Puspendu Maji, G K. Panda, P K. Saha
The switch mode power supply (SMPS) has been achieved the high power density and high performance by developing the power semiconductor devices such as IGBT, BJT, MOSFET, and GTO etc. SMPS has the capacity to handle the variable loads and variable input voltage. The efficiency, weight and size of power supplies are a great area of concern for the power supply designers. This article introduces the method of intelligent regulation to control the Buck converter using the pulse width modulation switching by a fuzzy logic and robust controller. In this paper we use the buck circuit having power MOSFET as a switch and fuzzy logic and robust controller based PWM gate signals to the switch for controlling purpose. This paper describes the design of a fuzzy logic controller using output voltage of the converter as feedback for significantly improving the dynamic performance of buck dc-dc converter by using MATLAB/ SIMULINK. In the case of robust controller, the Buck converter output voltage remains constant irrespective of load and input voltage variations from 140V to 340V.
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