<p>Due to increase in electric energy demand, energy extraction from solar and wind are much concentrated in power electronic systems. There is a wide variation in the output of solar array and it needs efficient DC-DC converter. This paper discusses about the design and implementation of closed loop control of Quadratic buck boost converter for the variable DC input voltage whose voltage ratio is -D2/(1-D)2.This converter uses a single switch to control output voltage unlike cascaded buck and buck boost converters. Cascaded conventional converter uses two switches for the same voltage ratio of -D2/(1-D)2. They also suffer from duty cycle and switching frequency limitations during wide input voltage variations. These problems can be reduced with the help of quadratic converter. In this paper quadratic closed loop control of buck boost converter is proposed for the variable solar panel output. Simulation of the circuit is done using MATLAB simulink and hardware implementation results are discussed. © Research India Publications.</p>
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R. Mahalakshmi, Manjunath, H. V., and Thampatty, K. C. S., “Design and implementation of quadratic buck-boost converter for PV array”, International Journal of Applied Engineering Research, vol. 10, pp. 1023-1034, 2015.