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System and method for synchronized rapid shutdown of electrical devices

  • US 10,388,802 B2
  • Filed: 07/06/2016
  • Issued: 08/20/2019
  • Est. Priority Date: 07/06/2015
  • Status: Active Grant
First Claim
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1. A system comprising:

  • a plurality of circuits, each circuit comprising;

    an electrical device, anda control circuit configured to turn the electrical device on and off, each control circuit comprising a current transformer having a primary winding and a secondary winding, the secondary winding operably coupled to the electrical device;

    an alternating current (AC) constant current source providing a substantially constant control current, the AC constant current source not being a step down transformer directly connected to an AC mains panel;

    a switching device configured to switch on and off; and

    conductors connecting the primary winding of each of the current transformers of the plurality of circuits, the AC constant current source, and the switching device in series to form a current loop, the current loop transmitting the substantially constant control current;

    wherein when the switching device is switched from on to off, the current transformers of the plurality of circuits stop receiving the control current, thereby causing the electrical devices of the plurality of circuits to shut off simultaneously.

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