Invention Grant
US09298204B2 AC to AC converter and method of operation thereof for soft starting motors and other applications 有权
AC到AC转换器及其操作方法,用于软启动电机和其他应用

AC to AC converter and method of operation thereof for soft starting motors and other applications
Abstract:
A load control device includes an input and an output connectable to an AC source and an AC load, respectively, with one or more supply lines each corresponding to a phase in the load connecting the input and output. Line-side switches are connected between a line terminal and load terminal, and floating-neutral side switches are connected to the load terminal at one end and at a common neutral connection at another end. A controller determines a direction of current flow on each of the supply lines, determines a switching pattern for each of the line-side switches and each of the floating-neutral side switches based on the determined direction of current flow, and causes each of the line-side switches and floating-neutral side switches to operate in an On condition or an Off condition according to the determined switching pattern, such that a controlled uninterrupted current is provided to the AC load.
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