I really like all of your design's for your switching power supplies but, I wish you could explain the construction of the transformer better. Wire diameter, number of turns and so on. It would really help me a lot because that is what is holding me back from building them. Thank You
Problems: 1 - Wrong output rectifier 2 - Can work only with 110V 3 - No EMI filter 4 - No Y capacitor between primary and secondary. 5 - No output inductor, so high noise. 6 - No ferrite beads.
I think what was really intended at the output is that there were two secondary windings connected together at one end, each with its own rectifier diode. That can work if the phasing is correct. You certainly can't use a centre-tapped winding. You don't necessarily need an additional LC filter after the main filter capacitor, but it is helpful in controlling noise. Certainly to meet conducted EMI requirements you'd need an input filter and the primary to secondary Y1 cap. Ferrite beads aren't commonly used in such a circuit but can be helpful sometimes. They can make things worse, sometimes.
@@tanishqbhaiji103 There is feedback derived from the auxiliary winding. Such an arrangement usually results in rather mediocre performance but it can be acceptable for some applications.
I didnt understand the aux winding circuit. Main supply via resistor and auz winding both providing power to vcc. So wouldnt they interfare with each other?. How this system working
It works by detecting the voltage across the source resistor of the MOSFET. This voltage increases as the load in the secondary side of the power supply increases (Ohm's law). When this voltage passes over the threshold voltage of this I.C (I think 1 Volt) the overcurrent protection within the I.C blocks the output pulses driving the MOSFET and the process stops.
Hello, what is the difference between ferrites with Gap and those without Gap? and those with Gap can replace those without Gap? for example these sources with UC3842 can be made with a ferrite core with Gap?.
This is a flyback converter. If you use a ferrite core for this amount of power the core absolutely MUST be gapped. This is because the thing that looks like a transformer isn't actually used as a transformer at all. It is an inductor in which energy from the input side is stored during part of the switching cycle with one winding and delivered to the output during another part of the cycle through a different winding. Gapping a ferrite core greatly increases its ability to store energy.
i use this circuit but snubber resistor burn and detroy.i replace bigger near 100k but snubber curcuit not action well because the resistor is very big.
Excuse me, sir, please give me a solution, how to make a circuit or driver module to replace the CKP and CMP sensors of the inductive type and hall effect type on the car, make a car ECU test simulator.
Very good and very well explained project. But whenever I've tried to simulate a circuit a this IC, it never works; it doesn't matter if I use multisim, proteus, psim, ltspice or anyelse, it's vever worked at least for me. Can you help me, please? Thanks in advance.
Hi Please upload how to make a ferrite core winding practically for 10amp charger and inverter transformer There is no video you uploaded regarding ferrite core That is big problem for technicians
Per his video and per his comment section - it is a Flyback SMPS. Who said this was a Push-Pull Output? He clearly shows that BOTH Diodes are conducting the same time, not alternating. What if the DOT Notation is ... DOT at the top of Secondary #1 and DOT at the bottom of Secondary #2 then the output coils operate in parallel, NOT Push-Pull ?
I don't understand yet why a center tapped output secondary, if FB only releases energy on half a cycle max, Even in the case they are paralleled there is no need for one of those two diodes ,...Am I missing anything?
ElectroBUFF, sounds easy to you but I saw you already used that PIN 3, how would you modify it so we can use output voltage for feedback. Good explanation as always.
@@raymondmichael4987 There is already a feedback in the circuit. It consists of R3 and R4. It detects the level of the auxiliary winding, which in turn reflects the secondaty voltage level detection and keeps it stable. Without this voltage divider this circuit would explode at once!
Feedback consists of R3 and R4. Without those resistors, secondary voltage will be over 23V. A feedback pin voltage is divided from auxiliary winding. Feedback is not using secondary winding. If you want more precise output voltage, please use TL431 and optocoupler for feedback.
All projects can be made but there is basic problem that how make pcb you want.please guide how we can order verios pcb design or make ourself is best option.thanks
This is a classic flyback topology. As such, the secondary of the transformer circuit is wrong. It belongs to the push - pull topology. Flyback needs only a single diode, while there is no need for center tap of the secondary. There is no polarity reversal of the output voltage in the secondary.
