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US 10,122,165 B2Granted
Apparatus and method for reducing harmonics
AssigneeDanfoss Power Electronics A/S
InventorFiruz Zare
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AssigneeDanfoss Power Electronics A/S
InventorFiruz Zare
Estimating the term…
The present invention provides systems and methods for reducing harmonics, for example when using an AC to AC converter to drive a load such as a motor drive. In a first embodiment, a plurality of load driving circuits is provided, each drawing current from a 3-phase AC supply and driving an AC load, wherein each of said load driving circuit includes a 3-phase rectifier, with the rectifiers of the load driving circuits being controlled such that the rectification of the AC supply by the load driving circuits is staggered. In a second embodiment, a load driving circuit comprises an electronic inductor configured to control the DC link voltage and/or current such that the current drawn from the AC supply by the load driving circuit has a stepped profile. The first and second embodiments may be combined.
A load driving circuit comprising:
A system comprising a plurality of load driving circuits, each of the load driving circuits drawing current from a 3-phase AC supply and driving an AC load, wherein each of said load driving circuit comprises:
A method comprising controlling an electronic inductor provided between a 3-phase rectifier and a DC link stage of a load driving circuit such that the output voltage and/or output current of the DC link stage is controlled such that the current drawn from a 3-phase AC supply by the load driving circuit has a stepped profile,
A method comprising controlling rectifiers of a plurality of load driving circuits arranged in parallel such that the rectification of at least some of the load driving circuits are staggered, wherein each of said load driving circuits comprises:
Dependencies are inferred from the claim text.