Abstract: A power conversion apparatus is provided with: a plurality of power conversion circuits each provided with a transformer and supplying DC power to a common rechargeable battery; a control circuit configured to control the power conversion circuits; and a cooling device configured to cool the power conversion circuits. The cooling device is provided with at least one flow path for a coolant, the flow path being in thermal contact with the transformers of the power conversion circuits. When a load voltage of the rechargeable battery is equal to or higher than a predetermined threshold, the control circuit operates one power conversion circuit of the plurality of power conversion circuits, the one power conversion circuit provided with the transformer having a largest thermal contact area with the flow path, and stops operations of other power conversion circuits of the plurality of power conversion circuits.

Abstract: A transformer device according to the disclosure includes a transformer and a cooling device that cools the transformer. The transformer includes a primary coil, a secondary coil, and a first core and a second core, into which the primary and secondary coils are respectively inserted. The first and second cores are disposed to face each other. The first core includes a first core part and a second core part, each of the first and second core parts formed by dividing the first core in a predetermined division plane. The first and second core parts of the first core are disposed to face each other through a gap, and in which the first core and the cooling device are disposed to face each other.

Abstract: A power conversion apparatus is provided with: a plurality of power conversion circuits each provided with a transformer and supplying DC power to a common rechargeable battery; and a control circuit configured to control the plurality of power conversion circuits. When a load voltage of the rechargeable battery is equal to or higher than a first threshold, the control circuit selectively and sequentially operates the plurality of power conversion circuits such that one of the plurality of power conversion circuits is operated, and others of the plurality of power conversion circuits are stopped.

Abstract: A magnetic device includes a winding, and insulators by which the winding is surrounded. Each of the insulators is in contact with the winding. A gap exists between each two adjacent of the insulators in a winding direction of the winding.

Abstract: An electromagnetic relay includes a fixed contact, a moving contact, an electromagnet device, and a second coil. The moving contact moves from a closed position where the moving contact is in contact with the fixed contact to an open position where the moving contact is out of contact with the fixed contact, and vice versa. The electromagnet device includes a first coil and a mover. The mover is actuated on receiving a magnetic flux generated when a current flows through the first coil to move the moving contact from one of the closed position or the open position to the other position. The second coil gives, when a current flows through the second coil, at least a magnetic flux, of which a direction is opposite from a direction of the magnetic flux generated by the first coil, to the mover.

Abstract: A transformer includes a primary winding, a secondary winding, a first core, and a second core. The primary winding and the secondary winding are inserted into the first core and the second core, and the first core and the second core are disposed to face each other. The first core includes one first core portion, and the second core includes a plurality of second core portions. The first core is a lower core, and the second core is an upper core. The first core and the second core are disposed to face each other with a gap interposed between the first core and the second core. The first core and the second core include a heat-resistant elastic body in the gap, and are disposed to face each other. Each of the second core portions is disposed with a heat-resistant elastic body interposed between the second core portions.

Abstract: An electromagnet device moves two moving contacts from one of a closed position or an open position to the other position when an electric current flows through a coil. A regenerative current coming from the coil flows through a regeneration unit when the coil makes a transition from an energized state where the coil is supplied with an electric current from a power supply to a non-energized state where the coil is supplied with no electric current from the power supply. The control unit causes the regenerative current to flow through a load by controlling a switch when the coil makes the transition from the energized state to the non-energized state.

Abstract: A power conversion device is equipped with at least one leg circuit containing two switching elements connected in series, respectively, a transformer having a primary winding and a secondary winding, a capacitor connected between the leg circuit and one end of the primary winding, a switch circuit, and a rectifier circuit.

Abstract: An electromagnet device moves two moving contacts from one of a closed position or an open position to the other position when an electric current flows through a coil. A regenerative current coming from the coil flows through a regeneration unit when the coil makes a transition from an energized state where the coil is supplied with an electric current from a power supply to a non-energized state where the coil is supplied with no electric current from the power supply. The control unit causes the regenerative current to flow through a load by controlling a switch when the coil makes the transition from the energized state to the non-energized state.

Abstract: An electromagnetic relay includes a fixed contact, a moving contact, an electromagnet device, and a second coil. The moving contact moves from a closed position where the moving contact is in contact with the fixed contact to an open position where the moving contact is out of contact with the fixed contact, and vice versa. The electromagnet device includes a first coil and a mover. The mover is actuated on receiving a magnetic flux generated when a current flows through the first coil to move the moving contact from one of the closed position or the open position to the other position. The second coil gives, when a current flows through the second coil, at least a magnetic flux, of which a direction is opposite from a direction of the magnetic flux generated by the first coil, to the mover.