@@ΠάριςΑζής Who said this was a Push-Pull Output? He clearly shows that BOTH Diodes are conducting the same time, not alternating. What if the DOT Notation is ... DOT at the top of Secondary #1 and DOT at the bottom of Secondary #2 then the output coils operate in parallel, NOT Push-Pull ?
vto rsi Starting backwards in reference to your answer, your reference about the non existing dots cannot justify your (otherwise right) claim about paralleled secondaries. Moreover, paralleling is not drawn this way in schematics. Therefore, by the first sight, this secondary stage is usually found in push-pull (bi-phase) outputs. Apart from that any topology is characterized by its primary side and the secondary side fits the primary. Finally I have never seen a fly back topology with such a secondary. Your “what if” scenario doesn’t save the case. It’s only a hypothetic scenario.
@@ΠάριςΑζής Since there are NO DOTS - you cannot know the polarity of the output windings. In his video he DOES show both Diodes conducting *simultaneously* ( my way ) , not alternating ( not your way ) which does support the DOT NOTATION is my way, and NOT your way. You are assuming incorrectly - based on nothing ...
You can change the duty cycle, controling the voltage on VFA (pin2) in certain range. But you want to high range, it is depend of you chopper transformer too.
Sir plz help me iam in trouble i need to testing uc3842 but sometime 5V generate on pin 8 or sometime 0V and I need to produce 20khz frequency signal at O/P pin but according formula 1.8/Rt*Ct no accurate frequency generate. I apply 16V vcc and 0.001uf cap or 10k registor for Rt/Ct pin and get 165khz frequency at output I wait ur reply or any other one who can understand my problem
Yes, there is !!! The regulation is implemented using ... a) An Inner Current Loop and b) An Outer Voltage Loop ... You need to research Current-Mode PWM IC's ...
@@katarzynan.8500you are wrong. I have tested this circuit it destroyed because of startup resistors value 56k 2w in case of 110v , for 220v it's value is 220k because 3843 require 1ma current. Don't mislead people's. You have not tested this circuit practically. It's my challenge to you if you can run this circuit on 220v without changing resistor values. If you try with 220v it will burned.
@@ftspakelectronics8135 What if i want power supply to run with universal mains voltage. Can i use 100K for startup resistor to run in universal mains?
There is feedback but it is done by using the auxiliary winding, working on the assumption that the voltage from that winding tracks the main output winding. The accuracy of voltage regulation won't be very good but it can be acceptable for some applications. Some modern ICs, typically fully integrated with the control circuit and power switch in the same IC, are designed to use that sort of arrangement for feedback, but the design is such that some of the shortcomings are minimized.
With 320 VAC input and the turns ratio of the inductor you'd get about 600 volts across the FET when it turned off, ignoring the leakage inductance spike. You might not need a 990 V part but you'd want something rated at over 600 volts.
R3 should be 1.5k. R4 should be 12k. D1, D2, and D3 should be a UF4007. or Auxiliary winding should have 4.1 of a turn. D1, D2, and D3 should be a UF4007.
I really like all of your design's for your switching power supplies but, I wish you could explain the construction of the transformer better. Wire diameter, number of turns and so on. It would really help me a lot because that is what is holding me back from building them. Thank You
Problems:
1 - Wrong output rectifier
2 - Can work only with 110V
3 - No EMI filter
4 - No Y capacitor between primary and secondary.
5 - No output inductor, so high noise.
6 - No ferrite beads.
Helow sir... You have any diagram with following safety?? So plz share
You missed no feedback so it will never work
I think what was really intended at the output is that there were two secondary windings connected together at one end, each with its own rectifier diode. That can work if the phasing is correct. You certainly can't use a centre-tapped winding.
You don't necessarily need an additional LC filter after the main filter capacitor, but it is helpful in controlling noise.
Certainly to meet conducted EMI requirements you'd need an input filter and the primary to secondary Y1 cap.
Ferrite beads aren't commonly used in such a circuit but can be helpful sometimes. They can make things worse, sometimes.
