How to design Transformerless Power Supply circuit Explained with Calculation
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- Опубликовано: 20 июл 2024
- In this video, I have explained how to design a transformerless power supply to supply small DC loads. I have also shown the calculations for designing the AC to DC transformerless power supply circuit with some simple formulas.
**This circuit only can be used for small static DC loads like LED.
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WARNING:
This video is for demonstration and educational purposes only.
Each demonstration presents risks and hazards that must be fully understood before attempting.
And should be performed only by professionals
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Find out more such projects: easyelectronicsproject.com/pr...
You can download the Gerber file for the PCB and order it from
www.seeedstudio.com/fusion.html $4.9 for 10 PCBs From Seeed Fusion
I would like to thank you Seeed Studio Fusion PCB service for sending me the prototype PCB for this Transformerless AC to DC power supply.
Required components list for this ac to dc power supply circuit:
1. 1uF 400V AC Capacitor 1no [C1]
2. 270K ohm 0.25-watt resistor 2no [R1 R2]
3. Diode (1N4007) 4no [D1 to D4]
5. 100uF DC Capacitor 1no [C2]
6. Zener Diode 5.1V 1no [Z1][choose the zener diode as per the required output voltage.]
7. 100-ohm resistor 1 watt 1no [R3]
8. 220 ohm 0.25-watt resistor 1no [R4]
9 5mm LED
8. AC connector
Please check all the required electronics components before soldering on PCB.
#TransformerlessPowerSupply #ACtoDCpowerSupply #TechStudyCell
In this video, I have shown how to convert 220 volt AC to 5 volt DC using this power supply. To make a 12-volt dc power supply you have to use a 12 volt zener diode instead of 5 v zener. While making the bridge rectifier circuit I have explained how to place the diodes on the PCB.
In the end, I have discussed the working of the transformer less power supply with calculations so that you can modify the circuit according to the requirement.
To supply the small DC load this is a very simple and useful power supply. After watching this tutorial video you can easily design the DC power supply circuit at home.
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You are very organized. Makes the explanation of the circuit very clear, very visible. One of the best Electronics channels I've ever seen on RUclips. And the best ????? Without those horrible songs that take the focus away from the explanation. Very good ! Congratulations !!! 👏👏👏 (from Brazil)
Thank you for the feedback... we will correct it
@@TechStudyCell you should have explained the rest of the circuit as well how you got the 450 micro farad and the first resistor and the other...
Thank you very much for this clear video, Now I understood how my home rechargeable torch light works. I am becoming fan of you. :)
Your teaching style is beautiful. Thank you.🙏❤
How did you calculate the value of the bleeder resistor and the 100ohm/2watt resistor in series with the neutral and the value of the smoothing capacitor
Explained nice and clearly. Good job.
Thanks for the feedback...
Hi thank you for your video and the time you took in making it. Is it possible to use this type of circuit to drop ac to a lower ac voltage. I have two 220v 30w LED flood lights. I want to reduce the voltage to about 200v for maximum led life. The LED are very bright and I think are being over driven. The units are sealed so I can not get inside them to lower the DC voltage. Is my only option to install a mains dimmer switch? Help, advise please.
The videos was very good and informative, you calculation and description of the components are good. If you can explain the about resistors and their values that would be great.
explain really well, is it possible to power this circuit without a load ? In the video you use a motor as a load.
why 100 ohm resistor is used at the AC input and how to determine the filter capcitor uF and voltage rating for the rectifier circuit?
well done, i have a question regarding the zener, does the zener has current limit?
Thank you very much for your video, can I have a question on avoiding of shocking on touching the output:
1. Can we you a phase cut at 5 VAC wave from using Zero cross protection stuff like MOC3021 and a small micro controller, triag to handle the trigger for wave form cut so that the overall voltage will never bee too high?
2. Of course with this, the synchronous wave form will be cut and have some time no power, can we use capacitor/ inductor to supplement the loss of power during the cut of AC wave form?
This power supply is only for small constant DC load. I will suggest you to use SMPS power supply.
Great! Good explanation about how to select the polyester capacitor based on the required output voltage. Thanks for sharing.
Thank you for being so clear in your instructions: I really appreciate the time and effort you put into this tutorial. Thanks from Australia.
Welcome... But don't use this circuit for variable DC load.
@@TechStudyCell what mean.. what kind dc variable load?
bro my 100 ohm resistor died 💀
@@slimeedude LMAO
@@slimeedudethis is a fuse resistor meant to blow off in case of overload and hence project the main unit
Hi, can you please tell me what the R3 does, couldn't you connect it directly to the full bridge rectifier and ignore adding it? If you or someone else can shed some light on my question I would be forever grateful.
Explained pretty smooth and crystal clear. My question is, what will be the voltage after the 470micro f capacitor (C2)?
