Abstract: An inductor (100) optimized for surface-mount vacuum-pickup automated circuit assembly eliminates the expense of an inductor housing. The inductor has a hollow rectangular ferrite core (101) and a winding defined by a stripline (102) deposited on the core surface. Winding ends are formed by conductive vias (103) in the core that open onto the core surface, where they connect and mount the inductor to a circuit board (150). A flat sheet (104) adhered to one face of the core provides a surface for vacuum pickup and for labeling of the inductor. The core of a passively tuneable inductor (200) defines multiple unconnected winding segments (102-103). Segment ends mount the inductor to the circuit board and connect the segments to circuit board striplines (254) that are laid out in a pattern to interconnect a number of the segments into a winding. The inductor is tuned by changing the stripline layout and thereby varying the number of interconnected segments.

Abstract: An ignition coil for an internal combustion engine and a method of making the same in which layers of the secondary winding are separated by a non-filtering/non-segregating material embedded in an electrically insulated ignition coil housing. The preferred non-filtering secondary winding separator is a solid filament, non-absorbing/non-adsorbing mesh, such as a nylon mesh. Using the non-filtering/non-segregating secondary winding separator prevents filler damming when an ignition coil housing is manufactured using a vacuum encapsulation and curing process in which an encapsulation compound (e.g. a thermal setting epoxy) has solid additives (e.g. sand fillers). Non-absorbing/non-adsorbing separators are also advantageous because the separators do not alter the chemistry of the encapsulation compound.

Abstract: An isolation transformer comprises two core pieces mounted to cooperate to provide flux paths, one of the core pieces being shaped so that a central flux path is defined by a central leg of the core, at least two magnetically coupled windings surrounding the central flux path, and an isolation layer sandwiched between the windings.

Abstract: Toroidal transformers and other toroidal magnetic components need insulation between separate windings. International safety standards specify minimum requirements for both total insulation thickness and number of layers of insulation. The safety requirements can be met by a toroidal transformer insulation method and toroidal transformer having, in combination, a wide sheet of insulation material covering the outside perimeter and the top and bottom radial surfaces of a winding but not entering into the center hole, and wrapping with a narrow strip of insulation material for covering the entire winding and the wide sheet of insulation material. Because the wide sheet adds insulation on the outside perimeter of the winding, which is larger then the inside perimeter of the center hole, the outer wrapping with the narrow strip need only provide the insulation actually required on the inside perimeter of the center hole.

Abstract: An apparatus for connecting primary conductive lines of a flexible transformer which assures the simple and reliable connection between the primary conductive lines. The apparatus includes a circular rigid supporting plate having an opening at the center thereof, a connecting member having an opening at the center thereof fabricated of a flexible insulator sheet having one surface where the supporting plate is adhered and the other surface where a plurality of radial conductive lines are deposited. The connecting member has a plurality of projecting portions at inner and outer peripheral edge portions thereof by cutting out the inner and outer peripheral edge portions where the radial conductive lines are not deposited. The projecting portions are folded to connect inner and outer parallel primary conductive lines.

Abstract: A transformer bobbin has margining ledges disposed on either side of a primary winding surface such that a primary wire is wound between margining surfaces of the margining ledges. L-shaped grooves extend into the margining ledges and then parallel to the primary winding surface to accommodate the primary wire ends that connect to terminals of the bobbin. Margining of the secondary is accomplished with a pair of margining bibs which attach to the bobbin after the primary is wound and after a layer of insulation is placed over the primary. The secondary is wound over the insulation layer between margining surfaces of the bibs. With the margining ledges and bibs, required creepage distances can be maintained without the use of sleeving, margining tape, interlayer tape or holding tape.

