Abstract: The current transducer is of the type comprising a Rogowski coil extending around a first conducting element in which a current to be detected flows. The first conducting element is provided at one end with a first terminal connector. A second conducting element is mounted on the first one so as to cover and preferably embed the external periphery of the coil. The second conducting element is electrically connected to the first conducting element at the end thereof which is opposite to the one end provided with the first terminal connector. A second terminal connector is provided on the second conducting element on the same side of the plane of the coil as the first terminal connector. This arrangement forces the current flowing between the first and second terminal connectors via the first and second conducting elements to flow around the periphery of the coil and thus to shield the coil.

Abstract: A transformer includes a preformed winding with each turn having a channel cross section. The individual units are joined to form the desired multiturn winding. Another winding is inserted within the channel cross section of the multiturn winding. In one embodiment, the channels of the two turns are joined to form a closed passageway. In another embodiment, they are nested one within each other to form a concurrent passageway.

Abstract: A low profile magnetic structure comprising E and I type core shapes is dimensioned with the passage length through the core window being very long compared with a cross sectional dimension of the windows. In a transformer design, windings passing through the window are designed to be coaxial with one winding being a shell for the other winding.

Abstract: A transformer assembly suitable for use in very high frequency (VHF) switching power supplies that maintains a low leakage inductance between critical transformer windings while complying with the physical and electrical requirements imposed by standards for primary to secondary isolation. The transformer includes a telescopic bobbin assembly with an inner and an outer section that telescope together to form an interior clearance space or chamber between the two sections. The interior chamber has a narrow conduit exiting to the exterior of the bobbin assembly. Described are two embodiments for a transformer used in a forward-averaging type converter and a third embodiment for a transformer used in a frequency modulated converter.

Abstract: A package for matching the characteristic impedance of a transmission line to the impedance of a pulsed semiconductor laser diode so that short duration pulses of light can be produced with a fast repetition rate. The package has a toroidal transformer in a cavity of a main body, with a multiturn primary connected to a transmission line. The laser diode is mounted at the edge of a known sandwich between two thin metal plates separated by an insulating layer. A spacer and metal cover cap are placed over the sandwich, and a screw passing through holes of all the parts is threaded into the main body. The screw passing through the transformer core forms a one-turn secondary. Not only does this allow the matching of the characteristic impedance, but also provides heat sinking for the diode. Assembly with a screw makes the unit easy to fabricate, and to replace the laser diode sandwich.

Abstract: A cooker apparatus for heating a cooking pot inductively comprises an induction heating coil and a control device for controlling the heating power. The control device has a temperature-dependent guiding and control means and a sensor unit, adapted to be positioned on the cooking pot and subjected there to the evolution of steam in the cooking pot. The sensor unit is arranged to transmit control signals to the guiding and control means.

Abstract: A magnetizing system includes a transformer core, a first winding surrounding the core and a tube-like second winding surrounding the first winding. The second winding is formed with a slot on its upper surface and has a portion located within this slot and extending beyond the upper surface of said tube. This portion is formed with a cross-section of a size substantially smaller than the size of the slot to produce a magnetic field of high density. A screening socket is positioned adjacent the material to be magnetized. This socket is made of a material having good electrical conductivity for absorbing the stray fields so that the material to be magnetized is exposed to the magnetic field produced by said extended portion.

Abstract: According to the invention, the ring transformer for resistance butt welders comprises a plurality of sections, each composed of a non-closed magnetic core, a part of the primary winding and a part of the secondary winding. Each section is so arranged with respect to the other sections that the end faces of its non-closed magnetic core are in contact with the end faces of the two adjacent sections, whereby the non-closed magnetic cores of all the sections make up a closed magnetic core of the transformer. The primary winding of each section is connected to those of all the other sections so that they all make up the primary winding of the transformer. The secondary winding of each section is connected to those of the other sections so that they all make up the secondary winding of the transformer.

Abstract: A magnetic transformer device includes a cylindrical transformer core, a first winding surrounding the core and a second winding surrounding the first winding. The second winding is formed as a ring-like element with a slot on its upper surface and has a portion located within this slot and extending beyond the upper surface of the second winding. This portion is formed with a cross-section of a size substantially smaller than the size of the slot to produce a magnetic field of high density.

Abstract: There is provided an improved RF transformer having a single-turn secondary of cylindrical shape and a coiled encapsulated primary contained within the secondary. The coil is tapered so that the narrowest separation between the primary and the secondary is at one end of the coil. The encapsulated primary is removable from the secondary so that a variety of different capacity primaries can be utilized with one secondary.

Abstract: Coil means between an annular casing electrode and a core casing electrode providing contact for high amplitude current conduction and flexibility during magnetic and structural loading in achieving substantially greater operational life in use with stress wave tooling.

Abstract: Disclosed is an induction heating apparatus wherein the tank circuit and heater coil are combined in a single unit which is separated from the power supply. A coil forms both the inductance element of a tuned circuit and the primary winding of a current transformer. The inductance element is associated with a secondary winding formed by a metal sheet of material wrapped about the inductance element and can form both the capacitance of the tuned circuit and the secondary winding of the current transformer. A heat transfer unit is connected directly to the secondary winding formed by the single turn of sheet material and is used to provide inductive heating to a work surface to which thermally activated adhesives are to be secured. The induction heating unit is formed as a hand-held portable gun and includes the electronic circuitry in a rear body portion of the gun and the heat transfer unit forms a nosepiece for the gun so that precise local areas can be heated.