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|United States Patent||9,784,449|
|Margolin||October 10, 2017|
This invention relates to the field of sensing flames in equipment using a combustion burner such as gas furnaces by using the electrical properties of flames. In a first group of embodiments flame rectification is used to cause distortion of a signal having a selected waveform. A harmonic of the distorted waveform is detected thereby providing flame proof. In a second group of embodiments flame rectification is used as a mixer to cause two signals having selected waveforms to produce sum and difference signals. The sum and/or difference signals are detected thereby providing flame proof.
|Inventors:||Margolin; Jed (VC Highlands, NV)|
|Filed:||June 26, 2014|
|Document Identifier||Publication Date|
|US 20150348393 A1||Dec 3, 2015|
|Application Number||Filing Date||Patent Number||Issue Date|
|62005199||May 30, 2014|
|Current U.S. Class:||1/1|
|Current CPC Class:||F23N 5/123 (20130101); G08B 17/125 (20130101); Y02T 50/677 (20130101); F23N 2023/42 (20130101); F23N 2023/10 (20130101)|
|Current International Class:||G08B 17/12 (20060101); F23N 5/12 (20060101)|
|Field of Search:||;340/577|
|3301307||January 1967||Kobayashi et al.|
|3956080||May 1976||Hradcovsky et al.|
|6404342||June 2002||Planer et al.|
|8310801||November 2012||McDonald et al.|
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