Patents by Inventor Keith W. Kawate

Keith W. Kawate has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 9634479
    Abstract: Systems and methods of detecting arcing in a DC power system that can provide improved noise propagation immunity. The system includes at least two current sensors for monitoring at least two current outputs, respectively. The current sensors have reverse polarities, and are configured and arranged in parallel to provide a combined current output signal. The current sensors monitor the respective current outputs, which are provided for monitoring by the current sensors over at least two adjacent conductors. If arcing occurs at a location on a first conductor, then arcing (adjacent conductor crosstalk), having an arc current signature like that of the arcing on the first conductor, can occur at a location on the other adjacent conductor. The system can effectively cancel out such adjacent conductor crosstalk within a photovoltaic (PV) system, thereby improving the capability of an arc fault detection device for detecting arcing at the PV string level.
    Type: Grant
    Filed: December 23, 2013
    Date of Patent: April 25, 2017
    Assignee: SENSATA TECHNOLOGIES, INC.
    Inventors: Jianhong Kang, Christian V. Pellon, Lee Martin, Keith W. Kawate
  • Patent number: 9502885
    Abstract: Systems and methods of detecting arcing in DC power systems that can differentiate between DC arcs and load-switching noise. The systems and methods can determine, within a plurality of predetermined time intervals, at least the pulse count (PC) per predetermined time interval, and the pulse duration (PD) per predetermined time interval, in which the PC and the PD can correspond to the number and the intensity of potential arcing events in a DC power system, respectively. The systems and methods can process the PC and PD using one or more arc fault detection algorithms, thereby differentiating between DC arcs and load-switching noise with increased reliability.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: November 22, 2016
    Assignee: Sensata Technologies, Inc.
    Inventors: Lee Martin, Jianhong Kang, Christian V. Pellon, Keith W. Kawate
  • Patent number: 9465909
    Abstract: Systems and methods of detecting arcing in DC power systems that can differentiate between DC arcs and load-switching noise. The systems and methods can determine, within a plurality of predetermined time intervals, at least the pulse count (PC) per predetermined time interval, and the pulse duration (PD) per predetermined time interval, in which the PC and the PD can correspond to the number and the intensity of potential arcing events in a DC power system, respectively. The systems and methods can process the PC and PD using one or more arc fault detection algorithms, thereby differentiating between DC arcs and load-switching noise with increased reliability.
    Type: Grant
    Filed: November 16, 2012
    Date of Patent: October 11, 2016
    Assignee: Sensata Technologies, Inc.
    Inventors: Keith W. Kawate, Jianhong Kang
  • Publication number: 20140195177
    Abstract: Systems and methods of detecting arcing in a DC power system that can provide improved noise propagation immunity. The system includes at least two current sensors for monitoring at least two current outputs, respectively. The current sensors have reverse polarities, and are configured and arranged in parallel to provide a combined current output signal. The current sensors monitor the respective current outputs, which are provided for monitoring by the current sensors over at least two adjacent conductors. If arcing occurs at a location on a first conductor, then arcing (adjacent conductor crosstalk), having an arc current signature like that of the arcing on the first conductor, can occur at a location on the other adjacent conductor. The system can effectively cancel out such adjacent conductor crosstalk within a photovoltaic (PV) system, thereby improving the capability of an arc fault detection device for detecting arcing at the PV string level.
    Type: Application
    Filed: December 23, 2013
    Publication date: July 10, 2014
    Inventors: Jianhong Kang, Christian V. Pellon, Lee Martin, Keith W. Kawate
  • Publication number: 20140142873
    Abstract: Systems and methods of detecting arcing in DC power systems that can differentiate between DC arcs and load-switching noise. The systems and methods can determine, within a plurality of predetermined time intervals, at least the pulse count (PC) per predetermined time interval, and the pulse duration (PD) per predetermined time interval, in which the PC and the PD can correspond to the number and the intensity of potential arcing events in a DC power system, respectively. The systems and methods can process the PC and PD using one or more arc fault detection algorithms, thereby differentiating between DC arcs and load-switching noise with increased reliability.
    Type: Application
    Filed: November 16, 2012
    Publication date: May 22, 2014
    Inventors: Keith W. Kawate, Jianhong Kang
  • Publication number: 20140142874
    Abstract: Systems and methods of detecting arcing in DC power systems that can differentiate between DC arcs and load-switching noise. The systems and methods can determine, within a plurality of predetermined time intervals, at least the pulse count (PC) per predetermined time interval, and the pulse duration (PD) per predetermined time interval, in which the PC and the PD can correspond to the number and the intensity of potential arcing events in a DC power system, respectively. The systems and methods can process the PC and PD using one or more arc fault detection algorithms, thereby differentiating between DC arcs and load-switching noise with increased reliability.
