A robust cascaded controller for DC-DC Boost and Cuk converters

This paper proposes a robust cascaded controller based on Proportional-Integral (PI) and Continuous Sliding Mode Control (CSMC). Design/Methodology/Approach: Cascaded control structure is an attractive control scheme for DC/DC power converters. It has a two loop structure where the outer loop contains PI controller and the inner loop employs SMC. This structure thus combines the merits of both the control schemes. However, there are some issues that have prohibited its adoption in industry-the discontinuous nature of SMC which leads to variable switching frequency operation and is hard to realize practically. This paper attempts to overcome this issue by changing the discontinuous functionality of SMC to continuous by utilizing the concept of equivalent control