Abstract: A DC-DC converter of multi-output type is provided wherein a primary winding 5a is wound around core halves 5g, 5h of a transformer 5 between first and second secondary windings 5b, 5c of transformer 5 also concentrically wound around core halves 5g, 5h to form an electromagnetic sparse coupling between first and second secondary windings 5b, 5c. When on-off operation of first and second primary MOS-FETs 2, 3 generates first and second DC outputs VO1, VO2, the electromagnetic sparse coupling can reduce, attenuate or relax serge voltage induced on first secondary winding 5b.

Abstract: An electric machine comprises a core (10) of magnetic material and a first insulating layer (14) of a solid electrically insulating material surrounding the core. A high-voltage winding (17) in the form of an electric conductor is wound around a first part (16) of the first insulating layer and a field-equalizing member (19) is arranged around a second part (18) of the first insulation layer. Further, a second insulating layer (20) of a solid electrically insulating material surrounds the high-voltage winding and the field-equalizing member. The field-equalizing member comprises at least one first sub-member in the form of a winding (27, 28, 37, 38), and an electric cable conductor (31) is intended to be connected to the high-voltage winding at the field-equalizing member.

Abstract: In a main conductor for a capacitively controlled high-voltage winding composed of pancake coils for transformers, in which the main conductor for the load current is realized as a twisted conductor, and in which a control conductor is provided which is spatially arranged inside the twisted conductor and is electrically separated from the twisted conductor, the main conductor consists of two twisted conductors (1, 2) that are electrically separated from each other. The control conductor consists of several flat copper conductors (7) covered by an insulating sheath (7a), and the copper conductors (7) are fastened to one of the twisted conductors (1, 2).

Abstract: An electrical reactor assembly and method of assembly is disclosed. The reactor is formed from a combination of a magnetic T-core and a pair of magnetic L-cores. A plurality of comb-like separators is placed over a vertical portion of the T-core. A wire, with a rectangular cross-section, is wound about the vertical portion of the T-core thereby forming a coil. The comb-like separators electrically isolate the wire from adjacent windings and the T-core. The L-cores are attached to the T-core such that they flank two sides of the coil. A plurality of taps is formed on a side of the coil that is not flanked by one of the L-cores. The taps are formed by extending individual windings further from the T-core than other common windings. Preferably, a hole is formed through the rectangular wire at the taps to provide a secure electrical connection to the wire.

Abstract: 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 voltage winding.

Abstract: A high-voltage transformer includes a bobbin that holds a core at its center. This bobbin has eight winding grooves arrayed along the central axis of the core. A primary coil is wound around each of two outermost winding grooves with a predetermined number of turns. A secondary coil is wound around the six winding grooves near the center with a predetermined number of turns, which are distributed among these winding grooves. The cathode of a diode is connected through a terminal to one end of the secondary coil where the winding starts, while the anode of another diode is connected through another terminal to the other end of the secondary coil where winding ends.

Abstract: A detection coil for use in nuclear resonance magnetic (NMR) spectroscopy and a method of manufacture thereof. At least two film layers of material are deposited on an outer surface of a cylindrical tube of dielectric material. The layers are patterned to form a solenoid on the tube. At least one of the deposited materials is a conductor.

Abstract: In a laminated impedance device, coil conductor patterns are electrically connected in series through via-holes to form a substantially U-shaped spiral coil. A first group of the coil conductor patterns defines a first coil portion of a high-permeability coil unit. A second group of the coil conductor patterns defines a second coil portion of a low-permeability coil unit, and a third group of the coil conductor patterns defines a third coil portion of the low-permeability coil unit. A fourth group of the coil conductor patterns defines a fourth coil portion of the high-permeability coil unit. The first, second and third coil portions are wound clockwise, while the fourth coil portion is wound counterclockwise, as viewed from the top of the impedance device. Therefore, the laminated impedance device yields a high inductance in the low-permeability coil unit, and can be mounted in any direction and orientation.

Abstract: A fly back transformer comprises a horizontal output section; a low-voltage bobbin forming a first coil; a high-voltage bobbin forming a second coil having high-voltage coil layers and high-voltage rectifier diodes connected in series between upper terminal pins and lower terminal pins; a focusing pack having a PCB being printed with an adjustable resistor, and a focus input terminal; a bleeder resistor detachably fixed in position to the high-voltage bobbin and electrically connected with a high-voltage terminal of the high-voltage bobbin and the focus input terminal; and a focus-drawing wire disposed between the first and the last of the high-voltage coil layers, and having one end connected to draw a voltage generated between the high-voltage terminal and a low-voltage terminal of the high-voltage bobbin and the other end connected with the focus input terminal.

