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Littelfuse Inc patents


Recent patent applications related to Littelfuse Inc. Littelfuse Inc is listed as an Agent/Assignee. Note: Littelfuse Inc may have other listings under different names/spellings. We're not affiliated with Littelfuse Inc, we're just tracking patents.

ARCHIVE: New 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 | Company Directory "L" | Littelfuse Inc-related inventors


Ventilated fuse housing

A fuse including a first housing part and a second housing part that are joined together to define a cavity, a fuse element disposed within the cavity, a first terminal extending from a first end of the fuse element and out of the housing, and a second terminal extending from a second end of the fuse element and out of the housing, the housing having a vent channel extending from an outer surface of the housing to the cavity for allowing vapor to escape from the cavity.. . ... Littelfuse Inc

Strain-relieved fuse and method of forming a strain-relieved fuse

A fuse including a fuse body, a fuse element including a first terminal end extending from a first end of the fuse body, and a second terminal extending from a second end of the fuse body, wherein at least one of the first terminal end and the second terminal end extending out of the respective first and second ends of the fuse body include a strain relief feature, and wherein the strain relief feature is configured to flex in response to thermal fluctuation of the fuse or the surrounding components to which it is attached.. . ... Littelfuse Inc

Sealed fuse

A sealed fuse in accordance with the present disclosure may include a tubular fuse body, a trench formed in an exterior of the fuse body, and an electrically conductive endcap that fits over an end of the fuse body and is fastened to the fuse body by an electrically conductive material having a lip portion that extends into the trench to provide a barrier that extends between the fuse body and the endcap. In an embodiment, the trench may be formed in an end face of the fuse body and may extend entirely around an opening in the end of the fuse body. ... Littelfuse Inc

Surge protection device

A circuit protection device including a housing defining a chamber and a metal oxide varistor (mov) stack disposed within the chamber. A first spring is electrically attached at a first end to a first input terminal of the mov stack by a solder connection and at a second end to a first input line. ... Littelfuse Inc

Wireless communication enabled relay

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.. . ... Littelfuse Inc

Integrated rain and solar radiation sensing module

An integrated rain and solar radiation sensing module including at least two light emitting elements, a plurality of input lenses, wherein at least two of the plurality of input lenses are configured to receive and collimate light emitted by each of the light emitting elements, a plurality of output lenses numbering at least twice as many as the plurality of input lenses, wherein each output lens is configured to receive and focus light that is collimated by at least one of the plurality of input lenses and reflected off of a transparent substrate, and a plurality of light receiving elements, wherein each light receiving element configured to receive focused light from at least one of the output lenses and to convert the received light into an electrical output signal proportional to the received light.. . ... Littelfuse Inc

Fuses with integrated metals

Fuse assemblies are disclosed. In one implementation, a fuse assembly may be disposed that includes a first portion of the second portion. ... Littelfuse Inc

Sealed fuse

A sealed fuse in accordance with the present disclosure may include a tubular fuse body, a trench formed in an exterior of the fuse body, and an electrically conductive endcap that fits over an end of the fuse body and is fastened to the fuse body by an electrically conductive material having a lip portion that extends into the trench to provide a barrier that extends between the fuse body and the endcap. In an embodiment, the trench may be formed in an end face of the fuse body and may extend entirely around an opening in the end of the fuse body. ... Littelfuse Inc

Usb cable with thermal protection

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 predefine trip temperature.. . ... Littelfuse Inc

Protective element

The present invention relates to a protective element which comprises a layered ptc element having a first main surface and a second main surface, a first electrode that is positioned on the first main surface of the ptc element and a second electrode that is positioned on the second main surface of the ptc element, and the protective element characterized in that at least a portion of the first electrode and at least a portion of the second electrode are positioned so as to oppose each other with the ptc element being interposed therebetween, and a portion of the first main surface is exposed.. . ... Littelfuse Inc

Non-arcing fuse

An arc-mitigating fuse including a tubular fuse body, a first endcap covering a first end of the fuse body and a second endcap covering a second end of the fuse body, a fusible element disposed within the fuse body and extending between the first endcap and the second endcap to provide an electrically conductive pathway therebetween, and an arc-mitigating element disposed within the fuse body and held in a compressed state between the first endcap and the second endcap, the arc-mitigating element adapted to extend to an uncompressed state upon separation of the fusible element.. . ... Littelfuse Inc

Zero sequence sensing apparatus and method

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. ... Littelfuse Inc

Electromagnetic interference suppression device and method for manufacturing same

A method for manufacturing an emi suppression device includes formulating a dielectric material from a polymer composite material that includes a thermoplastic resin /thermosetting resin and a conductive filler. A sheet that comprises the polymer composite filler is prepared. ... Littelfuse Inc

