Hi All...
I Want to build a power supply to Car amp. i Need the supply in the end 40V +/- of 15A.
now i build all the circuit but i the transformer i want to build to.
how can i do that.
*that direction of winding is matter??
*what the size of the wire in need to winding in the transformer
i need to put in the input and that the output i need to put to get a 15A of 40V + -. thanks !
the circuit is build from 12Xirfz44 (6 for side). it is good?
thanks.
Tamir
I Want to build a power supply to Car amp. i Need the supply in the end 40V +/- of 15A.
now i build all the circuit but i the transformer i want to build to.
how can i do that.
*that direction of winding is matter??
*what the size of the wire in need to winding in the transformer
i need to put in the input and that the output i need to put to get a 15A of 40V + -. thanks !
the circuit is build from 12Xirfz44 (6 for side). it is good?
thanks.
Tamir
Commentable Thoughts
Hey DJ I only know how to fabricate low frequency 20-400Hz E-I Iron Core Transformers not high frequency ferrites.
If interested mail me!
A+m+p+m+a+n =?????
Hey DJ I only know how to fabricate low frequency 20-400Hz E-I Iron Core Transformers not high frequency ferrites.
If interested mail me!
A+m+p+m+a+n =?????
Hi DJ!
I think without schematic of your SMPS it will be hard to give
suitful hints.
My proposal:
Put the schematic and hope that EVA is in the right mood! 😀
Cheers
Markus
I think without schematic of your SMPS it will be hard to give
suitful hints.
My proposal:
Put the schematic and hope that EVA is in the right mood! 😀
Cheers
Markus
As far as I can see you must partially take care about the winding polarity of the windings.
The polarity of both primaries must match together
and
the ploarity of both secondaries must match together.
My proposal. Wind the transformer always with the same
direction of rotation. The points at the winding in the schematic
will mark the starting of the windings.
Polarity of primary to secondary should not be important in this design.
Transformer design does not require an airgap, from my understanding.
The size of the core depends very much on the used frequency.
Sorry I did not find time to check all details of the schematic
and find out the frequency....
The turns ratio is identical to the voltage ratio.
The absolute number of required turns can be determined by the voltage time product and the core geometry.
U x ton = N x deltaB x A
As an example:
operating frequency: 30kHz , ==> T=33us, ton = 16.7us
material: ferrite N67, suitable for +/- 250mT in this application and frequency (I think so, but NOT rechecked with data book...)
cross section area of the ferrite: i.e. 100mm^2
In this push pull circuit you will always switch 12V to the primaries
and the flux may run between +/-250mT ==> deltaB=500mT
N = (U x ton) / (deltaB x A)
Please take care for the units:
1mm^2 = 1E-6 m^2
1mT = 0.001T etc....
For the primaries this means
N = at least 4 turns in this example.
The wires should be suitable multistrand HF-litz.
0.1mm strands are popular and should give acceptable results
up to 100kHz in an ungapped design.
.....Eva? Where are you?
Please jump in and help, if you see mistakes or feel
that more details are required by DJ.
Bye
Markus
The polarity of both primaries must match together
and
the ploarity of both secondaries must match together.
My proposal. Wind the transformer always with the same
direction of rotation. The points at the winding in the schematic
will mark the starting of the windings.
Polarity of primary to secondary should not be important in this design.
Transformer design does not require an airgap, from my understanding.
The size of the core depends very much on the used frequency.
Sorry I did not find time to check all details of the schematic
and find out the frequency....
The turns ratio is identical to the voltage ratio.
The absolute number of required turns can be determined by the voltage time product and the core geometry.
U x ton = N x deltaB x A
As an example:
operating frequency: 30kHz , ==> T=33us, ton = 16.7us
material: ferrite N67, suitable for +/- 250mT in this application and frequency (I think so, but NOT rechecked with data book...)
cross section area of the ferrite: i.e. 100mm^2
In this push pull circuit you will always switch 12V to the primaries
and the flux may run between +/-250mT ==> deltaB=500mT
N = (U x ton) / (deltaB x A)
Please take care for the units:
1mm^2 = 1E-6 m^2
1mT = 0.001T etc....
For the primaries this means
N = at least 4 turns in this example.
The wires should be suitable multistrand HF-litz.
0.1mm strands are popular and should give acceptable results
up to 100kHz in an ungapped design.
.....Eva? Where are you?
Please jump in and help, if you see mistakes or feel
that more details are required by DJ.
Bye
Markus
Hello DJ bass and Chocoholic.
Just to put my fingerprint on this, i have seen 1 milimeter diameter wires on that kind of transformer. Also i now this special wire you told chocoholic, the one that is strong and is mixed with other non conductive fibers...maybe silk fibers or cotton fibers.
I also like when Eva appear. She is clear, direct and have deep knowledge... and wonderfull nails too!.
My wife is from Spain.... people there has a very strong personality.
You are talking in ferrite... unfortunattely whe do not use them in audio transformers (do not know why), also they not use E shape plates, is another assembling that is more adequated to audio.