Abstract: To prevent a substrate for mounting electronic components from being damaged when cores are rubbed together during assembly, a pair of core members sandwich a part of a coil pattern formed on the substrate from the top and bottom sides of the substrate, and the core members are held together by a core-combining member. A cover member is fixed to the substrate to cover the upper side of the core-combining member. Inclined ribs on the cover member raise the core-combining member by abutting against external inclined fates of leg portions of the core-combining member. A clearance thereby is formed between internal faces of a top bar portion of each core member and a surface of the substrate.

Abstract: A choke coil has small difference of wire wound resistances between coils to obtain sufficient unbalance attenuation amount, superior in workability in winding and reduced leakage inductance and line capacity. The choke coil includes first and second coils divided into first and second segments wound on a single spool disposing intermediate insulations layers between respectively adjacent coil segments. The coil segments of the first and second coils are wound alternately. The first coil segment of the first coil and the second coil segment of the second coil being wound in a first winding number and the second coil segment of the second coil and the first coil segment of the second coil being wound in a second winding number. The second winding number being greater than the first winding number for reducing difference of winding resistance between the first and second coils less than or equal to 4%.

Abstract: A small-sized laminated inductor made via a simple firing process includes insulating magnetic sheets made of high permeability materials in which first coil conductors are provided on the surfaces thereof, insulating magnetic sheets made of low permeability materials in which second coil conductors are provided on the surfaces thereof, and other suitable materials. The first and second coil conductors are electrically connected in series through via holes provided in the magnetic sheets to define a spiral coil. In the spiral coil, the first coil conductors are wound in the counter-clockwise direction, while the second coil conductors are wound in the clockwise direction.

Abstract: A transformer for a microwave oven capable of preventing quality deterioration thereof due to damaged insulating paper, includes a first core having a coil inserting section having one open side; a plurality of coils sequentially inserted into the coil inserting section in an inter-electrically insulated state; a second core coupled,to the first core, and for covering the open side of the coil inserting section; and a resin molding section formed to cover the whole area of the plurality of coils.

Abstract: A transformer apparatus which can reduce a switching noise current flowing between a primary side ground and a secondary side ground is provided. The transformer apparatus includes a first core having a first primary winding wound around the first core, and second core having the substantially same structure as that of the first core, and having a second primary winding wound around the second core. The second primary winding is connected in parallel to the first primary winding. The transformer apparatus further includes a third core having a secondary winding around the third core, which is entirely and electrostatically shielded by a first conductor housing. The third core is arranged so as to be sandwiched between the first and second cores via first and second electrostatically shielding disks electrically connected to a second conductor housing.

Abstract: In one embodiment of the present invention, a transformer includes a first secondary winding made of stamped and bent metal. This first secondary winding has a coil portion with substantially closed cross section. The transformer also includes a primary winding made of wire and having a coil portion wound around the coil portion of the first secondary winding. A second secondary winding made of stamped and bent metal and having a coil portion with substantially closed cross section has its coil portion disposed about the coil portion of the primary winding. The primary winding further includes a second coil portion wound around the coil portion of the second secondary winding. The transformer thus provided is easier to build and less apt to internal short-circuiting than alternative designs.

Abstract: A transformer has a bobbin made of a resin material having flanges (2a to 2f) formed thereon, at least three chambers defined between the adjacent flanges. A primary auxiliary winding (P2), which supplies an electric power to an drive-control and overvoltage protection circuit and a primary excitation winding (P1-1) are wound on the chambers (3a and 3c) with at least one chamber (3b) disposed therebetween. A secondary winding (S2) which consumes the electric power always is wound on the chamber (3b) between the chambers (3c and 3a) on which the primary excitation winding (P1-1) and the primary auxiliary winding (P2) are wound.

