The project is based on the principle of firing angle delay of thyristors using back to back SCR’s with control being fed from a microcontroller via opto isolators. The firing angle would be adjusted to maintain the load power by an up and down switch. The above operation can also be carried out by using a TRIAC in series with the load.
The project is having comparator which is used for ZVR output. The ZVR is given as reference interrupt to microcontroller. The microcontroller is of 8051 family which is of 8bit. In this we are using switch which is used for increasing the firing angle. The opto-isolator used in the project is used as switching element using this we will trigger the back to back SCR. On the base of SCR triggering the intensity of the AC lamp can be controlled.
The power supply consists of a step down transformer 230/12V, which steps down the voltage to 12V AC. This is converted to DC using a Bridge rectifier. The ripples are removed using a capacitive filter and it is then regulated to +5V using a voltage regulator 7805 which is required for the operation of the microcontroller and other components.
For more details about this project, please visit http://www.efxkits.com/project-kit/electrical/1115.html
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