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Dynamic model development and control for multiple‐output flyback converters in DCM and CCM
Author(s) -
Delavaripour Hossein,
Mirzaeian Dehkordi Behzad,
Adib Ehsan,
Abootorabi Zarchi Hossein
Publication year - 2018
Publication title -
international journal of circuit theory and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.364
H-Index - 52
eISSN - 1097-007X
pISSN - 0098-9886
DOI - 10.1002/cta.2467
Subject(s) - converters , flyback transformer , control theory (sociology) , inductor , waveform , flyback converter , small signal model , voltage , power (physics) , buck–boost converter , buck converter , computer science , boost converter , electronic engineering , engineering , electrical engineering , physics , control (management) , transformer , quantum mechanics , artificial intelligence
Summary Multiple‐output flyback converters are widely used in switching power supplies due to their low component count and cost‐effective structure. The main problem of this structure is how to balance output voltages in different load conditions. This paper proposes a new approach for single‐input multiple‐output flyback converters operating in DCM and CCM by a small‐signal averaged model. The averaged model is derived by presenting the piecewise‐linear waveform for the inductor currents inside the converter. In DCM, the magnetizing current and currents through the output windings reach zero when the switch is turned off. In CCM, the magnetizing current of the converter is continuous over a switching interval and this possibility exists that only some of the output diodes completely conduct when the switch is off. The proposed model of the converter can be used in a wide range of operations within identical and non‐identical loading conditions. Using a laboratory prototype, several case studies and input‐to‐output transfer functions are considered to verify the proposed model. The controller design is performed for the both CCM and DCM, and then dynamic characteristics of the overall system are evaluated.