Opto-couplers in smps - part 3 (final chapter)

[Henry Kiefer]

|
|
| Rich Grise wrote:
|
| > I have not yet met an ISP who doesn't provide a web page for each of
| > their customers.
|
| My current ISP doesn't. They just provide first class connectivity and a mail server.

If it is true first class connectivity, then you can run your own server at home.

- Henry

 

[Eeyore]

| Rich Grise wrote:
|
| > I have not yet met an ISP who doesn't provide a web page for each of
| > their customers.
|
| My current ISP doesn't. They just provide first class connectivity and a mail server.

If it is true first class connectivity, then you can run your own server at home.

You can but it's far simpler ( for the time being at least ) to use theirs.

Graham

 

[Steve]

thats even better. ignore my previous post then.

Cheers
Terry- Dölj citerad text -

- Visa citerad text -

Hi Terry!

http://www.etanoldax.se/smps1.JPG

This link will bring you a very simplified circuit diagram made in
pure windows paint (!!)
It will give you information about power circuit gain and compensation
bits included in the loop.
My aim was to include a "double zero" at filter resonance to cancel
the phase shift caused by the LC filter.
The filter has a resonance frequency of 125Hz, I put a double zero at
153Hz.
Unfortunately I'm unaware of the ESR in the output caps. I noticed, if
it's between 50-100 mOhms, a very nice zero is introduced
which make things even better.
As I mentioned, I aim for a loop response unity gain frequency of
3kHz.
I'll be most greatful if you go through my circuit step by step to
determine loop compensation stuff.
This will be very teaching for me!

I appreciate your time and kindness in learning me this tricky things!

Regards
Stefan

 

[krw]

You can but it's far simpler ( for the time being at least ) to use theirs.

Dumb donkey, you just said they didn't support user web pages.
Sheesh!

 

[Eeyore]

[email protected] says...

Dumb donkey, you just said they didn't support user web pages.
Sheesh!

Since when is a mail server anything to do with use webspace ?

Graham

 

[Andrew Edge]

Hi Terry!

http://www.etanoldax.se/smps1.JPG

This link will bring you a very simplified circuit diagram made in
pure windows paint (!!)
It will give you information about power circuit gain and compensation
bits included in the loop.
My aim was to include a "double zero" at filter resonance to cancel
the phase shift caused by the LC filter.
The filter has a resonance frequency of 125Hz, I put a double zero at
153Hz.
Unfortunately I'm unaware of the ESR in the output caps. I noticed, if
it's between 50-100 mOhms, a very nice zero is introduced
which make things even better.
As I mentioned, I aim for a loop response unity gain frequency of
3kHz.
I'll be most greatful if you go through my circuit step by step to
determine loop compensation stuff.
This will be very teaching for me!

I appreciate your time and kindness in learning me this tricky things!

Regards
Stefan

Hi .
To be a real help we need all the values of the components.
They are some component values that are missing. Resistors, capacitors
and looks like a zener .

Andy

 

[Terry Given]

Hi .
To be a real help we need all the values of the components.
They are some component values that are missing. Resistors, capacitors
and looks like a zener .

Andy

the zener is OK. but the other side of the opto isnt there at all, and
both the zener feed resistor (so we can figure out if it can support the
opto current) and the opto LED resistor are pretty important. Rbias is
irrelevant.

As a general comment, it is common to provide the TL431 bias current by
placing a resistor across the LED. Choose it such that the maximum TL431
bias current almost forward-biases the LED (at the maximum temperature).

for a TL431 its about 1mA, which is going to dump 88mW in the zener
resistor. Then there is the opto current, which is probably a lot more
than 1mA (no way to work it out without the transistor-side circuitry).

Stefan, the basic circuit looks OK (apart from the aforementioned
things), you're certainly on the right track. you just have to include
the entire opto & SG2525 error-amp circuitry in your calcs.


BTW voltage mode is not really the best technique; current mode is
almost always better. It automatically has phenomenal line rejection,
which works on a cycle-by-cycle basis, and of course inherently has peak
primary power limiting. And it magically deals with staircase
saturation, startup issues etc.


Cheers
Terry

 

[krw]

Since when is a mail server anything to do with use webspace ?

The dumb donkey can't read. Hint from above: "I have not yet met
an ISP who doesn't provide a web page..." There is nothing in this
threadlet about mail servers.

 

[Eeyore]

[email protected] says...

The dumb donkey can't read. Hint from above: "I have not yet met
an ISP who doesn't provide a web page..."

And I said previously " They just provide first class connectivity and a mail server."

There is nothing in this threadlet about mail servers.

I suggest you learn to read.

Graham

 

[krw]

And I said previously " They just provide first class connectivity and a mail server."

Dumb donkey still can't read. The particular discussion *was*
about web servers.

I suggest you learn to read.

Dumb donkey still cant read after the obvious has been put right
under his stupid nose.

 

[Steve]

the zener is OK. but the other side of the opto isnt there at all, and
both the zener feed resistor (so we can figure out if it can support the
opto current) and the opto LED resistor are pretty important. Rbias is
irrelevant.

