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.
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.
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!!!
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?
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.
6 PEOPLE DID NOT LIKE THIS VIDEO. WHY NOT? I am a p/s designer and I think it is a good video. He is sharing stuff that he learns from buying and checking Chinese p/s.
Thank you, everyone has a different perspective on one thing, for example, you can see this girl is beautiful but not for others, this video too, I cannot please everyone. But I will still try. Thanks again, God bless you.
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?
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?
We need a DC DC converter with input (36 to 60v) and Output 24 V 5A to charge 24v battery bank. Initially a piece required for test. If our management accepted your products, then requirement will be 500 to 1000 pcs
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.
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
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.
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 ?
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.
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
Is the output voltage of this circuit not determined? Why did the voltage drop from 13 to 12 after loading? And please tell me how to conostant its output at 14 volts, thank you.
@@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.
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.
is it iron powder ring core? Can i make buck converter with iron powder core? i have 3 piece iron powder core which was connected in computer power supply.
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.
Sir, thank you so much for shearing your knowledge .
I am from Sri Lanka .
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.
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
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.
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.
Good job, that’s i’m talking about ... made with CC & CV mode high output current and not just buck converter made with buck-boost converter.
Ground of 3845 circuit should be connected before the coil. I.e with junction of Drain/cathode of diode...
6 PEOPLE DID NOT LIKE THIS VIDEO. WHY NOT? I am a p/s designer and I think it is a good video. He is sharing stuff that he learns from buying and checking Chinese p/s.
Thank you, everyone has a different perspective on one thing, for example, you can see this girl is beautiful but not for others, this video too, I cannot please everyone. But I will still try. Thanks again, God bless you.
how is pin 5 on the uc3845 in connected to the positive output?!
continue sir to show this type of usefull videos.....best wishes
Thanks
Thank you very much for this useful tutorial, keep it up brother.
Thank you so much
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
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?
Sir coil is getting heat? Why? I have connected 12v 21w 2 bulbs.
Thanks for sharing the schematics bro.
:D
Very good project 👍
thanks bro
kardeşim bu devreyi kurdun mu sen ?
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.
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.
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
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 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?
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
Once again thanks for your awesome projects! Please which resistor value should be change to enable 10V input? What should be the value?
Sir pin 5 of uc3845 is not grounded please kindly suggest corrected diagram.
thank you so much !
NICE BRO . waitng for cc and cv video.....
Yes, I think it will appear soon
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.❤️❤️
Se ve bueno, a practicar!! Felicidades
Good reverse engineering.
Cheers from Indonesia
Pin number 5 should be a Ground?... i tried the same circuit but the 12v output is not coming...
Good work. You should put all the circuit diagrams at the end of the videos.
Yes, I will
now ADD voltage divider for feed back line and tataaa output voltage regulator working like a charm :))
OK
Hola.en la placa de pcb hay una bobina impresa.donde iría conectada? Solo veo el tiroide.buen video .saludos.
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.
We need a DC DC converter with input (36 to 60v) and Output 24 V 5A to charge 24v battery bank.
Initially a piece required for test. If our management accepted your products, then requirement will be 500 to 1000 pcs
ok bro
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?
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.😁👍
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❤
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.
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 th-cam.com/video/VYFFTI3hXFw/w-d-xo.html
Sir, inductance value 50 micro henry with respect to 26 turns. What wil be the ampere for the same?
Thanks brother
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👌
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.
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.
Two parallel straight line symbol you used is for ceramic capacitor or electrolytic?
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
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.
th-cam.com/video/t4SyZxUxDOs/w-d-xo.html
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 ?
Good work thanks for sharing
thanks bro
Please kindly inform it is used in e ricksaw or bike?
in electric bicycles
Thanks👌
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.
Good tiçhing 👍👍👍👌👍👍👍👍👌👌
Irf3205 is 55v volt ,so how is working 80v
Can I use uc3843 ic
Ok, u can
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 i have tested with bulb it is working from 24vdc. But if i connect amplifier drawing current 5A it is not working. Why?
Baro nice bute you have pcb. File in pdf. I want to make this
I hope we can replace uc3845 as uc3843
bu devre şemasını nerde bulabilirim kardeşim. bana 120v-12v dc dc converter şeması gerekiyor. bunu örnek alıp değiştirebilirim.
Brother really good work
Hello sir
Please explain the uc3845 pin 5 grounded in you symmetric..
I Do not understand
good brother
there is a circuit for the converter and the printed circuit board in lay6?
circuit is not correct
the circuit diagram error problems ground ?
Sir jest personal input Ac 10 to 50v output Dc 12v this is possible?
Nice Work Brod. 👏👏
How efficient is it compared to an mppt controller of the same working power? ty
Can use uc3842 ? please reply sir
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
Bác mua bộ nguồn lày ở đâu vậy mách hộ e với
ra quán sửa xe đạp điện bạn nhé
Cảm ơn
More info on the tester
Is the output voltage of this circuit not determined? Why did the voltage drop from 13 to 12 after loading? And please tell me how to conostant its output at 14 volts, thank you.
I copied the schematic, but the mosfet heats up quickly on a 1 amp load
matul lurr,,, boleh jd ref.. thanks
?.
Sir kindly help this type of converters are all working from 36v and not 24v what is the reason?
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.....😁👌
how to make fuel pattern out of this diagram please help i want to make this project
ok, wait me
Please kindly mention 50uh is how many ampere?
10A to 15A.
Thanks👍
Sir, it is not working with 24v battery ? What i will do?
your print circuit diagram is worg connection with mosfet????
12v Module Se 6v input le sakte hai kya...?
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.
Hi, thanks for the circuit. Kindly post the PCB for this project
ok, wait me
Amigo cómo estás, si yo mismo armo el inductor que calibre de alambre uso? Saludos de Bogotá Colombia
Sir, uc2845 & uc3845 are same?
I am not sure. You can find its datasheet on google and compare.
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 TH-cam income.
Sir, uc2845 & uc 3845 is same?
Drain source voltage is it 100 volt
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
Hi is possible to put in 90V 1KW solar panel?
thanks
Can I replace UC3845 with UC3843?
I'm not sure, please see the data sheet
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👍
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❤
is it iron powder ring core? Can i make buck converter with iron powder core? i have 3 piece iron powder core which was connected in computer power supply.
Yes it is. U can use it.
Sir input 36v - 72v se output 10v- 3amp ka diagram bna skte he ky plz argent chyie
Please suggest it will switch at 24vdc?
yes.
Thanks😄👌❤
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
Super bro
keep it up
yes, thanks bro
Please kindly help to mention active resistor in your diagram.