The invention provides a transformer suitable for use in a high frequency semiconductor device, and the transformer can be formed without the use of a conventional core and coils by forming at least two spiral inductors selected from a plurality of spiral inductors on a semiconductor substrate so as to overlap each other substantially in the vertical direction with an interlayer insulator interposed in between.

A transformer includes a bobbin, an I-bar, the first U-core, and the second U-core. The bobbin in a tube shape is wrapped around by a number of windings of copper coil. An I-bar made of high permeable alloy has a first end and a second end. The I-bar is inserted into the bobbin and the first end and the second end of the I-bar protrude outside the tube of the bobbin respectively. A first U-core made of high permeable alloy is placed on one side of the bobbin and a second U-core made of high perm...

A transformer including a first magnetic core and a second magnetic core having the shape of a flat plate. In the first magnetic core, a middle leg and substantially L-shaped outer legs whose inner sides are formed as circular-arc-shaped surfaces are provided in a standing manner at the central portion and at the comers of a rectangular flat plate, respectively. In addition, in the first magnetic core, a winding accommodating portion is formed between the circular-arc-shaped surfaces of the corr...

The invention relates to a transformer tank generally shaped like a rectangular prism and filled with insulating liquid and assembled mainly by welding. The tank comprises a detachably fastened transformer cover plate and a transformer core placed in the transformer tank while the cover plate is detached. In accordance with the invention, at least one of the substantially vertical walls of the transformer tank comprises a detachable wall portion whose detachment allows the transformer core to be...

A transformer includes a coil carrier having a first flange and a second flange. Primary and secondary coils are wound around the coil carrier between the first flange and the second flange. High-voltage contacts are located near the second flange and connected with the primary coil, and low-voltage contacts are located near the first flange and connected with the secondary coil. The first flange has a wall transverse to the coil carrier, and first and second sidewalls transverse to the wall so ...

The present invention is a kind of a transformer, equipped with a wire-winding flute on a wire-winding unit that has surrounding grooves added to each end, and adding plug pins to the for sides of a iron slot of a iron core, using the plug pins to attach itself to the inside of the grooves, for fast and close fixture of the wire-winding unit to the iron core, allowing the wire-winding unit to be not easily loosened, and also avoids collision leading to breakage of with the copper wires, thus inc...

A transformer is provided with a coil portion containing primary windings and a secondary winding. Cores sandwich the coil portion. Each of these windings includes a toroidal-shaped portion that is formed by winding flat type wires in a toroidal shape and by overlapping these flat type wires. Edge portions of this flat type wire are derived from the toroidal-shaped portion respectively. A plurality of windings and the cores are arranged along an overlapping direction of the flat type wires. empl...

A power transformer having at least one high voltage winding and one low voltage winding. Each of the windings includes at least one current-carrying conductor, a first layer having semiconducting properties provided around said conductor, a solid insulating layer provided around said first layer, and a second layer having semiconducting properties provided around said insulating layer. The windings are intermixed such that turns of the high voltage winding are mixed with turns of the low voltag...

To provide a technology capable of restraining direct current magnetic deviation in a transformer without providing a gap in a core, an axis of easy magnetization is provided in a second direction intersecting with a first direction along a magnetic circuit of the core to thereby bring a B-H characteristic of a material characteristic of the core into an unsaturated state.

There is provided a joint structure of a wound iron core in which iron core characteristics can be enhanced by improving the distribution of magnetic flux within an iron core. A wound iron core is formed to provide a joining structure or a butt joining structure and a lap joining structure disposed in an appropriate arrangement in which the a margin of overlapping is more increased as being closer to an outer periphery from an inner periphery of the iron core, taking a distribution of magnetic f...