I think it depends of the frecuency, because the voltage in that point depend of the percentage of charge in C1...
5.1v as clamped by the Zener
Kindly suggest component values to get 48v dc output from 230v ac by using above method.
Can I use only a resistor to imitate the value of the Impedance? like a resistor with impedance 3192.6?
Why you have used that 2w resistance and how you calculated the resistance value
If I want 5V, 2 A current DC output without any transformer (with 2 DC capacitor and Inductor) what will be the circuit diagram?
Thank you for this video. Is R3 really important? Why?
Excellent explanation
Hi! the voltage at point B is much lower than the voltage at point A because the capacitor C1 has no time to completely charge?? If Im right, is not this ciruit dangerous? because if the capacitor breaks, the voltage in the output is too big... (Im not sure if the zener can keep it low)
The output still almost 200volt with out a zener
How to determine the resistor which is connected parallel with this 1uF capacitor??
Hi, why are you use ac capasitör is 1.5 uf ? You calculate approximative 1 uf.
Where can i go to catch up and learn what each one of these devices does?
what happens if and when C1 shorts out? 220 thru everything?
Useful video 👍 very good
Thanks...
Good job. How did you calculate the value of the current limit resistor and also how did you calculate the value of the smoothing capacitor
These are arbitrary values:
The smoothing capacitor value needs to be as large as possible (but the larger the capacitance, the longer it takes to reach/charge the required voltage).
The current limit resistor consumes a lot of resistive power and also not necessary during the operation, but can useful for sudden voltage spike in AC mains.
Respected Sir If i need 12v output , it is enough to do change the capacitance value.. help me
Sir, R1 &R2 are 270 k but in video u r telling 220 which is right? U r using one 2w resistance but in in details u have written 1 w what is correct ? Pl explain regards nice tuitor
In your calculation, your AC capacitor value to be used is 1uf....but practically you are using the capacitor marked 155 J the value 1.5uf. I think you should be using 105 (1uf) to be exact instead of 155 (1.5uf). I wonder if there are changes in the output voltage at point A if the capacitance of the AC capacitor are changed. Please clarify.
His schematic n pcb is diffrent
I made it.Awesome Project.Whats the difference between tramsfomerless and transformer powersupply?
Great job
I require that C2 ( capacitor value )
Please calculate method & including all formula.. I am waiting
Thank you for a very good explanation
you have forgotten to add a series resistance with zener diode (current limiting resistance )
I need 2amp current which resistane (ohm) i use?
@@amitsolanki2321 I guess increase in capacitors in parallel will increase the current
can we measure the output voltage of transformarless powersupply wihout connected to the load?
Will this circuit show 5V DC without any load ??
Can i use capacitor of 2.2 micro farad instead of 1.4 micro farad?
What is the safety of circuit that can handle load and any surges at Input to circuit and not damage the output application?
How can I get 2A current with this design?
Open unused surge suppressor and use those components or order the exact for use at the Pcb's AC mains connection.
Sir from where you got the printed pcb , I need some pcb
thank you, can we power a microcontroller using this supply
How much maximum current allowed for averall the power supply circuit when we connect to any larger load?instead only LED...how to estimate it?
Bro excellent project. I have been requesting you to provide complete project kits (sale) those who wants build the same..
if i use 105k then which resistance i use 100ohm 2
watt???
Simple, Salvy. An L7806 is more costly than a zener
How if i need 24 volt dc?.. could you give the values of all the component?
Whare u use 1uf capaciter, u using 1.5uf cpaciter ?
Can we use this for esp32?
Witch capastor use for 12 volt
how can i get 1 amp output current cz i wanna glow 40 rgb leds connected in a parallel
Hi, A good effort of details in your video. It does not show the AC voltage before the bridge and DC voltage after the bridge prior to filter.
This is the only video as to how to choose correct particular based on physics calculation.
What is the value of DC capacitor you have used
Do you have circuit in PDF or JPEG format? I want to make pcb at home instead of ordering on online store. In my country, it's expensive.
Hey Man, Is it possible to have a Dual 12V AC transformerless pwer supply?
Hope you can rply this
You had a bunch of different loads in your circuit. Can you please tell us how they are connected to the output? Excellent video, thank you.
Some small DC load connected in parallel with the output of the circuit
It is a great project, the indicator LED, the motor etc. Thank you for sharing, really enjoyed it. Keep inventing!
good tutorial
Thanks
Sir gi your explain is very Quite Amazing
Where did you get (2x3•14)x50x3912.6
What about using same circuit, but I need 36v 5A. Please help up, thanks 🙏🏻
For high current please use SMPS power supply
Electrolyte capacitor ki value kaise nikalte hain wo batana sirji please
super bro thank you very much
Very cool project...but I really dont know what the function of R3?
