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PROJECT DESCRIPTION

This project is designed for a three-phase-solid-state relay system. It incorporates three single-phase units wherein each phase is controlled individually by power TRIAC with RC snubber network for a zero-voltage switching (ZVS).

Opto-isolators are used in each phase to receive switching signals from a microcontroller of the 8051 family. Loads are connected in series with a set of TRIACS driven by an opto-isolator. The microcontroller is designed to generate output pulses after zero voltage pulse to ensure that the load  gets switched on at zero cross of the supply waveform.

The zero crossing feature of the TRIAC driver, (an opto-isolator) ensures low noise generation thus avoiding sudden inrush of current on resistive and inductive loads. In this project, two push buttons are used for generating the output pulses from the microcontroller randomly, away from the ZVS ie not coinciding with zero voltage supply voltage of the waveform.

Thus the lamp which is used as a load is forced to switch on and off at non ZVS points but the final switch happens at the next ZVS only. Using CRO or DSO we can see the waveform of voltage supplied to load for verifying the switching on ,of the load at zero voltage point.

Furthermore, this project can be enhanced 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
Easy to use, Self-explanatory kit.
All-inclusive solution kit.
Extensive audio-visuals available.
Branding-free material.
Pre-programmed Microcontroller.
Load Switch @ Zero Voltage.
Call/mail for Tech Support from 10 am - 7 pm.
Can be Customized for Arduino, Raspberry Pi, PIC
BLOCK DIAGRAM
Semiconductor Relay with ZVS
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:  The microcontroller used in this project is a 40 pin IC from 8051 family.
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.
Q:  What is the formula for calculating smoothing capacitor value?
A:  There is some approximated formula .Peak to peak ripple voltage = Load current in amps / (2*line frequency in hertz *capacitance in farads). But as rule of thumb for 1 A current 1000uF is best. Thus it is load dependent.
Q:  What to do when the lamp fails and what is the maximum lamp rating that can be used?
A:  If the lamp fails one can use any lamp or bulb which is used in homes up to 100W. We suggest you to go for low watt bulbs.
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Telangana, India
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