초록 ▼

Disclosed is an arc detection circuit for monitoring an electrical distribution system which results in detecting arcing in the electrical distribution system and the ability to provide notification and protection for such arcing. The system functions to monitor the electrical distribution system to

Disclosed is an arc detection circuit for monitoring an electrical distribution system which results in detecting arcing in the electrical distribution system and the ability to provide notification and protection for such arcing. The system functions to monitor the electrical distribution system to sense the frequencies of signals in the system using appropriate filtering. One type of filtering which may be used is based upon a heterodyning circuit which provides variable frequency filtering for filtering a signal representative of the current in at least one electrical circuit of the electrical system. The heterodyning circuit output is configured to produce a signal which may be logarithmically related to the filtered signal. If the output signal exceeds a predetermined limit (representative of noise) for a predetermined period (representative of a typical arc duration), the system generates an arc signal. The arc signal may then be used to operate a circuit interrupter or an indicator in a circuit protection system.

대표청구항 ▼

Disclosed is an arc detection circuit for monitoring an electrical distribution system which results in detecting arcing in the electrical distribution system and the ability to provide notification and protection for such arcing. The system functions to monitor the electrical distribution system to

Disclosed is an arc detection circuit for monitoring an electrical distribution system which results in detecting arcing in the electrical distribution system and the ability to provide notification and protection for such arcing. The system functions to monitor the electrical distribution system to sense the frequencies of signals in the system using appropriate filtering. One type of filtering which may be used is based upon a heterodyning circuit which provides variable frequency filtering for filtering a signal representative of the current in at least one electrical circuit of the electrical system. The heterodyning circuit output is configured to produce a signal which may be logarithmically related to the filtered signal. If the output signal exceeds a predetermined limit (representative of noise) for a predetermined period (representative of a typical arc duration), the system generates an arc signal. The arc signal may then be used to operate a circuit interrupter or an indicator in a circuit protection system. shock is adapted to be applied to the heart between (a) the internal electrode, and (b) the electrodes of the quasi-Faraday cage when the electrodes of the cage are electrically coupled via the switching circuitry; and wherein the electrodes of the quasi-Faraday cage surround at least about 70% of the heart during application of the electric shock so as to confine a significant portion of a shock field to the heart itself so as to prevent the shock from significantly stimulating extracardiac muscle(s) and/or nerve(s) tissue. 4. An implantable cardioverter defibrillator (ICD) system for applying electric shock to a heart of a patient, the ICD system having an internal electrode adapted to be placed inside of the heart of the patient, the ICD system comprising: a quasi-Faraday cage including electrodes; wherein electrodes of the quasi-Faraday cage are adapted to be wrapped around at least about 60% of the heart during application of the electric shock so that electric shock is adapted to be applied to the heart between the electrodes of the quasi-Faraday cage and the electrode of the ICD adapted to be located inside of the heart to make the shock less painful as a significant portion of a defibrillation shock field is confined to the heart itself so as to prevent the shock from significantly stimulating extracardiac tissue.