System and method for protection during inverter shutdown in distributed power installations

  • US 11,031,861 B2
  • Filed: 02/09/2018
  • Issued: 06/08/2021
  • Est. Priority Date: 12/06/2006
  • Status: Active Grant
First Claim
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1. A system comprising:

  • a power module comprising an input terminal and an output terminal, wherein the input terminal is configured to receive direct-current input power and the output terminal is configured to output direct-current output power when the power module is enabled;

    a receiver circuit configured to;

    obtain a measurement at the output terminal of the power module;

    obtain a keep-alive signal, comprising a predetermined frequency corresponding to an inverter, by removing a direct-current component of the measurement;

    up-convert the keep-alive signal from the predetermined frequency to a second frequency higher than the predetermined frequency; and

    generate a control signal based on the keep-alive signal at the second frequency; and

    a controller configured to;

    detect, based on the control signal, that the keep-alive signal is superimposed on the output terminal of the power module and comprises the predetermined frequency corresponding to the inverter;

    enable the power module in response to the detection that the keep-alive signal comprises the predetermined frequency corresponding to the inverter;

    detect an absence of the keep-alive signal; and

    disable the power module in response to the detection of the absence of the keep-alive signal.

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