Hi,
sorry Mark, why do not you TVICOL gave the specifications of the transformer?
this is not my project.
I expressed my free opinion.
Make sounder this PCBs from other members, maybe I do not understand the clearance.
I can not give you the specifications of the transformer, becouse this is a big responsibility.
TVICOL should give you.
sorry for soft-start, I confue with similar SGxx chip
regards
sorry Mark, why do not you TVICOL gave the specifications of the transformer?
this is not my project.
I expressed my free opinion.
Make sounder this PCBs from other members, maybe I do not understand the clearance.
I can not give you the specifications of the transformer, becouse this is a big responsibility.
TVICOL should give you.
sorry for soft-start, I confue with similar SGxx chip
regards
No one is expecting from you such a specification - please read carefully my post. But if you say that the wire is incorrect, please tell us what wire is correct in your opinion.
In fact, I'm going to prepare such a specification on my own. But since this is such a great responsibility, I'll wait until TVICOL publishes it. My specification will be just for my own use - I'm not an experienced SMPS designer as you guys are.
Mark
you worry too much, air is normally an excellent insulator with about 3000v/mm break down voltage, there are some industry margins, but this is DIY guys, 2mm is overkill
''re right, why I worry?....
just to clarify, on FR4 PCB VTR likely support, is not air-dielectric.
ok, I'll get a coffee🙂
best regards
just to clarify, on FR4 PCB VTR likely support, is not air-dielectric.
ok, I'll get a coffee🙂
best regards
Hi all,
To TVICOL.
I have nothing against you.🙂
I understand that you do not have experience to design specifications to the standard required.
(there is nothing wrong with that).
1-link 4 +4 should be achieved after the close (end of primary) (*)
2 - How many laps of mylar must be placed on each layer.
3-phase winding referred to the primary.
4 - in which pins engage first part of the primary.
5 - sense of windings (turns open) or turns Closed)
6-gap (if it must be done) this is important for the efficiency of the transformer.
7 - clearer picture of the various layers.
ok, I think it's not complicated to write this data (problem can be if you do not know).
if you want, I can help on some specific for transformer.
Regards
To TVICOL.
I have nothing against you.🙂
I understand that you do not have experience to design specifications to the standard required.
(there is nothing wrong with that).
1-link 4 +4 should be achieved after the close (end of primary) (*)
2 - How many laps of mylar must be placed on each layer.
3-phase winding referred to the primary.
4 - in which pins engage first part of the primary.
5 - sense of windings (turns open) or turns Closed)
6-gap (if it must be done) this is important for the efficiency of the transformer.
7 - clearer picture of the various layers.
ok, I think it's not complicated to write this data (problem can be if you do not know).
if you want, I can help on some specific for transformer.
Regards
Specs
Its Clear that this is a DIY project, not a commercial project.
* So any one assemble this supply must know this
* Also, If any one dont KNOW the saftey standards for transformer winding, or SMPS assembly, there is no need to build this SMPS.
* Any one, with basic knowledge, should KNOW the winding order, otherwise it will not work at all
* Mylar tape layers is two, as minimum , 4 layers will give 4KV Isolation
* For this supply, Vicol isolation method WILL work for this SMPS, but will NOT meet standards.(Also its SAFE)
thanks
Its Clear that this is a DIY project, not a commercial project.
* So any one assemble this supply must know this
* Also, If any one dont KNOW the saftey standards for transformer winding, or SMPS assembly, there is no need to build this SMPS.
* Any one, with basic knowledge, should KNOW the winding order, otherwise it will not work at all
* Mylar tape layers is two, as minimum , 4 layers will give 4KV Isolation
* For this supply, Vicol isolation method WILL work for this SMPS, but will NOT meet standards.(Also its SAFE)
thanks
AP@,
All your observations and critics are welcome and if these are pertinent we will address them and improve the design further.
Regards,
Tibi
All your observations and critics are welcome and if these are pertinent we will address them and improve the design further.
Regards,
Tibi
I put step-list only to realize the specification to be given to the company that builds the transformer. (drawing he did tibi is insignificant for the company).
(4 +4 link) should be wrapped after the end of the primary becouse in this position is not Bird the current output modulation. (PWM modulation is stronger when amplifier sounds).
output link is right above the secondary psu only when used with constant current or small PSU. (There is no better than "applications-note" from company to do the wrong things in practice)🙂
(4 +4 link) should be wrapped after the end of the primary becouse in this position is not Bird the current output modulation. (PWM modulation is stronger when amplifier sounds).
output link is right above the secondary psu only when used with constant current or small PSU. (There is no better than "applications-note" from company to do the wrong things in practice)🙂
ok, after lunch put the specifications of the transformer suit this PSU.
perhaps can be helpful to some.
also,put a method for adjusting the frequency of the PWM on the transformer.
Regards
perhaps can be helpful to some.
also,put a method for adjusting the frequency of the PWM on the transformer.
Regards
Thanks Tibi for the trafo specification. In fact it's not that difficult to prepare such a specification. I did it on my own. But in your specification there are three issues that should be corrected, clarified.
