UC3842 SMPS 500W

[Hepo]

In your list i don't see permeability.  But your parameter equal with "Al". Al = inductance factor and not equal with permeability.

I only found that PC40 material initial permeability is 2300 but its also not effective.

While i search info found next intresting:

and this article hb2009_ferroxcube.pdf

 

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[Nenad Grujic]

Can you please look this : http://www.lasfcy.com/pages/pro-tx-e.html

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[Nenad Grujic]

Yes you have right , flux density is 4700  and permeability is 2600  , need change that .

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[Hepo]

i ask one man in this forum about effective permeability and wait for answer.

its initial permeability and its 2300.

[Nenad Grujic]

Yes 2300 , my  type mistake   , sorry .
This is with new  setting for core calculation for half bridge  principle , that is ok now ?

[Nenad Grujic]

I m add IR2110 in circuit diagram , now will be usable for half bridge ?
How I can calculate C8 , have some rules for that , I know that  max current is limited with capacitor value  and frequency , it is same with high frequency ?
All so wan quest for Q1 and Q2  , some circuit have snubber on that FET , some one use  diode  and also some one not use nothing , what is the best options for long and stable work ?

 

[Hepo]

About С8 i don't have anough knowledge. about snubber for FET it's good to have it make life of FET more easy? so it's better to have.

About scheme. you need diod after R6. R9-R10 don't need with the connection to ground. It's make driver(2110).

Add resistor after 18V bridge about 100 Ohm

R13 about 100Ohm

Also you need to add something for charging power capacitors when smps turned on or you'l have great spark at power soket, and for capacitors it's not good.

Also for the first time when you "turn on" the smps good to connect in series the wolfram bulb it will limit the current if something go wrong.Something about 60W bulb.

If it light for some second that mean there something wrong with smps and you need to turn it off.

Also about frequency i heard that if it higher 60khz youl have great loses in swithing keys. so you need to talk some one whith greater knowledge than i.

 

 

[Nenad Grujic]

Hepo , today I m assembly smps   , circuit similar like  up circuit  , and I see that have  few not understandable problems .
First is that with R6 100 k not have enough power for run SG3525 and IR2110  , have only 2V , need recalculate  that resistor , but I not know how much is min, current  that I need have  for run FET  , that is for first run , when smps will be start then is plane use  power from transformers for run SG3525 and IR2110 ?

Second is , I m connect bulb  to transformers place ( primary side ) , and with firs measure that all look nice , but think that have problems  because FET will be  hot after few minute  ( current on testing is only 270 mA ) , have you idea what can fake me ?
I won measure all before put transformers that I m sure  that all work fine .

[UVV]

Этой схеме не хватает ограничение по мощности или тока по выходу.

[Nenad Grujic]

I m total confuse UVV , I m change frequency from 25 kHz to 80 kHz  , connect smps , and then is first blow me IR2110 , then all so FET-s and SG3525  and fast diode D3 , D4 .
On image have how look PWM signal on SG3525 output  , like we can see that have  enough delay between signal , and that  need be  enough for discharge Gate on FET and close FET .
Need say that  on transformers primary side I m connect bulb , not have transformers , and for that all is strange me .

 

 

[Yurkin2015]

@Nenad Grujic I've spotted a mistake in your smps diagram: the bottom end of the R9 should be connected to the Q1 source, not to the GND. Is that wrong connection implemented on your real smps board or is it just a misprint in the diagram?

Ne razumijem zašto se koristiti slova „I m”? Što oni znače?

[Falconist]

May be I'm (I am)?

[Nenad Grujic]

Yurkin2015 , I m need bee I am or  with ' but when type then not look and make type mistake , sorry for that .
I'm attach circuit diagram , this is with true value  , all so need say that  I'm not put transformers , on primary side I'm connect  bulb 60W .

SG3525-500W-SMPS.pdf

[Nenad Grujic]

Today I m run smps and  after few  second problems , first is damage diode D7 on secondary side (short connection between A1 and K  ) and after that is all so damage FET .
I not understand why is that happen because  before I m connect load then voltage on secondary side  after diode is be 28V and I m use MBR4045  , that is 45 V , all so current is with 3R  something like 9.6A  but  diode is 40A , can some one explain me why  that is happen ?
Transformers is EE42/21/15 core  with 4x0.5 mm wire on primary side , 19 turn , secondary is  2x5 turn  with 5x0.8 mm wire , for supply PWM module I m use 1x0.5 mm wire , 4 turn .
Frequency is now 87 kHz with 1.5 uS duty time .
 