As a general comment, it is common to provide the TL431 bias current by
placing a resistor across the LED. Choose it such that the maximum TL431
bias current almost forward-biases the LED (at the maximum temperature).

for a TL431 its about 1mA, which is going to dump 88mW in the zener
resistor. Then there is the opto current, which is probably a lot more
than 1mA (no way to work it out without the transistor-side circuitry).

Stefan, the basic circuit looks OK (apart from the aforementioned
things), you're certainly on the right track. you just have to include
the entire opto & SG2525 error-amp circuitry in your calcs.

BTW voltage mode is not really the best technique; current mode is
almost always better. It automatically has phenomenal line rejection,
which works on a cycle-by-cycle basis, and of course inherently has peak
primary power limiting. And it magically deals with staircase
saturation, startup issues etc.

Cheers
Terry- Dölj citerad text -

- Visa citerad text -

Terry,

I've uploaded an improved schematic.
All components are now given a value, including "primary" side opto
circuit and 2525 internal error amp, though is used only as a buffer.

Best regards
Stefan

 

[Eeyore]

I've uploaded an improved schematic.
All components are now given a value, including "primary" side opto
circuit and 2525 internal error amp, though is used only as a buffer.

Can anyone else take a peek ?

Graham

 

[Eeyore]

[email protected] says...

Dumb donkey still can't read. The particular discussion *was*
about web servers.

I was indeed responding to the comment " I have not yet met an ISP who doesn't provide a web page for
each of their customers."

Dumb donkey still cant read after the obvious has been put right
under his stupid nose.

Are you blind or something ?

Graham

 

[krw]

I was indeed responding to the comment " I have not yet met an ISP who doesn't provide a web page for
each of their customers."

Dumb donkey...

The original post (with some line wraps and a leading space to
eliminate the auto-quotation) I replied to:

| Rich Grise wrote:
|
| > I have not yet met an ISP who doesn't provide a web page

for each of their customers.

Grease indicates that he had never seen an ISP without web service
bundled. Ok, so far?

| My current ISP doesn't. They just provide first class

connectivity and a mail server.

Dumb donkey says his ISP has no web service included.

If it is true first class connectivity, then you can run
your own server at home.

HenryK says that if it was such a great ISP you could run your own
web server.

You can but it's far simpler ( for the time being at least )
to use theirs.

Dumber-than-Dirt Donkey says that it's far simpler to use theirs,
which he just said in a reply above, didn't exist.

Get it now Dufus Donkey? Good, you can stop running from yourself
now.

Are you blind or something ?

Someone is, but he ain't on this side of the great pond.

 

[Terry Given]

Steve wrote:




Can anyone else take a peek ?

Graham

yes, but they'll have to have some degree of reading comprehension in
order to do so

Cheers
Terry

 

[Henry Kiefer]

[...]

It is really such simple to run a selfowned webserver. At least for simple HTTP. You don't need honkey-donkey SAMBA or Apache.
Updating your webspace is much simpler then. Just drag the files to the webroot directory and it is online. No ftp needed.

Try www.aidex.de It is free, small, effective. Forgive me if it is german language.
A bigger candidate is Abyss Web Server - even free and english spoken.

But you need a 24/7 online for best results and dyndns update if your IP changes. Also free.

All free and no commercial breaks - great, isn't it??

- Henry

 

[Eeyore]

[email protected] says...
each of their customers."

Dumb donkey...

Dumb KRW.

The original post (with some line wraps and a leading space to
eliminate the auto-quotation) I replied to:


for each of their customers.

Grease indicates that he had never seen an ISP without web service
bundled. Ok, so far?

Absolutely fine.

connectivity and a mail server.

Dumb donkey says his ISP has no web service included.

Dumb KRW has it right so far.

HenryK says that if it was such a great ISP you could run your own
web server.

Absolutely wrong. He said server without specifying web or mail.

You can but it's far simpler ( for the time being at least )
to use theirs.

Dumber-than-Dirt Donkey says that it's far simpler to use theirs,
which he just said in a reply above, didn't exist.

To use their mail server rather than set up your own.

Get it now Dufus Donkey? Good, you can stop running from yourself
now.

I get it that you're incapable of understand what's in front of your nose.

Now grow up !

Graham

 

[jasen]

Organization: Slingshot Internet
NNTP-Posting-Host: news.tranzpeer.net
X-Complaints-To: [email protected]

can you email it to me? my crappy ISP wont let me see ABSE, and Im way
too lazy to figure out any other way of doing it. you can deduce my
email from the post

If you ever feel like switching ISPs, Clear carries it.

Bye.
Jasen

 

[krw]

Dumb KRW.

How original. Considering the source...

Absolutely fine.

As is the rest.

Dumb KRW has it right so far.

Even the part about "dumb donkey".

Absolutely wrong. He said server without specifying web or mail.

Dumber-than-dirt donkey, the context from above was a WEB SERVER.
Why bother quoting if you can't read them?

To use their mail server rather than set up your own.

The issue at hand was WEB SERVERS. You stepped in your own dirt,
dumb donkey.

I get it that you're incapable of understand what's in front of your nose.

You're incapable of reading, even when when I lay it out in front
of your stupid stubborn donkey nose.

Now grow up !

Now learn to read.

 

[Eeyore]

[email protected] says...

You're incapable of reading, even when when I lay it out in front
of your stupid stubborn donkey nose.

Nerr, nerr, nerr. I said that first.

Graham