Patents by Inventor Bradley M. Lehman
Bradley M. Lehman 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).
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Publication number: 20230400500Abstract: A series PV arc fault detection method and apparatus demodulates a current signal provided by a DC power source to an inverter to eliminate a DC component and periodic noise. Autocorrelation coefficients are generated from the demodulated current signal to monitor noise energy and variation and, based on the noise energy, a determination is made if an arc fault has occurred.Type: ApplicationFiled: April 19, 2023Publication date: December 14, 2023Applicants: MERSEN USA EP Corp., Northeastern UniversityInventors: Roy A. Ball, Jonathan C. Kim, Bradley M. Lehman
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Patent number: 11768252Abstract: Pink noise analysis, along with unique properties of the photovoltaic (PV) operating point of both the instantaneous current and voltage signal, is used to distinguish arc faults from other noisy loads or PV degradations.Type: GrantFiled: March 18, 2022Date of Patent: September 26, 2023Assignees: MERSEN USA EP CORP., Northeastern UniversityInventors: Roy A. Ball, Jonathan C. Kim, Bradley M. Lehman
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Patent number: 10992144Abstract: A circuit provides for regulating charge and discharge current of a battery. A bypass circuit is connected to a terminal of the battery and connected in parallel with a load switch. The bypass circuit may selectively direct a bypass current around the load switch. A controller can operate in plural modes to control the bypass circuit. In a first mode, the controller controls one or more parameters of the bypass current based on values corresponding to a current at the terminal, a voltage at the terminal, and/or a temperature of the battery. In a second mode, the controller controls the bypass circuit to disable the bypass current.Type: GrantFiled: May 17, 2018Date of Patent: April 27, 2021Assignee: Galley Power LLCInventors: Peng Li, Liang Yan, Bradley M. Lehman
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Patent number: 10509067Abstract: A method for detecting an arc fault in AC circuits. The method includes monitoring disturbances in an AC voltage signal by analyzing multi-dimensional energy points. A voltage signal is captured and the zero-crossing, minimum peak, and maximum peak are identified. Arcing signatures between the maximum and minimum peaks of the captured AC voltage signal are analyzed to detect an arc fault.Type: GrantFiled: July 6, 2017Date of Patent: December 17, 2019Assignees: Mersen USA Newburyport-MA, LLC, Northeastern UniversityInventors: Jonathan C. Kim, Bradley M. Lehman, Dorin Octavian Neacsu, Roy Ball
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Patent number: 10270344Abstract: A multiphase switching DC-DC converter generates an output voltage from an input voltage. The converter includes multiphase coupled inductors having lateral magnetic core and non-looping conductors. The currents in conductors of the inductors flow in opposite directions, and therefore, the coupled inductors are inversely coupled and have a relatively low resistance and relatively small core volume. The reduced resistance of the inductor windings combined with smaller volume of magnetic core in the coupled inductors increases energy conversion efficiency and improves transient response of the converter. The coupled inductors can be employed in buck or boost or buck-boost converters, and they can also be used in buck or boost or buck-boost derived converters with isolation transformers.Type: GrantFiled: February 6, 2017Date of Patent: April 23, 2019Inventors: Wenkang Huang, Bradley M. Lehman
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Publication number: 20190011489Abstract: A method for detecting an arc fault in AC circuits. The method includes monitoring disturbances in an AC voltage signal by analyzing multi-dimensional energy points. A voltage signal is captured and the zero-crossing, minimum peak, and maximum peak are identified. Arcing signatures between the maximum and minimum peaks of the captured AC voltage signal are analyzed to detect an arc fault.Type: ApplicationFiled: July 6, 2017Publication date: January 10, 2019Applicants: Mersen USA Newburyport-MA, LLC, Northeastern UniversityInventors: Jonathan C. Kim, Bradley M. Lehman, Dorin Octavian Neacsu, Roy Ball
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Publication number: 20180337536Abstract: A circuit provides for regulating charge and discharge current of a battery. A bypass circuit is connected to a terminal of the battery and connected in parallel with a load switch. The bypass circuit may selectively direct a bypass current around the load switch. A controller can operate in plural modes to control the bypass circuit. In a first mode, the controller controls one or more parameters of the bypass current based on values corresponding to a current at the terminal, a voltage at the terminal, and/or a temperature of the battery. In a second mode, the controller controls the bypass circuit to disable the bypass current.Type: ApplicationFiled: May 17, 2018Publication date: November 22, 2018Inventors: Peng Li, Liang Yan, Bradley M. Lehman
