CONTROLLING
AC POWER BY PROGRAMMING
ABSTRACT
The main goal of this
project is to control AC power based on the principle of firing angle control
of thyristors. A display unit displays the full power or any percentage that
one can enter to reduce thepower to the load. Firing angle is automatically
adjusted to maintain the load power. The project usesalamp such that the
entered power matches the required one by its intensity. The above operation is
carried out by using a TRIAC in series with the ACload. (Optionallytwo no's of
SCRs connected back to back can also be used)
It uses a microcontroller of
the 8051 family. Input is given to microcontroller using a keypad and ZVS is
given as reference. A 16X2 LCD is used for display purpose.
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. Then 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 microcontroller
and other components.
BLOCK DIAGRAM
Photos just for reference:
video for reference of working of project:
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