Polytronics Technology Corp.

An over-current protection device includes an electrode layer and a heat-sensitive layer. The electrode layer has a top metal layer and a bottom metal layer, and the heat-sensitive layer is laminated between them. The heat-sensitive layer exhibits a positive temperature coefficient (PTC) characteristic and includes a polymer matrix and a conductive filler. The conductive filler includes a metal compound dispersed in the polymer matrix, thereby forming an electrically conductive path in the heat-sensitive layer. The metal compound consists of a metal carbide and unavoidable impurities. The total amount of the metal carbide and unavoidable impurities is taken as 100%, and the metal carbide accounts for at least 90%.

An over-current protection device includes first and second electrode layers and a PTC material layer laminated therebetween. The PTC material layer includes a polymer matrix, and a conductive filler. The polymer matrix has a fluoropolymer. The total volume of the PTC material layer is calculated as 100%, and the fluoropolymer accounts for 47-62% by volume of the PTC material layer. The fluoropolymer has a melt viscosity higher than 3000 Pa·s.

A protection device includes a substrate, a heater, and a meltable member. The heater includes a first heating element and a second heating element, disposed on the top surface and the bottom surface of the substrate, respectively. If a surface area of the substrate is taken as 100%, the sum of surface areas of the first and second heating elements accounts for 18% to 72%. The meltable member is disposed above the first heating element, by which the meltable member is heated up in the event of over-voltage.

A thermal interface material includes a thermally melting material and an inner filler. The thermally melting material includes an olefin-acrylate copolymer having a melt flow index higher than 110 g/10 min. The inner filler has a plurality of thermally conductive fillers and a highly dispersible filler. The total volume of the thermal interface material is calculated as 100%, with the olefin-acrylate copolymer accounting for 25% to 35%, and the thermally conductive fillers and the highly dispersible filler accounting for 65% to 75%.

An over-current protection device includes a first metal layer, a second metal layer and a heat-sensitive layer laminated therebetween. The heat-sensitive layer exhibits a positive temperature coefficient (PTC) characteristic and includes a polymer matrix and a first conductive filler. The polymer matrix includes a polyolefin-based polymer and a fluoropolymer. The fluoropolymer has a melt flow index higher than 1.9 g/10 min, and the polyolefin-based polymer and the fluoropolymer together form an interpenetrating polymer network (IPN). The first conductive filler has a metal-ceramic compound dispersed in the polymer matrix.

A protection device includes a meltable member, an electrode set, and a heating element. The meltable member has a core metal layer and a bottom metal layer disposed therebelow, and a melting point of the bottom metal layer is lower than that of the core metal layer. The electrode set has a first electrode, a second electrode, and an auxiliary electrode. The auxiliary electrode is located between the first electrode and the second electrode, and is disposed under the meltable member, thereby contacting the bottom metal layer. The meltable member has a hollow part penetrating the core metal layer, by which the bottom metal layer on the auxiliary electrode is exposed. The heating element is disposed under the auxiliary electrode, thereby heating up and blowing the meltable member in the event of over-voltage.

A circuit protection device includes a temperature sensitive resistor element, a dielectric layer, a first electrically insulating layer, a first electrode and a second electrode. The temperature sensitive resistor element has a first electrically conductive layer, a second electrically conductive layer and a positive temperature coefficient (PTC) layer disposed therebetween. The first electrically conductive layer has two electrically conductive blocks. The two electrically conductive blocks dispose on the surface of the PTC layer, thus forming a trench in the PTC layer. The dielectric layer is disposed in the trench. The first electrically insulating layer is disposed on the first electrically conductive layer and covers the dielectric layer. The first and second electrodes are disposed on the first electrically insulating layer, and electrically connected to the two electrically conductive blocks, respectively.

A circuit protection device includes a first temperature sensitive resistor, a second temperature sensitive resistor, an electrically insulating multilayer, a first and second electrode layer, and at least one external electrode. The first temperature sensitive resistor and the second temperature sensitive resistor are electrically connected in parallel, and have a first upper electrically conductive layer and a second lower electrically conductive layer, respectively. The electrically insulating multilayer includes an upper insulating layer, a middle insulating layer, and a lower insulating layer. The upper insulating layer is between the first upper electrically conductive layer and the first electrode layer. The middle layer is laminated between the first temperature sensitive resistor and the second temperature sensitive resistor. The lower insulating layer is between the second lower electrically conductive layer and the second electrode layer. The external electrode is disposed on the first electrode layer, and extends beyond a peripheral wall along a horizontal direction.

An over-current protection device comprises first and second electrode layers and a PTC material layer laminated therebetween. The PTC material layer includes a polymer matrix, a conductive filler and a titanium-containing inner filler. The polymer matrix has a fluorine-free polyolefin-based polymer. The titanium-containing inner filler has a compound represented by a general formula of MTiO 3 , wherein the M represents transition metal or alkaline earth metal. The total volume of the PTC material layer is calculated as 100%, and the titanium-containing inner filler accounts for 1-9% by volume of the PTC material layer.

A thermally conductive device includes an electrically insulating but thermally conductive layer, a first thermally conductive lead frame, and a second thermally conductive lead frame. The electrically insulating but thermally conductive layer has a top surface, a bottom surface, and a sidewall therebetween. The first thermally conductive lead frame has a top metal plate, a first extending part, and a second extending part. The top metal plate is disposed on the top surface. The first extending part horizontally extends from the top metal plate and goes beyond the sidewall. The second extending part extends from the first extending part and goes beyond the bottom surface. The second thermally conductive lead frame has a bottom metal plate and a third extending part. The bottom metal plate is disposed on the bottom surface. The third extending part extends downward from the bottom metal plate.