Powerful BUCK 10A 24V 80V to 12V
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- Опубліковано 29 вер 2024
- A few days ago, I bought a buck circuit from China. It has an input voltage range from 24V to 80V. Output voltage 12V 10A. After disassemble it, it uses IC UC3845. Amazingly, it uses N-mosfet. Usually the buck circuit will use P-Mosfet. I then redraw this circuit to find out why it might work with N-Mosfet. Another interesting thing, it uses diode and boostrap capacitors. So it can drive highside. In the next video, I will design a large power PCB Buck, with CC and CV. Wait for me.
If you like my video, please like, share and don't forget to subscribe to my channel, thank you everyone.
All my projects are open source. You need web browser to download file (I upload it to google drive), open the file with winrar on PC. I use EAGLE 6.6 to design the PCB.
Facebook group : bit.ly/Creative...
Diagram here : File 38 in bit.ly/AllLink You need web browser to download file (I upload it to google drive), open the file with winrar on PC. I use EAGLE 6.6 to design the PCB.
#Inverter
#12Vto220V
#Buck - Наука та технологія
circuit is not correct
Thank you very much for this useful tutorial, keep it up brother.
Thank you so much
Se ve bueno, a practicar!! Felicidades
Muito bom só falta o projeto em mppt, eu fico no aguardo...
coming soon.
Sir, i want to know is it used in e ricksaw vechile?
It is used to convert the battery's 24V to 80V voltage into 12V. This 12V voltage is used for the headlights. FAN as well as whistle.
Thank u👍
min 06:12 a fly...!!! Una mosca...!!! 🤣😂🤣😁
Hi my friend,
I built the circuit. I fed the circuit with 24 and 36 volts, but I get a steady 2.8 volts. I can't get 12 volts. why could it be ?
Same issue and the same output Voltage
same issue did you find out the problem ?
Bootstrap drawn wrong. 5.1k to MOSFET drawn going to + Out. Should be connected to cathode side of 1n4148 to provide MOSFET with enough voltage to turn on.
hi my friend,
I built the circuit. I fed the circuit with 24 and 36 volts, but I get a steady 2.8 volts. I can't get 12 volts. why could it be ?
Hi All this circuts on paper is wrong ,this man only increse there watch time
how is pin 5 on the uc3845 in connected to the positive output?!
Bác mua bộ nguồn lày ở đâu vậy mách hộ e với
ra quán sửa xe đạp điện bạn nhé
Cảm ơn
How is pin 5 Ground on the UC3845 in connected to the positive output?!
Output voltage is invented. The fly back voltage from the inductor will be negative.
Ur captured schematic wrong c #5 of 3845,43,42 is negative voltage , you connect in positive!
Because it uses mosfet N. So it needs highside driver for mosfet N. Could not connect it to GND.
Can I use uc3843 ic
Ok, u can
Bare in mind if the transistor shorts out full input voltage will be present on the output.It's better to use flyback topology because it's inherently safer if the fault occurs.
Ground of 3845 circuit should be connected before the coil. I.e with junction of Drain/cathode of diode...
Sir one more question to ask that on following your video you are applying 31volts instead of 24v. Is that it will work from 24v? & in the converter box it is printed 36v to 70v.
Something is wrong with the scope waveforms. Some pulses are very small and some are big. you need to check if it is running smoothly or cutting out and oscillation. Try to trigger at the high point of the big pulses and then make the time base 1 mS and look at it. Does it look steady?
Because it's simple, there's a lot of noise. But it still works fine.
Fatal eror sematic.
There's another serious mistake. Faulty connection to circuit + vcc and gnd (1n4148 )diodes. This circuit won't work. After the trigger voltage, the circuit must operate with the voltage generated in the coil to ensure stable operation with high voltage. + Connect to the input and output of the Vcc and gnd coil terminals. I want you to redraw the circuit diagram by correcting the shunt resistor and the integrated supply terminals. Otherwise, a lot of people waste time.
bad english sorry.
I bait you he's just doing it to get UA-cam income.
Pin number 5 should be a Ground?... i tried the same circuit but the 12v output is not coming...
It won't work with an n-channel mosfet. You need a bootstrapped high side driver for it, or a gate drive transformer.
it works fine, this circuit has a boostrap capacitor and a diode
And you didn't show it in the schematic 😢@@PhdHung
Sir, pin 5 of 3845 is not grounded as per your schematic . Kindly clear the doubt.
possible, but the PIN BCE location is different
Great, Can you make a video about MPPT , i mean a real MPPT which really track the maximum power point
yes, i am designing mppt using arduino. It will appear soon
Well that's sounds pointless
Maximum power point 😂😂😂
When sun shines on all the panels just take a picture of solar output 😂 just dam lazy 😂
@@PhdHung hhgghhhh
@@PhdHung mppt charge controller 12 volt 60 amps
Sir, two mosfet used in dc to dc conveter , in your circuit diagram one mosfet is used?
it is buck circuit
Phsically there are 2 FETs on the PCB, But the Circuit Diagram shows only One FET.