First, you use incorrect pin numbers. ETD49 bobbin has pin #1 in the left top corner, and the numbering goes counterclockwise. The pin numbers are even written on the top of the bobbin. Your numbering is "mirrored". It is not a problem if you wind the transformer on your own. But if you give this specification to a professional company, as a result you will get "mirrored" version of the transformer. Such a transformer cannot be used with the board you designed. So pin #10 on your drawing is actually pin #1, pin #20 is pin #11, and so on.... It means also that the pin numbers on the schematic are also incorrect. Do you see it?
Second, the primary winding consists of two parts. It means that you have to specify the end pin for the first part and the start pin of the second part. Since the whole primary winding is between (5,6) and (1,2) - corrected numbers, I suggest to use pin #4 as the "middle" pin. Please note that the "middle" pin has to be on the primary side and not on the secondary side (due to security issues).
Third, you forgot to mark beginning of each winding. It's very important.
AP2, can you clarify these two issues? They are not clear for me.
Mark
OK, I noticed that you marked beginning of each winding with a black dot. And it's done exactly as I would do it. So this is not a problem. You could just write it to the right of the drawing (AP2 also didn't noticed this).
So what is left to be corrected are pin numbering and the "middle" pin for the primary winding.
Even if the pin numbers are not written on the top of the bobbin, pin #1 is marked with a big triangle (other three are much smaller) - you can see in the bobbins datasheet.
Does AP2 mean that the second secondary windings (+/-15V) should be on top of all layers? It's hard to understand him 😉.
Mark
So what is left to be corrected are pin numbering and the "middle" pin for the primary winding.
Even if the pin numbers are not written on the top of the bobbin, pin #1 is marked with a big triangle (other three are much smaller) - you can see in the bobbins datasheet.
Does AP2 mean that the second secondary windings (+/-15V) should be on top of all layers? It's hard to understand him 😉.
Mark
EDIT: in case of double windings their beginning and end cannot be clearly identified with your drawing.
Can't the specification be provided in this form (I use corrected pin numbers - starting from 1 in the top-left corner - pin numbering goes counterclockwise):
1st half primary, pins 5,6 -> pin 4 - 12 turns,
1st half secondary (1), pins 11,12 -> pin 13 - 9 turns,
2nd half secondary (1), pin 13 -> pins 14,15 - 9 turns,
2nd half primary, pin 4 -> pins 1,2 - 12 turns,
1st half secondary (2), pin 20 -> pin 19 - 4 turns,
2nd half secondary (2), pin 18 -> pin 17 - 4 turns
PS: I assumed that secondary (2) winding is on top of all windings. Correct me if this is wrong.
Examples from e.g. Power Integrations are available - why can't you provide the specification in their format? Such a specification can be send to any manufacturer and they will not get any problems when making the trafo.
We are here discussing the transformer on 5-th subseqent page but 1 good drawing could explain everything.
Mark
Can't the specification be provided in this form (I use corrected pin numbers - starting from 1 in the top-left corner - pin numbering goes counterclockwise):
1st half primary, pins 5,6 -> pin 4 - 12 turns,
1st half secondary (1), pins 11,12 -> pin 13 - 9 turns,
2nd half secondary (1), pin 13 -> pins 14,15 - 9 turns,
2nd half primary, pin 4 -> pins 1,2 - 12 turns,
1st half secondary (2), pin 20 -> pin 19 - 4 turns,
2nd half secondary (2), pin 18 -> pin 17 - 4 turns
PS: I assumed that secondary (2) winding is on top of all windings. Correct me if this is wrong.
Examples from e.g. Power Integrations are available - why can't you provide the specification in their format? Such a specification can be send to any manufacturer and they will not get any problems when making the trafo.
We are here discussing the transformer on 5-th subseqent page but 1 good drawing could explain everything.
Mark
Tank Mark for pins.
I not have layers connections from pcb.
What is the pin that connected from 1uF caps...(primary side)
I not have layers connections from pcb.
What is the pin that connected from 1uF caps...(primary side)
specifications for transformer is ready, missing only phase of primary turns, I need to know on what pin is connected to 1uF cap?
Yes
But please note that this is NOT any ordinary DIY where a schematic is shown
In which case only skilled would consider to build it
Its been stated that there will not be a schematic, only "commercial" boards to buy
And the designers obviously want people to buy, and build it
Its not just a DIY project
Such approach always attracts lesser skilled that it maybe shouldnt
Thats where the danger is
I still suggest any issues to be cleared
If it results in yet another redesign, so be it
Thats not my concern, only safety is
Any issues should be noted, right or wrong
Either way, argumentation should be relatively easy
You can quess it from my previous post. Primary winding starts at pins 5 and 6 (they are shorted on the board). And it ends on pins 1 and 2 (again shorted).
Pins 3,4,7,8,9,10 on the primary side are not connected.
Of course this is my numbering - originally pin 1 was numbered 10. I think we should use the "new" numbering - otherwise transformer making company wouldn't be able to manufacture the transformer.
Should the second secondary winding be on top of all windings?
Mark