Patents Assigned to Littelfuse, Inc.
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Publication number: 20190222040Abstract: A bi-stage temperature device may include a low temperature component, comprising a negative temperature coefficient (NTC) material; and a high temperature component, mechanically coupled to the low temperature component, and comprising a positive temperature coefficient (PTC) material, and a flexible substrate. The low temperature component may be arranged to generate a low temperature transition, the low temperature transition comprising a first change in electrical resistance, from a first resistance to a second resistance at a first temperature. The high temperature component may be arranged to generate a high temperature transition, the high temperature transition comprising a second change in electrical resistance, from a third resistance to a fourth resistance at a second temperature.Type: ApplicationFiled: January 18, 2018Publication date: July 18, 2019Applicant: Littelfuse, Inc.Inventors: Weiqing Guo, Jianhua Chen
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Publication number: 20190222100Abstract: A protection device may include a resistor, the resistor including a first end for coupling between a load and a second end for coupling to a DC source. The protection device may also include a capacitor having a first terminal coupled between the second end of the resistor and the DC source, and a second terminal coupled to ground, the capacitor further comprising a capacitor body, wherein the capacitor body comprises a ferroelectric material.Type: ApplicationFiled: January 11, 2019Publication date: July 18, 2019Applicant: Littelfuse, Inc.Inventors: Yuriy B. Matus, Kedar Bhatawadekar, Martin Pineda, Werner Johler
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Publication number: 20190219531Abstract: A waveguide system may include an inner core, and a conductor wound around the inner core in conductive coils having a coil length, wherein a voltage pulse received by the pulsed waveguide propagates as an induced wave having a group velocity, the group velocity being below a threshold velocity, wherein a reflection signal or an end of line signal generated within the conductor from the induced wave is detectable from the initial voltage pulse.Type: ApplicationFiled: March 26, 2019Publication date: July 18, 2019Applicant: Littelfuse, Inc.Inventors: Brian Johnson, Efrem Fesshaie, Rimantas Misevicius
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Publication number: 20190214213Abstract: Approaches herein provide a fuse assembly including a multi-part symmetrical housing. In some embodiments, the fuse assembly includes a core having a set of fusible elements extending between a first end fitting and a second end fitting, and a housing surrounding the core. The housing may include a first section having a first wall defining a first internal cavity, the first wall including a first slot and a first ridge, and a second section coupled to the first section, the second section having a second wall defining a second internal cavity. The second wall may include a second slot and a second ridge, wherein the first slot engages the second ridge and the second slot engages the first ridge. In some embodiments, the first and second sections define a set of openings for the first and second end fittings to extend therethrough.Type: ApplicationFiled: January 5, 2018Publication date: July 11, 2019Applicant: Littelfuse, Inc.Inventors: Nathan C. Siegwald, Dustin Kurtz
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Publication number: 20190214214Abstract: Provided herein are protection devices, such as fuses. In some embodiments, a fuse may include a hollow body having first and second ends, each of the first and second ends having an end surface and a side surface extending from the end surface. The fuse may further include a fusible element disposed within a central cavity of the hollow body, the fusible element extending between the first and second ends. The fuse may further include an inner cap formed over at least one of the first and second ends. The inner cap may include a center portion in contact with the fusible element, and a plurality of spring legs extending from the center portion, wherein the plurality of spring legs is in contact with the side surface of the first and/or second ends. The fuse may further include endcaps surrounding the first and second ends.Type: ApplicationFiled: January 5, 2018Publication date: July 11, 2019Applicant: Littelfuse, Inc.Inventor: Derek Lasini
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Publication number: 20190214208Abstract: A reflowable thermal fuse including a fuse body, a conductive composite element disposed within the fuse body, first and second conductive terminals connected to the conductive composite element and extending out of the fuse body, a removable barrier covering a surface of the conductive composite element and in electrical communication with the first and second conductive terminals, and a solvent element disposed on the removable barrier and separated from the conductive composite element by the removable barrier, wherein the removable barrier has a fusing temperature that is greater than a reflow temperature of the reflowable thermal fuse.Type: ApplicationFiled: January 9, 2018Publication date: July 11, 2019Applicant: Littelfuse, Inc.Inventors: Matthew P. Galla, Jianhua Chen
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Publication number: 20190199042Abstract: A universal serial bus (USB) cable including a power conductor configured to transmit power between a first device and a second device, a configuration channel (CC) conductor configured to allow the first device and the second device to determine whether a connection has been established via the USB cable, and a first positive temperature coefficient (PTC) element coupled to the CC conductor and configured to mitigate current flowing through the CC conductor if a temperature of the first PTC element rises above a predefined trip temperature.Type: ApplicationFiled: February 26, 2019Publication date: June 27, 2019Applicant: Littelfuse, Inc.Inventors: Boris Golubovic, Kunghao Yu