Abstract: A transformer is provided that consists of a primary winding, a secondary winding and a magnetic core. The primary winding is wound directly around the magnetic core, thereby removing the need for a bobbin. By removing the need for the bobbin, the transformer has a large window utilization factor, and associated low profile. As a result, the transformer has a high power to form factor ratio. A method for making the transformer includes the steps of joining two halves of the core before winding the primary winding. Because the half-cores are joined prior to the wrapping of the primary winding, the core provides bobbin functionality. In addition, a header plate is provided for coupling a plurality of leads of a transformer to sources on an integrated circuit board, where the transformer consists of a magnetic core, a primary winding and a secondary winding. The header plate engages the magnetic core, providing a termination path for the wire of the secondary winding.

Abstract: A transform-rectifier module has a one-half turn secondary winding installed with very short, direct connections to four rectifiers. The core of the transformer has two parallel through holes. The secondary winding comprises two "Y" shaped windings. The "Y" legs of each winding are installed through the through holes from opposite sides of the core, and the ends of the "Y" windings connect to the four rectifiers. The common connections of the "Y" windings terminate on a ground plane. The rectifiers may be mounted on a common power plane which may also be a heat sink for the rectifiers and a mounting plate for the module as a whole. There is room through the through holes for a primary winding, which may be installed during manufacture or later. The modules may be used singly or in a matrix transformer-like arrangement. They are characterized by very low leakage inductance, high current capacity, good thermal properties and a low profile.

Abstract: A wideband audio output transformer for use with a push-pull vacuum tube amplifier using a multifilar ribbon in which primary windings and secondary windings coexist. The multifilar ribbon is wound continuously around a common core side by side to form successive layers. The primary windings are connected in series by turning the multifilar ribbon after the layers of multifilar ribbon have been wound and connecting the trailing end of the multifilar ribbon to the beginning end of the multifilar ribbon. Two additional wires are added in parallel with wires of the primary windings in the multifilar ribbon to redistribute the effective capacitance throughout the windings. The winding scheme eliminates the signal imbalance of an output transformer with a balanced push-pull primary winding and an unbalanced secondary winding at high frequencies.

Abstract: The low-profile magnetic device comprises at least one winding formed by a plurality of conductive metal laminations (9) of substantially annular layout, superposed and electrically insulated from each other and with respect to the ferromagnetic core and furnished with appendages (9X) for external connection. The laminations are accommodated in a well (7A) produced in an electrically insulating container (7) inserted into the said ferromagnetic core (1A, 1B) and a sheet of insulating material (11) is disposed between adjacent laminations. Each of the said laminations (9) is furnished, along at least one of its edges, with a plurality of protuberances (9A, 9B, 9C) disposed in such a way that on mutually superposing identical laminations rotated by 180.degree. one with respect to another about a mid-line (M--M) lying in the plane of the lamination, the protuberances of one lamination (9) are angularly offset with respect to the protuberances of the adjacent laminations.

Abstract: Various embodiments of on chip-transformers constructed in separate metal layers in an insulator that serves as a dielectric which is formed on a substrate such as a silicon substrate. Windings with currents flowing in a first direction are constructed in a first metal layer and windings with currents flowing a second direction are constructed in a second metal layer. Windings in the first metal layer are connected to windings in the second metal layer by connectors such as vias. The transformer can be constructed in a balun layout, an autotransformer layout, a layout with the secondary separated from the primary, a layout with the secondary separated the primary and rotated with respect to an axis of the primary, a layout in which the transformer is a two stage transformer and with the first stage constructed orthogonal to the second stage, or a transformer in which the windings are constructed in a toroidal layout.

Abstract: A planar winding assembly includes first and second windings, each winding having an axis and a pair of insulative sheet layers, laminated together, with at least one of each of the pairs of insulative sheets having a hole. Each winding further includes a metal strip conductor that is wound about the axis of its winding and is sealed between the laminated insulative sheet layers. The metal strip conductor has a portion projecting into the hole. The metal strip conductor of the first winding is electrically connected to the metal strip conductor of the second winding through the holes of the insulative sheets.

Abstract: A transformer which has a core, a wire for a primary coil and two wires for a secondary coil. The wire for a primary coil and one of the wires for a secondary coil are wound around a body of the core together, that is, are bifilar-wound. The other wire for a secondary coil is single-wound around the bifilar-wound wires. The two wires for a secondary coil are connected in series to form a secondary coil, and the wire for a primary coil forms a primary coil by itself.

