Provided is a compact secondary coil module that can be easily mounted in a terminal device side unit. The secondary coil module whose power for use in charging a storage battery by a contactless charging technique is supplied via a primary coil, includes the storage battery, a charging control circuit controlling charging of the storage battery, a tubular core made of magnetic material and covering an outer circumferential face of at least one of the storage battery and the charging control circuit, and a wire made of conductive material, the wire being connected to the charging control circuit and wound around the outer circumferential face of the core.

An electronic apparatus includes a power receiving unit that receives power from a power transmitting apparatus wirelessly, a connection unit that connects an external apparatus, a detection unit that detects power received by the power receiving unit, and a control unit that changes a mode of the electronic apparatus to a first mode after the detection unit detects that power received by the power receiving unit is equal to or lower than a predetermined value if the electronic apparatus is in a second mode.

A wireless power transmission device is disclosed. The wireless power transmission device comprises a first coil and a second coil electromagnetically coupled to the first coil without contacting the first coil. A portion of one of the first coil and the second coil extends through a space defined by the other of the first coil and the second coil.

An automated charging device detects a presence of a power-consuming device. The automated charging device may determine whether the power-consuming device is in need of recharging by determining a status of a power level of the power-consuming device. In response to determining that the power-consuming device is due for recharging, the automated charging device may direct a wireless power source to the power-consuming device without user intervention and/or instruction. The automated charging device may detect a location of the power-consuming device and use the detected location to appropriately direct the wireless power source to the power-consuming device.

An impulse voltage generating device includes: an insulation cylinder; a DC power source positioned outside the insulation cylinder; capacitors arranged successively and connected to the DC power source in parallel, the capacitors being provided in a plurality of stages, the capacitors being accommodated in metal containers positioned outside the insulation cylinder; a discharging gap switch positioned in the insulation cylinder and provided between the stages; a blower structure configured to cause an insulation gas to flow in the insulation cylinder; a bushing for each of the capacitors, the bushing being positioned outside the insulation cylinder; and a gas spraying structure positioned outside the insulation cylinder, the gas spraying structure being configured to spray the insulation gas to the bushing.

An impulse voltage generating device includes: an insulation cylinder; a DC power source positioned outside the insulation cylinder; capacitors arranged successively and connected to the DC power source in parallel, the capacitors being provided in a plurality of stages, the capacitors being accommodated in metal containers positioned outside the insulation cylinder; a discharging gap switch positioned in the insulation cylinder and provided between the stages; a blower structure configured to cause an insulation gas to flow in the insulation cylinder; a bushing for each of the capacitors, the bushing being positioned outside the insulation cylinder; and a gas spraying structure positioned outside the insulation cylinder, the gas spraying structure being configured to spray the insulation gas to the bushing.