    Type: Application
    Filed: March 15, 2013
    Publication date: May 22, 2014
    Inventors: Lee Martin, Jianhong Kang, Christian V. Pellon, Keith W. Kawate
  • Publication number: 20130009483
    Abstract: A remote resource can be configured to control connectivity of the power generator modules in a string. For example, a respective power generator module can include a current sense circuit that monitors for presence of communication signal. The power generator module can monitor for a presence of a remotely generated control signal over power line that is used by the respective power generator module to convey power to the external load. If the control signal is present on the power line, as generated by the remote resource, the control circuit in the respective power generator module activates the switch to an ON state such that respective activated power generator module is connected in series with the other activated power generator modules. If no keep-alive control signal is detected within a timeout period, the controller deactivates the respective power generator module.
    Type: Application
    Filed: May 29, 2012
    Publication date: January 10, 2013
    Inventors: Keith W. Kawate, Christopher E. Pinette, John R. Wezowicz, Thomas R. Maher, Michael B. Rose
  • Patent number: 7898781
    Abstract: An arc fault detection apparatus that provides for better discrimination of electrical arcing events from nuisance loads. The arc fault detection apparatus includes an arcing sense circuit having a comparator circuit with a variable threshold voltage that varies continuously with the line voltage. The arc fault detection apparatus has reduced susceptibility to nuisance tripping in the presence of sudden changes in the load current that occur outside of a specified time window centered on each zero crossing point of the line voltage.
    Type: Grant
    Filed: August 1, 2008
    Date of Patent: March 1, 2011
    Assignee: Sensata Technologies Massachusetts, Inc.
    Inventors: Keith W. Kawate, Lynwald Edmunds, Roger D. Mayer
  • Publication number: 20100027176
    Abstract: An arc fault detection apparatus that provides for better discrimination of electrical arcing events from nuisance loads. The arc fault detection apparatus includes an arcing sense circuit having a comparator circuit with a variable threshold voltage that varies continuously with the line voltage. The arc fault detection apparatus has reduced susceptibility to nuisance tripping in the presence of sudden changes in the load current that occur outside of a specified time window centered on each zero crossing point of the line voltage.
    Type: Application
    Filed: August 1, 2008
    Publication date: February 4, 2010
    Inventors: Keith W. Kawate, Lynwald Edmunds, Roger D. Mayer
  • Patent number: 7592819
    Abstract: An improved system and method of performing capacitance measurements that provides a fast digital response and a reduced output error. The capacitance measurement system includes a circuit configuration that has a variable capacitor and at least one reference capacitor connected to one another at a common node, which in turn is connected to the input of an analog-to-digital converter. The circuit configuration further includes an array of switches coupled between the variable and reference capacitors and the supply voltage, a reference voltage, and ground, respectively. The switched variable and reference capacitors are employed in conjunction with the A-to-D converter to perform, at the common node, a plurality of direct voltage measurements for use in generating an expression defining the capacitance of the variable capacitor.
    Type: Grant
    Filed: February 23, 2007
    Date of Patent: September 22, 2009
    Assignee: Sensata Technologies, Inc.
    Inventors: Keith W. Kawate, John A. Powning, Mark Genovese, Eric M. Visser
  • Patent number: 7190561
    Abstract: An apparatus and method for detecting arc faults that have reduced susceptibility to nuisance tripping. The apparatus includes a current sensor, an input sense circuit, an arcing sense circuit, a power supply, a tripping (firing) circuit, a processor, and an electromechanical interface. The current sensor monitors a power input comprising an AC current, and provides high frequency components of the. AC current to the input sense circuit. The input sense circuit filters and rectifies the AC signal, and provides the rectified signal to the arcing sense circuit. The arcing sense circuit provides a voltage level accumulated over a predetermined time period, and digital signals indicative of possible electrical arcing occurring during the sampling period, to the processor.
    Type: Grant
    Filed: September 9, 2004
    Date of Patent: March 13, 2007
    Assignee: Sensata Technologies, Inc.
