This video does not explain the principle, so I will try to explain one: This is NOT a buck converter, there is no inductor here. This is using Push-Pull Half Bridge topology using IC SG3525 that is widely available. This IC responsibles for generating Inverting and Non-inverting alternating PWM output for those two MOSFETs on heatsink. The two MOSFETs responsible for delivering the "push & pull" current for in the transformer. The transformer is using turn ratio of 0.375. Using transformer at "full duty cycle" the output voltage is input voltage times 0.375. For example, if the input is 72V then the output will be around ~26V (this is if both the MOSFETs have ~50% duty cycle). The output is then put on feedback into the inverting pin No. 2 of the IC. The duty cycle adjustment (shown in oscilloscope in this video) is only for one channel while the other channel is kept near 50% duty cycle. If the input is 72V with the "full operating" you get output of ~26V but if the duty cycle of one channel is reduced to around 23% instead of 50% of it then you get roughly 12V in output. The blue mini-trimpod that you see is for this duty cycle adjustment. By the look of the MOSFET chosen IRF512, this can only handle at maximum 8A (4A for each MOSFET). Ideally this should only be used for 5A or less continuously and with additional fan. Based on the transformer ratio 0.375 the minimum input voltage should be 1/0.375 x 12 = 32V. Input for lower than 32V will not be able to reach 12V output (it will output less). Note that there is a difference in winding of the transformer. The push-pull topology is using transformer winding that is slightly different than the typical transformer. And unfortunately it is not shown in the video. Note that there are THREE terminals on push-pull in primary side of transformer and are connected to one to the Anode and two to the Drain of each of the MOSFET. The output winding is also complex and the video does not show it properly. So I think if you are beginner or don't have experience in making push-pull transformer, you will find it is near impossible to create this converter by just looking at the video and schematic because of this transformer winding issue that this video does not give enough detail. If you are beginner I suggest you just make a simple BUCK converter first, if you need a buck converter that can go up to 100V then you just need to separate two buck converters in series: a buck that convert 60-100V to say 35V, then step it down again to 12V.
High mate, I need a answer as soon as possible what changes i need to do to make it for 36v or 35v instead of 12V ?? do i need to change the number of windings and zener diodes ?
I tested it. Maximum efficiency is 90% at 48V input. 15V output - 20A. Efficiency will be lower at other voltage levels. Minimum of 78% at duty less than 10%. The mosfet is quite hot.
@@PhdHung Those IRF512 FETs have a huge RDSon ! I understand these are salvaged from the skip, but you could probably reduce the heat, improve efficiency and perhaps get rid of the heatsinks as well, with better suited FETs. If you still want 100V, you can fit IRF4110, otherwise at 70V you can put IRF3077 with 3.3mOhms max !
What might be practical? Also, I had a populo 8amp that I noticed had 4 prongs of which 4 were active. On the nakto camel the battery is 2 prong. Yet the recepticle accommodates 4.
Can i direct connect a recharger? And can I run while recharging? Or would this over amp? Sorry so many questions but people out here have no idea and it looked like you might.
Thanks for such a great informative video , i just want to know for cost cutting if we use only one mosfet and one fast witching diode will it work properly
@@PhdHung This paper is different. Not is a photographic common paper (glossy). Can you give me the link where you bought it from??? Giấy này là khác nhau. Không phải là một loại giấy chụp ảnh thông thường (bóng). Bạn cho mình xin link bạn mua ở đâu được không ???
hi,the values of resistance which you use is not same with circuit diagram.can you share the final circuit diagram.as r3 and r7can you redraw circuit again.
Homemade 102 i mean fix point at 12v then can step down to 2v and step up to 24 v it’s buck-boost converter and have current limiting , rang is 2-24v and input voltage is 12v, can you do it ?
I am confused about one connection, why have you connected battery voltage to starting of transformer secondary winding? Shouldn't it be at center point of secondary side??
Iie warmest congratulations for this very very interesting and safe project I will try to make it happen. I await the latest version with the control of the output current, who knows it could be made for 50A. Then I wanted to ask if this circuit is good for powering electronic circuits because I don't see any inductance or capacitor in output for filtering. Well come on I'm sure the next version will be TOP. Congratulations again and to the next video. 😉😉
@@PhdHung When making version 2, please make variable input from 10 or 12 volts to 72 volt variable input, your design is good but i working voltage source from 12 volt input, i am ok, if the output voltage is less than 12 volt DC if given variable voltage from 12 to 72 volts DC how much maximum input ampers it can handled ? How much maximum output ampers it can provide at 12 volt DC output ?