[o_l_e_g]

24 минуты назад, Nenad Grujic сказал:

I not understand why is that happen because  before I m connect load then voltage on secondary side  after diode is be 28V and I m use MBR4045  , that is 45 V , all so current is with 3R  something like 9.6A  but  diode is 40A , can some one explain me why  that is happen ?

В полумосте (half-bridge), к диоду прикладывается удвоенное обратное напряжение.  28*2> 45
 

[Falconist]

This circuit is unable to stabilize the output voltage without an output inductor. I told this earlier some times.

[Hepo]

For the first as say falconist you need power choke at the output(inductance calculated in program)

Also Shotky barier you need no less 67V(you have 45v) With your parameters it maybe little else(programm callculate it also)

 

[o_l_e_g]

На такие напряжения, применять Шоттки  уже не  целесообразно.  Ставятся на напряжение 150-200 В обычные импульсные, учитывая короткие импульсы перенапряжения при переходных процессах.

 

PS Также, будет не лишним зашунтировать диоды снабберными цепочками.
 

[Hepo]

Ну  с тобой не согласятся производители как минимум 90% БП к ПК. Почти в любом блоке стоят Шотки 30100(30А 100В по шине 12В) Достать не так уж и сложно, да и цена на них не высокая.

[Nenad Grujic]

Hero , I have few supply for PC and  all diode is 4045 or 3040  no one is 30100 or 40100 , tomorrow I will try found it  or I will buy new .
I'm little look  what is problems and have  few question , on HB supply  frequency on secondary side is 2x frequency  on one FET , my frequency is 87kHz  and  then on diode  174 kHz frequency , that is right ?
Can not found information  what is max frequency for MBR 3040 or similar diode  , can you give me that info , or  max time for close diode ?
On my  smps not have storage inductor , and now see that is big mistake , I will add it , how I can calculate it ?
I m see that on my smps in diode ( 2 diode in one package ) only is damage A1 to K  and every time A2 is ok , have some reason for that ?

 

[o_l_e_g]

36 минут назад, Hepo сказал:

шине 12В

А тут, 28 В ! На 200В Шоттки уже экзотика.
 

[Nenad Grujic]

o_l_e_g , I think that 100V will be ok ?
I have use some old version software for transformers calculation and then is not write me  pik voltage  , that is ExcellentIT 7100  , but after I m see when click to  secondary voltage information then write me all so pik voltage , that is 46.8V , for that I think that 100V diode will be nice  , what you think ?

 

[Falanger]

Судя по фотографиям , печатка очень "кривая" - от ir2110 к истокам и затворам ключей , подходят длинющие дорожки , но зато красиво  .

Даташит читают только трУсы!(с)

[o_l_e_g]

9 часов назад, Nenad Grujic сказал:

I think that 100V will be ok ?

Мало! Для выпрямителя полумоста, берутся диоды с 4-5 кратным запасом. Как говорилось раньше, к примеру,  в 12 В канале блока питания компьютера стоят диоды на 80-100 В, в сварочном аппарате, при напряжении хх 40-70В , стоят  диоды на 400 В.
 

[Hepo]

@o_l_e_g Не путайте человека. Напряжения для выходных диодах меряется не иксами с н-запасом. А вполне обусловлеными расчетами. При этом программа напрямую говорит на какое напряжение ставить диод.

Скрытый текст

 

23 часа назад, Nenad Grujic сказал:

frequency for MBR

It's Shotky diode, it don't have time to switch, only capacity.

23 часа назад, Nenad Grujic сказал:

only is damage A1 to K

unfortunately i don't know why it is.

13 часа назад, o_l_e_g сказал:

в сварочном аппарате, при напряжении хх 40-70В , стоят  диоды на 400 В

Тут картина как раз наоборот, В сварочниках чаще ставят обычные диоды в паралель поскольку на токи сварочника проще поставить пачку обычных чем искать шотки на такие токи.