Power conversion device
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United States of America Patent
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Oct 1, 2024
Grant Date -
Aug 17, 2023
app pub date -
Aug 4, 2020
filing date -
Aug 4, 2020
priority date (Note) -
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status (Latency Note)
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Abstract
Provided is a gradationally controlled inverter formed by series-connection between: a main inverter circuitry which has main inverter arms for outputting AC voltages for respective phases, and to which a voltage of a DC source is applied through a DC busbar; and a sub-inverter circuitry having three single-phase sub-inverters. Each of short-circuit switches is connected between an input terminal and an output terminal of a corresponding one of the sub-inverters. At the time of a failure of the sub-inverter, a bypass for current is formed for only the failure phase by causing short-circuiting at the short-circuit switch connected to the sub-inverter, and only the main inverter arm for the failure phase is operated as a three-level inverter.
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