luka said:
No, but that does look pretty kick-a$$. Nice pc boards, too. Silk-screened, double-sided & plated-thru, too.
Anyone come across it, please post it here.
Steve
Feedback
Luka
Yes I use a Lm358 in the feedback loop referenced to the postive
rail and it seems to be stable.
chas1
Luka
Yes I use a Lm358 in the feedback loop referenced to the postive
rail and it seems to be stable.
chas1
class d project
Luka & N-Channel
I sent an email to Michael Price the young man in the photo and he has responded that there is no pdf file only his notes and schematic, pcb layouts and other doc's which he is going to send me . They never got the HB power supply to work but the amp does work and is about 60 watts. I will keep all informed as I can use my supply with it.
chas1
Luka & N-Channel
I sent an email to Michael Price the young man in the photo and he has responded that there is no pdf file only his notes and schematic, pcb layouts and other doc's which he is going to send me . They never got the HB power supply to work but the amp does work and is about 60 watts. I will keep all informed as I can use my supply with it.
chas1
Hi
Thank you for sending him email, I searched all google and found nothing but the site that I gave.
It was a pdf file but anyone could make it, I just assumed he did had.
When you get the files, can you send them to me, I make PDF and post it here.
I liked this project because it had it all, the pfc, smps and amp, although something didn't work as I remember and now that you said.
Thank you for sending him email, I searched all google and found nothing but the site that I gave.
It was a pdf file but anyone could make it, I just assumed he did had.
When you get the files, can you send them to me, I make PDF and post it here.
I liked this project because it had it all, the pfc, smps and amp, although something didn't work as I remember and now that you said.
Luka & Chas1,
That would be great. I agree with Luka, PFC+SMPS+Amp. Not too eager to dive into the amp section yet- I'm just not ready to tackle another unfamiliar field yet, but the PFC & the SPMS main section, yes.
I wonder what the failure mode was for Michael's Power supply.
Hey Chas, Perhaps you could invite him to the forum.
This might facilitate all of our interacting with him.
Just a thought. (I have those from time-to-time.
)
Steve
That would be great. I agree with Luka, PFC+SMPS+Amp. Not too eager to dive into the amp section yet- I'm just not ready to tackle another unfamiliar field yet, but the PFC & the SPMS main section, yes.
I wonder what the failure mode was for Michael's Power supply.
Hey Chas, Perhaps you could invite him to the forum.
This might facilitate all of our interacting with him.Just a thought. (I have those from time-to-time.
)Steve
Thought
N-Channel
🙁 Done deal, I am upset because I didn't think of it after all this guy is MIT (student)
chas1
N-Channel
🙁 Done deal, I am upset because I didn't think of it after all this guy is MIT (student)
chas1
Yeah, that is a good idea. Since he is a student, this would open up a whole new arena and source of info for him to both give and receive.
Been to MIT. Impressive EE Program. Took part in an SAE-sponsored Consortium on 42V, but as 42V died a quiet death, so did the Consortium.
Been to MIT. Impressive EE Program. Took part in an SAE-sponsored Consortium on 42V, but as 42V died a quiet death, so did the Consortium.
If the 42V standard had taken hold, there would be more work in buck and step-down voltage converters and less in boost and step-up ones.
Good
Luka
Nice picture and I would be interested in how the test come out, also you mentioned with feedback. I would like to see the schematic or is it the same feedback that uses only the opto coupler with zener's.
chas1
Luka
Nice picture and I would be interested in how the test come out, also you mentioned with feedback. I would like to see the schematic or is it the same feedback that uses only the opto coupler with zener's.
chas1
Hi
I will try it with zener and opto just to see if it will work now, since there is none high freq. just a bit of primary side ripple. But in the end I think I will anyway end up with TL, because it is not difficult to change to different output voltage + you can have compensation. I don't have the board from the pic made yet, I have to think what else I would like to have on it like regulated voltage for op amps, fans...
