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Balun transformer using a drum-shaped core

A balanced transformer, balanced technology, applied in the direction of broadband transformer, transformer/inductor coil/winding/connection, etc., can solve the problem of characteristic change, difficult to obtain amplitude balance phase balance, difficult to obtain high frequency characteristics, etc., to achieve good high frequency characteristics, good amplitude balance and phase balance characteristics, high symmetry effect

Active Publication Date: 2009-10-28
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in a balun using a drum core, its characteristics change significantly depending on the winding method of the secondary winding, so it is difficult to obtain good high-frequency characteristics
Especially in the high-frequency region, it is difficult to obtain good amplitude balance (amplitude balance in a balanced signal) and phase balance (phase balance in a balanced signal)

Method used

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  • Balun transformer using a drum-shaped core
  • Balun transformer using a drum-shaped core
  • Balun transformer using a drum-shaped core

Examples

Experimental program
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Effect test

no. 3 approach

[0086] Figure 15 is a schematic perspective view showing the appearance of the balun according to the third embodiment. Figure 16 is a schematic cross-sectional view of a balun according to a third embodiment, and Figure 17 is a schematic bottom view of the balun according to the third embodiment viewed from the mounting surface side.

[0087] Such as Figure 15 to Figure 17 As shown, a balun 300 according to the third embodiment is composed of a drum-shaped core 310, a plate-shaped core 320, and three winding wires 331-333. The drum core 310 includes a core unit 311 and a pair of flanges 312 and 313 disposed on both sides of the core unit 311 . The drum-shaped core 310 and the plate-shaped core 320 correspond to the drum-shaped core 110 and the plate-shaped core 120 in the balun 100, and thus the materials thereof are also the same as those described above.

[0088]One flange 312 of the drum core 310 is provided with two terminal electrodes 341 and 342 , and the other ...

Embodiment

[0130] Although the embodiments of the present invention are explained below, the present invention is not limited thereto.

[0131] First, prepare according to having Figure 1-Figure 3 The configuration shown is an embodiment of the balun and according to the Image 6 A comparative example balun of the configuration shown. As described above, the winding wires 132 and 133 constituting the secondary winding in the balun according to this embodiment are wound by the bifilar winding method, while constituting the secondary winding of the balun in the comparative example The winding wires 132 and 133 are wound by a fan winding method. The only difference between the two examples is the method of winding the secondary winding, while the rest of the features are the same. Note: In both cases, NiZn ferromagnetic is used as the material for the drum and plate cores.

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PUM

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Abstract

A balun transformer includes: a drum-shaped core having a core unit and a pair of flanges arranged on both sides of the core unit; a plurality of terminal electrodes arranged on the flanges; a primary winding wound around the core unit, both ends of the primary winding being connected to the terminal electrodes; and a secondary winding wound around the core unit, both ends and a center tap of the secondary winding being connected to the terminal electrodes, wherein the secondary winding includes a first wire extending from one end to the center tap, and a second wire extending from the other end to the center tap, and the first wire and the second wire are wound around the core unit so as to extend along each other.

Description

technical field [0001] The present invention relates to balun transformers, and more particularly to a balun transformer using a drum-shaped core. Background technique [0002] A transmission line connected to an antenna etc. is generally an unbalanced transmission line, and a transmission line connected to a high-frequency circuit (such as a semiconductor IC) is a balanced transmission line. Therefore, when connecting an unbalanced transmission line and a balanced transmission line, a balun transformer that converts an unbalanced signal and a balanced signal to each other is inserted between the transmission lines. In this case, an unbalanced signal refers to a single-ended signal referenced to a fixed potential, such as ground potential, while a balanced signal refers to a differential signal. [0003] A balun using a spectacle-shaped core described in Japanese Patent Application Laid-Open No. H11-135330 and a balun using a toroidal core described in Japanese Patent Appli...

Claims

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Application Information

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IPC IPC(8): H01F19/06H01F27/28H01F27/30H01F27/29
Inventor 友成寿绪铃木宽黑嶋敏浩
Owner TDK CORPARATION
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