    Inventors: Christian V. Pellon, Mark D. Rabiner, Michael Parker, Christopher A. Nicolls, Keith W. Kawate, Robert Zanelli, Roger D. Mayer, Lucien Fontaine, Michael J. Lavado, Lynwald Edmunds, Jeffrey B. Ting
  • Patent number: 7190562
    Abstract: An apparatus and method for detecting arc faults that have reduced susceptibility to nuisance tripping. The apparatus includes a current sensor, an input sense circuit, an arcing sense circuit, a power supply, a tripping (firing) circuit, a processor, and an electromechanical interface. The current sensor monitors a power input comprising an AC current, and provides high frequency components of the. AC current to the input sense circuit. The input sense circuit filters and rectifies the AC signal, and provides the rectified signal to the arcing sense circuit. The arcing sense circuit provides a voltage level accumulated over a predetermined time period, and digital signals indicative of possible electrical arcing occurring during the sampling period, to the processor.
    Type: Grant
    Filed: September 9, 2004
    Date of Patent: March 13, 2007
    Assignee: Sensata Technologies, Inc.
    Inventors: Christian V. Pellon, Mark D. Rabiner, Michael Parker, Christopher A. Nicolls, Keith W. Kawate, Robert Zanelli, Roger D. Mayer, Lucien Fontaine, Michael J. Lavado, Lynwald Edmunds, Jeffrey B. Ting
  • Patent number: 6980407
    Abstract: Current flowing through a load is monitored by a transformer (Tr1) having a small mutual inductance. The secondary coil is shorted through a rectifier circuit to deliver a charge which, in a first preferred embodiment, is connected to a log charge translator circuit comprising matching diodes (D9, D7 and D10, D8) and a capacitor (C2) to provide a capacitor voltage proportional to the log of the charge delivered through the rectifier circuit. The capacitor is reset after each measurement. In a modified embodiment, the log translator circuit comprises a pair of transistors (T1, T2) and a capacitor (C2). According to the preferred embodiments, two measurements of the capacitor voltage are taken each half cycle at a time determined by the absolute value of the line voltage.
    Type: Grant
    Filed: December 9, 2002
    Date of Patent: December 27, 2005
    Assignee: Texas Instrument Incorporated
    Inventors: Keith W. Kawate, Christian V. Pellon
  • Patent number: 6765391
    Abstract: An ASIC (14, 14′, 14″) conditions two independent outputs (VINM, VINP) of a full Wheatstone piezoresistive bridge (12) in separate conditioning paths. Each path is provided with a bridge supply voltage (VHB1, VHB2) which can serve as a temperature related input signal to respective offset and gain compensation control circuits. The half bridge outputs are inputted to respective amplifiers (U1, U2) along with a selected percentage of the temperature dependent bridge supply voltage. The outputs of the amplifiers provide a signal proportional to respective half bridge output voltage. In one embodiment, the output of the amplifier (U2) in one conditioning path of one half bridge is connected to the input of an amplifier (U4) in the other conditioning path to provide a signal in the one path proportional to the Wheatstone bridge differential output voltage and in the other path a signal proportional to the Wheatstone half bridge output voltage.
    Type: Grant
    Filed: October 22, 2002
    Date of Patent: July 20, 2004
    Assignee: Texas Instruments Incorporated
    Inventors: David L. Corkum, Keith W. Kawate, Thomas R. Maher
  • Publication number: 20040109269
    Abstract: Current flowing through a load is monitored by a transformer (Tr1) having a small mutual inductance. The secondary coil is shorted through a rectifier circuit to deliver a charge which, in a first preferred embodiment, is connected to a log charge translator circuit comprising matching diodes (D9, D7 and D10, D8) and a capacitor (C2) to provide a capacitor voltage proportional to the log of the charge delivered through the rectifier circuit. The capacitor is reset after each measurement. In a modified embodiment, the log translator circuit comprises a pair of transistors (T1, T2) and a capacitor (C2). According to the preferred embodiments, two measurements of the capacitor voltage are taken each half cycle at a time determined by the absolute value of the line voltage.