It means circuit diagram is not that of the pcb shown. WHY?
O. K. The 2nd one is Schottky Diode and not am FET....... Sorry for a wrong query.
the circuit diagram error problems ground ?
Sir pin 5 of uc3845 is not grounded please kindly suggest corrected diagram.
I hope we can replace uc3845 as uc3843
Can use uc3842 ? please reply sir
Kindly guide me. On input 30v applied the output is giving 11.7v, instantly if 12v 21w lamp is connected the load drops to 6v. Next if input is changed to 36v the ouput also changes to 18v. Please tell me ouput voltage is not fixed at 12v, is it variable?
I don't understand how can the ic ground pin be connected to the output, make a the cc cv video please.
Yes, wait for me
Sir coil is getting heat? Why? I have connected 12v 21w 2 bulbs.
Nice bro. But i want 12vdc 30amp . Is it work for 30 amp?
You need to connect mosfet and diode in parallel. Use larger inductors.
@@PhdHung ok bro thanks.❤️❤️
I think inductance is low.result switches be harm and Droid go to saturation
bu devre şemasını nerde bulabilirim kardeşim. bana 120v-12v dc dc converter şeması gerekiyor. bunu örnek alıp değiştirebilirim.
Floating the ground of the pwm controller is a a tricky idea, however should work, but may end up in an unstable-oscillating operation. I would be a bit more cautious using this schematic over 50V of input with the irf3205. The shown schematic contains a bug and will not run more than a couple of miliseconds!!!
dear friend, could you please indicate what is the error?
I copied the schematic, but the mosfet heats up quickly on a 1 amp load
ERROR DIAGRAMS
There is error drawing in the diagram. You did not specify the shunt line the diagram.
it uses PCB line as shunt resistor.
Yeah. I meant that. you better specify it in the diagram. If there is no shunt in the diagram, there will be no current protection.
Circuit schema error correction.
I would like. Circuit on you can check you. open the schema link below.
ibb.co/Lrj37FJ
@@suleymandogan8205 Will this scheme really work 100%? I want to build it!
jaan bhanoojo no . not directly connected to GND. Potential difference is taken to operate at high voltage.
Bạn cho mình xin code của máy đo cuộn cảm với, trc mua của bạn máy test linh kiện nhưng mà mình thấy đo cuộn cảm nó cứ nhảy số linh tinh sao ý, mạch dùng atmega328 có nạp đc code này k ạ tks
at8 ko xài đc, mạch này dùng pic, có video trên kênh rồi, tìm lại nhé b
circuit is wrong more me and 3 built it and found 2.8v only out over 36v the mosfet will burn
inverse boostrap?
buck use bostrap
Sir jest personal input Ac 10 to 50v output Dc 12v this is possible?
Very good project 👍
thanks bro
kardeşim bu devreyi kurdun mu sen ?
Hi every body, who have the description of this circuit, I have the final exam with this circuit, please answer me pleas
This is a stronger copy version. ua-cam.com/video/aZ4dUIG3mIE/v-deo.html
Baro nice bute you have pcb. File in pdf. I want to make this
Irf3205 is 55v volt ,so how is working 80v
Sir, thank you so much for shearing your knowledge .
I am from Sri Lanka .
Sir, inductance value 50 micro henry with respect to 26 turns. What wil be the ampere for the same?
there is a circuit for the converter and the printed circuit board in lay6?
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.
Do you need a boost circuit from 12V to 60V ?. can use ua-cam.com/video/VYFFTI3hXFw/v-deo.html
I/m sorry to tell that I could not get access to Facebook, it's prohibited by our ISP! That applies to all Facebook accounts! as some of your work is very interesting and to be able to follow and try on my own, I need access to the relevant data as Circuits, etc., etc. and it would be very appreciated to get access to another way/location to it, if possible. Thanks for any help and thanks also for your excellent work.
I use facebook because it's easy to share with everyone, however, if you want any project, I can email you.
how to make a dc regulator with input 30v-50v 100a and output 24v 100a. I beg for your help.🙏🙏🙏🙏
It is very difficult
how to make fuel pattern out of this diagram please help i want to make this project
ok, wait me
Can i use direct so)ar pannal 24v plat
If you use any DIY meter in your video like the inductance meter used in this video please share a link to the circuit for someone that needs to build it.Thanks.
ua-cam.com/video/t4SyZxUxDOs/v-deo.html
Please Sir,if the input voltage is high but the current is small, could higher current be achieved after stepping down the voltage?
of course.
the above diagram is incorrect ,
Sir, i have purchased same converter, but it is not working from 24v rather it is working from 48vdc. Kindly help. Also i have connected 2no 12v 7Ah battery.
It has an active resistor, reducing its value, it will work with 24V. If you need help. Contact me at FB group.
Kindly mention active resistor in your diagrm.
Hình như thiếu con shunt, nó nối với con trở 1k, con đấy là cái đường dây đồng chạy lòng vòng dưới cuộn cảm.
nó đó
@@PhdHung à, b xem lại cái đường âm của tụ bostrap nó nối đằng trước cuộn cảm chứ không phải sau.
inductor coil diameter ??