@@Royd20 Well, it's not possible. The circuit is a buck converter, ie it converts the voltage DOWN, not UP. What you ask for is a BOOST converter, which does the opposite.
Hi bro is this high efficiency buck? I plan to build one with pulse trafo for my solar. Since i dont know how to use uc3845. Can i increase the efficiency by adding 150uh inductor to the output?
When will you publish updated version, it is one of best video. One question please does variation in input voltage (like 40 instead of 55 as a fluctuation) will make variation on output or output will remain constant ?? Please answer
Most of the video is watching assembly. No current indication at the end though it looks like a 55w headlamp bulb which is only 5A, not sure if that qualifies as 'high current'? As you're stepping down the voltage I'm not sure why a transformer is being used, unless isolation is required otherwise a simpler buck converter would have been more appropriate, surely?
Hi im trying to build the smallest inverter with feedback on the world. But i need a very small transformer. Can you make a Video about rewinding a transformer from an phone charger? Thanks
@@PhdHung can it work in bike as regulator and rectifire (RR unit) I want continuously current without wave changing so that head light will work continuously without doing deam and hight .. My bike rr unit is giving wave changing ac current , i want pure dc current without wave changing...
This is a great job, but you did not show the number of turns for the second side winding, because the first side was 6+6, and the other side is which turns. Thanks
I am follow yours interesting videos about inverters. I am interest to know the a circuit diagram for my amplifier... 12vDC input from battery and output is 33-0-33 v DC WITH 20 AMP. INCLUDES OVER, under voltage protection and constant voltage and amps output. Plz give me any circuit diagram with transformer makibg. Or any assembled kit available from you... Cost please...
For low current module you may check at the link given here: miraimulti.com/product/dc-buck-converter-48v-to-12v-isolated-wide-range-box-module-mornsun/
Avdhesh Kumar 1 second ago For low current you may check at the link given here: miraimulti.com/product/dc-buck-converter-48v-to-12v-isolated-wide-range-box-module-mornsun/
Respected sir,,, Check the out put volt on load. Maximum check the ampere of out put 12 volt. Check the out put 12 volt with 10 ampere to 20 ampere current. How many voltage down with 20 ampere at 12 volt.
@@PhdHung can I get it from u bro or bro here my WhatsApp number(6009656784) I ve 48v solar panel and 24v battery so help me out for my solar controller
:D, I'm pretty lazy modifying eagle files. Please see the file list components
Hello sir PCB layout file is corrupted please help me
hi my friend ineed youre email:cosmasnjau@gmail.com
i need flook meter like you have
000000000000000
can you share circuit diagram
This video does not explain the principle, so I will try to explain one:
This is NOT a buck converter, there is no inductor here. This is using Push-Pull Half Bridge topology using IC SG3525 that is widely available. This IC responsibles for generating Inverting and Non-inverting alternating PWM output for those two MOSFETs on heatsink. The two MOSFETs responsible for delivering the "push & pull" current for in the transformer. The transformer is using turn ratio of 0.375.
Using transformer at "full duty cycle" the output voltage is input voltage times 0.375. For example, if the input is 72V then the output will be around ~26V (this is if both the MOSFETs have ~50% duty cycle). The output is then put on feedback into the inverting pin No. 2 of the IC. The duty cycle adjustment (shown in oscilloscope in this video) is only for one channel while the other channel is kept near 50% duty cycle. If the input is 72V with the "full operating" you get output of ~26V but if the duty cycle of one channel is reduced to around 23% instead of 50% of it then you get roughly 12V in output. The blue mini-trimpod that you see is for this duty cycle adjustment.
By the look of the MOSFET chosen IRF512, this can only handle at maximum 8A (4A for each MOSFET). Ideally this should only be used for 5A or less continuously and with additional fan.
Based on the transformer ratio 0.375 the minimum input voltage should be 1/0.375 x 12 = 32V. Input for lower than 32V will not be able to reach 12V output (it will output less).
Note that there is a difference in winding of the transformer. The push-pull topology is using transformer winding that is slightly different than the typical transformer. And unfortunately it is not shown in the video. Note that there are THREE terminals on push-pull in primary side of transformer and are connected to one to the Anode and two to the Drain of each of the MOSFET. The output winding is also complex and the video does not show it properly.
