An integrated common mode and differential mode inductor can include a first core including a first center leg, a second core including a second center leg, a first center winding on the first center leg, and a second center winding on the second center leg. The first center leg can be spaced apart from the second center leg, for example by a center air gap. The integrated common mode and differential mode inductor can further include a left winding on a first left leg of the first core and a second left leg of the second core, as well as a right winding on a first right leg of the first core and a second right leg of the second core.

A reactor includes a core and first to fourth coils wound around the core and magnetically coupled to one another. A coupling coefficient K12 between the first and second coils, a coupling coefficient K13 between the first and third coils, and a coupling coefficient K14 between the first and fourth coils satisfy relations K13>K12 and K13>K14; and a coupling coefficient K23 between the second and third coils, a coupling coefficient K24 between the second and fourth coils, and a coupling coefficient K34 between the third and fourth coils satisfy relations K24>K23 and K24>K34. Alternatively, n the core, a width of a first core part in a second direction is shorter than a width of the first core part in a third direction, a width of a second core part in the second direction is shorter than a width of the second core part in a third direction, a width of a third core part in the second direction is shorter than a width of a third shaft in the third direction, and a width of a fourth core part in the second direction is shorter than a width of the fourth core part in a third direction. Alternatively, a straight line crossing respective center axes of the first and fourth coils crosses a straight line crossing respective center axes of the second and third coils at a column part of the core when viewed in the first direction. This reactor hardly decrease an electric power conversion efficiency even at low load.

A reactor includes a core and first to fourth coils wound around the core and magnetically coupled to one another. A coupling coefficient K12 between the first and second coils, a coupling coefficient K13 between the first and third coils, and a coupling coefficient K14 between the first and fourth coils satisfy relations K13>K12 and K13>K14; and a coupling coefficient K23 between the second and third coils, a coupling coefficient K24 between the second and fourth coils, and a coupling coefficient K34 between the third and fourth coils satisfy relations K24>K23 and K24>K34. Alternatively, n the core, a width of a first core part in a second direction is shorter than a width of the first core part in a third direction, a width of a second core part in the second direction is shorter than a width of the second core part in a third direction, a width of a third core part in the second direction is shorter than a width of a third shaft in the third direction, and a width of a fourth core part in the second direction is shorter than a width of the fourth core part in a third direction. Alternatively, a straight line crossing respective center axes of the first and fourth coils crosses a straight line crossing respective center axes of the second and third coils at a column part of the core when viewed in the first direction. This reactor hardly decrease an electric power conversion efficiency even at low load.

A coil component used for two-phase transformer coupling includes: a first coil and a second coil; and a magnetic core at which the first coil and the second coil are provided. The magnetic core includes: a first magnetic leg at which the first coil is provided; a second magnetic leg at which the second coil is provided; a central leg portion interposed between the first magnetic leg and the second magnetic leg; a pair of connection portions connecting the first magnetic leg, the central leg portion, and the second magnetic leg in parallel; a main gap interposed in the central leg portion; a first gap interposed in the first magnetic leg; and a second gap interposed in the second magnetic leg. A coupling coefficient between the first coil and the second coil is not less than 0.7.

A coil component used for two-phase transformer coupling includes: a first coil and a second coil; and a magnetic core at which the first coil and the second coil are provided. The magnetic core includes: a first magnetic leg at which the first coil is provided; a second magnetic leg at which the second coil is provided; a central leg portion interposed between the first magnetic leg and the second magnetic leg; a pair of connection portions connecting the first magnetic leg, the central leg portion, and the second magnetic leg in parallel; a main gap interposed in the central leg portion; a first gap interposed in the first magnetic leg; and a second gap interposed in the second magnetic leg. A coupling coefficient between the first coil and the second coil is not less than 0.7.

A transformer three-dimensional wound core low-voltage lead structure is provided comprising a three-dimensional wound core formed of three rectangular single frames, and three phase windings. The wound core comprises three core posts and an yoke, the yoke being a triangular structure. The three phase windings are arranged on the three core posts, each phase winding comprising an internal low-voltage and high-voltage winding. The head end and the tail end of each phase low-voltage winding are respectively connected to a lead-out line, and the lead-out lines are located in a triangular structure region of the yoke, and a low-voltage bushing step-up module is provided above the wound core, three low-voltage bushings are provided on the low-voltage bushing step-up module, and the three low-voltage bushings are connected to the lead-out line of the corresponding low-voltage winding.

A multi-phase transformer includes a centrally-disposed first core, a plurality of second cores each provided outside the first core so as to constitute a loop-shaped magnetic path with respect to the first core, and a primary winding and a secondary winding wound on each of the second cores.

A multi-phase transformer includes a centrally-disposed first core, a plurality of second cores each provided outside the first core so as to constitute a loop-shaped magnetic path with respect to the first core, and a primary winding and a secondary winding wound on each of the second cores.

Auto-balancing transformers are disclosed for balancing a multi-phase electrical system by varying the degree of electromagnetic coupling between primary and secondary windings. The auto-balancing transformer includes a movable armature to selectively couple primary phases with two or fewer phases of the secondary system.

Auto-balancing transformers are disclosed for balancing a multi-phase electrical system by varying the degree of electromagnetic coupling between primary and secondary windings. The auto-balancing transformer includes a movable armature to selectively couple primary phases with two or fewer phases of the secondary system.