Littelfuse, Inc.

Dongguan Littelfuse Electronics Company Limited

Littelfuse Electronics (shanghai) Co., Ltd.

Chun-Kwan Tsang

Jianhua Chen

Yi-hua Deng

Martin G Pineda

Werner Johler

Edward W Rutter, Jr

Zhiyong Zhou

Sergio Fuentes

Todd Dietsch

Yingsong Fu

A novel polymer positive temperature coefficient (PPTC) material, device, and method of fabrication. One example of polymer positive temperature coefficient (PPTC) includes a polymer matrix, the polymer matrix comprising a first polymer. The PPTC material may further include a conductive filler, disposed in the polymer matrix; and at least one polymer filler, dispersed within the polymer matrix. The at least one polymer filler may comprise a second polymer, different from the first polymer, wherein the at least one polymer comprises a first melting temperature, and wherein the second polymer comprises a second melting temperature, the second melting temperature exceeding the first melting temperature by at least 20 C.

PPTC composition and device having low thermal derating and low process jump

The present invention relates to a polymer voltage-dependent resistor (PVDR) in various physical forms and methods for manufacturing the varistor. The body of the PVDR is composed of a polymer matrix having a filler composed of doped zinc oxide particles, other semi conductive particles or metal particles uniformly distributed therein. Conductive electrodes may be affixed to the polymer matrix and electrical leads attached to the electrodes.

Polymer voltage-dependent resistor

A fuse device including a fuse component, a first electrode, disposed on a first side of the fuse component, a second electrode, disposed on a second side of the fuse component, and a phase change component, disposed in thermal contact with the fuse component. The fuse component may comprise a fuse temperature, wherein the phase change component exhibits a phase change temperature, the phase change temperature marking a phase transition of the phase change component, and wherein the phase change temperature is less than the fuse temperature.

Method of forming a fuse device

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.

Overcurrent protection device and method of forming an overcurrent protection device

A polymer positive temperature coefficient (PPTC) material. The PPTC material may include a polymer matrix, a conductive filler, and a thermal stabilizer.

PPTC composition and device having thermal degradation resistance

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.

Methods for manufacturing an insulated busbar

Fuse device having phase change material

A hybrid device, comprising: a first electrode, disposed on a first side of the hybrid device, a second electrode, disposed on a second side of the hybrid device, opposite the first side. The hybrid device may further include at least one layer, disposed between the first electrode and the second electrode, the at least one layer comprising a negative temperature coefficient material and a plurality of conductive particles, wherein the hybrid device exhibits a positive temperature coefficient characteristic and a negative temperature coefficient characteristic.

Hybrid device structures including negative temperature coefficient/positive temperature coefficient device

Structurally supported positive temperature coefficient (PTC) materials are disclosed. Furthermore, methods to provide structurally supported PTC materials are disclosed. In one implementation, a structurally supported PTC material includes a support structure that is at least partially covered by a PTC material. In one example, the support structure is a mesh material integrated at least partially in the PTC material.

Growing community of inventors

Morgan Hill, CA, United States of America

Chun-Kwan Tsang