Inderscience Publishers

Modelling, design and control of a SEPIC power factor corrector for single–phase rectifiers: experimental validation

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In this paper, a new general case switching–function–based model is proposed for a DC–to–DC single ended primary inductance converter (SEPIC). Compared to conventional buck or boost converters, this topology allows a low current ripple at the input for a relatively low level of the DC–bus voltage. The converter is used as a power factor correction (PFC) circuit for a single–phase rectifier and, based on the obtained model, steady–state analysis is performed and new design criteria were established for a proper selection of the inductors and capacitors. In order to verify the performance of the converter in PFC applications, a simple hysteretic–based feedback control is implemented and verified through simulations. For validation purpose, experiments are carried out on a 1kW laboratory prototype of the converter. The system performance is evaluated in terms of source current total harmonic distortion (THD), voltage regulation, robustness and dynamic behaviour.

Keywords: single ended primary inductance converter, SEPIC, switching function modelling, power factor correction, PFC, single–phase rectifiers, feedback control, experimental validation, hysteresis, source current THD, total harmonic distortion, voltage regulation

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