Abstract: A meandering winding magnetometer (MWM) includes a meandering primary winding and at least one sensing winding or coil on a membrane to be pressed against a test surface. The membrane may be supported on a flexible carrier which is translatable into a probe. Abutments in the probe press the carrier against the test surface but allow the carrier and membrane to conform to the test surface. One MWM circuit includes meandering primary and secondary windings. The return leads from the secondary winding return to connector pads in close alignment with the test array, while leads from the primary winding are spaced at least one wavelength from the array. In another MWM circuit, individual sensing loops are positioned within the meandering primary winding. The MWM circuit may be provided on an adhesive tape which may be cut to length.

Abstract: There are provided low profile inductor and transformer windings, and methods for fabricating the same. An elongate conductive ribbon is wound in one continuous direction on a generally hourglass shaped mandrel to form the ribbon into a double conical helix having a plurality of spaced apart coils. A sheet of dielectric material having an orifice therethrough is threaded to the midpoint of the double conical helix. The two sides of the helix are then compressed into planes such that the coils in each side lie flat and engage the adjacent side of the sheet of dielectric material. A compound inductor winding can be fabricated from a continuous conductive ribbon wound into a plurality of double conical helixes joined end-to-end. After compression, the compound winding consists of a low profile stack of spiraled windings connected in series, but constituting only one continuous ribbon having no internal connections.

Abstract: Prior to winding wire in a coil around a foil, the foil is coated on a least one surface side with a tacky silicone composition. A composition on the foil exerts a retaining force on the wires discouraging said wires from sliding away from an original or intended position.

Abstract: A coil winding structure of a flyback transformer comprises a plurality of layers of a coiled-circuit pattern sheet. The coiled-circuit pattern sheet includes a tubular sheet, a coiled-circuit pattern formed around the tubular sheet, and a magnetizable core inserted into the tubular sheet. The coiled-circuit pattern sheet and the magnetizable core have a shape of an elongated flexible strip. The coiled-circuit patterns are electrically connected in series with each other, and the magnetizable cores are connected with each other by a conductive binder and so on, so as to form a closed circuit in a zig-zag formation.

Abstract: An article of insulation, especially adapted for insulating corners, is provided. The article is constructed in the form of an elongated flexible sheet capable of sustaining and retaining at least one longitudinal fold therein and having generally a beginning end and a closing end and first and second, generally opposite longitudinal sides thereof. Each longitudinal side has a plurality of protrusions or tabs extending outwardly therefrom along the length of each side, with each protrusion being separated from adjacent protrusions such that, upon folding the sheet longitudinally along its centerline to form overlapping halves folded upon one another, the protrusions along the length of the first side overlap the separations along the length of the second side, and vice versa. The article has a second fold extending longitudinally thereof along the bases of the protrusions such that the overlapping protrusions form substantially a right angle with the remaining portion of the sheet.

Abstract: A power transformer is formed of a pair of cores having wiring storage portions, at least one primary winding formed of a spirally wound flat ring having a pair of primary leading portions, at least one secondary winding formed of a flat plate, at least one spacer interposed between the flat ring and the flat plate, and an insulation member mounted in the wiring storage portions of the cores. The flat ring, flat plate and at least one spacer for insulating the flat ring and the flat plate are housed in the insulation member. The insulation member has an opening for allowing the primary leading portions to pass therethrough. In order to insulate the primary leading portions from burrs of the secondary winding, a protrusion may be formed on an outer periphery of the spacer to be located under the primary leading portions, or a cut-out portion may be formed in the flat plate.

Abstract: A laminated coil-forming method for winding wires and insulation films around a core, includes the steps of winding a first insulation film around an inner coil formed around the core, winding a second insulation film around the first insulation film with the second insulation film having a smaller width than a width of the first insulation film, and winding a third insulation film around the second insulation film with the third insulation film having a greater width than the width of the second insulation film before forming an outer coil.