Surge protection device

A circuit protection device includes a metal oxide varistor (mov), a spring terminal and a thermal disconnect coupling the spring terminal to the mov. A gas discharge tube (gdt) is coupled to the mov. ... Littelfuse Inc

03/01/18 / #20180061607

Fuse and method of forming a fuse

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. ... Littelfuse Inc

03/01/18 / #20180061534

Adhesive positive temperature coefficient material

Positive temperature coefficient (ptc) devices and methods to manufacture ptc devices are disclosed. A ptc device or apparatus may include a grafted polymer. ... Littelfuse Inc

02/15/18 / #20180047485

Flexible positive temperature coefficient device with battery management system

An electronic device including a protected component, a flexible positive temperature coefficient (ptc) device including a flexible sheet of ptc material coupled to a surface of the protected component, the flexible ptc device electrically connected to the protected component and adapted to arrest or mitigate electrical current flowing through the protected component upon the occurrence of an overcurrent condition, and a battery management system coupled to the flexible ptc device, the battery management system configured to measure a voltage across the flexible ptc device and to arrest or mitigate electrical current in the electronic device if the measured voltage across the flexible ptc device exceeds a predetermined threshold.. . ... Littelfuse Inc

02/01/18 / #20180033525

Methods for manufacturing an insulated busbar

A method for manufacturing an insulated conductive material, the method including providing a wire, applying a masking material to one or more regions of the wire, coating regions of the wire other than the one or more regions with an insulating material by, electrically charging the wire with a first charge polarity, providing a medium of electrically charged insulating material particles that are charged with an opposite polarity, passing the charged wire through the medium, whereby the insulating material particles bind areas of the conductive material other than the one or more regions, curing the insulating material particles, and applying a solvent to the masking material to thereby remove the masking material, wherein the cured insulated material particles are substantially unaffected by the solvent.. . ... Littelfuse Inc

01/11/18 / #20180012686

Flexible positive temperature coefficient sheet and method for making the same

A flexible sheet of positive temperature coefficient (ptc) material formed of a polymer resin and a conductive filler, the sheet of ptc material having a thickness in a range of 10 μm to 100 μm. A method for forming the flexible sheet of positive temperature coefficient material may include preparing a ptc ink from a polymer resin, a conductive filler, and a solvent, applying the ptc ink to a substrate, pulling a blade over the ptc ink to create a uniformly thick layer of the ptc ink on the substrate, and allowing the ptc ink to dry so that the solvent evaporates and leaves a solid layer of ptc material on the substrate.. ... Littelfuse Inc

12/28/17 / #20170373679

Igbt having improved clamp arrangement

In one embodiment, an insulated gate bipolar transistor (igbt) device may include an nmos portion and a pnp portion, where the pnp portion is coupled to the nmos portion. The pnp portion may include a base and a collector. ... Littelfuse Inc

12/28/17 / #20170373142

Semiconductor device having side-diffused trench plug

A semiconductor device structure may include a substrate having a substrate base comprising a first dopant type; a semiconductor layer disposed on a surface of the substrate base, the semiconductor layer comprising a second dopant type and having an upper surface; and a semiconductor plug assembly comprising a semiconductor plug disposed within the semiconductor layer, the semiconductor plug extending from an upper surface of the semiconductor layer and having a depth at least equal to a thickness of the semiconductor layer, the semiconductor plug having a first boundary, the first boundary formed within the semiconductor layer, and having a second boundary, the second boundary formed within the semiconductor layer and disposed opposite the first boundary, wherein the first boundary and second boundary extend perpendicularly to the surface of the substrate base.. . ... Littelfuse Inc

12/28/17 / #20170372862

Hollow fuse body with trench

Provided herein are protection devices, such as fuses, including a set of trenches or pockets for retention of solder therein. In some embodiments, a fuse includes a body including a center portion extending between a first and second end portions. ... Littelfuse Inc

12/14/17 / #20170358567

Transient suppressing circuit arrangements

Transient suppression circuit arrangements are disclosed. In one implementation of a transient suppression circuit, at least one avalanche diode is coupled in series with a diac, a silicon diode for alternating current (sidac) device or sidactor.. ... Littelfuse Inc

12/14/17 / #20170358417

Mechanical disconnect switch with integrated fuse protection

A circuit protection assembly (cpa) is disposed between a source of power and a circuit to be protected. The cpa comprises a mounting block having a bore extending therethrough and a recess cavity on a first surface of the mounting block. ... Littelfuse Inc

12/07/17 / #20170352514

Hollow fuse body with notched ends

Hollow bodies and hollow body fuses are disclosed. Furthermore, methods to provide hollow bodies and hollow body fuses are disclosed. ... Littelfuse Inc