    Type: Application
    Filed: December 9, 2002
    Publication date: June 10, 2004
    Inventors: Keith W. Kawate, Christian V. Pellon
  • Publication number: 20040075447
    Abstract: An ASIC (14, 14′, 14″) conditions two independent outputs (VINM, VINP) of a full Wheatstone piezoresistive bridge (12) in separate conditioning paths. Each path is provided with a bridge supply voltage (VHB1, VHB2) which can serve as a temperature related input signal to respective offset and gain compensation control circuits. The half bridge outputs are inputted to respective amplifiers (U1, U2) along with a selected percentage of the temperature dependent bridge supply voltage. The outputs of the amplifiers provide a signal proportional to respective half bridge output voltage. In one embodiment, the output of the amplifier (U2) in one conditioning path of one half bridge is connected to the input of an amplifier (U4) in the other conditioning path to provide a signal in the one path proportional to the Wheatstone bridge differential output voltage and in the other path a signal proportional to the Wheatstone half bridge output voltage.
    Type: Application
    Filed: October 22, 2002
    Publication date: April 22, 2004
    Inventors: David L. Corkum, Keith W. Kawate, Thomas R. Maher
  • Patent number: 6642711
    Abstract: A differential pulse transformer having a drive coil (10a) and differential sense coils (10b) are disposed on a planar surface with a target (10e, 10f) movable over the sense coils to cause an imbalance in magnetic field when a large di/dt pulse is generated in the drive coil. A detection circuit senses the imbalance and provides a digital output accurately identifying the position of the target. Coil and target embodiments include relatively small secondary coils and relatively long targets (10b, 10e/10f; 12b, 12e/12f and 14b) and relatively large secondary coils and short targets (16b, 16c; 18b, 18c; 20b and 22b).
    Type: Grant
    Filed: January 10, 2002
    Date of Patent: November 4, 2003
    Assignee: Texas Instruments Incorporated
    Inventors: Keith W. Kawate, Gerhard A. Foelsche, Lidu Huang, Gerald H. Fleischfresser
  • Patent number: 6433554
    Abstract: An in-range fault detection system for a full wheatstone bridge element (12) having piezoresistive elements (R1, R2, R3, R4) has bridge outputs (INP, INM) connected to measuring means in the form of a first circuit portion (13) to provide a common mode voltage (VCM). A second circuit portion (14) is used to provide a centering voltage (C*VBRG) equal to the common mode voltage at the time of sensor calibration and a third circuit portion (15) is used to provide a small window voltage (W*VBRG) which is a fraction of bridge voltage. The value (W*VBRG) is subtracted from (C*VBRG) at a first summing circuit (SUM1) and added to (C*VBRG) at a second summing circuit (SUM2) and the results are each compared to the common mode voltage by comparators (Q1, Q2) which are then determined to be within or without a window of valid values by an OR gate (Q3).
    Type: Grant
    Filed: December 20, 1999
    Date of Patent: August 13, 2002
    Assignee: Texas Instruments Incorporated
    Inventors: Keith W. Kawate, David L. Corkum, Thomas R. Maher
  • Publication number: 20020097042
    Abstract: A differential pulse transformer having a drive coil (10a) and differential sense coils (10b) are disposed on a planar surface with a target (10e, 10f) movable over the sense coils to cause an imbalance in magnetic field when a large di/dt pulse is generated in the drive coil. A detection circuit senses the imbalance and provides a digital output accurately identifying the position of the target. Coil and target embodiments include relatively small secondary coils and relatively long targets (10b, 10e/10f; 12b, 12e/12f and 14b) and relatively large secondary coils and short targets (16b, 16c; 18b, 18c; 20b and 22b).
    Type: Application
    Filed: January 10, 2002
    Publication date: July 25, 2002
    Applicant: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Keith W. Kawate, Gerhard A. Foelsche, Lidu Huang, Gerald H. Fleischfresser
  • Patent number: 6058783
    Abstract: A capacitive transducer (10) which provides an output voltage in response to the application of a mechanical stimulus such as pressure or acceleration includes a signal conditioning integrated circuit (12) to which are connected a variable capacitor (C.sub.VAR), a reference capacitor (C.sub.REF), a linear correction capacitor (C.sub.LIN) as well as an integrating capacitor (C.sub.INT) and associated filtering components. The linear correction capacitor (C.sub.LIN) is used to offset a fixed parasitic charge associated with the variable capacitor. Any net error charge appearing on a detect, common node (pin 4) between the variable capacitor and the reference capacitor is cancelled out by means of an analog feedback network (22). In a modified embodiment a thermal compensation network (40) allows for correction for thermal error at a second temperature without having any affect at a first temperature.
    Type: Grant
    Filed: January 26, 1998
    Date of Patent: May 9, 2000
    Assignee: Texas Instruments Incorporated
    Inventors: James P. Berthold, Keith W. Kawate