Please, how much value for bleeder resistance
How can change DC polarity for Motor reverse Forward?
Sir ye 4v batry charger bana sakty hy
Sir plz help transformer less 12v supply my filter capacitor is heatup what reason
Consumers friendly technological designing are always different from business friendly. So many extra components and complicated designing are good for business.
Hello Sir, Can I able used this circuit for the load of 5V , 500mA...?
No
About 100 mA?@@dharani312
What is the value of bleader resistor
For 150volt dc pls let me know the value of component
can you explain, how you get the value of r1 ,r2, and r3
Many thanks.🇬🇧😷👍
Why do you use a 2 Watt resistor, when you only need 0.1A at output?
Sir good morning, no Gerber file in description ?
could you please make a video same for 24dc 10 amps to 12v dc 5amps
good great job why did you use a zenner dioade if you can used a L7806
Yes, L7806 can be used instead of Zener.
there is a huge difference between the input and the output voltage witch is a problem in linear voltage regulators because the Vout/Vin factor is very small
because lm7806 have current losses
why we need the 100 ohm resistor and what is the output ampere of this power supply?
WOULD GREATLY APPRECIATE IF YOU. COULD MAKE A VIDEO OF LED EMERGENCY LIGHT SIMILAR TO " DP LED " SERIES 'EMERGENCY UNITS THAT ARE AVAILABLE IN MARKETS.
What determined the value of C2 and R3?
I tried this circuit, I got output as 5v DC but when I touched the output I got shocked.And I checked with tester it was glowing, Why this happened , v have completed AC to DC .There should not be any shock for 5v.pls help me
This is the draw back of transformer less power supply because the line is available all the points of circuit and may get shock this was used only for small chargeable torch 3v battery. Now led is popular so people started using it more. The reason is voltage has reduced only across zener. But voltage w.r.t ground where we stand is still 230v . Please subscribe my channel to see such videos
The output voltage got reduced to 5V only because of the Zener Diode, hence if you measure across zener you will get only 5V, however if you measure between any one end of Zener and ground the voltage will be still close to 230V, the big capacitor at the beginning is only limiting the current but not stepping down the voltage(a transformer is needed for this). If you completely insulate yourself from ground and touch the ends of Zener then you won't be zapped!!( Don't try this).
Remove the load n check the output still high voltages only the current very small it will not give any lower voltages except the zener
Want to try making it
great instructions, but your formula C= 1/ 2x3.14 x50 x3192.6 = 9.975 (not 0.97). still about 1uF but not accurate or i am still missing something???
Didn't explain where you get such big capacitor and how much
For those that as of Amp rating, this is in the area of 10 to 50mA, depending of the input cap
A 470nF X2 cap gives some 10mA
This is not isolated power suplly, it has potential to ground or null in the range of 220V, it can shock or kill if you make a contact whit it
Not sure how you're reaching the figure of 6v across the input to the bridge rectifier. You're dealing with AC up to the point of the bridge rectifier, so your 6v would rectify to root 2 times that, minus 2x the forward voltage of the diodes you're using in the bridge. That's 8.4v minus 1.2v = 7.2v. dc output of the bridge. This would hammer your zener diode, (which should also have a series resistance to protect it?) I can't see how you can try to use DC voltages on the AC side of the rectifier. It just doesn't make sense to me.
The AC and DC capacitor name are not clear. Please write with voltage limits.
Please show the calculation for choosing the correct capacitance and voltage value of the filter capacitor .
formula for that is C = I / 2 x f x Vpp, where I is the load current, f is the AC frequency (usually 50 Hz or 60 Hz, and Vpp is the allowable ripple. Choose a cap 50 volts or higher, not critical.
What caused the 100 ohm resistor to explode
How many ampere at 5v sir thank's.
How much amp?
Nice
Thanks
@@TechStudyCell thumara o PCB bord kitna rupay liya . tumara pas ha ? To ham khaird kar langa 1pc .
how many Amp current it can offer?
In mili amp range
How much current in this circuit?
How many ampers?
btw, the impedance seen by the source is the parallel network of the capacitor and the resistor ..
What is the use of 100 ohm resistor
Current restriction
This ckt.will certainly give a shock! 100mA output is very high. Actually such high currents should never be drawn from non-isolated sources. Fortunately Triac gating circuts that need 5 voIts on the input side will work very well even at 10 mA! So will be much safer to reduce current! Another trick to make it safer will be to have another capacitor with bleed resistor on the 2nd instead of the 100 ohm resistor! This way both wires on AC side of rectifier will become safe to touch.
Can you please send me the pcb board link
Hello..can you pls tell me if I want 12v at point A, with 300 mAmp, what should be the capacitance , I calculated however I m not sure...it is coming like 0.00000292712626451....can you help here
that means
2.9 microfarad (uf)
What is shipping cost of pcb shipping to india?