Small signal analysis of dual input buck converter

Author(s): M M Alam, D C Lu,Y Siwakoti
School of Electrical and Data Engineering, University of Technology Sydney, Australia
International Journal of Smart Grid and Clean Energy, vol. 9, no. 1, January 2020: pp. 8-16
ISSN: 2315-4462 (Print)
ISSN: 2373-3594 (Online)
Digital Object Identifier: 10.12720/sgce.9.1.8-16

Abstract: This paper presents a small signal modelling and voltage-mode control of a pulse-width modulated (PWM) dual-input DC-DC buck converter. The control of multiple switches in a power converter is the main challenge for multiple-input converters addressed in this paper. Using the concept of linearization and perturbation depicted in circuit averaging technique, the closed-loop small signal model for multi-input DC-DC buck converter is derived. The closed loop control to output voltage transfer function is derived. A brief compensator design is introduced for a multi-input buck converter. In order to control the duty cycles of multiple switches and control the output voltage, a new variable is introduced to relate the duty cycles in the closed loop control to output voltage transfer function. The analysis and controller design are simulated in LTSpice.

Keywords: Small Signal Model, Pulse Width Modulation (PWM), DC/DC Buck Converter
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