Abstract: A process for preparing an insulated metallized substrate, wherein a specified metallized substrate is heated from ambient temperature to a peak temperature of at least about 800 degrees centigrade while contacting the substrate with an inert atmosphere containing less than 10 parts per million of oxygen, maintained at such peak temperature for a specified period of time while being contacted with said inert gas, and thereafter heated at a peak temperature of at least about 800 degrees centigrade while being contacted with a gas containing at least 100 parts per million of oxygen.

Abstract: A low profile transformer comprises a support member for supporting a coil winding, a first elongated conductive tape forming at least one conductor having lead terminals formed integral therewith formed into a first coil of multiple turns, a second elongated conductive tape having lead terminals formed integral therewith forming at least one conductor formed into a second coil of at least one turn interleaved with the first coil, and each terminal lead of each of the tapes extending from the support member and having a portion disposed at a base of the transformer for engagement and surface bonding to a PC board.

Abstract: In a high-voltage transformer for the power supply of a magnetron in a microwave oven, of the type comprising a primary coil, a high-voltage secondary coil and a heater secondary coil, the two secondary coils are superimposed by being wound on a casing that comprises three parallel flanges, two flanges for the winding of the high-voltage coil and one additional flange which, with one of the preceding flanges, enables the winding of the heater coil.

Abstract: An inductive structure is provided which displays an increased self-inductance and improved Q at high frequencies. The improvement resides in the disposition proximate the inductive structure an amount of magnetic material to increase mutual inductance between adjacent portions of the inductor's conductive path with current flow.

Abstract: A differential type sensing unit which includes a winding core having a winding shaft is described. In one embodiment, a post extends from the winding shaft and is located intermediate first and second winding ends of the winding shaft. The post facilitates reversing the winding direction of a conductor wound on the winding shaft. The conductor is wound such that the sensing unit includes a first sensing coil and a second sensing coil formed in a series opposing configuration. The sensing unit may be integrated with a driving unit to include driving coils formed over the top of the sensing coils.

Abstract: A transformer having a very low, predetermined leakage inductance includes an elongate dielectric laminate having two surfaces. A primary winding having a pattern conformal to the configuration of the laminate is disposed on one surface and extends substantially the length of the laminate. The laminate has at least one secondary winding disposed on its other surface. The laminate is rolled with a dielectric layer about a cylinder, and the primary and secondary windings are patterned such that the primary and secondary windings comprise interleaved winding layers with the dielectric layer disposed between each of the winding layers. The rolled laminate, dielectric layer, and windings are contained within a cylindrical magnetic pot core. The result is a transformer having tightly interleaved primary and secondary windings and, therefore, a very low leakage inductance.

Abstract: Main and supplemental windings are combined in a toroidal inductor to subntially nullify Lorentz Forces on the main winding and the magnetic field thereof which passes externally from the inductor.

Abstract: The internal and/or external magnetic fields of a coil are nullified to ad structurally detrimental Lorentz Forces and/or environmentally hazardous magnetic fields, in accordance with preestablished design objectives.

Abstract: A transformer or coupled inductor with any arbitrary turns ratio (for example, non-integral), and optionally with multiple secondary windings, has primary and secondary windings interleaved on the same winding layer, preferably around a magnetically permeable or an air core. This is capable of giving optimum magnetic coupling, minimum leakage fields and negligible proximity effect losses. The electrical turns ratio is determined by series or parallel, or combination series-parallel, connections of the physical turns of each winding.

Abstract: A low profile transformer comprises a support member for supporting a coil winding, a first elongated conductive tape forming at least one conductor having lead terminals formed integral therewith formed into a first coil of multiple turns, a second elongated conductive tape having lead terminals formed integral therewith forming at least one conductor formed into a second coil of at least one turn interleaved with the first coil, and each terminal lead of each of the tapes extending from the support member and having a portion disposed at a base of the transformer for engagement and surface bonding to a PC board.

Abstract: A ferromagnetic material (18,20) in ink or tape form is sinterable using a same firing profile as and has approximately the same thermal shrinkage characteristics as low-temperature-cofired-ceramic (LTCC) tape, and is chemically non-reactive therewith. The ferromagnetic material (18,20) is applied to the surfaces of LTCC tape sheets (12,14,16) to form desired elements such as cores for inductors (22) and transformers and magnetic shields. Ferromagnetic vertical interconnects (vias) (54) can be formed by punching holes (56) through tape sheets (46) and filling them with ferromagnetic ink. The tape sheets (12,14,16) and ferromagnetic elements (18,20) are laminated together and cofired to form an integral structure (10). Ferromagnetic and non-magnetic components (114) can be fabricated separately and inserted into cavities (104a,-106a,108a) in tape sheets (104,106,108) prior to cofiring.

Abstract: A printed coil, having good magnetic coupling, low loss, and good high frequency characteristics, comprises a plurality of conductor forming planes on which a conductor pattern having one or more turns are formed centered about a core inserting hole and which are laminated together with an insulating layer, each of the conductor forming planes being provided with outer peripheral connecting holes provided on an outer periphery of the conductor pattern, and a plurality of inner peripheral connecting holes provided on an inner periphery thereof, with the outer and inner peripheral connecting holes being connected to the conductor pattern; a connecting coil which is laminated together with the conductor forming planes and having a connection pattern thereon for connecting the outer and inner peripheral connecting holes, and circuitry for electrically connecting the outer and inner peripheral connecting holes and the connecting coil.

Abstract: A transformer designed for 1:N voltage transformation (where 1:N may be any rational number) at high frequencies (such as over 7 megahertz) can achieve acceptable frequency response and attendant improved values of signal attenuation and signal distortion by physically separating two or more sets of electrically tightly coupled windings and connecting one winding of different sets in parallel and the other winding of the same sets in series. This interconnection of windings to achieve a 1:N transformation ratio reduces the negative effects of the interwinding capacitance thereby providing the improved frequency response.

Abstract: An output transformer for use with a push-pull vacuum tube amplifier using a multifilar ribbon in which primary windings and secondary windings co-exist. The multifilar ribbon is wound continuously around a common core side-by-side to form successive layers. The primary windings are connected in series by turning the multifilar ribbon after the layers of multifilar ribbon have been wound and connecting the turned end of the multifilar ribbon to the beginning end of the multifilar ribbon. The winding scheme increases the coupling between the first half primary, the second half primary and the secondary without reducing performance at high frequencies. The secondary windings are connected in series or in parallel to obtain the proper turns ratio for the transformer. A method of interconnecting the secondary windings for different turns ratios is also provided.

Abstract: A constant wattage ballast transformer of the isolated type permitting the electrical grounding of a mounting shell of the lamp it powers in which a primary, secondary and auxiliary winding are provided with the primary winding inducing voltage into the auxiliary and secondary windings while being electrically isolated from both these windings and the auxiliary winding electrically connected to the secondary winding to add its induced voltage to that directly induced in the secondary winding from the primary winding.

Abstract: An improved narrow profile transformer and method of making is disclosed comprising a primary winding and a secondary winding with the secondary winding being interleaved with the primary winding. The primary and secondary windings are spiral winding with all portions of the primary and secondary windings intersecting a geometric plane extending through the narrow profile transformer. The primary and secondary windings of the narrow profile transformer may be encapsulated within a polymeric material.

Abstract: The primary windings and part of the magnetic circuit of an automobile battery charging transformer are mounted in a separable multiple panel inductive charge coupler which is insertable into and removable from corresponding inductive charge receptacle slots in the automobile adjacent the transformer secondary windings and magnetic structure. The use of thin primary and secondary coils decreases the resistance losses in the coils. When the inductive charge coupler is in place and is energized, the primary winding energizes the secondary winding to permit charging of the batteries on the automobile.

Abstract: A pancake-type transformer particularly suited for connection to an inductor for inductively heating crankshafts is comprised of a single turn secondary defined by a plurality of generally U-shaped tubular conductors interleaved between the turns of a tubular, multiturn primary conductor having opposite ends connectable across a source of power. The conductors of the secondary have opposite ends each interconnected with a corresponding one of a pair of terminal blocks connected to a tubular inductor. The terminal blocks are outwardly adjacent the primary and secondary conductor portions at one end of the transformer and include corresponding current collectors which extend inwardly across the opposite sides of the conductor portions at the one end of the transformer. Coolant for flow through the secondary conductors is communicated with the opposite ends thereof through coolant passageways in the current collectors.

Abstract: A low-profile, conductive film transformer includes a conductive film primary winding and a multi-turn, conductive film secondary winding. The multi-turn secondary winding is configured on a continuous secondary conductive film which is disposed on at least one surface of a secondary dielectric membrane and has at least two portions arranged as mirror images of each other. Each of the portions has a plurality of sections; and each of the sections includes an even number of apertures, each of the apertures corresponding to a separate respective magnetic pole. There are at least two adjacent poles per section along at least one longitudinal pole axis. The conductive film is z-folded to form a stack of winding layers with a single turn per two adjacent layers about each magnetic pole, each layer comprising one section of the winding.

