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You are here: Home / Home Electrical Circuits / 5 KVA to 10 KVA Automatic Voltage Stabilizer – 220 Volts, 120 Volts

5 KVA to 10 KVA Automatic Voltage Stabilizer – 220 Volts, 120 Volts

Last Updated on March 1, 2021 by Swagatam 56 Comments

Voltage stabilizer in the range of kVAs are powerful AC voltage stabilizer units specially designed for controlling and stabilizing high voltage fluctuations, for high power electrical equipment.

In this article we discuss an easy to build a 7 stage high wattage in the order of 5000 to 1000 watts stabilizer circuit which can be used  for controlling our mains AC line fluctuations and for producing very accurate stabilized voltage outputs for our domestic electrical appliances.

Circuit Operation

The proposed Accurate 7 relay OpAmp Controlled Mains Voltage Stabilizer  Circuit concept is rather very simple. It uses discrete opamps wired up as comparators to sense the voltage levels.

As can be seen in the diagram, each opamp's inverting inputs are provided with sequentially incrementing voltage reference levels through a series of presets which drops a certain amount of voltage across itself.

Each opamp compares this voltage with the common sample mains AC voltage level supplied to the opamps non inverting inputs.

As long as this sample voltage is below the reference level the respective opamps keep their outputs low and the subsequent transistor relay stages remain inactive, however in case the voltage levels tends to shift from its normal range, the relevant relays trigger and toggle the transformer taps so that the output is appropriately equalized and corrected.

For example if the input AC voltage tends to fall, the upper relays may get triggered connecting the relevant higher voltage taps with the output and vice versa in case the voltage shoots upwards.

Here the opamp output inter-connections makes sure that only one optocoupler and therefore only one relay gets activated at a time.

Parts List

  • P1---P8 = 10 K Preset,
  • A1---A8 = IC 324 (2 Nos)
  • R1---R8 = 1 K,
  • All diodes = 1N4007,
  • All relays = 12 volts, 400 Ohms, SPDT,
  • Opto Couplers are all = MCT2E or equivalent,

Transformer = Pink Tap is normal voltage tap, the upper taps are in the decrementing order of 25 Volts, while the lower taps are in the incremental order of 25 volts.

Full circuit diagram of the proposed Accurate 7-Stage OpAmp Controlled Mains Voltage Stabilizer.

IC LM324 Pinout Details

 

Circuit Diagram

7 relay voltage stabilizer circuit

Upgrading into a Solid State Version using SSR

The diagram below shows a rather simple voltage stabilizer design which can hold huge output power in the range of 5 to 10KVA. The use of SSR or solid state relays makes the output stage easy to configure and very accurate - thanks to the modern SSRs which are designed to trigger massive power in response to smaller input DC potentials.

Circuit Description

The proposed circuit of a simple high capacity automatic voltage stabilizer circuit is easy to understand. All the opamps are arranged in standard voltage comparator modes.

The presets P1 to P7 can be adjusted as per the required tripping points, which will correspond to the output SSR switching and the subsequent transformer tap selections.

The central green TAP is the normal voltage output, the lower TAPs gradually produce higher voltages while the upper TAPs are set for lower voltages.

These TAPs are chosen by the appropriate SSRs in response to the varying AC voltages, thus adjusting the output voltage to the appliances close to normal levels.

This circuit was asked by Mr. Alexandar and the SSR data was provided by him.

Parts List

  • R1 to R9 = 1K, 1/4 watt,
  • R10 = 10k 1/4 watt
  • P1 to P8 = 10K preset,
  • C1 = 1000uF/25V
  • VR1 = 10K Preset,
  • opamps = IC 324,

Transformer = Input 230volts or 120volts, Taps - incrementing/decrementing voltage levels (TAPs) as per individual specs.

SSR = 10KVA/230volts = output, 5 to 32 volts DC = input

Full circuit diagram of the proposed A Simple 5 KVA to 10 KVA Automatic Voltage Stabilizer Circuit @220 Volts, 120 Volts

Solid State SSR Voltage Stabilizer Circuit Diagram

SSR Image

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About Swagatam

I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer. I am also the founder of the website: https://www.homemade-circuits.com/, where I love sharing my innovative circuit ideas and tutorials.
If you have any circuit related query, you may interact through comments, I'll be most happy to help!

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  1. Search Related Posts for Commenting

