Patents Assigned to SPD Electrical Systems
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Patent number: 8614868Abstract: A circuit fault detector and interrupter which consists of parallel current conduction paths, including a path through a mechanical contactor and a path through a power electronics switch having active feedback control. A fault can be detected by a fault detection circuit within 50 ?S of the occurrence of the fault, causing the mechanical contactor to be opened and the fault current to be commutated via a laminated, low-inductance bus through the power electronics switch. The power electronics switch is thereafter turned off as soon as possible, interrupting the fault current and absorbing the inductive energy in the circuit. The fault current can be interrupted within 200 microseconds of the occurrence of the fault, and the device reduces or eliminates arcing when the mechanical contactor is opened.Type: GrantFiled: June 7, 2012Date of Patent: December 24, 2013Assignee: SPD Electrical Systems, Inc.Inventors: Robert Lawler, John P. Barber, John I. Ykema
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Publication number: 20120243137Abstract: A circuit fault detector and interrupter which consists of parallel current conduction paths, including a path through a mechanical contactor and a path through a power electronics switch having active feedback control. A fault can be detected by a fault detection circuit within 50 ?S of the occurrence of the fault, causing the mechanical contactor to be opened and the fault current to be commutated via a laminated, low-inductance bus through the power electronics switch. The power electronics switch is thereafter turned off as soon as possible, interrupting the fault current and absorbing the inductive energy in the circuit. The fault current can be interrupted within 200 microseconds of the occurrence of the fault, and the device reduces or eliminates arcing when the mechanical contactor is opened.Type: ApplicationFiled: June 7, 2012Publication date: September 27, 2012Applicant: SPD ELECTRICAL SYSTEMSInventors: Robert Lawler, John P. Barber, John I. Ykema
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Patent number: 8223469Abstract: A circuit fault detector and interrupter which consists of parallel current conduction paths, including a path through a mechanical contactor and a path through a power electronics switch having active feedback control. A fault can be detected by a fault detection circuit within 50 microseconds of the occurrence of the fault, causing the mechanical contactor to be opened and the fault current to be commutated via a laminated, low-inductance bus through the power electronics switch. The power electronics switch is thereafter turned off as soon as possible, interrupting the fault current and absorbing the inductive energy in the circuit. The fault current can be interrupted within 200 microseconds of the occurrence of the fault, and the device reduces or eliminates arcing when the mechanical contactor is opened.Type: GrantFiled: January 5, 2010Date of Patent: July 17, 2012Assignee: SPD Electrical SystemsInventor: John P. Barber
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Publication number: 20110007432Abstract: A circuit fault detector and interrupter which consists of parallel current conduction paths, including a path through a mechanical contactor and a path through a power electronics switch having active feedback control. A fault can be detected by a fault detection circuit within 50 microseconds of the occurrence of the fault, causing the mechanical contactor to be opened and the fault current to be commutated via a laminated, low-inductance bus through the power electronics switch. The power electronics switch is thereafter turned off as soon as possible, interrupting the fault current and absorbing the inductive energy in the circuit. The fault current can be interrupted within 200 microseconds of the occurrence of the fault, and the device reduces or eliminates arcing when the mechanical contactor is opened.Type: ApplicationFiled: January 5, 2010Publication date: January 13, 2011Applicant: SPD ELECTRICAL SYSTEMSInventor: John P. Barber
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Patent number: 7667938Abstract: A circuit fault detector and interrupter which consists of parallel current conduction paths, including a path through a mechanical contactor and a path through a power electronics switch. A fault can be detected by a fault detection circuit within 50 microseconds of the occurrence of the fault, causing the mechanical contactor to be opened and the fault current to be commutated via a laminated, low-inductance bus through the power electronics switch. The power electronics switch is thereafter turned off as soon as possible, interrupting the fault current. The fault current can be interrupted within 200 microseconds of the occurrence of the fault, and the device reduces or eliminates arcing when the mechanical contactor is opened.Type: GrantFiled: December 18, 2007Date of Patent: February 23, 2010Assignee: SPD Electrical SystemsInventors: John I Ykema, John P. Barber, Antonios Challita