THREE-PHASE REVERSIBLE SIGN-CHANGING FREQUENCY CONVERTER DRIVEN BY NETWORK Russian patent published in 2012 - IPC H02M5/16 

FIELD: electricity.

SUBSTANCE: invention relates to devices for conversion of frequency driven by a network and may be used in plants, where frequency control is required. Two semiconductor units of a three-phase bridge module are made from semiconductor elements, besides, semiconductor elements of one semiconductor unit are combined and connected to the start of the load, and semiconductor elements of the other semiconductor unit are combined and connected to the end of the load. Semiconductor elements of one semiconductor unit and semiconductor elements of the other semiconductor unit are connected in pairs, and these pairs are connected to appropriate phases of a three-phase source of AC voltage. Semiconductor elements are transistors, which send current in a key mode from the emitter to the collector and from the collector to the emitter. Collectors of transistors of one semiconductor unit of the three-phase bridge module are combined and connected to the start of the load, and collectors of transistors of the other semiconductor unit of the three-phase bridge module are combined and connected to the end of the load. Emitters of transistor of one and other semiconductor units of the three-phase bridge module are combined in pairs and are connected to appropriate phases of the three-phase source of AC voltage.

EFFECT: generation of sign-changing voltage of different frequency on a load.

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