Fuzzy Logic Based Temperature Controller

Abstract

Navigation systems are designed to provide precise position details to the user. For getting high accuracy in terms of position, precise timing systems are required. These timing systems require to be thermally stable within sub degree centigrade. There are various controllers available in literature to provide precise temperature control like, PID controller and its variants ( P, I, D and their combinations) and Fuzzy controller. There are no overshoots in the response of Fuzzy controller whereas in response of PID controller, they are present[2] [12]. In precise timing systems, overshoots are not al- lowed so, Fuzzy controllers are batter to control their temperature. Fuzzy controller gives better performance because they are independent of plant model and plant environment and they are controlled by set of rules. Fuzzy systems are adaptive in nature, manual tuning is not require. Digital implementation serves better to achieve thermal stability. Nowadays, FPGAs are most perfect devices as compare to DSP Processors and Micro-controllers because of its faster computation, high density and low power consumption. The project deals with design of Fuzzy Logic based Temperature Controller which have been implemented on Actel-FPGA to achive precision within sub degree centigrade which consist a closed loop system. This close loop system contains signal conditioning circuit, FPGA, drive electronics and sensors to achieve desired set- point . Simulations have been carried out in MATLAB/Simulink-R2013b. Results shows that, there are no overshoots in close loop system response.