June 2004, 06:43 PM   #5
DFI is offline DFI  Romania
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One more question. Knowing that the MOSFETs are IRF 1405, how much power can I achieve from this power supply ??
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Old 17th June 2004, 12:29 PM   #6
Tensop is offline Tensop  Lebanon
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the limits wont be in the mosfets. more likely the toroidal transformer and/or (if used) output inductors
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Old 17th June 2004, 02:07 PM   #7
sss is offline sss  Israel
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DFI :


man u are crazy
u are using 10 pairs of irf1405 ??? those are rated at 169A each
3 pairs will be enough for 500W smps
u cant just add million paralelled transistors to get more power , u gotta use 2 or more transformers if u really want to make a 2000KW + amp , is this what u are trying to do ???

plus :
i didnt check all the schematic but u allready got a serious problem !!
this is not the right way to connect the base transistors to the power mosfets !!!
R10 to R18 should be connected to the emmiters of Q9 and Q10 and not to each other !!
and Q9, Q10 , Q31 , Q32 should have emmiter resistors .

i guess there are more things wrong with this schematic , u better look at other circuits to see how its done

cheers

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Old 17th June 2004, 02:50 PM   #8
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parts will cost more than buying an amp premade....
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Old 17th June 2004, 03:15 PM   #9
sss is offline sss  Israel
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Quote:
Originally posted by SkinnyBoy
parts will cost more than buying an amp premade....
if u are doing it the wrong way.......
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Old 17th June 2004, 03:18 PM   #10
DFI is offline DFI  Romania
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thanks sss for the reply. can you draw a little schematic on how to connect those resistors pls so I can understand better? I would appreciate your help.

Tensop, I am planning on using two toroids R 80/40/15 which you can find at http://www.kaschke.de/english/frames...ringkerne.html

SkinnyBo, that is not the problem. Maybe where you live the assembled amplifiers are much cheaper, but here in Romania they are very expensive. For example, a 300W RMS amp is no less than $200, and the parts here cost me about $300 and I get to have a much more powerful amp than I can buy with those money.
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