Abstract: A magnetic device includes a winding, and insulators by which the winding is surrounded. Each of the insulators is in contact with the winding. A gap exists between each two adjacent of the insulators in a winding direction of the winding.

Abstract: An electric power conversion device includes: a transformer including first and second windings magnetically coupled; a bridge circuit including a switch element; a rectifier circuit coupled to an output side of the transformer; a first resonant inductor; a second resonant inductor external to the transformer; and a resonant capacitor, wherein n1?n2, Cr>C1, and Lr>L2 where Lr is an inductance value of the first resonant inductor and L2 is an inductance value including an inductance value of the second resonant inductor and an inductance value of a parasitic inductance component that is in series with the second winding in the pathway from the second winding to the rectifier circuit.

Abstract: An electric power conversion device includes: a transformer including first and second windings magnetically coupled; a bridge circuit including a switch element; a rectifier circuit coupled to an output side of the transformer; a first resonant inductor; a second resonant inductor external to the transformer; and a resonant capacitor, wherein n1?n2, Cr>C1, and Lr>L2 where Lr is an inductance value of the first resonant inductor and L2 is an inductance value including an inductance value of the second resonant inductor and an inductance value of a parasitic inductance component that is in series with the second winding in the pathway from the second winding to the rectifier circuit.

Abstract: A coil structure includes a conductor band and a first insulating plate. The conductor band turns around a coil axis in such a manner that the conductor band folds at a plurality of portions which form a plurality of folded portions. The first insulating plate includes a first edge portion which abuts along at least one of the plurality of folded portions. At least part of the conductor band is wound around the first insulating plate.

Abstract: A rotary machine includes a rotor, a stator, a first hole and a second hole that are provided in at least one selected from the group consisting of the rotor and the stator, and a first insertion member including a first protrusion inserted into the first hole, a second protrusion inserted into the second hole, and a first connection connecting the first protrusion and the second protrusion to each other. A distance between the first hole and the second hole differs from a length of the first connection.

Abstract: A power converter includes a transformer including a transformer including a primary winding and a secondary winding magnetically coupled to the primary winding, a bridge circuit including a switching element, and an inductor. A direct current voltage is converted into an alternating current voltage by turning on and off the switching element in the bridge circuit. An output voltage in the secondary winding is induced by supplying the alternating current voltage to the primary winding. The inductor is disposed on a path connecting the switching element and the primary winding. A resonance inductance value Lr including a leakage inductance value of the transformer and an inductance value of the inductor satisfies Formula 1.

Abstract: A magnetic component includes a first winding and a second winding which is insulated from the first winding and magnetically couples with the first winding. The first winding forms a first coil unit by being wound. The second winding forms a second coil unit by being wound about the same axis as the first winding. The second winding forming the second coil unit is disposed in areas X and Z. The magnetic component has the first coil unit and the second coil unit at positions that satisfy Equations 1 and 3.

Abstract: A magnetic device includes a winding, and insulators by which the winding is surrounded. Each of the insulators is in contact with the winding. A gap exists between each two adjacent of the insulators in a winding direction of the winding.

Abstract: An electric power conversion device includes: a transformer including first and second windings magnetically coupled; a bridge circuit including a switch element; a resonant inductor; and a resonant capacitor, wherein the resonant inductor and the resonant capacitor constitute a resonant circuit together with an inductance of the first winding, n1?n2, the resonant inductor is inserted into a pathway from the first connection point to the second connection point via the first winding in series with the first winding, the resonant capacitor is inserted into a pathway from the second winding to the output terminal in series with the second winding, and Cr>C1 where Cr is a capacitance of the resonant capacitor and C1 is a capacitance of a capacitance component that is in series with the first winding in the pathway from the first connection point to the second connection point via the first winding.

Abstract: A vibration power generator comprises: a fixed substrate; a vibrating body having a surface opposed to the fixed substrate, the vibrating body being vibratable to the fixed substrate; electret electrodes aligned in a vibration direction on one of the surface of the fixed substrate and the surface of the vibrating body; and first fixed electrodes and second fixed electrodes alternately aligned in the vibration direction on the other thereof, wherein when the vibrating body is at a resting position, each of the electret electrodes overlaps with both electrodes of a corresponding fixed electrode pair, the corresponding fixed electrode pair being one of the first fixed electrodes and one of the second fixed electrodes that are opposed to the electret electrode, and when the vibrating body is not at a resting position, each of the electret electrodes always overlaps with at least one electrode of the corresponding fixed electrode pair.