POWER-FACTOR IMPROVEMENT CIRCUIT SUPPRESSING LOSS AT LIGHT LOAD AND DRIVING METHOD THEREFOR

PROBLEM TO BE SOLVED: To provide a power-factor improvement circuit with a plurality of main switching elements, capable of suppressing power loss by changing the number of the main switching elements driven correspondingly to a load.SOLUTION: The power-factor improvement circuit, which improves a p...

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Hauptverfasser:	AOKI ISAMU, WATANABE KAZUOMI, ISHIKAWA KAZUYUKI, HAMADA TAKAYUKI, YAMASHITA SHIGEJI
Format:	Patent
Sprache:	eng
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 CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS GENERATION TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a power-factor improvement circuit with a plurality of main switching elements, capable of suppressing power loss by changing the number of the main switching elements driven correspondingly to a load.SOLUTION: The power-factor improvement circuit, which improves a power factor of DC power input from a rectification circuit, includes a plurality of main switching elements connected in parallel to an input from the rectification circuit. A part of the plurality of main switching elements are made to serve as power-factor improvement circuits for stopping driving according to a high/low load. The rectification circuit is a full-wave rectifier circuit that converts an AC commercial power supply into a DC power supply or a semi-bridgeless circuit that converts an AC commercial power supply into a DC power supply.