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Publication number: 20190199041Abstract: A circuit protection assembly includes a mounting block, a unitary fuse assembly, a post assembly and a plug connector. The unitary fuse assembly is disposed the mounting block and includes a plurality of fuses each of which is defined by a portion of a bus plate disposed on the lower surface of the mounting block to form a first terminal of the fuse, a second terminal disposed at least partially on the upper surface of the mounting block and a fuse element connecting the first terminal and the second terminal. The post assembly is disposed at least partially within the mounting block and a post extending from the block. The plug connector extends from a portion of the first terminal of at least one of the plurality of fuses.Type: ApplicationFiled: February 28, 2019Publication date: June 27, 2019Applicant: Littelfuse, Inc.Inventors: Julio Urrea, Gary M. Bold
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Patent number: 10324140Abstract: Zero sequence current sensors for single-phase and multiphase power systems are disclosed. In one implementation, a zero sequence current sensor is positioned between conductors associated with a single-phase power system or a multiphase power system. The current sensor may be shaped to accommodate maintaining a substantially equal distance between the conductors associated with the single-phase power system or the multiphase power system.Type: GrantFiled: September 6, 2016Date of Patent: June 18, 2019Assignee: Littelfuse, Inc.Inventors: Daniel R. Gilman, Kip M. Larson, Brian Johnson
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Patent number: 10326267Abstract: Provided herein are improved apparatuses and methods for protecting polarity sensitive loads in DC power circuits that include a power source, a relay coupled to the power source, and a polarity sensitive load coupled to the relay. A diode can be coupled between the power source and the relay. When the power source provides a DC voltage of a desired polarity, the diode can block a current from flowing to a coil of the relay. Consequently, the relay can provide a current path to the polarity sensitive load. When the power source provides a DC voltage of an incorrect or reverse polarity, the diode can allow a current to flow to the coil of the relay. In turn, the coil of the relay can be energized, causing the relay to disrupt the current path provided to the load, thereby protecting the polarity sensitive load from the reverse polarity condition.Type: GrantFiled: March 15, 2016Date of Patent: June 18, 2019Assignee: Littelfuse, Inc.Inventors: Brian D. Crispim, Geoffrey W. Schwartz
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Publication number: 20190157265Abstract: A transient voltage suppression (TVS) device, may include: a substrate base formed in a substrate, the substrate base comprising a semiconductor of a first conductivity type; and an epitaxial layer, disposed on the substrate base, on a first side of the substrate, and comprising a semiconductor of a second conductivity type. The epitaxial layer may include: a first portion, the first portion having a first layer thickness; and a second portion, the second portion having a second layer thickness, less than the first layer thickness, wherein the first portion and the second portion are disposed on a first side of the substrate, and wherein the first portion is electrically isolated from the second portion.Type: ApplicationFiled: November 17, 2017Publication date: May 23, 2019Applicant: Littelfuse, Inc.Inventor: James Allan Peters
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Publication number: 20190157263Abstract: A transient voltage suppression (TVS) device may include a substrate base formed in a substrate, the substrate base comprising a semiconductor of a first conductivity type. The TVS device may further include an epitaxial layer, comprising a first thickness, and disposed on the substrate base, on a first side of the substrate. The epitaxial layer may include a first epitaxial portion, the first epitaxial portion comprising the first thickness, and being formed of a semiconductor of a second conductivity type; and a second epitaxial portion, the second epitaxial portion comprising an upper region, the upper region formed of the second conductivity type, and having a second thickness less than the first thickness. A buried diffusion region may be disposed in a lower portion of the epitaxial layer in the second epitaxial region, the buried diffusion region being formed of a semiconductor of the first conductivity type, wherein the first portion is electrically isolated from the upper region of the second portion.Type: ApplicationFiled: November 20, 2017Publication date: May 23, 2019Applicant: Littelfuse, Inc.Inventor: James Allan Peters
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Patent number: 10297373Abstract: A jelly roll-type PTC device including a PTC material layer, a first electrode layer disposed on a first surface of the PTC material layer, a second electrode layer disposed on a second surface of the PTC material layer opposite the first surface between overlapping portions of the first electrode layer and the second electrode layer, and an insulation layer disposed on a surface of the second electrode layer opposite the PTC material layer and covering a region where the first electrode layer overlaps the second electrode layer, wherein the first electrode layer, the PTC material layer, the second electrode layer, and the insulation layer are rolled together to define a jelly roll structure with the PTC material layer providing an electrically conductive pathway between the overlapping first and second electrode layers, and with the insulation layer providing an electrically insulating barrier between the first and second electrode layers.Type: GrantFiled: April 19, 2018Date of Patent: May 21, 2019Assignee: Littelfuse, Inc.Inventors: Weiqing Guo, Boris Golubovic