  2. john whittingham says

    yes. that looks much better! lol

    Reply
  3. john w says

    There is possibly a resistor missing from the bottom of VR1 to ground in my opinion since there is no voltage divider effect created by VR1 other than with the load to ground formed by the parallel inputs of the 8 op amps +input pins. VR1 is only 1K so a much lower resistor value than that of the 8 parallel +ve input pins would be required. I seriously doubt that this design will work without it since the zener is 6 v, the -ve inputs are between about 5.5 and 0.8 volt while the +ve inputs will be up at about 15v. Perhaps VR1 around 20k and the resistor to ground from it around 10K? R9 seems low at 1k as well. The taps should not be 25 volts apart. They should only be about 10 volts apart unless you live in an area with extraordinarily poor quality power!
    Where i live being able to regulate mains inputs like 260 250 240 230 220 210 200 190 to the output you want such as 220 or 230 would be correct and the taps on the extreme ends would never be used. If you live in a rural area with a very long transmission line and extreme voltage drop you may need 15 v taps but it’s hard to see anywhere you would want 200 volts variance (8 times 25) as your range. The trimpots have to be adjusted so there is overlap and NEVER a state where all outputs are off unless Vin is very low and you want brownout protection. I would try : increase R9, add the resistor i mentioned, alter VR1 and lower the tap voltage. A couple of 0.1 uf ceramics from pins 4 and 12 to ground wouldn’t hurt either To bypass spikes and RF noise and protect the I.C. The transformer should have an overheating cutout in it to disconnect the whole thing so it can’t cause a fire in the event of malfunction such as two shorted ssr’s shorting the windings.

    Reply
    • Swagatam says

      The preset itself is very much capable of providing a voltage divider effect right between 0 and the max supply voltage. Remember the op amp inputs are high impedance inputs so it really doesn’t mater whether you are using a 1k or a 10k, or a 100k. It is the ratio of resistance between the slider/positive and the slider/negative that matters.

      You can add resistors at the positive side and negative side of the presets to squeeze the window of the adjustments, to make the adjustments a little easier, although that is not necessary.

      Capacitors can be added across as many nodes as possible to protect against any form of spikes or transients…

      Reply
    • john w says

      i think you are looking at the wrong diagram. VR1 and the SSR’s dont exist on the first version. Im clearly looking at the second version so perhaps look again at my comments

      Reply
      • Swagatam says

        Yes, the VR1 in the second diagram needed a correction, I have changed its name and configuration accordingly.

        Reply
  4. amin says

    Hi sir.
    Please help me with the new generation Stabilizer.
    igbt based voltage stabilizer

    Reply
    • Swagatam says

      Hi Amin, I do not have this circuit with me at this moment, but if I find I will post it for you….

      Reply
  5. SURYANARAYANA says

    Please provide a circuit for 220VAC and 110VAC stabilizer having an auto transformer with taping of 94V, 109V,127V, 148V, 171V, 199V, 215V, 231V with relays.

    Reply
    • Swagatam says

      You can try the first circuit from the above article and customize the relay contacts as per the tappings of your transformer.

      Reply
  6. Isaac Kofi says

    Hello Swagatam,
    great works and thank you for being supportive to students especial on their project works.
    I am one of your followers. My question is if you want 1P7S transformer winging coils how do get that from multisim.

    Many thanks

    Reply
    • Swagatam says

      Thank you Isaac, sorry I do not know much about it since I do not use simulating softwares very often

      Reply
      • isaac says

        Thanks very much for your quick response swagatam. I will be counting on you for your coaching on a project I am currently considering to develop for my research.

        God bless you.

        Many thanks
        Isaac

        Reply
        • Swagatam says

          You are welcome Isaac!

          Reply
  7. Taofeek says

    Thanks a lot, Mr Swagatam. May God bless you. Please Sir, I want you to show me full video on how to make 1500w including battery charger. Thanks once again.

    Reply
    • Swagatam says

      Thanks Taofeek, I presently do not have the video now but in future if I make one I will surely update it for you….

      Reply
  8. John Urbanovsky says

    i was wondering if you have a 120 volt input and 120 volt output ac circuit stabilizer

    Reply
  9. sangilidevan says

    what is the part number of transfomer..plz send that

    Reply
  10. Mohamad says

    Thank you for sharing

    Reply
  11. Victor says

    Hi sir, What is the value of C1 and the meaning of P.

    Reply
    • Swagatam says

      Value of C1 can be 1000uF/25V

      Reply
  12. Adeyemi says

    Happy New 2020, thanks for all your supports Swag. For this circuit, is it possible to use a small transformer of 14v to power the Ic circuit instead of tapping the 14v from the auto transformer. But the auto trafo will be used for the large volt tappings. Thanks

    Reply
    • Swagatam says

      Wish you too a Happy 2020 Adeyemi. Yes that’s definitely possible.

      Reply
  13. arun says

    Please, advise why pin 4 is of ic1 is not mentioned, IC near to SSR1..?
    if we build a 5kv and output voltage is designed 230 v, upon full load, the output voltage will drop to 210v, so how we can keep the output voltage also stable in 230v…?

    Reply
    • Swagatam says

      The position of pin4 is not important in the diagram, it can be seen near the top op amp, pin4 goes to the positive supply

      Reply
      • arun says

        if we build a 5kv and output voltage is designed 230 v, upon full load, the output voltage will drop to 210v, so how we can keep the output voltage also stable in 230v…?

        Reply
        • Swagatam says

          For that you will have to use a transformer that’s rated at 3 times more wattage than the load, in your case use a 12000 watt transformer

          Reply
      • arun says

        Sir,

        I am confused between triac and SSR, can you please what is main difference,
        I saw a voltage stabilizer cicuit diagram by you using triac. please explain what is the differnce..TKS

        Reply
        • Swagatam says

          Arun, An SSR is a complete module with all the necessary protections built-in…a triac alone may be more vulnerable to damage compared to an SSR.

