Controller for an AC/DC converter having a switchable PFC, and a method of controlling an AC/DC converter

A method of controlling an AC/DC to converter is disclosed, the converter having a power factor correction stage and a signal (205) indicative of a required power and operating with a switching cycle having a switching frequency being the inverse of a switching period. The method comprises switching...

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Bibliographische Detailangaben
Hauptverfasser:	MERCIER, FREDERIC, DELCOURT, CHRISTOPHE, ALTHEIMER, MICHEL
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION
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Beschreibung
Zusammenfassung:	A method of controlling an AC/DC to converter is disclosed, the converter having a power factor correction stage and a signal (205) indicative of a required power and operating with a switching cycle having a switching frequency being the inverse of a switching period. The method comprises switching on the PFC stage, in response to a signal (215) indicative of an average switching frequency rising above a first threshold. The method further comprises switching off the PFC stage, in response to the signal indicative of an average switching frequency failing below a second threshold. The method may further comprise switching on the PFC stage, in response to a positive step change in the signal indicative of a required power, and switching off the PFC stage, in response to indicative step change in the signal indicative of a required power. A controller and an AC/DC converter operable according to such a method are also disclosed as is an LED lighting system comprising such a controller.