@@tanishqbhaiji103
There is feedback derived from the auxiliary winding. Such an arrangement usually results in rather mediocre performance but it can be acceptable for some applications.
@@tanishqbhaiji103 If he would speak English, you would understand that AUX winding is used as @tan... said
Ottimo video, grazie e continua così.
tanti auguri e tanta felicità per te.
The windings of the transformer should all be clockwise or anticlockwise or the aux or secondary should be opposite to the primary. Plz guide
parabens pelo seus trabalhos , são otimos. abraços.
Wonderful explanation. I am also an engineering youtuber and doing work like you. Great to see this video.
I didnt understand the aux winding circuit. Main supply via resistor and auz winding both providing power to vcc. So wouldnt they interfare with each other?. How this system working
How to increase the current to 20A? Thank you very much!
Helpful project. I like it
I want to use this diagram for 18 volt 8 amp. Is that possible?
SIR KINDLY PLEASE BTA SAKTAY HAI K UC2842 KI JGA UC3842 LAG SAKTY HAI
Thanks for nice video....my query is....
for 192vdc output what changes to be made??
What will be the frequency if RT is 2.7 k and CT is 15 nF?
And what about output voltage regulation y feedback? There is no FB to the UC side...
Hello teacher good class
Mr.. can do you tell me..
How to work the current sense (I sense pin 3) what is the current sense working.. frequensi low or duty cycle low..
Thanks..
It works by detecting the voltage across the source resistor of the MOSFET. This voltage increases as the load in the secondary side of the power supply increases (Ohm's law). When this voltage passes over the threshold voltage of this I.C (I think 1 Volt) the overcurrent protection within the I.C blocks the output pulses driving the MOSFET and the process stops.
Can I get complete project??
Can I get pcb layout/ design
I need to make 192vdc BATTERY Charger...than what will be changes in this???
If you please what programm you are working thank you dear
can we use this for dual voltage (30v 0v 30v)?
This project is very good!
Can i use 13007 transistor instead of MOSFETs?
Hello, what is the difference between ferrites with Gap and those without Gap?
and those with Gap can replace those without Gap?
for example these sources with UC3842 can be made with a ferrite core with Gap?.
This is a flyback converter. If you use a ferrite core for this amount of power the core absolutely MUST be gapped. This is because the thing that looks like a transformer isn't actually used as a transformer at all. It is an inductor in which energy from the input side is stored during part of the switching cycle with one winding and delivered to the output during another part of the cycle through a different winding. Gapping a ferrite core greatly increases its ability to store energy.
i use this circuit but snubber resistor burn and detroy.i replace bigger near 100k but snubber curcuit not action well because the resistor is very big.
Excuse me, sir, please give me a solution, how to make a circuit or driver module to replace the CKP and CMP sensors of the inductive type and hall effect type on the car, make a car ECU test simulator.
Very good and very well explained project. But whenever I've tried to simulate a circuit a this IC, it never works; it doesn't matter if I use multisim, proteus, psim, ltspice or anyelse, it's vever worked at least for me. Can you help me, please? Thanks in advance.
Hi
Please upload how to make a ferrite core winding practically for 10amp charger and inverter transformer
There is no video you uploaded regarding ferrite core
That is big problem for technicians
Good video a you are a master teaching. pcb for this circuit?
Good afternoon sir how to make out put volt 25-0-25 10 amper
What is the voltage on pin 6. How can I get 60volts at the output.
What is the voltage on pin 6. How can I get 60v at the output.
Dear friends an DSO must be with you for these projects because set frequency hz is very assential for these projects
If this is flyback circuit? why to have push pull diode in output & what is input Lp?
Per his video and per his comment section - it is a Flyback SMPS. Who said this was a Push-Pull Output? He clearly shows that BOTH Diodes are conducting the same time, not alternating. What if the DOT Notation is ... DOT at the top of Secondary #1 and DOT at the bottom of Secondary #2 then the output coils operate in parallel, NOT Push-Pull ?
I don't understand yet why a center tapped output secondary, if FB only releases energy on half a cycle max, Even in the case they are paralleled there is no need for one of those two diodes ,...Am I missing anything?