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Patent number: 9584028Abstract: An apparatus, method, and system are provided for power conversion to supply power to a load such as a plurality of light emitting diodes. An exemplary apparatus comprises: a first power converter stage having a first power switch and a first inductive element; a second power converter stage having a second power switch and a second inductive element; a plurality of sensors; and a controller. The second power converter stage provides an output current to the load. The controller is adapted to use a sensed input voltage to determine a switching period, and is further adapted to turn the first and second power switches into an on-state at a frequency substantially corresponding to the switching period while maintaining a switching duty cycle within a predetermined range.Type: GrantFiled: May 4, 2015Date of Patent: February 28, 2017Assignee: Chemtron Research LLCInventors: Anatoly Shteynberg, Harry Rodriguez, Bradley M. Lehman
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Publication number: 20150311808Abstract: An apparatus, method, and system are provided for power conversion to supply power to a load such as a plurality of light emitting diodes. An exemplary apparatus comprises: a first power converter stage having a first power switch and a first inductive element; a second power converter stage having a second power switch and a second inductive element; a plurality of sensors; and a controller. The second power converter stage provides an output current to the load. The controller is adapted to use a sensed input voltage to determine a switching period, and is further adapted to turn the first and second power switches into an on-state at a frequency substantially corresponding to the switching period while maintaining a switching duty cycle within a predetermined range.Type: ApplicationFiled: May 4, 2015Publication date: October 29, 2015Applicant: Point Somee Limited Liability CompanyInventors: Anatoly Shteynberg, Harry Rodriguez, Bradley M. Lehman
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Patent number: 9148922Abstract: Exemplary embodiments provide for power conversion for solid state lighting coupled to a first switch, such as a dimmer switch. An exemplary apparatus includes a switching power supply and a first adaptive interface circuit. The first adaptive interface circuit may include a resistive impedance coupled in series to a reactive impedance. The apparatus may also include a second adaptive interface circuit including a second switch coupled to the reactive impedance. The second adaptive interface circuit is configured to conduct current from the first switch in a second current path. At least one of the first and second adaptive interface circuits may be configured to damp oscillation when the first switch turns on.Type: GrantFiled: May 1, 2014Date of Patent: September 29, 2015Assignee: Point Somee Limited Liability CompanyInventors: Anatoly Shteynberg, Harry Rodriguez, Bradley M. Lehman, Dongsheng Zhou, Harlan H. Ohara
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Patent number: 9054590Abstract: An apparatus, method, and system are provided for power conversion to supply power to a load such as a plurality of light emitting diodes. An exemplary apparatus comprises: a first power converter stage having a first power switch and a first inductive element; a second power converter stage having a second power switch and a second inductive element; a plurality of sensors; and a controller. The second power converter stage provides an output current to the load. The controller is adapted to use a sensed input voltage to determine a switching period, and is further adapted to turn the first and second power switches into an on-state at a frequency substantially corresponding to the switching period while maintaining a switching duty cycle within a predetermined range.Type: GrantFiled: November 29, 2012Date of Patent: June 9, 2015Assignee: Point Somee Limited Liability CompanyInventors: Anatoly Shteynberg, Harry Rodriguez, Bradley M. Lehman
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Patent number: 9041305Abstract: Representative embodiments of the invention provide a system, apparatus, and method of controlling an intensity and spectrum of light emitted from a solid state lighting system. The solid state lighting system has a first emitted spectrum at a full intensity level and at a selected temperature, with a first electrical biasing for the solid state lighting system producing a first wavelength shift, and a second electrical biasing for the solid state lighting system producing a second, opposing wavelength shift. Representative embodiments provide for receiving information designating a selected intensity level or a selected temperature; and providing a combined first electrical biasing and second electrical biasing to the solid state lighting system to generate emitted light having the selected intensity level and having a second emitted spectrum within a predetermined variance of the first emitted spectrum over a predetermined range of temperatures.Type: GrantFiled: April 8, 2014Date of Patent: May 26, 2015Assignee: Point Somee Limited Liability CompanyInventors: Anatoly Shteynberg, Harry Rodriguez, Bradley M. Lehman, Dongsheng Zhou
