Soft-starter AC-AC converter with integrated solid-state circuit breaker and method of operation thereof
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United States of America Patent
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Jun 15, 2021
Grant Date -
Mar 21, 2019
app pub date -
Sep 21, 2017
filing date -
Sep 21, 2017
priority date (Note) -
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status (Latency Note)
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Abstract
An AC-AC power converter, such as a motor soft starter, includes an input connectable to an AC source with a disconnect switch, an output connectable to an AC load, and phase lines connecting the input and output to transmit power. In-line solid-state switching blocks are connected between line terminals and load terminals of the AC source and AC load, respectively, such that each phase line includes a solid-state switching block connected thereto. Free-wheeling solid-state switching blocks are connected to the load terminals at one end and together at a common connection at another end, such that each phase line includes a free-wheeling solid-state switching block connected thereto. Each of the in-line and free-wheeling solid-state switching blocks comprises a bi-directional switching block that selectively controls current and withstands voltage in both directions. The switching blocks also provide soft-starter functions, variable speed control, and integrated circuit breaker protection capability.
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