Do I remember right when I say that your supply is working too?
I will try it with zener and opto just to see if it will work now, since there is none high freq. just a bit of primary side ripple. But in the end I think I will anyway end up with TL, because it is not difficult to change to different output voltage + you can have compensation. I don't have the board from the pic made yet, I have to think what else I would like to have on it like regulated voltage for op amps, fans...
Do I remember right when I say that your supply is working too?
w00t
Hi
This year christmas came earlyer than me and my friend thought.
Today we went to our local dealer of ferrites, and have got 10x ETD44(cores, bobbins and clips) and 2x T63, this are torroidal cores.
Here is pic of my share, other part is my friends.
Price you ask?
None!!! They are great....
Hi
This year christmas came earlyer than me and my friend thought.
Today we went to our local dealer of ferrites, and have got 10x ETD44(cores, bobbins and clips) and 2x T63, this are torroidal cores.
Here is pic of my share, other part is my friends.
Price you ask?
None!!! They are great....
Hi
Yesterday I tried smps with zener-opto FB and amp. They did "like" each other(must be the FB(unstable for use with amp))
But it did work great with no FB
So my qouestion is: is it better to have no FB for use with amp, or make good FB?
Yesterday I tried smps with zener-opto FB and amp. They did "like" each other(must be the FB(unstable for use with amp))
But it did work great with no FB
So my qouestion is: is it better to have no FB for use with amp, or make good FB?
feedback
Luka
There are high end commerical amps that do not use regulation in thier supplies, one that comes to mind is Crown. The key is does it supply the load requirement without any harmonic's or excessive noise and the distortion levels are within spec's. You might want to check the outputs with a low level pulse. I think I have your correct output circuit component value's, verify that this info is correct. Np = 35 turns, Ns = 7 turns each and Lo is 30 uh along with Co of 1000 uF on each rail or you using the (2) 2200 uF in each rail. I will design a feedback using a TL431 along with MC8102 that should be suitable. It will only monitor the postive rail but the outputs should be symmetrical. You can check the supply with and without the feedback.
chas1
Luka
There are high end commerical amps that do not use regulation in thier supplies, one that comes to mind is Crown. The key is does it supply the load requirement without any harmonic's or excessive noise and the distortion levels are within spec's. You might want to check the outputs with a low level pulse. I think I have your correct output circuit component value's, verify that this info is correct. Np = 35 turns, Ns = 7 turns each and Lo is 30 uh along with Co of 1000 uF on each rail or you using the (2) 2200 uF in each rail. I will design a feedback using a TL431 along with MC8102 that should be suitable. It will only monitor the postive rail but the outputs should be symmetrical. You can check the supply with and without the feedback.
chas1
Hi
Now I'm trying it with toroid core, looks very promising, but I would like to get rid of the spikes/oscilations as much as possible.
This is all on primary side so where do I start, what kind of snubber will a need?
This is still half-brigde, Vin is 32V, scope was set to 5v/div and 2us/div
This one is zoom in of bottom oscilation, osc set to 5v/div and 0.05us/div
Any suggestions?
Now I'm trying it with toroid core, looks very promising, but I would like to get rid of the spikes/oscilations as much as possible.
This is all on primary side so where do I start, what kind of snubber will a need?
This is still half-brigde, Vin is 32V, scope was set to 5v/div and 2us/div
This one is zoom in of bottom oscilation, osc set to 5v/div and 0.05us/div
Any suggestions?
Hi chas
Sorry I forgot to answer.
My final setup is Np=35, Ns=2x7, output choke is common mode and I measured each winding to have 20uH, don't know how big is in common mode, and four of 1000uF, two for each rail.
Sorry I forgot to answer.
My final setup is Np=35, Ns=2x7, output choke is common mode and I measured each winding to have 20uH, don't know how big is in common mode, and four of 1000uF, two for each rail.