When Israel ligths goes down, lamps became yellow, may be Mr. Dj Bass testing something!
regards,
Carlos....HELLO EVA, HELP US!
Just to put my fingerprint on this, i have seen 1 milimeter diameter wires on that kind of transformer. Also i now this special wire you told chocoholic, the one that is strong and is mixed with other non conductive fibers...maybe silk fibers or cotton fibers.
I also like when Eva appear. She is clear, direct and have deep knowledge... and wonderfull nails too!.
My wife is from Spain.... people there has a very strong personality.
You are talking in ferrite... unfortunattely whe do not use them in audio transformers (do not know why), also they not use E shape plates, is another assembling that is more adequated to audio.
When Israel ligths goes down, lamps became yellow, may be Mr. Dj Bass testing something!
regards,
Carlos....HELLO EVA, HELP US!
This shcematic is intended to oscillate at 150Hz [300Hz osc] to be used with a standard or custom designed 50Hz transformer. For high frequency SMPS I think there is a lot of info in the other SMPS thread
I see no point in mantaining two threads about the same topic at the same time
I see no point in mantaining two threads about the same topic at the same time
OK, not in the right mood? 
Uhps 150Hz....
Yes Eva is right,.. Ct is large (100nF) and Rt high (56kOhms).
This determines the low oscillator frequency.
Then forget all my HF-proposals like ferrite and HF-litz.
A 50Hz iron core will do it. Massive wire is also fine for our
low power. (At 50Hz, splitting the strands or "Roebeling" is only required at very high power , above 10kW)
But the core size will be big!!
If you want +/-40V and 15A (1.2kW) at 150Hz, then a core size
of a normal 750W/50Hz transformer should be fine, as given
in your schematic.
The points about winding direction and # of turns are
also valid at low frequencies....
My feeling about a SMPS for car Audio at 150Hz?
Well, big & heavy, not state of the art..
But less difficult than a high frequency design.
If you dare to do a HF design, you should really have a look to the thread which Eva mentioned.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=30183
Another link which might help you
http://sound.westhost.com/project89.htm
Cheers
Markus
P.S.
Hi Eva,
...charming comment...
But, well I must admit...
I was lazy and your expertise seemed to be the perfect solution...
Uhps 150Hz....
Yes Eva is right,.. Ct is large (100nF) and Rt high (56kOhms).
This determines the low oscillator frequency.
Then forget all my HF-proposals like ferrite and HF-litz.
A 50Hz iron core will do it. Massive wire is also fine for our
low power. (At 50Hz, splitting the strands or "Roebeling" is only required at very high power , above 10kW)
But the core size will be big!!
If you want +/-40V and 15A (1.2kW) at 150Hz, then a core size
of a normal 750W/50Hz transformer should be fine, as given
in your schematic.
The points about winding direction and # of turns are
also valid at low frequencies....
My feeling about a SMPS for car Audio at 150Hz?
Well, big & heavy, not state of the art..
But less difficult than a high frequency design.
If you dare to do a HF design, you should really have a look to the thread which Eva mentioned.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=30183
Another link which might help you
http://sound.westhost.com/project89.htm
Cheers
Markus
P.S.
Hi Eva,
...charming comment...
But, well I must admit...
I was lazy and your expertise seemed to be the perfect solution...
Another hint:
If you use a 50Hz iron core you can go for higher flux densities.
But I would prefer to be careful.
I would expect that the circuit will fail if the core runs into saturation!
Saturation will happen above approx. 1T for normal iron cores.
But you should not try to use that full swing of +/- 1T in this design, because of two reasons:
1. The core losses are fine at 50Hz, but at 150 Hz they will be much higher (overproportional)
2. During start up the core will start from 0T and then the
core can easily run into saturation.
My proposal would be to run the core at +/-400mT nominal.
==> deltaB = 800mT= 0.8T.
This should be save for start up and also for a non stable battery
voltage.....
Bye
Markus
If you use a 50Hz iron core you can go for higher flux densities.
But I would prefer to be careful.
I would expect that the circuit will fail if the core runs into saturation!
Saturation will happen above approx. 1T for normal iron cores.
But you should not try to use that full swing of +/- 1T in this design, because of two reasons:
1. The core losses are fine at 50Hz, but at 150 Hz they will be much higher (overproportional)
2. During start up the core will start from 0T and then the
core can easily run into saturation.
My proposal would be to run the core at +/-400mT nominal.
==> deltaB = 800mT= 0.8T.
This should be save for start up and also for a non stable battery
voltage.....
Bye
Markus
fancy SG3525!
Wow!
The SG3525 features a slow ramp up of the MosFet signals.
So you will probably have no issues with saturation during
turn on....
Wow!
The SG3525 features a slow ramp up of the MosFet signals.
So you will probably have no issues with saturation during
turn on....
Hello Dj Bass
Shalom my friend.
Can i see the schematics you are using to car amplifier.
My idea is if you use 20 amplifiers, each one 70 watts RMS, each one into a cheap 6 inches woffer (100 watts, hi compliance) you will have more power than a single
1400 watts RMS amplifier with one 15 inches incredible speaker.
