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LOW-FREQUENCY CIRCUIT BREAKER

  • US 20120087049A1
  • Filed: 12/16/2011
  • Published: 04/12/2012
  • 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 semiconductor switch and the mechanical switch are connected in parallel with each other, and are connected in series with an alternating-current path forming part of an alternating-current circuit, andthe mechanical switch is constantly made conductive to cause a conduction current to flow to the alternating-current path, 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 path 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 path after switching the conduction current.

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