Thank you for the design!
How about voltage feedback?
Greetings from Tanzania 🇹🇿
Easy to solve by using the current sense pin in a clever way cause it relies on voltage feedback
ElectroBUFF, sounds easy to you but I saw you already used that PIN 3, how would you modify it so we can use output voltage for feedback.
Good explanation as always.
Its easy to use a diode to isolate the voltage feedback from the output voltage
@@raymondmichael4987 There is already a feedback in the circuit. It consists of R3 and R4. It detects the level of the auxiliary winding, which in turn reflects the secondaty voltage level detection and keeps it stable. Without this voltage divider this circuit would explode at once!
Feedback consists of R3 and R4. Without those resistors, secondary voltage will be over 23V.
A feedback pin voltage is divided from auxiliary winding. Feedback is not using secondary winding.
If you want more precise output voltage, please use TL431 and optocoupler for feedback.
How can increase village to 30v? Is there a resistor I can work with or do I have to rewind the transformer?
You need to rewind transformer. Secondary should have 10+10 turns.
Which voltage rating capacitors have?
12V 50A is it possible? What do we need to change?
i dont test.but flyback use to 500 watt . higher than use pushpull or hbridge
Hi. Sir where is power factor correction? Thanks
What is the core size and inductance of transformer ??
All projects can be made but there is basic problem that how make pcb you want.please guide how we can order verios pcb design or make ourself is best option.thanks
Hi! What resistance can I vary to go up to 15 volts?
R3 & R4 make the voltage divider for the output voltage. But, you must not exceed Max Voltage at Vcc Pin 7 !
Copper wire thick (swg)?
This is a classic flyback topology. As such, the secondary of the transformer circuit is wrong. It belongs to the push - pull topology. Flyback needs only a single diode, while there is no need for center tap of the secondary. There is no polarity reversal of the output voltage in the secondary.
I browsed datasheets of the UC3843, and i seen, that negative and positive 12V are rectified.
Katarzyna Niemiec This is a matter of the topology used. Not of the chip used...
@@ΠάριςΑζής Who said this was a Push-Pull Output? He clearly shows that BOTH Diodes are conducting the same time, not alternating. What if the DOT Notation is ... DOT at the top of Secondary #1 and DOT at the bottom of Secondary #2 then the output coils operate in parallel, NOT Push-Pull ?
vto rsi Starting backwards in reference to your answer, your reference about the non existing dots cannot justify your (otherwise right) claim about paralleled secondaries. Moreover, paralleling is not drawn this way in schematics. Therefore, by the first sight, this secondary stage is usually found in push-pull (bi-phase) outputs. Apart from that any topology is characterized by its primary side and the secondary side fits the primary. Finally I have never seen a fly back topology with such a secondary. Your “what if” scenario doesn’t save the case. It’s only a hypothetic scenario.
@@ΠάριςΑζής Since there are NO DOTS - you cannot know the polarity of the output windings. In his video he DOES show both Diodes conducting *simultaneously* ( my way ) , not alternating ( not your way ) which does support the DOT NOTATION is my way, and NOT your way. You are assuming incorrectly - based on nothing ...
Please provide transformer specification.
it says, 45 turns primary, 4 turns +4 turns for secondary, and 8 turns for feedback
Can i replacing uc38343a ka3842
Can i adjust the voltage from 5v to 24 v
You can change the duty cycle, controling the voltage on VFA (pin2) in certain range. But you want to high range, it is depend of you chopper transformer too.
thanks .i wish set the schematic diagram.
porque se altera el voltaje?
Nice video
Thanks
what is the voltage of the coil that feeds the UC3843
18V
Primary voltage: 12.8V
Primary turns: 4+4=8
Auxiliary turns: 8
Auxiliary voltage: 12.8V / 8 * 8 = 12.8V
Sir, can you provide transformer specification.