11/30/17 / #20170345533

Structurally resilient positive temperature coefficient material and method for making same

Structurally supported positive temperature coefficient (ptc) materials are disclosed. Furthermore, methods to provide structurally supported ptc materials are disclosed. ... Littelfuse Inc

11/16/17 / #20170331310

Relay for use with multiple power sources

Provided herein is a relay architecture for selecting between multiple power sources. In one approach, a first relay and first power source are electrically coupled to a first terminal. ... Littelfuse Inc

10/12/17 / #20170294506

High voltage electronic device and method associated therewith

An electronic device including a substrate, a semiconductor element disposed on the substrate, and a plurality of guard rings at least partially surrounding the semiconductor element, wherein adjacent guard rings are spaced apart by a substantially uniform distance as measured along an entire length of the guard rings, and at least one of the plurality of guard rings has a flared portion. In an embodiment, at least one of the plurality of guard rings electrically floats. ... Littelfuse Inc

10/12/17 / #20170294251

Ultrathin positive temperature coefficient sheet and method for making same

A method for manufacturing a sheet of positive temperature coefficient (ptc) material includes providing a ptc material, grinding the ptc material into a powder, and inserting the ground ptc material into a press. The ground ptc material is compressed within the press until the ptc material defines a planar shape. ... Littelfuse Inc

09/28/17 / #20170279261

Multiple current sensor system

Provided herein are improved current monitoring systems for monitoring currents having large ranges. A current monitor can include two or more current sensors. ... Littelfuse Inc

09/28/17 / #20170279107

Electrode

The present invention provides an electrode for an electrical device, the electrode comprising: a ptc element; a first terminal disposed on one main surface of the ptc element and extending in one direction; and a second terminal disposed on the other main surface of the ptc element and extending in a different direction from the first terminal.. . ... Littelfuse Inc

09/28/17 / #20170278600

Ptc device and secondary battery having same

A ptc device as well as an electrical device such as a battery pack or a dry-cell type secondary cell containing a ptc device and a secondary cell is made more compact. The ptc device includes (1) a ptc component including a laminar polymer ptc element having an electrically conductive filler and a polymer material, and a metal electrode disposed on a surface of each side of the polymer ptc element; and (2) a lead positioned at least in part on the metal electrode of the ptc component, and connected to the metal electrode by an electrically conductive material an exposed part of the electrically conductive material is covered by a protective member including a polypropylene resin, a nylon resin or an epoxy resin.. ... Littelfuse Inc

09/28/17 / #20170276513

Magnetic sensor system

Provided herein are improved magnetic sensor systems for use in linear measurement systems. A magnetic sensor can be positioned offset from a center line positioned between two magnets. ... Littelfuse Inc

09/21/17 / #20170271862

Method and apparatus for protecting a polarity sensitive load

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. ... Littelfuse Inc

09/21/17 / #20170271824

Arc suppression connector

A circuit includes a connector having first and second mateable portions. Each portion includes at least two terminals configured to mechanically engage at least two terminals of the other portion. ... Littelfuse Inc

09/14/17 / #20170263407

High-current fuse with endbell assembly

A fuse includes a fuse element and a fuse body. A portion of the fuse element is housed in a fuse body. ... Littelfuse Inc

08/24/17 / #20170244201

Protection element

The present invention provides a protective element including (i) a ptc element having an opening passing through in the thickness direction, and (ii) a first electrode and a second electrode positioned on both main surfaces of the ptc element, the protective element characterized in that the first electrode extends from a main surface of the ptc element over an edge thereof and into the opening. A protective element of the present invention does not prevent the ptc element from expanding even when secured by a screw or caulking.. ... Littelfuse Inc

08/17/17 / #20170236675

High current one-piece fuse element and split body

A compact, high breaking capacity fuse that includes a top and bottom insulative layer and a single piece fusible element disposed between the top and bottom insulative layer. The top and bottom insulative layers include cavities that are aligned at assembly to form a chamber in which a fusible element portion of the single piece fusible element is disposed. ... Littelfuse Inc

08/03/17 / #20170221613

Varistor having multilayer coating and fabrication method

In one embodiment a varistor may include a ceramic body. The varistor may further comprise a multilayer coating disposed around the ceramic body. ... Littelfuse Inc

08/03/17 / #20170221612

Varistor having multilayer coating and fabrication method

In one embodiment a varistor may include a ceramic body. The varistor may further comprise a multilayer coating disposed around the ceramic body. ... Littelfuse Inc