So I think if you are beginner or don't have experience in making push-pull transformer, you will find it is near impossible to create this converter by just looking at the video and schematic because of this transformer winding issue that this video does not give enough detail. If you are beginner I suggest you just make a simple BUCK converter first, if you need a buck converter that can go up to 100V then you just need to separate two buck converters in series: a buck that convert 60-100V to say 35V, then step it down again to 12V.
thanks for explaination
High mate, I need a answer as soon as possible what changes i need to do to make it for 36v or 35v instead of 12V ?? do i need to change the number of windings and zener diodes ?
It was a nice and useful video. I watched with pleasure. thank you.
Yes, I'm glad to hear that
Very good 👍👍
Dear brother, I have no words to appreciate you.
Thank you so much.
By any chance, have you created a graph of efficiency versus input voltage ?
I like very much what you do, anyway
I tested it. Maximum efficiency is 90% at 48V input. 15V output - 20A. Efficiency will be lower at other voltage levels. Minimum of 78% at duty less than 10%. The mosfet is quite hot.
@@PhdHung Those IRF512 FETs have a huge RDSon ! I understand these are salvaged from the skip, but you could probably reduce the heat, improve efficiency and perhaps get rid of the heatsinks as well, with better suited FETs. If you still want 100V, you can fit IRF4110, otherwise at 70V you can put IRF3077 with 3.3mOhms max !
Wat about Amps the will change as well how we can know the amp after current modifications?
Great work quality.
Question it I need more amperage on the output should I just use mosfet with higher amp rating or use thicker coil wire
both
Hi, what did you use as a 20A Fast Diode? Thank you.
Find fast diode in ATX power supply
You have shown 24v to 72v but u r testing in 55v? Is it work from 24v and in your diagram also mentioned 48v input. Please clear doubt.
Serious question: can a e-bike running 36v 10amp battery handle a 48v 10amp battery with no mods?
no bro, It will burn
@@PhdHung I thought amperage burned. How then might I extend the battery life?
What might be practical? Also, I had a populo 8amp that I noticed had 4 prongs of which 4 were active. On the nakto camel the battery is 2 prong. Yet the recepticle accommodates 4.
What mod would be needed? Motor is 250/350w.
Can i direct connect a recharger? And can I run while recharging? Or would this over amp? Sorry so many questions but people out here have no idea and it looked like you might.
Thanks, you circuit is one of the best...
Thanks for your reply sir,,,,a big fan of yours
Homemade 102 dear brother.... my request is pending......
Muốn điện áp đầu ra tăng lên 24v thì cần can thiệp tần số hay tăng số vòng dây của biến áp ạ?
tăng vòng dây lên nhé
Tăng bao nhiêu vòng ạ? Em ko biết công thức tính biến áp xung ạ
Thanks for such a great informative video , i just want to know for cost cutting if we use only one mosfet and one fast witching diode will it work properly
5:30 Please, where do I find this paper for thermal transfer ?????
This is paper for inkjet printers. However, you must use a laser printer to print PCB files
@@PhdHung This paper is different. Not is a photographic common paper (glossy).
Can you give me the link where you bought it from???
Giấy này là khác nhau. Không phải là một loại giấy chụp ảnh thông thường (bóng).
Bạn cho mình xin link bạn mua ở đâu được không ???
They have become meke very useful projects👍
Can we get constant output if our input is variable
Yes, ok
Please what is the size of the transformer use it here?
i use EE28
@@PhdHung thanks
hi,the values of resistance which you use is not same with circuit diagram.can you share the final circuit diagram.as r3 and r7can you redraw circuit again.
Project file in video description
@@PhdHungThe resistance values in the circuit diagram and the resistance values you use are not the same.
They bro add the soft starter to avoid the sparks at input
Your design is prety good but did you caculate the efficiency off the circuit ?
What is the air gap(AL) value of this ferrite core?
I will eagerly wait for your reply.
Good job , add current limiting mode “ CC “ and can step down voltage to 2v.
This circuit is not suitable for a wide voltage range. The effect will be very low when the duty is small.
Homemade 102 i mean fix point at 12v then can step down to 2v and step up to 24 v it’s buck-boost converter and have current limiting , rang is 2-24v and input voltage is 12v, can you do it ?
I am confused about one connection, why have you connected battery voltage to starting of transformer secondary winding? Shouldn't it be at center point of secondary side??
Can you send your contact details.
