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Sinusoidal PWM has been a very popular technique used in AC motor control. This is a method that employs a triangular carrier wave modulated by a sine wave and the points of intersection determine the switching points of the power devices in the inverter.

Though this method is unable to make full use of the inverter’s supply voltage and the asymmetrical nature of the PWM switching characteristics produces relatively high harmonic distortion in the supply it is still popular for its simplicity.

This abstract describes the theory of SPWM and the project shall be made using a programmed microcontroller of 8051 family duly interfaced to 3 phase inverter with 6 no’s MOSFET from DC derived from a single phase or 3 phase ,50 Hz supply. The load shall be a three phase 50Hz motor, 440volt, 0.5 to 1 HP motor.

Alternatively a star lamp load can be used to view the waveform only. This project uses an 8051 family microcontroller duly interfaced to the opto-isolators for feeding to the bridge drivers. 3 no’s of dual bridge drivers are used to feed 3 phase bridge inverter with the DC supply developed from single phase AC after rectification.

Powering the circuit is achieved by a pair of control transformers with bridge rectifier and filter capacitors. One set of this power is used for the microcontroller and the other one is used for driving circuits of the three phase bridge.

Further this project can be enhanced by following Space Vector Pulse Width Modulation Technique for higher efficiency and low harmonic distortion for motors.

NOTE: A 3 phase induction motor of 0.5HP or 1HP is required to see the output. Motor is not supplied along with the kit. However, it can be purchased at extra cost.

Easy to use, Self-explanatory kit.
All-inclusive solution kit.
Extensive audio-visuals available.
Branding-free material.
Pre-programmed Microcontroller.
Single to Three Phase Converter.
Call/mail for Tech Support from 10 am - 7 pm.
Can be Customized for Arduino, Raspberry Pi, PIC
Sine Pulse Width Modulation (SPWM)
Hardware Requirements
  • 8051 series Microcontroller
  • Gate Driver
  • Crystal Oscillator
  • Toggle Switches
  • Resistors
  • Capacitors
  • Diodes
  • Transformer
  • Regulator
  • Opto-isolators
Software Requirements
  • Keil compiler
  • Languages:Embedded C or Assembly
Q & A
Q:  Which microcontroller is used in this project?
A:  A 40 pin microcontroller from 8051 family is used in this project.
Q:  What is SPPWM?
A:  SPWM or sine pulse width modulation is a type of pulse modulation wherein the triangular carrier signal is compared with the sinusoidal reference signal to generate the pulse modulated signals.
Q:  What is the rating of motor to be used in this project?
A:  3 phase, ¼HP is the motor rating used.
Q:  What is the function of MOSFET in this project? Can we use BJT instead of MOSFET?
A:  Here, MOSFET is used as a switch. BJT can be used, but that needs drive current and not voltage as required for MOSFET.
Average Rating
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Showing 3 of 3 reviews
VISHAL MISHRA, AHMEDABAD on 21st July, 2016, 06:25 PM

I have searched with key word as engineering projects in google
By seeing the outline of the project details and components provided
I have Received the components in right time
helped in purchasing online and made online payment
To be more materialistic

Rilav Patel, Visnagar on 13th June, 2015, 04:16 PM

I used “Engineering latest projects” on Google. I found your website on internet.I like the quality of components and project details in CD.I got the kit on time.I directly purchased the project through online.No suggestions.

Raja Rao, on 9th November, 2012, 11:38 PM

I have taken this project to do it along with my friend. The hardware components are very new and they did not create any problems. We have already developed this project and submitted in our college successfully.

Rating Breakdown (3 Reviews)

Edgefx Technologies Pvt. Ltd.,
Plot No. 105, 3rd Floor,
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Telangana, India
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