Sir, is that output is variable or fixed ? Also in the pcb there is 2 mosfets but the digram is showing 1 mosfet. Further can i use 3844 in place of 3845?
1 of them is a diode.
Oh i got it schottky diode.
Sir. Can you please suggest is this converter will work from 24vdc? The rating display in your video 36v to 80v.
it can work well at 80V if you use mosfet IRF3710
Please suggest it will switch at 24v?
Vous pouvez placer le schéma dans la description
i need this type of circuit which convert 24v to 12v step down but without troidel coil... can u help me
use 7812
no dear for the high amps upto 50 to 70
Sir, pin 5 of uc3845 is not gounded in the schematic diagram. Please kindly reply.
This circuit uses mosfet N, so we need boostrap circuit. Pin5 will not be connected to GND
Thanks👌
More info on the tester
GOOD MORNING MY FREND, I NEED ONE INVERTER 5000 WATTS, HELP ME
Yes, wait for me, I'll help you.
Sir, pin5 of uc3845 is not grounded in the diagram shown. Please suggest.
This circuit uses mosfet N, so we need boostrap circuit. Pin5 will not be connected to GND
Thank you so much you are really great my brother.😁👍
Thanks, I was looking for a higher voltage buck converter
80 volts is high enough.
Trở mồi 27k nhe, 2,7k khi cấp 50v là chết ic mất
Please, microcontroller mppt solar charger with display
Wait for me, I am designing mppt using arduino.
Great video Sir,
I want 12 Volts, 30 Amps at the output what changes should I make
using mosfet IRFP4668 and larger diode. Larger inductors
@@PhdHung and how to calculate their values sir?
Can I replace UC3845 with UC3843?
I'm not sure, please see the data sheet
continue sir to show this type of usefull videos.....best wishes
Thanks
Sir, pin 5 of ic3845 is not grounded instead it is connected to postive output. Please clarify & suggest for any change in diagam.
This circuit uses mosfet N, so we need boostrap circuit. Pin5 will not be connected to GND
Thanks for ur response
Thanks for your reply❤
Please kindly reply inductance 50uh /26turns ampere rating.
use 1.2mm copper wire. It can work well with 15A.
Good reply thank u so much❤
Hi.i send to you in Facebook messenger, some pictures for made a power full project by egs spwm.with respect.
Join the FB group, you will see me
@@PhdHungyour facebook id?
now ADD voltage divider for feed back line and tataaa output voltage regulator working like a charm :))
OK
I have a 82 v to 12 v dc to dc converter, I had connected it with opposite terminal , afterwards I noticed it.. But now it's showing only 50v ( where it has to show 62v) what will be the problem
matul lurr,,, boleh jd ref.. thanks
?.
How can i double the output voltage to drive a series of 15 lights?
Please reduce the feedback resistance.
@@PhdHung Non of the links in description is leading to the google project store.
Also, please advise how i might be able to reach out to you by mail...or any other channel of choice.
Thanks.
Please kindly help i recently purchased similar dc to dc converter & connected 3 nos 12v battery 36v & found output is oscillating. Therefore i connected 4 battery in series to make 48v instantly it is giving 12v output. Please help to suggest how to make it work from 24v ?
NICE BRO . waitng for cc and cv video.....
Yes, I think it will appear soon
Sir, uc2845 & uc3845 are same?
I am not sure. You can find its datasheet on google and compare.
Please kindly advice it will work from 24vdc?
may work at lower voltages, but you need to reduce the resistor value
Thanks for ur response.....😁👌
Có mạch in thì tốt quá
Please kindly mention 50uh is how many ampere?
10A to 15A.
Thanks👍
Hi, thanks for the circuit. Kindly post the PCB for this project
ok, wait me
Good reverse engineering.
Cheers from Indonesia
Can u provide me inductance coil?
No, I do not sell it
Another great scheme and project. Btw, what is the title of song in 7:44
I don't remember its name, I took it in the library of camtasia software 9.0
Sir i have tested with bulb it is working from 24vdc. But if i connect amplifier drawing current 5A it is not working. Why?
sir how can i change the output by change which thing?
Change the resistance connected to pin 1 of UC3845
@@PhdHung ok thanks sir 👍
Please kindly inform it is used in e ricksaw or bike?
in electric bicycles
Thanks👌
Hello sir
Please explain the uc3845 pin 5 grounded in you symmetric..
I Do not understand
Dear bro, it produce 14v output. 30v input. I used 10w led only. When i connect led load output voltage reduce to 6v. As well output not good brightness too. Do u know what is wrong
14 volt Mein kse hoga??
Ừm ok
Can i ise this for wind turbine?
I think it will work
Sir, please tell me the core measurements
Sir kindly help this type of converters are all working from 36v and not 24v what is the reason?
Good tiçhing 👍👍👍👌👍👍👍👍👌👌
Bkit malabo un diagram
Good work. You should put all the circuit diagrams at the end of the videos.
Yes, I will