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Abstract
Over the last few years, power factor correction has become an important field of research, due mainly to changing low frequency EMC standards. Our interest lies in AC/DC conversion from 230 V line voltage. Since July 1 1995 and for this type of line, European standard EN 61000-3-2 has replaced EN 60555–2, which entails great change for low and medium power converters.
Usually, the stage between the network and a DC/DC converter is composed of an uncontrolled diode rectifier followed by a structure comprising at least an inductor and a capacitor. First, the capacitor sets the voltage variation in primary DC voltage and the inductor induces the input current waveform. However, these characteristics are not controlled by the typical rectifier and depend on network conditions or on load variations. This low-cost robust system is analysed respecting EN 60555–2 and EN 61000-3-2 criteria. The relation between total harmonic distortion and the power factor is shown.
In order to improve the behaviour of this stage, an active component has been added to the existing passive components when redesigning the chopper. This chopper is controlled in “Power Factor Correction” mode i.e. input current is triggered to a sinusoidal current from a loop. Depending on the choice of chopper, one or several high frequency passive components are needed but a low frequency filter (capacitance on output) is still required.
The paper goes on to study the use of the boost chopper as a preregulator in association with another converter, and then the use of the insulated flyback converter to supply DC output voltage. For both, the different PFC control modes which enable a sinusoidal line current to be obtained are analysed and discussed for discontinuous and continuous conduction modes.
Additional information
Notes on contributors
Ch. Andrieu
Jean-Paul Ferricux received the doctorate degree in electrical engineering from the Institut National in Polytechnique de Grenoble – FRANCE, in 1984. Professor at the Institut Universitaire de Technologie I de Grenoble and research officer in the Laboratoire d’Electrotechnique de Grenoble (LEG). His major field of interest is power electronics (static convener and resonant converter, modelling and control). Heis co-author of a power electronics book entitled “Switch-mode power supplies, resonant converters.”
J-.P. Ferrieux
Christophe Andrieu received engineering degree and the doctorate degree in electrical engineering from the Institut National polyteehnique de Grenoble – FRANCE. in 1991 and 1995.
His major field of interest is power electronics (switch-mode power supply. power factor correction).(LEG-ENSIEG – BP 46 – 38402 Saint Martin d’Heres Cedex-FRANCE)
M. Rocher
Michel Rocher is Projects Group Manager with Alcatel Converters, expert in energy conversion for telecommunications applications.
His major field of interest is power electronics (Power Supply-Converters-Inverters-Battery Charger-Power Factor COrrection-Simulations-Modelling). (ALCATEL Converters. 4, rue de Broglie. BP 19, 22301 LANNION Cedes – FRANCE)