Abstract—DC-DC converters with high step up gain are acquiring much significance with increase in renewable energy applications. Among them cascade boost derived converters with single active switch are of more interest. In the cascade boost family, quadratic boost converter is the best trade-off when circuit complexity and modulator saturation is considered. Hence, a robust controller design to obtain output voltage regulation in a quadratic boost converter with high dc gain is proposed in this paper. The proposed controller has an outer loop Proportional-Integral (PI) compensator in an outer loop that operates over the output voltage error and sets the current reference value of the sliding surface. The inner loop is based on sliding mode control whose sliding surface is defined for the input inductor current. The analysis of the proposed control loop is performed by means of the equivalent control method and robustness is analysed in depth taking into account the parameter variation related with the operation of the converter in different equilibrium points. Simulations results are presented to validate the approach for a (20-100) W quadratic boost converter stepping-up a low dc voltage (15-25)V DC to a 400V DC level.

 

Index Terms—quadratic boost converter, robust loop shaping, and sliding-mode control

Cite: S. V. Pavan Kumar Maddukuri and Yuri B. Stessel, "Robust Sliding Mode Control Design for a Quadratic Boost Converter," International Journal of Electronics and Electrical Engineering, Vol. 4, No. 5, pp. 386-391, October 2016. doi: 10.18178/ijeee.4.5.386-391