Online System Identification of DC-DC Converter for RFPA

Ahmed Lashin, Ahmed Mahfouz


This paper describes non-parametric system identification of a DC-DC converter based on spectral analysis correlation method. The used technique identifies the open-loop characteristics of a DC-DC converter online while the unit operates in closed-loop. A digital controller is used to perform both the closed-loop control of the converter and to periodically identify the converter by injecting a pseudo-random binary perturbation. Experimental results are provided for an example buck-boost converter to demonstrate accurate identification of the converter control-to-output frequency response. Experimental results have revealed stable operation of the converter during identification while meeting severe transient response requirements. This technique is advantageous for developing wide-input range/wide-output range converters which are vital for RF power amplifiers used in space and telecommunication applications.

Keywords: System Identification, Adaptive Control, DC-DC converter, RFPA

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ISSN (Paper)2224-3232 ISSN (Online)2225-0573

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