Iie warmest congratulations for this very very interesting and safe project I will try to make it happen. I await the latest version with the control of the output current, who knows it could be made for 50A. Then I wanted to ask if this circuit is good for powering electronic circuits because I don't see any inductance or capacitor in output for filtering. Well come on I'm sure the next version will be TOP. Congratulations again and to the next video. 😉😉
Very informative.can you give information of transformer bax you used datasheet of that or turns ratio.
Project file in video description
If you provide in diagram it is very useful for us
Sir In project file secondary side three pin you used
@@PhdHung sir in secondary side you used 3pin
Pls do a tutorial on how to coil transformer for inverter to any wattage
ok, wait me
@@PhdHung
When making version 2, please make variable input from 10 or 12 volts to 72 volt variable input, your design is good but i working voltage source from 12 volt input, i am ok, if the output voltage is less than 12 volt DC if given variable voltage from 12 to 72 volts DC
how much maximum input ampers it can handled ?
How much maximum output ampers it can provide at 12 volt DC output ?
@@Royd20 Well, it's not possible. The circuit is a buck converter, ie it converts the voltage DOWN, not UP. What you ask for is a BOOST converter, which does the opposite.
Great job !! Very useful project !! You are the best!!
Thanks
Hi bro is this high efficiency buck? I plan to build one with pulse trafo for my solar. Since i dont know how to use uc3845. Can i increase the efficiency by adding 150uh inductor to the output?
When will you publish updated version, it is one of best video. One question please does variation in input voltage (like 40 instead of 55 as a fluctuation) will make variation on output or output will remain constant ?? Please answer
It has voltage feedback. The output voltage will be stable
I can input 24v solar 5amp and out 12v 10amp ?
Yes
Will it work like mppt??
Bro, which one is more high efficiency (%) using TRAFO(EER28) or Toroid cores 33mm for large currents (step down)?. thanks
Toroid cores, for sure
Toroid cores yellow/white and green color. Which one more better Bro which same of turn wire.?
Good project , make a adjustable 0-36v recommended,
It is very difficult to reduce the voltage to 0V. Most are at least 1.5V.
Bro request, short killer range voltage 1.2-5volt dc high current 😁
Most of the video is watching assembly. No current indication at the end though it looks like a 55w headlamp bulb which is only 5A, not sure if that qualifies as 'high current'? As you're stepping down the voltage I'm not sure why a transformer is being used, unless isolation is required otherwise a simpler buck converter would have been more appropriate, surely?
Good tiçhing 👍👍👍👍👍👌👍👍👌👌👌👌👌
Can you give the link to get circuit diagram for this .
Thank brother.
Good works
output voltage stable to fix 12v if input voltage increase/dicreaase? or output voltage also increase/dicrease
Chỉnh dc dòng nữa là ngon luôn ad ơi !
Wow you are amazing I'm a big fun wonderful works keep it up. 🤖
Hi my friend... can you fix an invert-er from car alternator? from 12 v to 60v or 72v for self charging my EV car of 5 or 6 batteries.... Thank you.
I'm not sure
Sir which paper u use for toner transfer
I use glossy paper and laser printer
good one
Now We have need a good solar charger controller circuit.
All Market produce (MPPT controller) not charging properly.
how to make circuit which can take both AC / DC - 20 to 253V, & convert it to 24vdc 2 amp.
Hi im trying to build the smallest inverter with feedback on the world. But i need a very small transformer. Can you make a Video about rewinding a transformer from an phone charger?
Thanks
for 72v oor more, how many changes i have to do?
Hi. How to get 5A 10A .. smaller size. Space?
Please explain your request more clearly.
@@PhdHung 3-5A
sir nice video but please make the video on design of transformer in detail.thank you.
This can 24V 20A with trafo EER28?
is there an option to buy this transformer?
no bro.
is it convert extra voltage to current (amp) if input voltage more then output voltage?
Exactly
Can I use this in battery charger by solar panel
I think it is ok. But it has no current protection, please consider.
@@PhdHung can it work in bike as regulator and rectifire (RR unit)
I want continuously current without wave changing so that head light will work continuously without doing deam and hight ..
My bike rr unit is giving wave changing ac current , i want pure dc current without wave changing...
Hi, i have a 75v transformer, can i use it ?
This is a great job, but you did not show the number of turns for the second side winding, because the first side was 6+6, and the other side is which turns. Thanks
16+16
but he has connected starting of winding to battery point dont know why
Sar aap ki video bahut acchi hai lekin a complete Milega Kahan
Nice, Cant wait to try it out
:D
I am follow yours interesting videos about inverters.
