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Low-frequency circuit breaker

  • US 9,646,795 B2
  • Filed: 01/06/2016
  • Issued: 05/09/2017
  • Est. Priority Date: 06/25/2009
  • Status: Active Grant
First Claim
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1. A low-frequency circuit breaker, comprising:

  • a semiconductor switch and a mechanical switch, the semiconductor switch configured by connecting first and second thyristors in anti-parallel with each other, whereinthe mechanical switch is connected in series with alternating-current paths forming part of an alternating-current circuit, and the semiconductor switch is connected between different phases of the alternating-current paths, andthe mechanical switch is constantly made conductive to cause a conduction current to flow to the alternating-current paths, the first and second thyristors are made conductive by supplying a gate signal to the first and second thyristors at least immediately before current cutoff, the conduction current through the alternating-current paths is switched to flow through the thyristors by opening the mechanical switch, and the gate signal to the thyristors is turned off to cut off the conduction current through the alternating-current paths after switching the conduction current.

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