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PROJECT DESCRIPTION

The main intention of this project is to design a system with a three-phase solid-state relay. It consists of three single phase units, and every phase is individually controlled by a power TRIAC along with a RC snubber network for zero-voltage switching.

The proposed system uses a microcontroller of the 8051 family and a rectified power supply. Loads are connected in series with a set of TRIAC being driven by an opto-isolator. In this project, two push buttons are used for generating output pulses from the microcontroller, randomly.

The AC power is made to switch on by varying the duty cycles (PWM Pulses) from the microcontroller as per the program. The microcontroller receives the percentage of duty cycles randomly from the push buttons and delivers the desired output to the switch TRIAC for the electrical loads. The O/P wave form needs to be seen on the CRO / DSO across the load (using isolation transformer) to confirm the switching happening always at the start of the voltage wave form.

This project in future can be implemented by using 2 back-to-back SCRs, in each phase, for heavy load switching, as used in industries. Over load and short circuit protection can also be incorporated for higher reliability.

PROJECT HIGHLIGHTS
Load Switch @ Zero Voltage.
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
  • Opto-isolator
  • Triacs
  • Transformers
  • Diodes
  • voltage regulator
  • push button
  • LED
  • Resistors
  • Capacitors
  • Crystal
  • Lamp
Software Requirements
  • Keil compiler
  • Languages: Embedded C or Assembly
Q & A
Q:  Which microcontroller is used in this project?
A:  8051 family 40 pin microcontroller is used in this project.
Q:  What is the concept of this project?
A:  The concept is to switch on the load at zero crossing point using opto coupler and thyristor. The signals can be observed on any Digital Storage Oscilloscope.
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