51results about "Broad-band transformers" patented technology

A balun comprises an unbalanced terminal, two balanced terminals, and two ground terminals. The balun further comprises: a low-pass filter provided between the unbalanced terminal and one of the balanced terminals; and a high-pass filter provided between the unbalanced terminal and the other of the balanced terminals. The low-pass filter incorporates two coils and a capacitor. The high-pass filter incorporates two capacitors and a coil. The coils and the capacitors are made up of conductor layers of a multi-layer substrate.

A mode-switching transformer having a first conductive line formed of two primary windings electrically in series, and the length of which is a function of a central operating frequency of the transformer; and a second conductive line formed of two secondary windings electrically in series, coupled two-by-two with the primary windings, the length of which is a function of said central frequency. The conductive lines exhibit different widths selected according to the desired impedance ratio of the transformer.

There is provided a balun transformer, in which first to fourth layer coils are stacked and coupled magnetically; one end of each coil of the first to fourth layer coils is grounded; the second and third layer coils are connected in parallel, an unbalanced signal is input / output to / from a common terminal of the second and third layer coils; a first balanced signal is input / output to / from the other end of the first layer coil; and a second balanced signal is input / output to / from the other end of the fourth layer coil.

A multilayer transformer component includes a chip body including a primary-side coil and a secondary-side coil, and first to fourth external electrodes. The primary-side coil includes a body portion, a first lead, and a second lead, and the secondary-side coil includes a body portion, a third lead, and a fourth lead. A first projection and a second projection of each body portion are arranged to lie substantially on a linear line. The first lead and the fourth lead are arranged to be line-symmetrical with respect to a center line which is arranged at an approximate center between respective distal ends of the first projection and the second projection, and which is perpendicular or substantially perpendicular to an overlying direction of the primary-side and secondary-side coils. The second lead and the third lead are also arranged to be line-symmetrical with respect to the center line.

An embedded transformer device includes first, second, and auxiliary windings, defined in an insulating substrate by conductive vias joined together by conductive traces. The positions of the conductive vias are arranged to optimize the isolation properties of the transformer and to reduce the coupling of the transformer by increasing the leakage inductance. The embedded transformer device provides better isolation between input side and output side windings, and allows an oscillating LC circuit to be set up in the case of a short circuit, preventing high power from extending between the input and output terminals and thereby avoiding damage to the connected electrical components.

A radiofrequency power amplifier (60), comprising a balun transformer and a plurality of power transistor pairs (61, 62) arranged in a push-pull configuration. The balun transformer comprises an unbalanced coil (14) extending between a first single-ended signal terminal (142) and a first reference (141), and a balanced coil (11) extending between a first balanced signal terminal (111) and a second balanced signal terminal (112). The balun transformer further comprises at least one auxiliary coil (12) electrically isolated from the unbalanced coil and the balanced coil. The at least one auxiliary coil is inductively coupled to the unbalanced coil (14) and extends between a third balanced signal terminal (121) and a fourth balanced signal terminal(122) forming a balanced combiner-divider.An output of a first one of the plurality of power transistor pairs (61, 62) is coupled to the first and second balanced signal terminals (111, 112) and an output of a second one of the plurality of power transistor pairs (61, 62) is coupled to the third and fourth balanced signal terminals (121, 122).

A common mode filter arrangement for regulating aspects of power conversion by a power converter from an external source, such as a solar panel, to another external circuit, wherein the common mode filter arrangement substantially attenuates The switching frequency of the power converter plus the common-mode voltage at harmonics, and wherein the common-mode filter arrangement has a series connection with the power converter to support the common-mode voltage difference between the power converter ports and divide the common-mode current common-mode filter controlled at acceptable levels. The power converter may be single-phase, but is preferably multi-phase.