ABSTRACT
Fuzzy logic is an outcome of merging the techniques of traditional rule based expert system, set theory and control theory, which is essentially based on mathematical models of the controlled process.
The concept of this paper is to control the illumination of a light source by using the fuzzy logic.
Here the error and error rate are input parameters and the voltage is the output. Theses are all normalized in the form of intersecting triangular membership functions with seven linguals each. The rules are formed by the knowledge.
At a time four rules are fired, and the maximum of their output is taken. The value is defuzzified by the method named center of the area or center of gravity.
The defuzzified voltage is denormalised and made as a pulse to be given to a power control circuit using phase control method.
The pulse produced proportionally to give the power to the circuit, the illumination is again sensed and given to the controlling unit
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