Sir can you make a video of solar charge controller using mosfet? If yes ,please help us
Sir plz help me iam in trouble i need to testing uc3842 but sometime 5V generate on pin 8 or sometime 0V and I need to produce 20khz frequency signal at O/P pin but according formula 1.8/Rt*Ct no accurate frequency generate. I apply 16V vcc and 0.001uf cap or 10k registor for Rt/Ct pin and get 165khz frequency at output I wait ur reply or any other one who can understand my problem
This is caused by a UVLO protection of UC3842. Please use UC3843.
Please main transfer type and size.
Thangks it's easy to make
transformer winding wire no ✍
Boa tarde me consiga layout dessa fonte quero fazela ?
Good job.
Please elaborate in transformer design
can you gime me file pdsprj for this project?
Ferrite core number pls
What is core used bro?
Any ferrite cored power transformer salvaged from ATX will do fine.
We used EE42 PC40 transformer core.
Sir plz can u send me your 12v battery charger power supply diagram thanx sir
There is no feedback for voltage stabilization.
Yes, there is !!! The regulation is implemented using ... a) An Inner Current Loop and b) An Outer Voltage Loop ... You need to research Current-Mode PWM IC's ...
This supply diagram is work only on 110v, this diagram is copied from uc3843 application data sheets
This schematic can work also for 220V, because of the feedback system, but feedback resistors have a wrong values.
@@katarzynan.8500you are wrong. I have tested this circuit it destroyed because of startup resistors value 56k 2w in case of 110v , for 220v it's value is 220k because 3843 require 1ma current. Don't mislead people's. You have not tested this circuit practically. It's my challenge to you if you can run this circuit on 220v without changing resistor values. If you try with 220v it will burned.
@@ftspakelectronics8135 What if i want power supply to run with universal mains voltage. Can i use 100K for startup resistor to run in universal mains?
@@katarzynan.8500 use 150k
@@ftspakelectronics8135 hi sir can you please give me ur email id please??
Please tell us core size ......?
Please tell us core size & copper wire diameter....?
There is no full wave rectification here as it is flyback !!!!
that's the function of the snubber
Please detail - VFV, CFV, SC etc. not explained here.
Sir diode FR107 this is the ordinary diodes i means 1N4007
Its a fast Recovery diode suitable for high frequency switching and rectification
@@ELECTROBUFF thanx sir and plz sir u making a 20A charger circuit thanx sir
@@charsadwalhalak5245 th-cam.com/video/cA2R3ZT6PCE/w-d-xo.html
You can use UF4007 diodes.
Nice circuit but there's no No feedback this circuit won't work well, if at all it gives 12 v, when load is applied the voltage will drop
There is feedback but it is done by using the auxiliary winding, working on the assumption that the voltage from that winding tracks the main output winding. The accuracy of voltage regulation won't be very good but it can be acceptable for some applications.
Some modern ICs, typically fully integrated with the control circuit and power switch in the same IC, are designed to use that sort of arrangement for feedback, but the design is such that some of the shortcomings are minimized.
Demostration
Diagram please
No funciona. Tiene voltaje pero amperios no.
Sir 5v5a SMPS digrame plese
Hi..i'm vietnam..i like your video..give for me video switching power 48v,please
Please use this schematic, but the secondary winding should have 16 turns.
En Español, la explicacion, please
❤❤❤👌
500 transistor could not handle this circuit.we need 900 v transistor
With 320 VAC input and the turns ratio of the inductor you'd get about 600 volts across the FET when it turned off, ignoring the leakage inductance spike. You might not need a 990 V part but you'd want something rated at over 600 volts.
unwanted background music
Daigram ka photo sath me atech kriye
Aapane Jo compound diagram mein Dala Ho bahut galat hai
where is schematic
Schematic is on video.
الموسيقى أفسدت كل شيء
like bro
Ji
7 number peene per Kitna vote chahie kam se kam hai
Very noise electric😢
Pirimer. Ve sekender. Tel
Sargı kalınlığı .
Artık orasıda nekadar akım geçecekse o kadar kalın olacak
R3 should be 1.5k.
R4 should be 12k.
D1, D2, and D3 should be a UF4007.
or
Auxiliary winding should have 4.1 of a turn.
D1, D2, and D3 should be a UF4007.
Please provide transformer specification.