Electric power converter
AssigneeHitachi, Ltd.
InventorsHikaru Meguro, Hiroshi Ikarashi, Keizo Shimada, Masashi Toyota
Life of this patent
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Abstract
By reduction in loss and noise of a three-phase reactor on the AC side of an electric power converter, compactness and reduction in weight of the reactor are realized, and countermeasures for heat and noise are reduced, and a specific frequency component is reduced, thus cost reduction and conversion efficiency are improved, and carriers of a controller are prepared in correspondence to the phases of the electric power converter, and moreover a phase difference of each carrier is set properly.
Claims10
A method of converting electric power between AC power and DC power, comprising the steps:
- providing a switching device between an AC circuit and at least one DC line of a DC circuit;
- providing a reactor having one side connected to said switching device and another side connected to at least one phase of said AC circuit and said another side being further connected to any one of said at least one DC line by at least one capacitor;
- providing a plurality of carrier waves having a phase difference among said plurality of carrier waves;
- generating a signal as a function of characteristics said plurality of carrier waves;
- and
- converting DC power on said at least one DC line to AC power or converting AC power on said AC circuit to DC power to thereby provide improved conversion efficiency by reduction in energy loss and a reduction in noise from the reactor.
An apparatus for converting electric power between AC power and DC power, comprising:
- a switching device connected between an AC circuit and at least one DC line of a DC circuit;
- a reactor having one side connected to said switching device and another side connected to at least one phase of said AC circuit and said another side being further connected to any one of said at least one DC line by at least one capacitor;
- a carrier source outputting a plurality of carrier waves having a phase difference among said plurality of carrier waves;
- signal generator device outputting a signal as a function of characteristics of said plurality of carrier waves, whereby said apparatus provides conversion of DC power on said at least one DC line to AC power or conversion AC power on said AC circuit to DC power to thereby provide improved conversion efficiency by reduction in energy loss and a reduction in noise from the reactor.
Dependencies are inferred from the claim text.