Abstract: The present invention provides a protection device which includes: a PTC laminar element which is formed of an insulation resin and has at least one throughhole; electrically conductive metal thin layers which are positioned on each of main surfaces of the laminar element, and a fuse layer which is positioned on a side surface defining at least one of said at least one throughhole and electrically connects the electrically conductive metal thin layers which are positioned on each of main surfaces of the laminar element. The protection device of the present invention allows a larger amount of a current to flow therethrough and can provide a protection from an excessive current.

Abstract: The present invention provides a protection device which includes: a PTC laminar element which is formed of an insulation resin and has at least one throughhole; electrically conductive metal thin layers which are positioned on each of main surfaces of the laminar element, and a fuse layer which is positioned on a side surface defining at least one of said at least one throughhole and electrically connects the electrically conductive metal thin layers which are positioned on each of main surfaces of the laminar element. The protection device of the present invention allows a larger amount of a current to flow therethrough and can provide a protection from an excessive current.

Abstract: In a distortion compensation apparatus, a monitor unit monitors a power value of a transmission baseband signal. An update control unit does not allow an updating unit to execute update processing when the power value monitored by the monitor unit is lower than a first threshold, and causes the updating unit to execute the update processing when higher than the first threshold. That is, the update control unit controls execution/non-execution of the update processing by the updating unit based on the monitored power value.

Abstract: The present invention provides a PTC device having a laminate which includes a PTC component having a laminar PTC element defined by main surfaces which are facing each other, laminar electrodes extending on the main surfaces, and a first insulation layer, the PTC component, and a second insulation layer laminated in this listed order. The laminate has a first end and a second end, and a first side electrode and a second side electrode are disposed on the first end and the second end, respectively; one of laminar electrodes of the PTC component extends while being separated from the first side electrode and the second side electrode; the other is separated from the first end, and extends to the second end and is electrically connected to the second side electrode.

Abstract: The present invention provides a PTC device having a laminate which includes a PTC component having a laminar PTC element defined by main surfaces which are facing each other, laminar electrodes extending on the main surfaces, and a first insulation layer, the PTC component, and a second insulation layer laminated in this listed order. The laminate has a first end and a second end, and a first side electrode and a second side electrode are disposed on the first end and the second end, respectively; one of laminar electrodes of the PTC component extends while being separated from the first side electrode and the second side electrode; the other is separated from the first end, and extends to the second end and is electrically connected to the second side electrode.

Abstract: An electrical leak detecting apparatus for detecting electrical leak of a power supply device includes two voltage division elements which have an identical impedance value and are connected to each other in series between input terminals or output terminals of a DC/AC conversion circuit of the power supply device, a detection element which has one end connected to a junction of the voltage division elements, a capacitor which is inserted between the other end of the detection element and ground and a decision member which receives a voltage drop across the detection element as a detection signal and processes the detection signal so as to judge occurrence of the electrical leak.

Abstract: An electrical leak detecting apparatus for detecting electrical leak of a power supply device includes two voltage division elements which have an identical impedance value and are connected to each other in series between input terminals or output terminals of a DC/AC conversion circuit of the power supply device, a detection element which has one end connected to a junction of the voltage division elements, a capacitor which is inserted between the other end of the detection element and ground and a decision member which receives a voltage drop across the detection element as a detection signal and processes the detection signal so as to judge occurrence of the electrical leak.