Premalatha KALİANNAN, Nandhini JYOTH, Kavitha RANGASAMY

Modeling and Analysis of Positive Output Luo Converter in Voltage Control Mode

This paper presents the modeling, controller design, and stability analysis for positive output LUO converter (POLC) in voltage control mode. The POLCuses elementary voltage lift technique to regulate the output voltage from a variable input voltage. In modeling of POLC, the transfer functions forcontrol input to output and disturbance input to output are derived using linearized state-space averaging technique. The developed transfer functionof POLC is analyzed for various duty cycles and circuit parameters. To improve the dynamic performance of POLC, the integral lead controller and theintegral lag-lead controller are designed. This paper also presents the maximum time delay computation of POLC without losing small signal stability.Rekasius’s substitution was used to analyze the stability with time delay. The performance of both the controllers was analyzed for various input voltages,reference voltages, and loads in MATLAB Simulink environment. The integral lag-lead controller provided an improved transient response and betterstability. To validate the performance of the controllers, prototype experimental setup was implemented. The performance of the integral lag-leadcontroller was better despite the time delay caused by feedback element.

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