Because you will have more "piston" area pumping air into your ears (they can be damaged!)
But i was reading you, and i know you are a powerholic....or a power needed person, i ask you to think about this matter... that is simple to understand....but my tired neuroniuns delay a lot to capture that idea... i see it clearly in my mind.... no doubts about that.
If someone with higher knowledge degree or respectability appear and said to me ... you are wrong Carlos..... i will not discuss because i am sure... in respect to them i will silence but i will not test this again and not try to prove this idea....but no one will appear to say that... our teachers are competent.
I have a question to you.... post it directly to me:
Don't you think this long figth to desert land is something out of purpose.... let me here your idea please....i really think is better to move and left the sand for the other side.... if they want nothing materialy valuable... take it!... and then negociate another place.... with thousand miles distance from them... is because is ancestral land.... religion is the reason...please... tell me what you think... i have special simpathy with Jewish people... wan't do learn and understand...please!..be my teacher for a while..... put it directly...not here.
nanabrother@yahoo.com
Carlos
Shalom my friend.
Can i see the schematics you are using to car amplifier.
My idea is if you use 20 amplifiers, each one 70 watts RMS, each one into a cheap 6 inches woffer (100 watts, hi compliance) you will have more power than a single
1400 watts RMS amplifier with one 15 inches incredible speaker.
Because you will have more "piston" area pumping air into your ears (they can be damaged!)
But i was reading you, and i know you are a powerholic....or a power needed person, i ask you to think about this matter... that is simple to understand....but my tired neuroniuns delay a lot to capture that idea... i see it clearly in my mind.... no doubts about that.
If someone with higher knowledge degree or respectability appear and said to me ... you are wrong Carlos..... i will not discuss because i am sure... in respect to them i will silence but i will not test this again and not try to prove this idea....but no one will appear to say that... our teachers are competent.
I have a question to you.... post it directly to me:
Don't you think this long figth to desert land is something out of purpose.... let me here your idea please....i really think is better to move and left the sand for the other side.... if they want nothing materialy valuable... take it!... and then negociate another place.... with thousand miles distance from them... is because is ancestral land.... religion is the reason...please... tell me what you think... i have special simpathy with Jewish people... wan't do learn and understand...please!..be my teacher for a while..... put it directly...not here.
nanabrother@yahoo.com
Carlos
shalom ! 😀
becuse i fix a old AMPLIFIER of pyrmid PB-1480
very old and i fix his power supply. i and i make him stable i 1 ohm in bridge to my car subwoofer.
pic soon !! if u want ! of the inside of the amp.
MY SUBWOOFER : 4X450WRMS of 12' any one.
TAMIR
becuse i fix a old AMPLIFIER of pyrmid PB-1480
very old and i fix his power supply. i and i make him stable i 1 ohm in bridge to my car subwoofer.
pic soon !! if u want ! of the inside of the amp.
MY SUBWOOFER : 4X450WRMS of 12' any one.
An externally hosted image should be here but it was not working when we last tested it.
TAMIR
Wonderfull tamir.... real pretty!
I like them very much... is this metal cone?.... or is a thin chromiun layer over an copper material added to paper or plastic speaker cone?
Real pretty... as mirrors... and if metal will not deformated when strongly overdriving... also a little bit heavy will loose perfect control on bass..... the way i like the bass... something that reduce the frequency just a little.... not too much....but a little deeper and continuous looooooooong bass.
Carlos
I like them very much... is this metal cone?.... or is a thin chromiun layer over an copper material added to paper or plastic speaker cone?
Real pretty... as mirrors... and if metal will not deformated when strongly overdriving... also a little bit heavy will loose perfect control on bass..... the way i like the bass... something that reduce the frequency just a little.... not too much....but a little deeper and continuous looooooooong bass.
Carlos
Hi amp man
Amazing results, constant output power, no overheat, now you got to help us here, I don't know the dimensions of your E-I iron, from where did you get it anyway.
What wire gauge did you use,and why did you use the 3.5mF capacitor on the secondary directly,and how did you wind your transformer.
Now if I bring an old 5 Amp 48 volt ordinary mains transformer, can I use it, if so, are the number of windings still the same, and what wire gauge should I use,and how many total mosfets should I use, I mean how much power can I obtain from it.
BTW, how should I wind the transformer,there is a plastic core for the primary,and another one for the secondary,should I wind the primary in clockwise and the secondary in counter-clockwise for example,or both of them in clockwise.
Thanks
__________________
Amazing results, constant output power, no overheat, now you got to help us here, I don't know the dimensions of your E-I iron, from where did you get it anyway.
What wire gauge did you use,and why did you use the 3.5mF capacitor on the secondary directly,and how did you wind your transformer.
Now if I bring an old 5 Amp 48 volt ordinary mains transformer, can I use it, if so, are the number of windings still the same, and what wire gauge should I use,and how many total mosfets should I use, I mean how much power can I obtain from it.
BTW, how should I wind the transformer,there is a plastic core for the primary,and another one for the secondary,should I wind the primary in clockwise and the secondary in counter-clockwise for example,or both of them in clockwise.
Thanks
__________________
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