Abstract: An eddy current surface measurement array structure for complete coverage of an underlying inspection surface without requiring mechanical scanning is disclosed. A three-dimensional array of eddy current sense elements is organized as a plurality of layers of two-dimensional sub-arrays. The sub-arrays, although in different layers, are essentially identical in configuration, and are staggered such that the sense elements of one layer provide at least partial coverage of portions of the inspection surface not covered by the sense elements of another layer. As many staggered layers are included as are necessary to ensure that no "blind spots" remain, for complete coverage of the underlying inspection surface. The sense elements are disposed in a layered flexible structure fabricated employing high density interconnect fabrication techniques or other photolithographic techniques.

Abstract: A single phase, dry type transformer has an iron core, high voltage windings embedded in cast resin, and low voltage windings resin encapsulated. The low voltage winding is constructed with flexible sheet conductors. Insulating material includes a means to secure the windings in place during a vacuum and pressure resin impregnation process. The result is a coil that exhibits high short circuit protection due to the tightly bond conductors comparable to completely resin encased molded transformers at a substantially reduced cost.

Abstract: A magnetic field sensor includes a number of magnetoresistive sensor elements situated in one plane, and which have the same privileged directions of magnetization, and a magnetization coil connected to a current pulse generator which alternately supplies the magnetization coil with opposite current pulses to generate a magnetic field which extends parallel to the privileged directions of the sensor elements and is strong enough to reverse the direction of internal magnetization thereof The magnetization coil includes an electrically insulating substrate which supports an approximately spiral-shaped electric conductor track including a group of parallel arranged active conductor elements. An electric current flows through the conductor track in the same direction in all active conductor elements of the relevant group.

Abstract: A winding support body (6, 10) for transformers/reactors with a winding of a tape-formed superconductor (8), wherein the support body consists of a substantially straight, circular-cylindrical tubular body which, on the side where the winding is to be placed and out towards the two ends, is provided with a helical slot with a plane surface with a width equal to the width of the tape. In this way, each turn of the slot around the support body forms a surface which practically constitutes the envelope surface of a straight frustum of a cone. The angle (v) between a generatrix (9) of the envelope surface and the axial center line of the support body increases for each turn out towards the ends of the support body in such a way that the envelope surface at all points coincides with the direction of the magnetic field (FIG. 4 ).

Abstract: A high voltage step-up transformer incorporating dual insulating layers, a relatively thick, heat-resistant "TEFLON" layer exhibiting extremely low dielectric losses and a thinner epoxy layer having a tractive, non-skid outer surface supporting a large plurality of fine wire secondary winding turns.

Abstract: Insulating flexible sheets and electroconductive flexible sheets having electroconductive patterns are stacked alternately into a multi-layer structure to form a laminated body. The inclining directions of the obliquely formed electroconductive patterns are varied alternately from layer to layer, and the patterns of different layers are electrically connected by electro-conductive connecting parts formed on the insulating sheets. A pattern of a single line wound in the same direction is formed by rounding the laminated body so as to connect the patterns to each other and thereby form a cylindrical multi-layer coil. Further, by opening the connecting part to make it a tapping part and reducing the number of turns of the multi-layer coil, the inductance of the coil can be set as desired.

Abstract: An ignition coil has an inorganic insulator material featuring a larger conductivity in the direction along the surface of the material than in the direction perpendicular to the surface of the material, between high-tension voltage components internal to a casing and conducting components internal and external to the casing. Localized discharge deterioration advancing from the high-tension components toward the conducting components is changed in its direction of advance to the direction along the surface of the inorganic insulator material, and is diffused accordingly. The resistance of the ignition coil against localized discharge deterioration is increased, and improved reliability in breakdown performance is resulted. This leads to a compact design.The casing and bobbins are constructed of mica sheet as inorganic insulator material using insert molding technique, and productivity of the ignition coil is improved.

Abstract: An improved core-form transformer is disclosed. The core-form transformer includes a c-wrapped ribbon conductor with opposing wide sides and opposing thin sides. The c-wrapped ribbon conductor is wound around a core to form a plurality of coil sections. Adhesive is applied directly to one of the wide sides of the ribbon conductor to form a strong mechanical coupling within the coil sections. A novel transposing fold of the ribbon conductor is employed to create coil transpositions. The core-form transformer of the invention reduces circulating current losses while utilizing only a small number of transposing folds, generally adjacent to a first coil section, a last coil section, and an intermediate coil section.

Abstract: Electrical isolation which is required between adjacent windings of a device such as a transformer is provided by wrapping a group of individually insulated conductive cores 62, 64, 66, 68 with multiple turns of a thin tape 32. Use of a thin tape rather than solid insulation provides a long creepage path from the cores 62, 64, 66, 68 to adjacent components. The invention can also be applied to components other than transformers.

Abstract: Insulation tubing (66) having adjustable dimensions is disclosed. The insulation tubing has an outer tubular wall that defines a central opening for receiving the core (4) and windings (8) of a partially assembled toroidal transformer. The wall is formed by preformed sections (44, 62) of electrical insulating material (10-20). The preformed sections have overlapping surfaces that are slidably positioned relative to one another. In this way, the extent of the surfaces that overlap can be changed to alter the size of the opening such that conductive windings (8) of various sizes and configurations can be accommodated.

Abstract: The present invention is directed to a twisted conductor in which better use is made of the material and at the same time the structural dimensions are reduced. The partial conductor has a sharp bend so that the two partial conductor stacks are mutually parallel and leave a space between them. An intermediate piece is fitted in this space in the region of the bend. Thus there is a cooling channel in the twisted conductor for the radial flow of coolant. To ensure that the partial conductor bunch forms a coherent twisted conductor there is a casing in the region of the bend. This casing is a glass-cloth binding pre-impregnated with epoxy resin in the B state. Because of the improved filling factor, the structural height of the transformer can be reduced, resulting in the elimination of the paper insulation itself and the longitudinal intermediate pressboard layer. Moreover, the intermediate pieces can be thinner since there is no longer any need to allow for the expansion of the paper in the spacers.

Abstract: A dry type transformer has an iron core, high voltage windings embedded in cast resin, and low voltage windings resin encapsulated. The low voltage winding is constructed with flexible sheet conductors coincident with layer insulation sheets that extend beyond the edge of the sheet conductor. Cooling air ducts are fabricated in the low voltage windings as it is wound. To prevent the extension of the layer insulation sheets from collapsing over the formed air ducts during a vacuum and pressure resin impregnation process, reinforcing means are added to the extensions to prevent them from collapsing.

Abstract: An ignition coil is disclosed that includes a primary coil, a secondary coil and a core about which the primary and secondary coil are disposed. The secondary coil has in inner diameter greater than the diameter of the primary coil. The primary coil is disposed on the core and the secondary coil is disposed about the primary coil. The secondary coil includes a spiral-back pyramid winding configuration which results in a desired distributed capacitance for the secondary windings thereby providing desired electrical characteristics for a resonant circuit. The winding layers of the secondary coil decrease in the number of turns as the coil is wound to achieve a desired distributed capacitance of the coil. A spiral-back winding technique decreases adjacent winding layer voltages so that the inter-layer insulation requirements are reduced to a lower value thereby decreasing the insulation thickness of the secondary coil.

Abstract: A transformer in which the primary coil and the secondary coil are insulated from the iron laminations which form part of its flux paths by insulated covers which snap-on to the primary and secondary coils.

Abstract: A transformer structure of modular parts comprises a bobbin for supporting the primary winding, and one or more sets of end pieces sized to successively fit one over another in a nesting arrangement. The end piece flanges provide part of the secondary winding support surface. Further winding surfaces may be provided by adding further sets of end pieces which nest one within the other. The end piece flanges afford added inter-winding isolation. A double flange version of the end pieces affords still greater isolation. While applicable to small-scale transformers, the concept can also be adapted for medium and larger-size transformer designs.

Abstract: A dry type transformer has an iron core, high voltage windings embedded in cast resin, and low voltage windings resin encapsulated. The low voltage winding is constructed with flexible sheet conductors. Insulating material includes an apparatus to secure the windings in place during a vacuum and pressure resin impregnation process. The result is a coil that exhibits high short circuit protection due to the tightly bond conductors comparable to completely resin encased molded transformers at a substantially reduced cost.

Abstract: A transformer having a plastics coil former on whose hollow winding tube (7) between flanges (3, 5) windings (11, 13) of different potentials are wound with one winding wound on top of the other. The flanges (3, 5) are provided with spacers (17, 19, 23) to keep the windings (11a, 13a) axially spaced from the flanges (3, 5). An insulating layer (21), which extends from flange to flange, is interposed between the windings (11, 13). The winding (11) nearer the coil-former axis is spaced from the flanges (3, 5) by fixed spacers or stepped portions (17, 19) provided on the winding tube (7). The winding (13) arranged on the insulating layer (21) is spaced from the flanges (3, 5) by spacing blocks (23) which are connected to the flange areas (24) of the coil former by integral hinges (25). The spacing blocks are operable for swinging down onto the insulating layer (21).

Abstract: An ignition coil for an internal combustion engine has a corrodable metallic core (9, 10) about which is provided a circumferential primary coil former (1) upon which is wound a primary coil (2). Circumferentially disposed around the primary coil is a secondary coil (3) located on a former (13). So as to prevent the corrodable metallic core ( 9, 10 ) from fracturing the primary coil former, there is disposed an absorbing layer (12) between the core and the primary coil. The stress absorbing layer may be provided between the primary coil and the primary former or the primary former may comprise a deformable inner cylindrical member (1b) and a substantially rigid outer cylindrical member (1a) with the stress absorbing material (12) located in the annular space between the inner cylindrical member and the outer cylindrical member. The stress absorbing material in such an alternative embodiment may be formed of foamed rubber-like material or may be an air gap.

Abstract: An apparatus and method for structurally restraining and reinforcing an amorphous metal core of an electrical transformer employs an adhesive bonding agent applied to the lamination edges and protective layers of the core followed by adhesion of a woven fabric thereto to form a highly permeable oil/air interface with the lamination edges of the amorphous material, while providing an effective chip containment system thereto. A temporary guide sleeve aids the core and coil lacing operation. A method for breaking performance inhibiting interlaminar bonds between the amorphous layers of the core is also disclosed.

Abstract: A transformer is disclosed which has a primary and a secondary winding disposed concentrically around a core via a flanged bobbin. Each winding has a conductor wire which is doubly or, preferably, triply sheathed with insulating tapes of different widths. The first or inmost insulating tape is wound overlappingly in a first direction around the conductor wire without being bonded thereto. The second or intermediate insulating tape, less in width than the first, is wound overlappingly in a second direction, opposite to the first direction, over the first insulating tape and bonded thereto via a preformed adhesive layer on the second insulating tape. The third or outmost insulating tape, still less in width than the second, is wound overlappingly in the first direction over the second insulating tape and bonded thereto via a preformed adhesive layer on the third insulating tape. The ratio of the overlap of each tape to the tape width becomes progressively less from the inmost toward the outmost tape.

Abstract: An insulating tape for winding coils which includes a guide sheet having a predetermined width and a plurality of narrow insulating strips provided with adhesive on both surfaces thereof and removably connected to the guide sheet at predetermined spaces, facilitating accurate winding of insulating strips on a bobbin or the like and further enabling the winding operation to be carried out automatically.

Abstract: Disclosed are a magnetic ribbon on at least one surface of which fine particles formed of a nonmagnetic inorganic substance having insulating properties are attached and a magnetic core around which this magnetic ribbon is wound or on which it is laminated. The fine particles serve as a spacer to form a layer of air between adjacent layers of the magnetic ribbon.