07/27/17 / #20170213682

Surface mounted protection device

Approaches herein provided surface mounted devices each configured as a stand-alone component suitable for attachment to a substrate such as a printed circuit board (pcb). In some embodiments, a method includes forming a base housing, coupling an electronic component to the base housing, and forming a cover over the electronic component, wherein the cover is coupled to the base housing. ... Littelfuse Inc

06/01/17 / #20170154748

Low-current fuse stamping method

A convenient, cost-effective method for manufacturing low-current fuse elements. The method may include the steps of stamping a substrate out of a sheet of material and stamping at least one hole in the substrate. ... Littelfuse Inc

05/18/17 / #20170138766

Detecting movement of a seatbelt sensor

Provided herein are approaches for detecting movement of a seatbelt sensor. In some approaches, a detector includes a sensor housing coupled to a plate of a vehicle restraint system, and a sensor disposed within the sensor housing, wherein the sensor is operable to sense a position of a magnet in proximity to the sensor. ... Littelfuse Inc

04/27/17 / #20170117778

Electromagnetic interference suppression component and protection component assembly for a motor

An electromagnetic interference (emi) circuit assembly includes a first, second, and third conductive layer. A protection component disposed between the first and second conductive layers. ... Littelfuse Inc

04/20/17 / #20170110279

Thermal metal oxide varistor circuit protection device

Exemplary embodiments of the present invention are directed to a circuit protection device, a circuit protection device may comprise a housing defining a cavity and a metal oxide varistor (mov) disposed within the cavity. The circuit protection device may further comprise a first terminal electrically attached at a first end to the mov by solder and extending outside of the housing at a second end. ... Littelfuse Inc

04/13/17 / #20170103831

Methods for manufacturing an insulated busbar

A method for manufacturing an insulated conductive material includes providing a continuous feed of a conductive material, a first continuous feed of insulating material above a top surface of the conductive strip, and a second continuous feed of insulating material below a bottom surface of the conductive strip. Portions of the first and second continuous feeds of insulating material are compressed against a portion of the conductive material. ... Littelfuse Inc

04/06/17 / #20170098523

Sealed modular power distribution apparatus

Provided are approaches for modularized power distribution. In one approach, an apparatus may include a module extending into an interior cavity of a housing assembly through an opening formed in a base section of the housing assembly. ... Littelfuse Inc

03/16/17 / #20170076900

Protective device

The present invention proposes a protection device which has a large rated voltage and a large rated current, which is capable of sufficiently suppressing arc generation during activation, and which is also capable of providing suitable protection against overcurrent due to short circuiting or the like of a main circuit. The protection device of the present invention includes (i) a protection element which includes a first thermal fuse and a resistor, and in which the resistor generates heat as a result of current passing through the resistor when there are abnormalities, and the first thermal fuse is activated due to this heat and interrupts the current, (ii) a ptc element and a second thermal fuse which are electrically connected in parallel to the first thermal fuse and which are electrically connected in series to each other, and (iii) a current fuse which is electrically connected in series to the first thermal fuse.. ... Littelfuse Inc

03/09/17 / #20170070041

Power distribution housing

A power distribution housing including a base, a cover adapted to fit onto the base, a latch member adapted to removably secure the cover to the base, the latch member having a first end pivotably connected to the base and a second end having a latch detent extending therefrom, the latch detent configured to engage a catch in the cover when the latch member is pivoted to a latched position wherein the cover is secured to the base by the latch member, and a locking member coupled to the latch member, the locking member movable between a locked position, in which a locking member extension of the locking member engages a locking member recess in the cover and prevents the latch member from being moved from the latched position to an unlatched position, and an unlocked position in which the locking member extension does not engage the locking member recess.. . ... Littelfuse Inc

02/09/17 / #20170040134

Fuse with insulated plugs

An improved fuse including a fuse body formed of an electrically insulative material. The fuse body defines a cavity which extends from a first end of the fuse body to a second end of the fuse body. ... Littelfuse Inc

01/19/17 / #20170018917

Apparatus for detecting arc flash

An apparatus may include a sensor housing, a light sensor disposed within the sensor housing, the light sensor arranged to generate a detection signal when light impinges on the light sensor, a sensor lens disposed at least partially outside the sensor housing, wherein a distal portion of the sensor lens extends a first distance above the sensor housing, the sensor lens being transparent, wherein light received from outside the sensor housing is transmitted to the light sensor; and a light emitter assembly disposed outside the sensor housing at a second distance above the housing less than the first distance.. . ... Littelfuse Inc

01/19/17 / #20170018389

Circuit protection assembly

A circuit protection assembly can include a conductive assembly post that supports a first conductive element, a non-conductive isolator, a second conductive element, a fuse, and a fastener. The first and second conductive elements can be positioned in close proximity to one another below the fuse. ... Littelfuse Inc








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