Method and device of electrical power
First Claim
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1. A device comprising:
- an autotransformer inter-connecting each phase to a midpoint, wherein the device corrects power factor of a 3-phase power converter; and
the autotransformer comprising two transformer legs, or the autotransformer comprises two transformer windings;
two diodes connecting each transformer leg to the mid-point, or two diodes connecting each transformer winding to the mid-point; and
a plurality of controllable bi-directional switches connecting as closed each transformer leg to the midpoint, or a plurality of controllable bi-directional switches connecting as closed each transformer winding to the midpoint,wherein two controllable bi-directional switches, each connected to a leg of the autotransformer, the autotransformer and the diodes form a five-state switching cell, or two controllable bi-directional switches, each connected to a winding of the autotransformer, the autotransformer and the diodes form a five-state switching cell.
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Abstract
A power factor correction of three-phase boost-type conversion is disclosed. Embodiments comprising multi-leg autotransformers are disclosed, e.g. comprising 3-phase low-pass filtering impedances such as capacitors between an input of a converter and a midpoint of the output.
15 Citations
6 Claims
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1. A device comprising:
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an autotransformer inter-connecting each phase to a midpoint, wherein the device corrects power factor of a 3-phase power converter; and
the autotransformer comprising two transformer legs, or the autotransformer comprises two transformer windings;two diodes connecting each transformer leg to the mid-point, or two diodes connecting each transformer winding to the mid-point; and a plurality of controllable bi-directional switches connecting as closed each transformer leg to the midpoint, or a plurality of controllable bi-directional switches connecting as closed each transformer winding to the midpoint, wherein two controllable bi-directional switches, each connected to a leg of the autotransformer, the autotransformer and the diodes form a five-state switching cell, or two controllable bi-directional switches, each connected to a winding of the autotransformer, the autotransformer and the diodes form a five-state switching cell. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification