361 results about "Planar transformers" patented technology

The present invention describes a planar transformer having a plurality of juxtaposed magnetic cores as well as a two-layer printed circuit board for spiralling a plurality of windings. Each arm of a plurality of juxtaposed magnetic cores respectively goes through a corresponding hole in the middle of these windings, to magnetically couple the current in the main winding to the other windings.

A power converter integrates at least one planar transformer comprising a multi-layer transformer substrate and/or at least one planar inductor comprising a multi-layer inductor substrate with a number of power semiconductor switches physically and thermally coupled to a heat sink via one or more multi-layer switch substrates.

A planar coil including and insulating substrate, and a coil conductive filament having a thickness of 20 to 400 mum and formed on at least one surface of the insulating substrate, the coil conductive filament having a gap whose aspect ratio (H/G) is at least 1. The coil conductive filament has a cross-section in a substantially mushroom shape having a head and a neck, the head has a width (L) which is a least twice as large as a width (l) of the neck thereof, at most 1.5 times as large as a height of the head, and at least twice as large as a minimum spacing (G) between adjacent coil conductive filaments.

A battery backup and charging device (BBCD) is described. The BBCD includes a battery, a charger coupled to the battery, AC prongs coupled to the charger, and a connection module adapted to connect the battery and charger to the mobile device. The charger may provide charging to the battery and an internal battery of the mobile device in parallel. The BBCD and mobile device may be enclosed in a single housing. The charger may include a planar transformer.

A method of arranging and fabricating parallel primary and secondary coils of a wideband planar transformer is provided. The spacing and width of the coils are disposed to extend the bandwidth from DC to GHz and allow for high frequency coupling when the core permeability dramatically drops and achieves low reflected energy and low loss over a wide bandwidth. A bottom mold having a pattern of hole-pairs with conductive elements inserted vertically couples to a top mold such that a middle portion of the conductive elements spans between the top and bottom molds. Dielectric material envelopes the middle portion and a displacement feature of the mold creates a vacancy. A ferrite element is deposited to the vacancy. A second top mold spans the bottom mold and dielectric material is deposited to create a molded assembly. A deposited patterned conductive coating connects the element ends to define the transformer coils.

A planar transformer comprises a primary coil board including a primary coil, a secondary coil board including a secondary coil, a heat sink integrally having a spacer portions and a magnetic core assembly mounted to the primary coil board and the secondary coil board. The spacer portion is inserted into a gap between and facing the primary coil board and the secondary coil board and at least a surface of the heat sink is electrical insulating.

A planar transformer suitable for intrinsically safe electronic circuits with a core, a first printed circuit board and a second printed circuit board. The first printed circuit board has a first winding and the second printed circuit board has a second winding. The planar transformer can be produced at a low cost and is compact, but is still suitable for connection to intrinsically safe operating circuits is implemented by at least one gap being asymmetrically split on the first printed circuit board and the second printed circuit board.

An apparatus and method for reducing common mode noise capacitive coupling from a primary winding to a secondary winding in a transformer. In an embodiment, the primary winding has two terminals and a plurality of coil turns therebetween formed by a plurality of PCB layers sandwiched together, each having at least one of the coil turns formed thereon. The coils turns on each PCB layer are connected in a predetermined way to form the primary winding. Each terminal of the primary winding is connected to a coil turn on a separate corresponding PCB layer. The PCB layers are stacked layers to form the primary winding. The secondary winding or windings are positioned adjacent to a selected one of the stacked PCB layers that is in a position in the stack substantially midway between the first and second PCB layers. Preferably, the PCB layer closest to the secondary winding is comprised of only one coil turn so as to further minimize the common mode noise. In an alternative embodiment, the transformer windings are positioned in a secondary-primary-secondary arrangement wherein two halves of the primary winding are combined into one PCB winding. Alternatively, the present invention may be used for a planar matrix transformer.

A planar coil includes a winding of N turns (N is an integer greater than or equal to 2). Letting r_i(n) be a radius of an inner circumference of a winding portion at the n^th turn (n is an integer greater than or equal to 1 and less than or equal to N) from the inner side; r_o(n) be a radius of an outer circumference of the same; r_min be a radius of an inner circumference of the innermost winding portion; W_total be a difference between a radius of an outer circumference of the outermost winding portion and the radius of the inner circumference of the innermost winding portion; and D be a distance between winding portions at adjacent turns, the r_i(n) and r_o(n) are determined so as to minimize a value of A expressed by equation (1) when the r_min, W_totla and D are given. $\begin{array}{cc}A=\sum _{n=1}^N{\left(\log \frac{r_o\left(n\right)}{r_i\left(n\right)}\right)}^{-1}& \left(1\right)\end{array}$

The invention discloses a planar transformer and a magnetic core thereof. The magnetic core comprises an upper magnetic core and a lower magnetic core; the upper magnetic core comprises a quadrangular flat plate, and four triangular flat plates which are arranged on four sides of the quadrangular flat plate and have the same thickness and the same material; a square or rectangular upper magnetic core is formed by splicing the quadrangular flat plate with the triangular flat plates; the lower magnetic core is an integrated structure having a shape which is consistent with that of the upper magnetic core; an annular groove is arranged on the lower magnetic core; a raised cylinder is disposed in the centre of the annular groove; two groove clamps are arranged on the lateral surface of the cylinder; and the entire magnetic core is formed by buckling the upper magnetic core with the lower magnetic core together. By employing the planar transformer and the magnetic core thereof, the filtering effect and the EMI (Electro-Magnetic Interference) effect of the transformer can become better by means of a distributive capacitor; in the transformer with the structure, not only is a magnetic circuit shortened but also the magnetic circuit distribution is more uniform; and the structure can also be lowered in vortex loss, and effective in heat-radiating and magnetic-conducting performances.

A power inverter comprises a plurality of high power switching modules that form an alternating current (AC) output; a plurality of terminals in communication with the high power switching modules for outputting the AC output; a capacitor bank that provides a conditioned voltage to the high power switching modules for producing the AC output in response to receiving and storing electrical energy related to a direct current (DC) supply; and a case positioned over the high power switching modules. The capacitor bank is mounted to the case, and the capacitor bank is positioned over the high power switching modules so that the high power switching terminals are proximal the capacitor bank for reducing inductance. A gate driver module at a top region of the high power switching modules includes a plurality of planar transformers for reducing a distance between the capacitor bank and the gate driver.

A wiring method is provided, in which a wire conductor is stuck on a surface of a substrate by causing a three-dimensional relative movement between a wiring head (2) for guiding the wire conductor (5) and the substrate (11) such that the wiring head relatively moves along an adhesive layer (12) on the surface of the substrate and the wiring head and the adhesive layer intermittently come close to each other for point contact. A wiring apparatus for carrying out the wiring method includes a table (1) for supporting the substrate, a wiring head arranged for reciprocating motion between a close position in which the wiring head can be in point contact with the adhesive layer and a distant position in which the wiring head is most distant from the adhesive layer, and a moving mechanism (3) for causing a translational motion of the wiring head along the surface of the substrate under the control of a control section (4). The wire conductor is stuck onto the surface of substrate point by point, to be laid thereon, whereby a planar transformer, an antenna coil or a conductor pattern is formed on the substrate.

A planar transformer includes first and second windings that may be comprised of electrically conductive traces etched onto one or more printed circuit boards. The printed circuit boards may be arranged in various orientations so as to change the turns ratio of the planar transformer. In one embodiment, the printed circuit boards are substantially similar and may be electrically connected via connectors that separate the circuit boards. Insulating sleeves may be inserted between the printed circuit boards in an interleaved configuration.