Abstract: A surface-mounted over-current protection device with positive temperature coefficient (PTC) behavior is disclosed. The surface-mounted over-current protection device comprises a first metal foil, a second metal foil corresponding to the first metal foil, a PTC material layer stacked between the first metal foil and the second metal foil, a first metal electrode, a first metal conductor electrically connecting the first metal foil to the first metal electrode, a second metal electrode corresponding to the first metal electrode, a second metal conductor electrically connecting the second metal foil to the second metal electrode, and at least one insulated layer to electrically insulate the first metal electrode from the second metal electrode. The surface-mounted over-current protection device, at 25° C., indicates that a hold current thereof divided by the product of a covered area thereof and the number of the conductive composite module is at least 0.16 A/mm2.

Abstract: An LED apparatus with temperature self-regulating, over-temperature protection, and over-current protection function comprises an LED chip, a heat dissipation plate, a heat conductive layer and a temperature control device. The heat dissipation and the heat conductive layer disposed thereon carry the LED chip and dissipate the heat generated from the LED chip that is connected to an electric power source for luminance. The temperature control device exhibiting PTC behavior is electrically connected between the LED chip and the electric power source in series, and the distance between the LED chip and the temperature control device is less than 3 cm. The heat conductive layer can consist of polymeric dielectric material and has a heat conduction coefficient larger than 1.0 W/mK at 25° C.

Abstract: An over-current protection device comprises a chemically cross-linked positive temperature coefficient (PTC) layer and two electrode foils that can be connected to a power source to allow current to flow through the chemically cross-linked polymeric PTC layer. The chemically cross-linked polymeric PTC layer comprises at least two different PTC polymer layers, and each polymer layer comprises polymer and conductive filler and has a volumetric resistivity between 10?1 and 10?3 ?-cm. The polymer layers have different functional groups and are alternately stacked and hot pressed to generate chemical cross-linking therebetween so as to form the chemically cross-linked polymeric PTC layer, wherein the potential difference of every 0.1 mm in thickness of the chemically cross-linked polymeric PTC layer is less than 30 volts.

Abstract: An over-current protection device comprises two metal foils and a positive temperature coefficient (PTC) material layer. The PTC material layer is sandwiched between the two metal foils and comprises plural crystalline polymers with at least one polymer melting point below 115° C., and a non-oxide electrically conductive ceramic powder. The non-oxide electrically conductive ceramic powder exhibits a certain particle size distribution. The PTC material layer has a resistivity below 0.1 ?-cm. The initial resistance of the device is below 20 m?, and the area of the PTC material layer is below 30 mm2. The over-current protection device exhibits a surface temperature below 100° C. under the trip state of over-current protection.

Abstract: The present invention is to provide a high voltage over-current protection device and a manufacturing method thereof, in which PTC polymers are cross-linked by chemical cross-linking. With the method of the present invention, the high voltage endurance of the PTC devices is enhanced. In addition, the internal stress and degradation of polymers caused by irradiation treatment are prevented.

Abstract: The present invention discloses an over-current protection device comprising two metal foils and a positive temperature coefficient (PTC) material layer. The PTC material layer is sandwiched between the two metal foils and contains at least one crystalline polymer, a non-oxide electrically conductive ceramic powder and a non-conductive filler. The non-oxide electrically conductive ceramic powder exhibits a certain particle size distribution. The PTC material layer presents resistivity below 0.1 ?-cm.

Abstract: An over-current protection device comprises two electrode foils, at least one conductive layer and a positive temperature coefficient (PTC) layer, wherein at least one of the electrode foils comprises a micro-rough surface, and the micro-rough surface of the electrode foil is overlaid by the conductive layer. The PTC layer is stacked between the two electrode foils, and at least one of the surfaces of the PTC layer is physically in contact with the at least one conductive layer. Accordingly, the conductive layer located between the PTC layer and the electrode foil can effectively decrease the contact resistance therebetween and avoid arcing.

Abstract: An over-current protection device of a positive temperature coefficient (PTC) and a conductive polymer thereof are disclosed, which have a superior capability to withstand rigorous environments. The conductive polymer comprises a non-fluorine polyalkene matrix, a conductive filler and a fluorine polymer (e.g., PVDF), wherein the ratio of the fluorine polymer is 1-20% by weight. Laminating a PTC material layer composed of the above-mentioned conductive polymer between a first electrode layer and a second electrode layer forms the over-current protection device of the present invention.

Abstract: An axial leaded over-current protection device comprised of a plurality of PTC devices, a first terminal metal strip, and a second terminal metal strip. One end of the first terminal metal strip diverges into a plurality of electrode strips, and the plurality electrode strips are connected to an electrode layer of each PTC device. The second terminal metal strip is connected to the other electrode layer of each PTC device, i.e., the one not being connected to the first terminal metal strip. Accordingly, the first terminal metal strip and second terminal metal strip are respectively connected to the two electrode layers of each PTC device and become in parallel thereby, so that the resistance of the over-current protection device can be decreased.

Abstract: An over-current protection device comprises two electrode foils, at least one conductive layer and a positive temperature coefficient (PTC) layer, wherein at least one of the electrode foils comprises a micro-rough surface, and the micro-rough surface of the electrode foil is overlaid by the conductive layer. The PTC layer is stacked between the two electrode foils, and at least one of the surfaces of the PTC layer is physically in contact with the at least one conductive layer. Accordingly, the conductive layer located between the PTC layer and the electrode foil can effectively decrease the contact resistance therebetween and avoid arcing.