An inductor component having an element body includes two end surfaces opposite to each other and a bottom surface connected between the two end surfaces. A coil is provided in the element body and wound helically. Two external electrodes are provided in the element body and electrically connected to the coil. One of the external electrodes is formed over one of the end surfaces and the bottom surface while the other external electrode is formed over the other of the end surfaces and the bottom surface. The coil is formed such that an axial direction thereof is along the two end surfaces and the bottom surface. The coil includes a coil wiring wound along a plane orthogonal to the axial direction, and the aspect ratio of the coil wiring is 1.0 or more and less than 8.0.

A common mode choke coil according to one embodiment of the present invention includes a first coil conductor, a second coil conductor, and a third coil conductor. In the embodiment, the second coil conductor has a different shape than the first coil conductor and the third coil conductor. In the embodiment, the first coil conductor, the second coil conductor, and the third coil conductor extend parallel with each other in a first region in plan view as seen from an axial direction along the coil axis. In the embodiment, in the first region, when seen in a cross section cut along a plane including the coil axis, in an n-th turn, an arranging order of the first coil conductor, the second coil conductor, and the third coil conductor from an inner side in a radial direction thereof is inverted from that in an n+1th turn.

A circulating-current reducing circuit is provided that can suppress a circulating current with a simplified configuration having no control circuit. The circulating-current reducing circuit is connected to a transformer unit to reduce circulating current. The transformer unit includes: a first transformer device; a second transformer device that is connected to the first transformer device in parallel; and a switching element that controls timing of supply of current to a primary coil portion of the first transformer device and a primary coil portion of the second transformer device. The circulating-current reducing circuit includes a first circuit that is connected between the primary coil portion of the first transformer device and the switching element, and a second circuit that is connected between the primary coil portion of the second transformer device and the switching element.

A common mode choke coil according to one embodiment of the present invention includes a first coil conductor, a second coil conductor, and a third coil conductor. In the embodiment, the second coil conductor has a different shape than the first coil conductor and the third coil conductor. In the embodiment, the first coil conductor, the second coil conductor, and the third coil conductor extend parallel with each other in a first region in plan view as seen from an axial direction along the coil axis. In the embodiment, in the first region, when seen in a cross section cut along a plane including the coil axis, in an n-th turn, an arranging order of the first coil conductor, the second coil conductor, and the third coil conductor from an inner side in a radial direction thereof is inverted from that in an n+1th turn.

An inductor component having an element body includes two end surfaces opposite to each other and a bottom surface connected between the two end surfaces. A coil is provided in the element body and wound helically. Two external electrodes are provided in the element body and electrically connected to the coil. One of the external electrodes is formed over one of the end surfaces and the bottom surface while the other external electrode is formed over the other of the end surfaces and the bottom surface. The coil is formed such that an axial direction thereof is along the two end surfaces and the bottom surface. The coil includes a coil wiring wound along a plane orthogonal to the axial direction, and the aspect ratio of the coil wiring is 1.0 or more and less than 8.0.

A portable electric appliance with an energy saving device has an inductive capacitive reactor for low amperage use, acting as a multifaceted transformer with inductor and capacitor functionalities iteratively, includes: a stacked group of hollow centered continuous loop components sequentially arranged as follows: (i) a first ferrite toroidal component; (ii) a first separator component, being a doped separator component; (iii) a non-magnetic conductive metal toroidal component having a plurality of protrusions with notches between said protrusions; (iv) a second separator component, selected from the group consisting of doped and non-doped; (v) a second ferrite toroidal component. Another inductive capacitive reactor for industrial and commercial appliances with high amperage use has similar components as just stated and also has (v) a non-magnetic conductive metal toroidal component without protrusions; (vi) a third separator component; (vii) a second non-magnetic conductive metal toroidal component having a plurality of protrusions with notches between said protrusions, (viii) a fourth separator component; and (ix) a second ferrite toroidal component.

An inductor component having an element body includes two end surfaces opposite to each other and a bottom surface connected between the two end surfaces. A coil is provided in the element body and wound helically. Two external electrodes are provided in the element body and electrically connected to the coil. One of the external electrodes is formed over one of the end surfaces and the bottom surface while the other external electrode is formed over the other of the end surfaces and the bottom surface. The coil is formed such that an axial direction thereof is along the two end surfaces and the bottom surface. The coil includes a coil wiring wound along a plane orthogonal to the axial direction, and the aspect ratio of the coil wiring is 1.0 or more and less than 8.0.

A common mode choke coil according to one embodiment of the present invention includes a first coil conductor, a second coil conductor, and a third coil conductor. In the embodiment, the second coil conductor has a different shape than the first coil conductor and the third coil conductor. In the embodiment, the first coil conductor, the second coil conductor, and the third coil conductor extend parallel with each other in a first region in plan view as seen from an axial direction along the coil axis. In the embodiment, in the first region, when seen in a cross section cut along a plane including the coil axis, in an n-th turn, an arranging order of the first coil conductor, the second coil conductor, and the third coil conductor from an inner side in a radial direction thereof is inverted from that in an n+1th turn.

A circulating-current reducing circuit is provided that can suppress a circulating current with a simplified configuration having no control circuit. The circulating-current reducing circuit is connected to a transformer unit to reduce circulating current. The transformer unit includes: a first transformer device; a second transformer device that is connected to the first transformer device in parallel; and a switching element that controls timing of supply of current to a primary coil portion of the first transformer device and a primary coil portion of the second transformer device. The circulating-current reducing circuit includes a first circuit that is connected between the primary coil portion of the first transformer device and the switching element, and a second circuit that is connected between the primary coil portion of the second transformer device and the switching element.

A planar reactor includes a core and a coil. The core includes an upper board, a lower board and a pillar. The pillar is located between the upper board and the lower board. A winding space is located among the upper board, the lower board and the pillar. The coil is wound around the pillar and located in the winding space. The pillar and at least one of the upper board and the lower board are coplanar at a first side of the planar reactor. The pillar is sunk into the winding space from a second side of the planar reactor, wherein the first side is opposite to the second side. A first end of the coil is exposed from the first side of the planar reactor. A second end of the coil is hidden in the winding space partially or wholly at the second side of the planar reactor.