Research articleAnalysis, control and design of a non-inverting buck-boost converter: A bump-less two-level T-S fuzzy PI control

- This paper introduces a new modified Fuzzy Two-Level Control Scheme (TLCS).
- The proposed framework is simple and does not have any complexities.
- Simulation and experimental results based on a TMS320F28335 DSP are conducted on a non-inverting buck-boost converter.
- The proposed method could efficiently improve the performance of the converter in both buck and boost modes.

In this paper, a new modified fuzzy Two-Level Control Scheme (TLCS) is proposed to control a non-inverting buck-boost converter. Each level of fuzzy TLCS consists of a tuned fuzzy PI controller. In addition, a Takagi-Sugeno-Kang (TSK) fuzzy switch proposed to transfer the fuzzy PI controllers to each other in the control system. The major difficulty in designing fuzzy TLCS which degrades its performance is emerging unwanted drastic oscillations in the converter output voltage during replacing the controllers. Thereby, the fuzzy PI controllers in each level of TLCS structure are modified to eliminate these oscillations and improve the system performance. Some simulations and digital signal processor based experiments are conducted on a non-inverting buck-boost converter to support the effectiveness of the proposed TLCS in controlling the converter output voltage.