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LOW POWER DETECTION AND ALARM

  • US 20150294546A1
  • Filed: 11/19/2013
  • Published: 10/15/2015
  • Est. Priority Date: 11/20/2012
  • Status: Active Grant
First Claim
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1. An alarm apparatus for detecting radiation and/or pollutants including smoke and carbon monoxide, the apparatus comprising:

  • an alarm circuit including detection means for detecting said radiation and/or pollutants and an audible alarm emitting device;

    a power supply circuit, connectable to an external AC power supply, that supplies power to said alarm circuit; and

    a controller configured to operate the power supply circuit in a first mode of operation in which it supplies current to the alarm circuit at a first level less than that required to energise the audible alarm emitting device and, in response to the detection of said radiation and/or pollutants, to operate the power supply in a second mode of operation wherein it supplies current to the alarm circuit at a second level sufficient to energise the audible alarm emitting device.

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