          Reply
  14. Kenkenny says

    Sir swaggatam.
    Please I will need your help on a circuit, an AC ADAPTER,19v .3.42A,

    Reply
    • Swagatam says

      Hi Ken,

      You can tell me your requirement, if possible I’ll try to help!

      Reply
    • john w says

      use a laptop power supply. so easy to buy on ebay or any computer store

      Reply
  15. Helal Uddin says

    please,send transformer data sheets of 5kva and 10kva

    Reply
    • Swagatam says

      Sorry, I don’t have it with at the moment!

      Reply
  16. Tolu says

    Assuming a tap is at 170V the next will be at 195v(25v) increment, but the input voltage is at 180v, how will it handle it. Because 180v is in between the taps

    Reply
    • Swagatam says

      Please check and learn how an auto-transformer is designed to work… then try to attach the auto transformer taps into the above circuit accordingly.

      Reply
  17. ola says

    Pls can I get a circuit diagram for a 5kva Automatic voltage stabilizer

    Reply
  18. kaluya moses says

    Hi my boss swag, this is kaluya moses from Uganda your old student / a follower.
    Honestly, thank you for the wonderful job you doing to serve the world electronically God bless you . long live swag.
    In fact price of electronic mr swag , I will would like to help me the type of sort ware you use to design or to make schematic diagrams/PBC.

    Reply
    • Swagatam says

      Thank you Kaluya, I am glad you are liking my website! I use Corel-Draw for designing the schematics and PCBs.

      Reply
      • kaluya moses says

        Thanks a lot prince of electronics mr Swag, I still need much support from you because i have circuits to design and if at all I need someone to do it for me, what should I do? before I learn to do it myself. please advise me mr Swag. Thanks.

        Reply
        • Swagatam says

          Thanks Kaluya, There are probably many PCB softwares online which you could try, but without learning them it could e difficult. Or you may be you can contact a PCB designer for the job.

          Reply
  19. naingzawlin says

    what is the data of Z1 ?

    Reply
    • Swagatam says

      you can use a 6V zener.

      Reply
      • naingzawlin says

        thz

        Reply
  20. Kingsley says

    Hello Dear Swagatam, Please can you guide me on how to setup the two opamps (lm324) for ensuring appropriate shooting/kicking of the relays without crash. Again, at what DC equivalent of 220VAC do I keep the pink (220VAC) tap swiched ON while other stay OFF and vice versa? Please help. Thanks.

    Reply
    • Swagatam says

      Hi Kingsley, you just have to adjust the presets from bottom to the top in an incremental order, such that the lowest relay activates at the lowest voltage threshold, the second lowest at the second lowest threshold and so on until the top preset which activates the topmost relay at the highest voltage threshold..

      The lowest threshold could be 150V, and the highest could be 300V.

      Reply
    • Kingsley says

      Thank You very much my dearest electronics mentor! I sincerely do appreciate your effort towards keeping young electronic hobbyists updated. I will try the setup and get back to you with observations.

      Thank You once again.

      Reply
      • Swagatam says

        Your are welcome Kingsley, wish you all the best!!

        Reply
  21. dennis rollo says

    hi swag.please help me with the diagram of electrical series testing board and how to use it.i think it is advisable when testing any short circuit problem.i saw it in youtube but i don’t understand hindi/urdu.thanx

    Reply
    • Swag says

      Hi Dennis, for testing an electrical system where a short circuit could be possible, the best technique is to use a lamp in series with the supply. For example you can use a 100 watt series bulb and then freely test the system, if at all a short circuit happens, the bulb will light up preventing any kind of burning or fire hazard issues. This is the most basic idea for safely carrying out a short-circuit prone experiment, if your system is more complex or require a more sophisticated cut off system, then please specify your experiment I’ll try to solve it for you.

      Reply
      • dennis rollo says

        ok thanx.i’ll try it first.i want to try it in servicing a tv or any other electronic products.if i have a circuit that i don’t understand,please help me.thanx again.

        Reply
        • Swag says

          Sure dennis, let me know if you face any problems.

          Reply
  22. candra says

    hi swag,
    what kind of transformer to use?
    how many Ampere to meet 5kva – 10kva?
    or just only any transformer do well?
    thanks..

    Reply
    • Swag says

      Hi candra, you will need a transformer which may have a 220V or 120V entry and several outputs producing higher than 220V/120V values in steps, and also lower values than 220V/120V in steps. you will have to contact a professional transformer designer and make to order it or try acquiring readymade from ebay or amazon.

      for getting ampere, divide the wattage with the input voltage

      Reply
      • candra says

        ok. thanks

        Reply
  23. NISHANT KESARWANI says

    Sir,
    Can you explain igbt based static voltage stabilizer with DSP control popular nowadays.If possible please post a circuit of it.

    Reply
    • Swag says

      Nishant, I think I have a similar concept published in this website, you can find it at the end of this post

      https://www.homemade-circuits.com/smps-mains-voltage-stabilizer-circuit/

      here instead of a transformer I have recommended using large electrolytic capacitor which can add equivalent power to the load during low voltage situations.

      Reply



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