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PROJECT DESCRIPTION

This project is aimed to produce a variable AC supply in order to control the speed of a single- phase induction motor by producing PWM modulated sinusoidal voltage using  microcontroller. This is implemented to replace the commonly used phase-angle control by TRIACs that generate lot of harmonics.

The proposed system uses a microcontroller of the 8051 family and a rectified-power supply. In this system, the load is controlled by an IGBT switch, which is duly interfaced to the microcontroller. AnOpto-isolator is used for merging the isolating device.  An op-amp acts as a zero-crossing detector, which is connected to the microcontroller to give a reference input.  A push-button switch is interfaced to the microcontroller for varying the duty cycle of PWM pulses.

The microcontroller develops respective PWM pulses based on the zero crossing detector, which is fed to the IGBT switch through the Opto-isolator.  The current can flow through the bridge rectifier to the IGBT and then to the load. The duty cycles (PWM) are varied by the push-button switch and  turns the load respectively. Thus,  by changing the duty cycle of the PWM pulses, the power to the load is controlled.

PROJECT HIGHLIGHTS
Call/mail for Tech Support from 10 am - 7 pm IST.
Easy to use, Self-explanatory kit.
All-inclusive solution kit.
Extensive audio-visuals available.
Branding-free material.
Pre-programmed Microcontroller.
BLOCK DIAGRAM
Hardware Requirements
  • 8051 series Microcontroller
  • LM358
  • Opto- isolators
  • IGBT
  • Push Button
  • Transformer
  • Diodes,Voltage Regulator
  • Resistors
  • Capacitors
  • Zener
  • Crystal
  • Lamp
Software Requirements
  • Keil compiler
  • Languages: Embedded C or Assembly
PROJECT RESOURCES
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 ACPWM control?
A:  It presents a design of a low-cost, high-efficiency drive capable of supplying a single-phase AC induction motor with a PWM modulated sinusoidal voltage by chopping the AC wave form.
Q:  Can I place motor instead of lamp?
A:  Yes up to ¼HP, 230V AC motor can be placed
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