3 phase Solar Submersible Pump Inverter

The post explains a simple  3 phase solar submersible pump inverter circuit which can be made by configuring a few ICs and a few power devices. The idea was requested by Mr. Lufono and Mr. Sami.

Solar Inverter for 3 Phase Pumps


First of all i must say thanks to you and  Mr. Lufono, i have many solar projects of solar tube well and want to make a three phase inverter and i connected 14 to 23 solar panels of 250 watts every solar panel 31 volts 8amp in series than i have 450 vdc to 750 vdc .my submersible pumps 5.5kw to 7.5 kw 3phase 220v and 380v 3phase. plz i also request that in the circuit auto motor speed control also needed, means when solar panel voltages up or down with the time and sunlight motor speed also adjust automatically. if igbt needed GP50R12KT3 or other no problem plz help me so so thanks .

Sami

The Design


I have already explained a simple single chip 3 phase full bridge inverter circuit, the same IC can be used for the proposed solar pump inverter circuit. The standard configuration of the 3 phase driver IC IRS2330 can be seen below:

Circuit Diagram




However since the mentioned 3 phase driver requires a dedicated 3 phase signal across its triggering inputs marked as HIN....LIN, it would be first important to learn about a simple 3 phase signal generator circuit using opamps which could be integrated with the above design for the intended outcome..

It doesn't need to be a sine wave 3 phase signals a simple square wave 120 degree phase shift PWM generator could be used for the application, as illustrated below:

3-Phase Generator Schematic




The above 3 phase generator circuit can be further modified in the following manner so that it can be fed to the 3 phase driver IC shown in the first image:






Using BJT Buffer Stage


Here we see how the outputs from the 3 phase generator opamps are buffered using transistor inverters for producing the required 3 out-of-phase channels for the HIN...LIN inputs of the IRS2330 3 phase inverter driver IC.

The load connected with the driver mosfets or IGBTs now would receive a square wave 3 phase operating voltage, which could be a submersible pump motor in our application as per the request.

In case the IC IRS2330 looks difficult to acquire in the local market, the following cheaper half wave solar submersible inverter circuit concept could be implemented, although with 50% less wattage efficiency.



The BJTs could be replaced with appropriately rated mosfets or IGBTs...rest of the configuration is pretty straightforward and does not need much explanation.

Need Help? Please send your queries through Comments for quick replies!




Comments

hello Sir I want 240vdc to 240vac single phase 2kw invertor and it's circuit diagram please suggest me sir
Swagatam said…
hello ragahvendra, you can either the above concept or the following one

https://homemade-circuits.com/2016/04/solar-inverter-circuit-for-15-ton-ac.html
sir I want contact with you by phone can you call me sir my number 919740790078 or give me your number sir please
Swagatam said…
sorry, a telephonic conversation may not be possible.
vhafuwi said…
Thanks for the quick respond , I am testing the above circuit on a breadboard , once all is well i will fabricate it on a pcb and post details , thanks again for a straight forward circuit for my solution
Swagatam said…
you are welcome lufono, please make sure you build and it stage-wise
vhafuwi said…
Hello Swagatam, it is going to take a while to receive the IRS2330 I have ordered from Aliexpress . in the meantime I want to use your suggested cheaper half wave solar submersible inverter circuit concept , since LF411 available Locally.My question is how do i connect LF11 to the circuit , and is it one LF11 or three, and for a 0.55KW Load , what will be the suitable IGBT or Mosfet. Will appreciate your assistance
Swagatam said…
Hello Lufono, you will need four LF411 ICs, and connect each one as shown in the article.

the mosfets could be IRf450 since the voltage is at the mains level.
Thanks sir i have no wards to say thanks and i say u my best teacher at e help.so so so thanks .May u live long with peace.
Swagatam said…
Thanks positive thinker, the pleasure is all mine!!
vhafuwi said…
Hello Swagatam,is there any replacement for LF411 on the alternative circuit
Swagatam said…
Hello Lufono, you can use any other opamp having features like high slew rate, low power consumption and high speed performance....although these are not crucial for the suggested design but will help to achieve better overall response....you can try IC741 also and see if works or not....I believe it would also work.

make sure to use a 3V zener diode with the base resistor of the respective transistors to prevent small offset voltage causing false triggering of the BJT
Good day
I have a 24v solar pump that uses a 24v controller to run the brush less motor of the pump i would like to know how to build that controller the pump has 3 wires running it
Swagatam said…
You can use the concept which has been explained in the above article....
I rebuild the circuit on every-circuit but cant seem to get it working where does the negative for solar panel feed on the have wave circuit
Swagatam said…
interpreting a simulators output can be difficult for me.

all the connections which are marked with "ground" symbols must be joined with the negative of the supply.

additionally the opamp supply pins will also need to be connected with a 12V voltage supply.

I hope you have connected all these appropriately.
Athri H D said…
If we replace bjts by mosfets don't we need MOSFET driver?
Swagatam said…
yes that's right, you can try inverting the configuration, use P channel for the upper mosfets and N channel for the lower... and add 3V zener diodes to their gates for allowing a dead time.
ABHISHEK Gupta said…
Sir I want to make three phase inverter
12v DC to 240v AC supply please sir guide me
Swag said…
Abhishek, I already have this circuit in this website, you can search it using the search box on top....
ABHISHEK Gupta said…
Thanks for reply sir
Can I use single phase transformers in replace of three phase transformers
ABHISHEK Gupta said…
Can I use LM 324 in replace of LF411
Swag said…
how will you connect a single phase transformer in this design??
Swag said…
yes you can try LM324...somebody told me that the opamp circuit does not work, but I don't believe it because the circuit was referred from one of the top technical websites and looks correct to me..
ABHISHEK Gupta said…
Out put of mosfet connected to the input of transformers as single phase transformers

How increase voltage from 12v to 240v
B
ABHISHEK Gupta said…
Thanku so much sir
I will go to try this
ABHISHEK Gupta said…
Sir please provide circuits With pin diagram of three phase signal generator
Swag said…
please show me with a schematic how the single phase transformer would connected with the above circuit and also how the trafo's output could be connected with a 3 phase load.
Swag said…
you can try the following one instead, which is a tested design.

https://homemade-circuits.com/3-phase-signal-generator-using/

please note that the 3 phase inverter circuit is a hugely complicated circuit and absolutely not recommended for newcomers, build it at your own risk if you are not an expert in this field...
Giel said…
Hi Swagatam,

I am staying in South Africa with nice sunshine conditions
I want to run my single phase swimming pool pump 0.75 kW directly from a solar panel - in the morning as soon as the solar panel preduce the correct voltage and amps the pump motor must start and in the evening when the sunshine fade the pump must stop. Have you got a circuit alraedy for this? Or can you tweak a circuit and design that will work?
Swag said…
Hi Giel,

I think you can simply try the last circuit based on IC 555 from the following article.

https://www.homemade-circuits.com/how-to-make-light-activated-day-night/

Connect the relay contacts with the motor, as soon as the sunlight is sufficient enough as per the selection of R1, the relay switches ON and operate the pump, and switches OFF as soon as the sunlight drops below the given threshold.
Giel said…
Thank you very much

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