I am interest to know the a circuit diagram for my amplifier... 12vDC input from battery and output is 33-0-33 v DC WITH 20 AMP.
INCLUDES OVER, under voltage protection and constant voltage and amps output.
Plz give me any circuit diagram with transformer makibg. Or any assembled kit available from you... Cost please...
Pls I need the circuit diagram for this project
How do I achieve 3-5A in this circuit ?
if input 100V then it work?
no bro.
Good job dude so cool and great guy
do you sell these?
Sorry . I don't sell
For low current module you may check at the link given here: miraimulti.com/product/dc-buck-converter-48v-to-12v-isolated-wide-range-box-module-mornsun/
Super best 🙌😍
Thanks
ola´gostaria de informar , quase todos os arquivos que estou baixando estão corrompidos o que sera
Hello sir it would be helpful if you say the inductance of the both coil please
Please tell me how was the efficiency of this design
Very good. Thanks Ad.
Sir u mention Litz wire diamention is mm2 so confusing pls specify this is a diameter or area.
It is a cross-section
@@PhdHung thnks
Please explain a 72v to 240v 50 hz 4000w squ wave inverter with stebilised supply
Is output volt fix to 12 if input voltage up or down?
Thanks
Yes, the output voltage is always stable at 12v
Nice project
simply the best
Nice work.
I can't see your project file.
Please re upload the file and verify that the file is accessible to everyone that needs it.
Thanks
The download link is still good. You need a computer to download the file. Can use mediafire link or google drive. open dile .rar with winrar on pc.
Ok
I will try to access it from the desktop computer.
Thanks alot
It is TL494 ?
No, it is SG3525
Giả sử dùng mấy con công suất như 100A/90V thì dùng tải có tăng lên đc ko
tăng là phải tăng tất cả mới đc. Mosfet, biến áp. Diode, totem pole driver
Howmuch for this? Is this available?
Avdhesh Kumar
1 second ago
For low current you may check at the link given here: miraimulti.com/product/dc-buck-converter-48v-to-12v-isolated-wide-range-box-module-mornsun/
Can be used as universal buck converter 0 to30v an so on thanx for nice project
I think it is similar.
Using same circuit modifying feedback. Is it possible
Can you make a mppt charger for 12 volt battery charging.
biến áp xung dây bao nhiêu chập bao nhiêu vòng vậy ad ơi , cả sơ và thứ cấp nhé
Quanto fica uma desse amigo já montada?
Congratulation. If out Will 24v How Will make ?
hi to all
any one kindly explain the transformer winding calculation details which is not shown in this video. it will be helpful for me.
Great job sir,
Is this circuit available for 60A input?
I'm waiting for V2 version
Thank you
Yes, I will design a new version.
Hai..
You can make switching smps 35vac ~ 85vac to 24vdc max 1a
Use regulator catv amplifier
ok, wait me
Hola descargue el archivo y cuando lo descromprimo está vació me pudieras ayudar
Respected sir,,,
Check the out put volt on load. Maximum check the ampere of out put 12 volt. Check the out put 12 volt with 10 ampere to 20 ampere current.
How many voltage down with 20 ampere at 12 volt.
Yes, I will make a video about it.
@@PhdHung,,
Next video make about it,, soon
Thanks
Can you tell us were the items to Buy
Tu ne montre pas le circuit pourquoi
Can you made again this module ?, i want to buy you product.how much its cost i pay
sr cant dawon lood datagram.help me
is a 12v to 14v converter possible?
here ruclips.net/video/VYFFTI3hXFw/видео.html
Sir, can it produce 40 volt 3 amphere to 12 volt 10 amphere??
Please reply...
Yes
Where is v2???
Bạn cho minh hỏi công thức tính số vòng biến ap xung nhu thế nào vậy
Trong list video đã có video tính toán biến áp xung, bạn coi lại nhé
Can u make 48v solar for 24v bsttery controller plz update if possible
ok bro
@@PhdHung can I get it from u bro or bro here my WhatsApp number(6009656784) I ve 48v solar panel and 24v battery so help me out for my solar controller
Pls give me dia gram
With component value
i connect 2 battery total voltage 24 can it convert 12 volt and can it run dc led 13 bulbs
Sir plz plz
LOVE YOU SIR
Hello sir PCB layout file is corrupted please help me
Grand chapeau
I'm waiting for news virsion of this converter upto 12 volt 80 amp thanks
I stopped this project.