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Publication number: 20140239832Abstract: Exemplary embodiments provide for power conversion for solid state lighting coupled to a first switch, such as a dimmer switch. An exemplary apparatus includes a switching power supply and a first adaptive interface circuit. The first adaptive interface circuit may include a resistive impedance coupled in series to a reactive impedance. The apparatus may also include a second adaptive interface circuit including a second switch coupled to the reactive impedance. The second adaptive interface circuit is configured to conduct current from the first switch in a second current path. At least one of the first and second adaptive interface circuits may be configured to damp oscillation when the first switch turns on.Type: ApplicationFiled: May 1, 2014Publication date: August 28, 2014Applicant: Point Somee Limited Liability CompanyInventors: Anatoly Shteynberg, Harry Rodriguez, Bradley M. Lehman, Dongsheng Zhou, Harlan H. Ohara
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Publication number: 20140217915Abstract: Representative embodiments of the invention provide a system, apparatus, and method of controlling an intensity and spectrum of light emitted from a solid state lighting system. The solid state lighting system has a first emitted spectrum at a full intensity level and at a selected temperature, with a first electrical biasing for the solid state lighting system producing a first wavelength shift, and a second electrical biasing for the solid state lighting system producing a second, opposing wavelength shift. Representative embodiments provide for receiving information designating a selected intensity level or a selected temperature; and providing a combined first electrical biasing and second electrical biasing to the solid state lighting system to generate emitted light having the selected intensity level and having a second emitted spectrum within a predetermined variance of the first emitted spectrum over a predetermined range of temperatures.Type: ApplicationFiled: April 8, 2014Publication date: August 7, 2014Applicant: Point Somee Limited Liability CompanyInventors: Anatoly Shteynberg, Harry Rodriguez, Bradley M. Lehman, Dongsheng Zhou
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Patent number: 8749177Abstract: Representative embodiments of the disclosure provide a system, apparatus, and method of controlling an intensity and spectrum of light emitted from a solid state lighting system. The solid state lighting system has a first emitted spectrum at full intensity and at a selected temperature, with a first electrical biasing for the solid state lighting system producing a first wavelength shift, and a second electrical biasing for the solid state lighting system producing a second, opposing wavelength shift. Representative embodiments provide for receiving information designating a selected intensity level or a selected temperature and providing a combined first electrical biasing and second electrical biasing to the solid state lighting system to generate emitted light having the selected intensity level and having a second emitted spectrum within a predetermined variance of the first emitted spectrum over a predetermined range of temperatures.Type: GrantFiled: August 31, 2012Date of Patent: June 10, 2014Assignee: Point Somee Limited Liability CompanyInventors: Anatoly Shteynberg, Harry Rodriguez, Bradley M. Lehman, Dongsheng Zhou
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Patent number: 8742674Abstract: Exemplary embodiments provide an apparatus, system and method for power conversion to provide power to solid state lighting, and which may be coupled to a first switch, such as a dimmer switch. An exemplary system comprises: a switching power supply; solid state lighting; a first adaptive interface circuit to provide a resistive impedance to the first switch and conduct current from the first switch in a default mode; and a second adaptive interface circuit to create a resonant process. An exemplary apparatus comprises: a switching power supply; and an adaptive interface circuit comprising a resistive impedance coupled in series to a reactive impedance to conduct current from the first switch in a first current path in a default mode, and further comprising a second switch coupled to the reactive impedance to conduct current from the first switch in a second current path, with the adaptive interface circuit further damping oscillation when the first switch turns on.Type: GrantFiled: December 15, 2010Date of Patent: June 3, 2014Assignee: Point Somee Limited Liability CompanyInventors: Anatoly Shteynberg, Harry Rodriguez, Bradley M. Lehman, Dongsheng Zhou, Harlan H. Ohara
