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PROJECT DESCRIPTION

The project is designed to achieve integral cycle switching, a method to remove whole cycle, cycles or portions of cycles of an AC signal. It is a well-known and old method of controlling AC power, especially across linear loads such as heaters used in electric furnace. However, this concept is also known as  cycle stealing of voltage waveform.

By using microcontroller it can be very precise as per the program written in assembly/ C language so that the actual time-average voltage or current experienced at the load would be proportionately lower than the whole signal if applied to the load.

In place of linear load output, a series motor or lamp can be used to verify the output. One side effect of utilizing this scheme is an imbalance in the input current or voltage waveform as cycles are switched on and off across theload.

In this project, we are using comparator for zero crossing detection which is fed as an interrupt to the microcontrollerof the8051 family. The microcontroller deliversoutput based on the interrupt received as reference for generating triggering pulses.

Using these pulses, we drive opto-isolator for triggering a TRIACto achieve integral cycle control as per the input switches interfaced to themicrocontroller. A lamp is provided in this project in place of a motor for demonstration purpose only.

Furthermore, this project can be enhanced by using a feedback mechanism to automatically maintain the desiredoutput to the load by appropriate cycle stealing.

 

 

 

 

PROJECT HIGHLIGHTS
Easy to use, Self-explanatory kit.
All-inclusive solution kit.
Extensive audio-visuals available.
Branding-free material.
Pre-programmed Microcontroller.
Call/mail for Tech Support from 10 am - 7 pm.
Can be Customized for Arduino, Raspberry Pi, PIC
BLOCK DIAGRAM
Integral Cycle Switching (Cycle Stealing) means of Power Control without Generating Harmonics
Hardware Requirements
  • 8051 series Microcontroller
  • Op-amp
  • Opto-isolator
  • TRIAC
  • Resistors
  • Capacitors
  • Diodes
  • Voltage Regulator
  • LED
  • Crystal
  • LCD
  • Lamp
Software Requirements
  • Keil compiler
  • Language: 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:  Can I use a motor instead of the lamp?
A:  Yes, an AC motor with rating- ΒΌ HP, 230V can be used.
Q:  Which thyristor is used?
A:  TRIAC BT136 is used as the thyristor.
Q:  What is cycle stealing?
A:  Cycle stealing is a technique to control power to a load by removing the portion of cycle or cycles from the AC supply
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