Abstract: An improved narrow profile transformer and method of making is disclosed comprising a primary winding and a secondary winding with the secondary winding being interleaved with the primary winding. The primary and secondary windings are spiral winding with all portions of the primary and secondary windings intersecting a geometric plane extending through the narrow profile transformer. The primary and secondary windings of the narrow profile transformer may be encapsulated within a polymeric material.

Abstract: A transformer and associated rectifier for supplying low voltage (e.g. 5 volts), high current (e.g. 1,500 amperes) power to a load such as a supercomputer, with a high electrical conversion efficiency and a high volumetric efficiency. The primary winding comprises a number of disc-shaped coils which are spaced apart from each other by coaxial single turn secondary coil elements which are interleaved between the primary coils. A core having E-shaped parts has an inner portion extending through the primary and secondary coils and an outer portion forming two windows with the inner portion, so that the coils extend through the windows. A rectifier assembly is mounted directly to plates which support and act as terminals to the secondary coils.

Abstract: Solenoid coils are provided that produce relatively low irradiation of electromagnetic fields with intense fields internally thereof for purposes of heating a metallic element, preferably a ferromagnetic element having a Curie temperature selected for the purpose for which the coil structure is to be employed, the coil structure in one embodiment comprising two coaxial coils of substantially equal diameter interconnected to produce in response to an alternating current being applied thereto out of phase magnetic fields that do not substantially interfere with one another as a result of the spacing between the coils. In a second embodiment the two coils are located between two additional coils that buck axial fields thereby together with fall off of the fields as the cube of the distance from the main coils provide a structure with low external radiation.

Abstract: A high-frequency, low-profile transformer having at least one pair of magnetic poles includes a primary winding having a z-folded, continuous primary conductive film with a generally serpentine configuration disposed on a primary dielectric membrane and further includes a z-folded, continuous secondary winding constructed from a plurality of secondary conductive film portions disposed on a secondary dielectric membrane. Each of the secondary conductive film portions is configured to form a single continuous path enclosing each of the magnetic poles in such manner that each path encloses one pole of each pair of the magnetic poles of each adjacent layer of the secondary winding. Each path thus continues along a respective fold of the winding stack. The secondary winding layers are interleaved with the primary winding layers and electrically connected together.

Abstract: Transformer coil consisting of an insulating ribbon comprising electrically conducting patterns making it possible to produce paralleling of the patterns when this ribbon is accordion folded.According to the invention, one side of the insulating ribbon (25) alternately comprises one face (34; 36) with pattern (26; 27) and one face (35; 37) without pattern, each pattern (26, 27) comprising two paralleling pads (28, 29; 30, 31) prolonging each of its extremities beyond a separation line (P1, P3) in order to overlap onto the face (35; 37) without pattern in such a way that the paralleling pads (28, 29; 30, 31) of each pattern (26, 27) come into electrical contact with the extremities of the neighbouring pattern (26, 27) when the ribbon (25) is accordion folded, in such a way as to produce paralleling of the patterns (26, 27).The invention applies especially to the production of high-frequency transformers used in switched-mode power supplies.

Abstract: A flyback transformer includes at least one primary coil and at least one secondary coil formed thereon. Each primary and secondary coil may be a metal plating coil with an insulating bobbin and a conductor formed thereon. Secondary coils may be formed of pairs of metal plating coils connected in series. One to three primary coils may have secondary coils sandwiched therebetween. The transformer may also have a resonance capacitor integrally formed therein, and may have respective rectifying diodes connected between the secondary coils.

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: Turns of primary and secondary windings of a chopper power supply transformer are formed by magnetically coupled stacked parallel planar printed circuit conducting layers. The primary winding is between first and second parts of the secondary winding that are connected in series and parallel. Layers at opposite ends of the primary winding are (i) arranged to reduce leakage currents between the secondary winding parts and (ii) positioned between further layers of the primary winding and the secondary winding. Terminals of the first and second layers are connected together as a first input terminal of the transformer. Other terminals of the first and second layers have a common connection. Further layers of the primary winding are connected in series with each other between the common connection and a second input terminal of the transformer.