摘要:
A heat dissipation substrate for an electronic device comprises a first metal layer, a second metal layer, and a thermally conductive polymer dielectric insulating layer. A surface of the first metal layer carries the electronic device, e.g., a light-emitting diode (LED) device. The thermally conductive polymer dielectric insulating layer is stacked between the first metal layer and the second metal layer in a physical contact manner, and interfaces therebetween include at least one micro-rough surface with a roughness Rz larger than 7.0. The micro-rough surface includes a plurality of nodular projections, and the grain sizes of the nodular projections mainly are in a range of 0.1-100 μm. The heat dissipation substrate has a thermal conductivity larger than 1.0 W/m·K, and a thickness smaller than 0.5 mm, and comprises (1) a fluorine-containing polymer with a melting point higher than 150° C. and a volume percentage in a range of 30-60%, and (2) thermally conductive filler dispersed in the fluorine-containing polymer and having a volume percentage in a range of 40-70%.
摘要:
A heat-conductive dielectric polymer material having an inter-penetrating-network (IPN) structure includes a polymer component, a curing agent, and a heat-conductive filler uniformly dispersed in the polymer component. The polymer component includes a thermoplastic plastic and a thermosetting epoxy resin. The curing agent is used to cure the thermosetting epoxy resin at a curing temperature. The heat conductivity of the heat-conductive dielectric polymer material is larger than 0.5 W/mK. A heat dissipation substrate including the heat-conductive dielectric polymer material in the present invention has a thickness of less than 0.5 mm and bears a voltage of over 1000 volts.
摘要:
A heat-conductive dielectric polymer material having an inter-penetrating-network (IPN) structure includes a polymer component, a curing agent, and a heat-conductive filler uniformly dispersed in the polymer component. The polymer component includes a thermoplastic plastic and a thermosetting epoxy resin. The curing agent is used to cure the thermosetting epoxy resin at a curing temperature. The heat conductivity of the heat-conductive dielectric polymer material is larger than 0.5 W/mK. A heat dissipation substrate including the heat-conductive dielectric polymer material in the present invention has a thickness of less than 0.5 mm and bears a voltage of over 1000 volts.
摘要:
A surface-mountable over-current protection device comprises a PTC material layer, first and second conductive layers, first and second electrodes, first and second electrically conductive connecting members. The PTC material layer has a resistivity less than 0.18 Ω-cm. The conductive layers are in contact with opposite surfaces of the PTC material layer. The first electrode comprises pair of first metal foils and is insulated from the second conductive layer. The second electrode comprises a pair of second metal foils and is insulated from the first conductive layer. The first electrically conductive connecting member connects to the first metal foils and conductive layer. The second electrically conductive connecting member connects to the second metal foils and conductive layer. The first electrically conductive connecting member comprises 40%-100% by area of the first lateral surface, and the second electrically conductive connecting member comprises 40%-100% by area of the second lateral surface.
摘要:
An over-current protection device includes a conductive composite having a first crystalline fluorinated polymer, a plurality of particulates, a conductive filler, and a non-conductive filler, wherein the plurality of particulates include a second crystalline fluorinated polymer. The first crystalline fluorinated polymer has a crystalline melting temperature of between 150 and 190 degrees Celsius. The plurality of particulates including the second crystalline fluorinated polymer are disposed in the conductive composite, having a crystalline melting temperature of between 320 and 390 degrees Celsius and having a particulate diameter of from 1 to 50 micrometers. The conductive filler and the non-conductive filler are dispersed in the conductive composite.
摘要:
An over-current protection device includes a conductive composite having a first crystalline fluorinated polymer, a plurality of particulates, a conductive filler, and a non-conductive filler, wherein the plurality of particulates include a second crystalline fluorinated polymer. The first crystalline fluorinated polymer has a crystalline melting temperature of between 150 and 190 degrees Celsius. The plurality of particulates including the second crystalline fluorinated polymer are disposed in the conductive composite, having a crystalline melting temperature of between 320 and 390 degrees Celsius and having a particulate diameter of from 1 to 50 micrometers. The conductive filler and the non-conductive filler are dispersed in the conductive composite.
摘要:
An over-current protection device is disposed on a circuit board and configured to protect a battery. The over-current protection device includes a resistive device, at least one insulation layer and a weld electrode layer. The resistive device exhibits positive temperature coefficient behavior. The insulation layer has a thickness of at least 0.03 mm. The weld electrode layer is configured to weld a strip interconnect member to electrically coupled to the battery, and has a thickness of at least 0.03 mm. The insulation layer and the resistive device are disposed between the weld electrode layer and the circuit board. The circuit board, the resistive device and the weld electrode layer are electrically coupled in series. The association of the resistive device and the weld electrode layer has a thermal mass capable of withstanding welding the strip interconnect member without significant damage to the over-current protection device.
摘要:
A radial-leaded over-current protection device includes a PTC device, first and second electrode leads and an insulating encapsulation layer. The PTC device has first and a second conductive layers and a PTC material layer therebetween. The PTC material layer has a resistivity less than 0.18 Ω-cm and includes crystalline polymer and conductive ceramic filler. The ceramic filler has a resistivity less than 500 Ω-cm and is 35-65% by volume of the PTC material layer. The first electrode lead has an end connecting to the first conductive layer, whereas the second electrode lead has an end connecting to the second conductive layer. The insulating encapsulation layer wraps the PTC device and the ends of the conductive layers. The radial-leaded over-current protection device at 25° C. has a value of hold current thereof divided by an area of the PTC device ranging from 0.027-0.3A/mm2. Each electrode lead has a cross-sectional area of at least 0.16 mm2.
摘要:
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.
摘要:
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.