Sensor for detecting arcing faults

• US 7,536,914 B2
• Filed: 07/18/2006
• Issued: 05/26/2009
• Est. Priority Date: 07/18/2005
• Status: Active Grant

• Current Assignee: Johns Hopkins University
• Original Assignee: Johns Hopkins University
• Inventors: Land, H. Bruce III, Fowler, Kim R.
• Primary Examiner(s): Allen; Andre J
• Application Number:
  US11/488,264
• Publication Number:
  US 20070014060A1
• Time in Patent Office: 1,043 Days
• Field of Search: 737/05, 361/42
• US Class Current: 73/705
• CPC Class Codes: H02H 1/0023 sensing non electrical parameters, e.g. by optical, pneumatic, thermal or sonic sensors

Abstract

The present invention is directed to a sensor for detecting arcing faults, the sensor combining a photodetector, a pressure detector, and an accelerometer along with integrated circuitry. The circuitry controls each detector, operates the self-test circuitry, conditions the signals from the detectors, and communicates with the external network. The circuitry receives commands from the network and transmits the output decision from the sensor.

Claims

1. A photosensor comprising:

a photodetector,

an amplifier connected to said photodetector,

a bandpass filter connected to said amplifier,

a threshold comparator connected to said filter,

a storage element connected to said threshold comparator,

differential output driver having an input and two outputs, said input connected to said storage element and said differential output driver output transmitting two signals, a first signal and a second signal, the second signal at an opposite state to said first signal,

a differential receiver having two differential receiver inputs and one differential receiver output, said two differential receiver inputs connected to said two differential output driver outputs, and said differential receiver output connected to said storage element.

2. A photosensor of claim 1, further comprising:

a microcontroller connected to said threshold comparator,

a differential transceiver connected to said microcontroller and providing communication signals outside of said photosensor.

3. The photosensor of claim 2, wherein said microcontroller is a DSP.

4. The photosensor of claim 2, wherein said microcontroller is a FPGA.

5. The photosensor of claim 2, wherein said microcontroller is a ASIC.