Driving a three phase motor on a single phase supply directly through ordinary methods can be difficult and dangerous. It requires accurately designed circuits for implementing the operations. Here I have tried to present one such PWM controlled three phase motor driver circuit. Let's learn more.
The circuit can be understood with the following points:
Circuit Description
Before going to the following explaination it would be important to know regarding a three phase signal generator circuit explained here: https://homemade-circuits.com/2013/09/three-phase-signal-generator-circuit.html
The above circuit becomes the crucial part of the whole design because it's this stage which provides the 120 degree phase shifted signals for driving the proposed 3 phase motor driver stages from a single phase source.
All the involved circuits are operated from a common 12V DC source which may be obtained from a standard AC/DC adapter configuration using a 12V transformer, bridge and capacitor network.
In the first diagram shown below we see a simple 555 PWM generator circuit which generates equivalent modified sine wave PWM waves at its pin#3.
These are generated in response to sine waves from the outputs of the 3-phase signal generator circuit as explained in the above given link.
That means we would require three such identical 555 PWM generator stages for processing the three outputs from the 3-phase signal generator opamps.
The outputs from the respective three PWM generators as referred HIN and LIN are fed to the inputs of three discrete mosfet driver circuits, shown in the second diagram below.
We use the IC IR2110 for the driver part of the circuits, three separate IC drivers are used for processing the three PWM outputs from the 555 sections.
The outputs from the mosfets are directly connected with the three wires of the motor.
The 330V to the mosfets is derived by rectifying the mains single phase AC.
Circuit Schematic
Seun Akinyemi says
Hi all,
I am not into electronics like you guys. I came on this platform for solution for my 3-phase motor-driven machines. I am kind of stuck with the only available power supply in my area, which is single phase (1 live + ! neutral) mains.
I am presently toying with an idea of driving a 3-phase dynamo with a higher Hp single phase motor.
Please can it work and how do I do it. All wiring stuff is too advanced for me.
Thank you.
Seun, Nigeria
Shrishail Utagi says
Dear Sir
I m seeking a circuit diagram for single phase submersible motor pump starter/control panel. the circuit required must be made by low cost , easy available components. starter/control panel must contain low voltage/ hi voltage , overload protection, also. can you help me please?
waiting egarly
Shrishail Utagi
Swag says
Dear Shrishali, please provide the internal working details of the panel…the technical details of all the parts involved in the panel, I’ll try to help
Anonymous says
Sir, in pwm generator, there are two inputs shown in red. In your single phase to three phase generator circuit, there is only one output per phase. Could you please explain? Little confused. Thanks. Ranjan
B420ady says
Hello, I have a 3 phase HVAC compressor and my power grid is single phase 220 V , on the compressor label is saying 3 phase at 400V-50Hz / 440V-60Hz 6,3 Amps max
So I need something made for this power requirements and I could not find how big the load can be on this circuit presented on this page ??
I m a electronics amateur at best so I will prefer to buy it ready made if its possible.
Please tell me if you sell this circuit as kit or were I can buy it from.
Swagatam says
Hello, sorry I do not manufacture kits so wouldn't be able to sell it to you, but you can easily buy these ready-made from many online stores such as ebay, amazon or alibaba etc.
alternatively you can also try building one with my guidance, it wouldn't be too expensive so there's nothing to worry even if you fail to succeed…
Bhardwaj Rajyaguru says
Hello Sir, I want to Make SPWM using p89v51rd2 microcontroller…
I need your help for making circuit of ir2110.
so please…
Swagatam says
Rajya, I am not good at coding MCUs, so I won't be able to help you with this project….
but I can help you with IR2110 circuit
Anonymous says
Hi Sir, What is the purpose of the 1uF & 1N4007? How it work?
Swagatam says
Hi, it's for bootstrapping, which makes sure that the high side mosfet always gets a gate voltage that's equal to the drain supply + IC supply voltage(Vdd)
Paul Kabete says
hi sir i really appreciate your great efforts and am in a process of making a vfd driver circuit using this 2110 and with an arduino ….. so can u please give me a hint on this!.
Swagatam says
Hi Paul, please specify what info exactly you are looking for??
R-J says
Hi Sir
.I have a question, what Mosfets used in this project?? thanks.
Swagatam says
Hi gh RJ,
you can use IRF540
Muhammad Ayaz says
i need help in this project
Anonymous says
Hi Sir,
Is this circuit applicable for AC motor? Thanks.
Swagatam says
yes it's applicable only for AC motors
sacchu says
hi sir
all component in this circuit plz help me my e mail :-mee_meecontrol@yahoo.com