Abstract: An over-current protection device includes a heat-sensitive layer and an electrode layer. The electrode layer includes a top metal layer and a bottom metal layer, and the heat-sensitive layer attached therebetween. The heat-sensitive layer exhibits a positive temperature coefficient (PTC) characteristic and includes a polymer matrix and a conductive filler. The polymer matrix includes a polyolefin-based homopolymer and a polyolefin-based copolymer. The polyolefin-based homopolymer has a first coefficient of thermal expansion (CTE), and the polyolefin-based copolymer has a second CTE lower than the first CTE. The polyolefin-based homopolymer and the polyolefin-based copolymer together form an interpenetrating polymer network (IPN).

Abstract: 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, a conductive filler, and a titanium-containing dielectric filler. The polymer matrix has a fluoropolymer. The titanium-containing dielectric filler has a compound represented by a general formula of MTiO3, 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 dielectric filler accounts to for 5-15% by volume of the PTC material layer.

Abstract: 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.

Abstract: 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.

Abstract: 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 first polymer and a conductive filler. The first polymer consists of polyvinylidene difluoride (PVDF), and PVDF exists in different phases such as ?-PVDF, ?-PVDF and ?-PVDF. The total amount of ?-PVDF, ?-PVDF and ?-PVDF is calculated as 100%, and the amount of ?-PVDF accounts for 48% to 55%. The conductive filler has a metal-ceramic compound.

Abstract: 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 first polymer and a conductive filler. The first polymer consists of polyvinylidene difluoride (PVDF), and PVDF exists in different phases such as ?-PVDF, ?-PVDF and ?-PVDF. The total amount of ?-PVDF, ?-PVDF and ?-PVDF is calculated as 100%, and the amount of ?-PVDF accounts for 33% to 42%.

Abstract: An electronic device includes a current detection module, two path switches, a processing unit, and two control circuits. Two terminals of the current detection module are connected to an external power port and a battery. The two path switches are connected to the two terminals. A first control circuit is connected to the processing unit and to one path switch. A second control circuit is connected to the processing unit and to another path switch. When the electronic device is powered on, whether using power from the battery or from the external power port, the device can analyze the power consumed by the functioning parts of the device, including (when power is taken from the external power port) the amount of current taken in charging the battery.

Abstract: An electronic device includes a current detection module, two path switches, a processing unit, and two control circuits. Two terminals of the current detection module are connected to an external power port and a battery. The two path switches are connected to the two terminals. A first control circuit is connected to the processing unit and to one path switch. A second control circuit is connected to the processing unit and to another path switch. When the electronic device is powered on, whether using power from the battery or from the external power port, the device can analyze the power consumed by the functioning parts of the device, including (when power is taken from the external power port) the amount of current taken in charging the battery.

Abstract: A mobile phone includes two different communication systems and a current table storing relationship between signal transmission power and current in relation to the two different communication systems. The mobile phone obtains two received signal strength indications (RSSI) in relation to the two different communication systems if the mobile phone requires the voice call service, and then calculates two signal transmission power in relation to the two communication system according to the two RSSI. The mobile phone searches a current table to obtain two current according to the two signal transmission power. The mobile phone compares the two current to select one of the two communication systems which needs a smaller one of the two current to provide the voice call service.

Abstract: A data card includes a main chip, a switch, and an input/output interface. The input/output interface receives a voltage signal and a control signal, and transmits the voltage signal and the control signal to the switch. When the control signal is a first control signal, the switch switches on, and the voltage signal is transmitted to the main chip via the switch, causing the main chip to enable a universal serial bus (USB) function of the data card. When the control signal is a second signal, the switch switches off, and no voltage signal is supplied to the main chip, causing the main chip to disable the USB function.

Abstract: An automatically notifying system for testing a cellular phone module is provided. The system includes a control computer having a testing program for providing a test request, a testing device electrically connected with the control computer and the cellular phone module for testing the cellular phone module in response to the test request, and sending a test status back to the control computer, such that the testing program generates a trigger signal in response to the test status, and a control module electrically connected with the control computer for sending a warning message to a communication group in response to the trigger signal.