Cascaded multilevel inverter
AssigneeKing Saud University
InventorsAbdullah Mohammed Ali Noman, Abdulaziz Abdullah Alkuhayli
Life of this patent
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Abstract
The cascaded multilevel inverter utilizes a delta polyphase circuit and transformers in each leg using cross-phase connection windings. Transformers corresponding to a number of phases of the inverter use an in-phase connection winding and a cross-phase connection winding to respective other legs, so that the respective transformers having the in-phase connection windings are connected in series with a DC power supply.
Claims14
A cascaded multilevel inverter, comprising a delta-connected polyphase circuit having:
- a plurality of transformers corresponding to a number of phases of the multilevel inverter;
- a plurality of legs corresponding to the number of phases of the multilevel inverter, each leg including one of the transformers, the respective transformers each having an in-phase connection winding connected in series with a DC power supply and a cross-phase connection winding, the cross-phase connection winding being connected to respective ones of the other legs;
- and
- the plurality of transformers having their cross-phase connection windings connected to different phase legs with different ones of the transformers having their cross-phase connection windings connected on opposite sides of the in-phase connection windings within the leg connected to the cross-phase connection winding, the legs and transformer connections being configured in multiples of three.
A method of inverting DC current to provide a polyphase AC output, comprising the steps of:
- connecting a plurality of legs, at end connections, and cross-connecting the legs with at least one transformer per leg, cross-connected to at least two other legs of the plurality of legs, each of the at least one transformers having an in-phase connection winding and a cross-phase connection winding to respective other legs of the plurality of legs;
- for each of the legs, connecting a DC power supply in series with the respective leg, so that each of the legs includes one of the at least one transformers, the respective transformers having the in-phase connection windings connected in series with a DC power supply;
- and
- configuring the legs and transformer connections in multiples of three.
Dependencies are inferred from the claim text.