Disconnection of a string carrying direct current power

  • US 9,935,458 B2
  • Filed: 03/22/2016
  • Issued: 04/03/2018
  • Est. Priority Date: 12/09/2010
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • a differential current sensor configured to measure differential current of at least one photovoltaic string of a plurality of photovoltaic strings, the differential current measured by comparing respective currents in a first direct current (DC) power line and a second DC power line that interconnect the at least one photovoltaic string to the plurality of photovoltaic strings;

    a first switch connected in series with the first DC power line;

    a second switch connected in series with the first DC power line and in parallel with the first switch, wherein the first switch is configured to allow more of a current to flow than the second switch; and

    a controller circuit configured to operate the first switch or the second switch in response to a measurement of the differential current from the differential current sensor.

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