Abstract: A safety insulated transformer where there are at least three layers of safety approved insulating material between any parts of the wires forming first and second windings. The first winding is wrapped torroidally with a strip of safety approved insulating material, the successive layers of that wrapping overlapping to form at least two of the required layers of safety approved insulating material, and either overlapping to form all three required layers or at least one of the wires having a coating of safety approved insulation. Preferably the ends of the wire of the first winding have end insulation comprising coiled overlapped layers of safety insulation, and a layer of additional safety insulation material of at least two superimposed thicknesses makes a minimum of one and one half turns transversely of the coil of the first winding around the coil in the region or regions where the ends leave the coil.

Abstract: A transformer having a barrel winding comprised of flat conductive film conductors is provided with a repeatable winding configuration by employing a dielectric metal laminate as the winding material and by patterning both primary and secondary windings on the same dielectric membrane, thereby fixing the relative positions of the primary winding and secondary winding terminals and conductors.

Abstract: A method of making an amorphous metal transformer core includes the steps of providing an amorphous metal core having two legs which are connected by an upper and a lower yoke, wrapping each of the legs with a sheet of flexible material which is capable of withstanding, without degradation, the temperature which is required to anneal the amorphous metal core, and then annealing the amorphous metal core. An amorphous metal transformer core includes a stack of amorphous metal laminations, the stack being formed into two legs which are connected by upper and lower yokes in which the legs are wrapped with a sheet of flexible material which is capable of withstanding, without degradation, the temperature required to anneal the amorphous metal core.

Abstract: An ignition coil is provided with a primary coil which includes a distributed constant circuit including inductance and capacitance. A thyristor is connected in parallel to the primary coil, and a secondary coil is magnetically coupled to the primary coil. When a predetermined voltage is supplied to the primary coil, the capacitance is charged. If the thyristor is turned-on, the capacitance is discharged sequentially with time deviation since charge of the capacitance is sequentially delayed by the inductance which is connected in parallel to the capacitance.

Abstract: A coil has one or more layers of primary and secondary windings about a bore liner, with the primary and secondary windings separated by a winding of glass threads. The coil is heated in an oven to first drive off the volatiles of the binder forming part of the ceramic insulation for the primary and secondary coils and which volatiles pass through the winding of glass thread. The coil is further heated so that portions of the glass fibers forming the threads vitrify with the non-vitrified remaining portions retaining their well-defined, discrete fiber characteristics, whereby they extend through the vitrified glass to seal the coil, reinforce the coil against vibration and shock, and enable a dimensionally compact coil.

Abstract: A winding construction for a transformer includes a single frame transformer core, an insulator layer, a primary winding, and a secondary winding. The secondary winding is wound with turns wound in a tilted arrangement on the single frame transformer core, whereby it can exhibit the same effects as the conventional partition or layer type transformer but without the need for an additional partition layer and achieves enhanced performance and reduced volume.

Abstract: Method for fabricating a laminated coil conductor for a high current coil which includes wrapping a layer of insulation around a rotatable shaped mandrel and then winding a plurality of copper sheets over the insulation as the mandrel is rotated. Solder is interposed between the copper sheets and between coolant tubes positioned on each end of each coil conductor. The assemblage is then removed from the mandrel and raised to a temperature to bond the copper sheets and coolant tubes together. The assemblage is then placed in a structural box and a plastic is injected into the box to fill any voids between the coil conductor and the box.An assembly of a plurality of coil conductors arranged in a high current coil according to the method is illustrated.

Abstract: A conductive film magnetic component such as an inductor or transformer includes a conductive film winding having a generally serpentine configuration when disposed in a plane. This film is folded to form a stack of layers with each "layer" comprising part of a winding turn and with successive "layers" connected at the folds via the continuous conductive film. The conductive film may be self-supporting and coated with a dielectric layer or may be disposed on a dielectric membrane. The film and membrane are preferably patterned photolithographically.