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Patent number: 10290458Abstract: Embodiments of the fuse include a fuse body having a first end and a second end. A fuse element is disposed within a cavity of the fuse body, an end of the fuse element extending beyond an edge of the fuse body. An arc disc is disposed on the edge of the fuse body, and includes a notch such that the end of the fuse element extends to an outer surface of the arc disc. The end of the fuse element is configured to be folded over the outer surface of the arc disc. An end cap is disposed over the end of the fuse body and the arc disc, and the end cap includes a hole at a top surface. Solder deposited within the hole provides an electrical connection between the arc disc, the fuse element, and the end cap.Type: GrantFiled: August 24, 2016Date of Patent: May 14, 2019Assignee: Littelfuse, Inc.Inventors: Michael Schlaak, Ganesh Chennakesavelu, William Gonzalez
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Patent number: 10290457Abstract: Provided herein are protection devices, such as fuses. In some embodiments, a fuse may include a hollow body having first and second ends, each of the first and second ends having an end surface and a side surface extending from the end surface. The fuse may further include a fusible element disposed within a central cavity of the hollow body, the fusible element extending between the first and second ends. The fuse may further include an inner cap formed over at least one of the first and second ends. The inner cap may include a center portion in contact with the fusible element, and a plurality of spring legs extending from the center portion, wherein the plurality of spring legs is in contact with the side surface of the first and/or second ends. The fuse may further include endcaps surrounding the first and second ends.Type: GrantFiled: April 16, 2018Date of Patent: May 14, 2019Assignee: Littelfuse, Inc.Inventors: Derek Lasini, Michael Schlaak
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Patent number: 10283307Abstract: A surface mount fuse including a fuse body having a base including a floor and a plurality of adjoining sidewalls defining an interior cavity, wherein top edges of the sidewalls define a recessed shoulder bordering the interior cavity, and a cover including a main body disposed on the recessed shoulder and enclosing the interior cavity, first and second terminals extending through opposing sidewalls of the base, the first and second terminals extending around the opposing sidewalls and the cover and disposed in abutment therewith to secure the cover to the base, and a fusible element extending through the interior cavity and connected to the first and second terminals.Type: GrantFiled: April 5, 2017Date of Patent: May 7, 2019Assignee: Littelfuse, Inc.Inventors: Conrado de Leon, Albert Enriquez
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Patent number: 10281908Abstract: A motor protection relay including a housing and a printed circuit board disposed within the housing, the printed circuit board including a central processing unit and a wireless communication interface, the wireless communication interface adapted to receive wireless communication signals for configuring operating parameters of the motor protection relay via the central processing unit.Type: GrantFiled: October 23, 2017Date of Patent: May 7, 2019Assignee: Littelfuse, Inc.Inventor: Kip M. Larson
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Publication number: 20190131101Abstract: An overcurrent protection device according to an embodiment of the present disclosure may include a first electrode disposed substantially parallel to a second electrode. A material may be disposed between the first electrode and the second electrode. A plurality of conductive material nodules may be disposed in the material between the first electrode and the second electrode, including a first conductive material nodule at least partially contacting an inner surface of the first electrode and a second conductive material nodule at least partially contacting an inner surface of the second electrode and the first conductive material nodule. In response to an overcurrent condition the material may be configured to expand, such that the contact between the first electrode, the first conductive material nodule, the second conductive material nodule, and the second electrode is at least partially interrupted.Type: ApplicationFiled: November 2, 2017Publication date: May 2, 2019Applicant: Littelfuse, Inc.Inventors: Martin G. Pineda, Sergio Fuentes, Chun-Kwan Tsang
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Publication number: 20190131039Abstract: A method of forming a positive temperature coefficient (PTC) device, the method including providing a core formed of a PTC material, the core having an electrode disposed on a first surface thereof and a second electrode disposed on a second surface thereof, connecting a first lead element to the first electrode, applying an oxygen barrier epoxy to at least portions of the core, the first electrode, the second electrode, and the first lead element, and curing the oxygen barrier epoxy to form an oxygen barrier package surrounding at least portions of the core, the first electrode, the second electrode, and the first lead element.Type: ApplicationFiled: November 2, 2017Publication date: May 2, 2019Applicant: Littelfuse, Inc.Inventors: Martin G. Pineda, Kedar Bhatawadekar, Dong Yu
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Publication number: 20190119464Abstract: A polymer positive temperature coefficient (PPTC) material. The PPTC material may include a polymer matrix, a conductive filler, and a thermal stabilizer.Type: ApplicationFiled: October 23, 2017Publication date: April 25, 2019Applicant: Littelfuse, Inc.Inventors: Jianhua Chen, Chun-Kwan Tsang