Circuit for power factor correction

H - Electricity – 02 – M

Patent

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Details

H02M 1/42 (2007.01) H05B 41/28 (2006.01)

Patent

CA 2479981

The invention relates to a circuit (1) used for power factor correction, which corresponds to a known circuit that comprises a high-frequency frequency source (15) for generating a high-frequency voltage (Uf) for a pump capacitor (14). The high-frequency voltage source (15) according to the invention comprises two on/off switches (151, 152) connected in series that generate, at an electric connection point (153), a square wave voltage (U1) that varies between these two switches with a frequency (f) of at least 1 megahertz. The voltage source further comprises a smoothing device (150) for generating from the square wave voltage a smoothed voltage (Uf) for the pump capacitor, whereby said smoothed voltage varies with a frequency (f) of at least 1 megahertz.

L'invention concerne un circuit (1) destiné à corriger le facteur de puissance électrique, ce circuit comprenant, comme les circuits classiques de ce type, une source de tension HF (15) servant à produire une tension électrique haute fréquence (Uf) pour une capacité de pompage (14). Selon l'invention, cette source de tension HF (15) comprend deux commutateurs marche/arrêt (151, 152) montés en série qui génèrent au niveau d'un point de connexion électrique (153) situé entre ces deux commutateurs une tension rectangulaire (U1) variant avec une fréquence (f) d'au moins 1 MHz. Cette source de tension HF (15) comprend par ailleurs un dispositif de lissage (150) pour générer à partir de la tension rectangulaire une tension électrique lissée (Uf) pour la capacité de pompage, cette tension lissée variant avec la fréquence (f) d'au moins 1 MHz.

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