Abstract: A high voltage coil manufactured by alternately winding coils and mounting rigid insulating tubes on a coil form having end plates with terminals. After each coil is wound with its ends terminated at the end plates, a first axially slitted insulator tube is snapped over the coil with about a one-quarter inch gap and a second tube with no gap is snapped over the first rotationally displaced 180 degrees enclosing the gap which forms a flow conduit. Another coil is wound on the second tube and the process is repeated to form as many as six coils. Potting material is applied to the completed assembly and vacuum impregnated, and the tube conduits form flow paths to achieve complete impregnation.

Abstract: A method of manufacturing an armature coil, which comprises a printed coil obtained by printing and arranging a plurality of sets of unit coil groups, each comprising an even number of unit coils, on a belt-like, thin and pliable insulating material, and a pliable insulating material overlaid over and wound together with the printed coil, wherein the gaps between the printed coil and the insulating material and between the adjoining material layers are filled for fixing in the state the printed coil and the insulating material have been wound and laminated into a cylindrical shape, is featured in that a thermoplastic adhesive material is applied to the surface of the insulating material, and a tailing end of the insulating material is adhered to the adjoining inner peripheral layer by heating at least in the step of winding and laminating the printed coil and the insulating material into a cylindrical shape.

Abstract: An armature coil has sets of unit coil groups, each comprising an even number of unit coils, which are printed and arranged on a belt-like, thin and pliable insulating material to form a printed coil. The printed coil is wound and fixed into a cylindrical shape, the armature coil being featured in that the gap between adjacent conductors of the unit coil groups located on the outer periphery side of the cylindrical shape is set larger than the gap between adjacent conductors of the unit coil groups located on the inner periphery side thereof such that the conductors of respective unit coils are axially arranged to take the same angle in the circumferential direction.

Abstract: An improved transformer for withstanding and decoupling high voltage input impulses has a layer wound primary with interlayer insulation also serving as a spacer between the primary winding and the secondary winding and also as a spacer between the primary winding and the core. The secondary is preferably random wound on a preformed bobbin. A spaced adjacent relationship between the primary and secondary reduces the mutual inductance and interwinding capacitance.

Abstract: A method of making a transformer having an amorphous metal core uses resin coated substrate to reduce amorphous metal contaminants in the transformer coolant. The face of an annealed wound amorphous metal core is covered with a resin coated substrate. The core and resin coated substrate are bonded by pressing the core face. The second face is then done in the same way. The resulting resin coated substrate and transformer core is a unit. The substrate prevents amorphous metal pieces from escaping into the transformer oil and becomes a structural member of the core.

Abstract: Improvement for power supplies include a protection circuit having a first L-C filter network, a second L-C filter network and a voltage clamping device such as a zener diode which is disposed between the two L-C filter networks. The protection circuit reduces the magnitude of overvoltage input transients which might otherwise damage the internal components of the inverter. For generating very high output voltages, the power supply includes a high voltage transformer and a Crockoft-Walton voltage multiplier coupled thereto. The high voltage transformer is coupled to an inverter through a coupling circuit which includes a capacitor in one leg of the primary winding and a parallel connected resistor/inductor in the other leg of the primary winding of the high voltage transformer. The high voltage transformer is formed of a multi-sectioned bobbin which is defined around an axially extending core.

Abstract: An electrically insulating formed channel member is made of a sheet of an electrically insulating material capable of being press formed that is cut to provide radially projecting portions. Thereafter, the sheet is press-formed to form a formed channel member including the channel portion and the projection portions and bent to extend along the inner corner of a rectangular pancake coil with the web located at the inner side of the corner curvature. The sheet material may preferably be a dray paper press board. Ripples may be provided in the sheet material prior to the step of press-forming. The moisture in the sheet material may also be adjusted prior to the step of press-forming.