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Patent number: 8723766Abstract: Representative embodiments of the disclosure provide a system and apparatus for controlling an intensity and spectrum of light emitted from a solid state lighting system. The solid state lighting system has a first emitted spectrum at full intensity and at a selected temperature, with a first electrical biasing for the solid state lighting system producing a first wavelength shift, and a second electrical biasing for the solid state lighting system producing a second, opposing wavelength shift. Representative embodiments provide for receiving information designating a selected intensity level and a selected temperature and providing a combined first electrical biasing and second electrical biasing to the solid state lighting system to generate emitted light having the selected intensity level and having a second emitted spectrum within a predetermined variance of the first emitted spectrum over a predetermined range of temperatures.Type: GrantFiled: July 25, 2012Date of Patent: May 13, 2014Assignee: Point Somee Limited Liability CompanyInventors: Anatoly Shteynberg, Harry Rodriguez, Bradley M. Lehman, Dongsheng Zhou
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Patent number: 8704456Abstract: Representative embodiments of the invention provide a system, apparatus, and method of controlling an intensity and spectrum of light emitted from a solid state lighting system. The solid state lighting system has a first emitted spectrum at a full intensity level and at a selected temperature, with a first electrical biasing for the solid state lighting system producing a first wavelength shift, and a second electrical biasing for the solid state lighting system producing a second, opposing wavelength shift. Representative embodiments provide for receiving information designating a selected intensity level or a selected temperature; and providing a combined first electrical biasing and second electrical biasing to the solid state lighting system to generate emitted light having the selected intensity level and having a second emitted spectrum within a predetermined variance of the first emitted spectrum over a predetermined range of temperatures.Type: GrantFiled: January 15, 2013Date of Patent: April 22, 2014Assignee: Point Somee Limited Liability CompanyInventors: Anatoly Shteynberg, Harry Rodriguez, Bradley M. Lehman, Dongsheng Zhou
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Patent number: 8704462Abstract: Representative embodiments provide an apparatus, system, and method for power conversion to provide power to solid state lighting, and which may be coupled to a first switch, such as a dimmer switch. A representative system for power conversion comprises: a switching power supply comprising a second, power switch; solid state lighting coupled to the switching power supply; a voltage sensor; a current sensor; a memory; a first adaptive interface circuit to provide a resistive impedance to the first switch and conduct current from the first switch in a default mode; a second adaptive interface circuit to create a resonant process when the first switch turns on; and a controller to modulate the second adaptive interface circuit when the first switch turns on to provide a current path during the resonant process of the switching power supply.Type: GrantFiled: May 13, 2013Date of Patent: April 22, 2014Assignee: Point Somee Limited Liability CompanyInventors: Anatoly Shteynberg, Harry Rodriguez, Bradley M. Lehman, Dongsheng Zhou
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Patent number: 8558470Abstract: Exemplary embodiments provide an apparatus, system and method for power conversion to provide power to solid state lighting, and which may be coupled to a first switch, such as a dimmer switch. An exemplary system comprises: a switching power supply; solid state lighting; a first adaptive interface circuit to provide a resistive impedance to the first switch and conduct current from the first switch in a default mode; and a second adaptive interface circuit to create a resonant process. An exemplary apparatus comprises: a switching power supply; and an adaptive interface circuit comprising a resistive impedance coupled in series to a reactive impedance to conduct current from the first switch in a first current path in a default mode, and further comprising a second switch coupled to the reactive impedance to conduct current from the first switch in a second current path, with the adaptive interface circuit further damping oscillation when the first switch turns on.Type: GrantFiled: May 12, 2010Date of Patent: October 15, 2013Assignee: Point Somee Limited Liability CompanyInventors: Anatoly Shteynberg, Harry Rodriguez, Dongsheng Zhou, Bradley M. Lehman