A Hybrid Control Algorithm for Voltage Regulation in DC-DC Boost Converter

• Published in: IEEE transactions on industrial electronics (1982) Vol. 55; no. 6; pp. 2530 - 2538
• Main Authors: Sreekumar, C., Agarwal, V.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.06.2008; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Approximation algorithms; Control algorithms; Control system synthesis; DC-DC power converters; Flowcharts; Hybrid control; Laboratories; limit cycle; Limit-cycles; MATLAB; modeling; Performance analysis; power converters; stability; state feedback; Studies; Switching converters; switching systems; Voltage control; Power converters; hybrid control; limit cycle; state feedback; Modeling; stability; switching systems
• ISSN: 0278-0046; 1557-9948
• DOI: 10.1109/TIE.2008.918640

A new switching control algorithm based on state trajectory approximation is proposed to regulate the output voltage of a representative second-order DC-DC converter - the boost converter. The essence of the proposed algorithm is to trap the system into a stable limit cycle while ensuring the required voltage regulation. Unlike some of the earlier algorithms, the concept is applicable to both continuous and discontinuous current modes of operation, making it viable over a wide operating range under various load and line disturbances. A hybrid-automaton representation of the converter is used to perform the analysis, and the control problem is simplified to a guard-selection problem. Guard conditions, governing the transition of the converter operation from one discrete state to the other in a hybrid-automaton representation, are derived. The hybrid-automaton-based control system is implemented by using the state flow chart feature of MATLAB, and extensive simulations are carried out to check the suitability of the algorithm. The hybrid control law is also validated in real time by using a laboratory prototype. The experimental and simulation results prove the effectiveness of the proposed control law under varying line and load conditions.