JP2005093784A - Transformer parts with choke coils - Google Patents

Abstract

【Task】
Disclosed is a transformer component with a choke coil that can be reduced in size and thickness and improved in crosstalk characteristics.
[Solution]
The case of the transformer component with the choke coil is formed in a substantially rectangular shape, and the pulse transformers T1 and T2 are arranged apart from each other by a predetermined distance in the longitudinal direction of the case. Are arranged in the case in proximity to the central part of each.
[Selection] Figure 1

Description

The present invention relates to a transformer component with a choke coil, and more particularly to a transformer component with a choke coil used for signal transmission in a LAN (local area network), communication between a computer and communication between data terminals, and the like.

2. Description of the Related Art Conventionally, a transformer component with a choke coil has been used for signal transmission in a LAN, communication between a computer and a data terminal. FIG. 4 is a diagram of appearance and components showing a conventional transformer component with a choke coil, 11 is an entire transformer component with a choke coil, 12 and 13 are communication circuits, T1 and T2 are pulse transformers, L1 and L2 are Choke coils, 15a to 15d are external connection terminals for connecting wires to an external circuit, and 14 is a case in which these are arranged. The choke coil-equipped transformer component 11 includes communication circuits 12 and 13. The communication circuit 12 includes a pulse transformer T1 and a choke coil L1, and the communication circuit 13 includes a pulse transformer T2 and a choke coil L2. Communication circuits 12 and 13 are spaced apart by a predetermined distance to improve crosstalk.

Next, the operation will be described. The pulse transformers T1 and T2 electrically isolate and insulate the device side and the communication line side, respectively, and the choke coils L1 and L2 generate common mode noise (the same potential with respect to the ground on the two lines). Noise).

In recent years, such a transformer component with a choke coil has been required to be thin and to occupy a small area in order to be incorporated into a portable computer or a PC card that is becoming smaller and thinner. However, if the component parts of a conventional transformer part with a choke coil are simply reduced in size by reducing the arrangement interval, the upper limit of the communication frequency is as high as several MHz to several hundred MHz, so that electrical coupling is established between two communication circuits. Occurs, and the crosstalk characteristic is deteriorated. The present invention has been made to solve such problems. All the components are arranged in close contact with each other, and the crosstalk characteristics can be improved while reducing the size and thickness. An object is to provide a transformer component with a choke coil.

In order to achieve the above object, in the transformer part with a choke coil according to claim 1, the case is formed in a substantially rectangular shape, and the pulse transformers of the two communication circuit systems are arranged apart from each other by a predetermined distance in the longitudinal direction of the case. The choke coils of each of the two communication circuits are arranged in the case in the vicinity of the central part of each long side of the case.

In order to achieve the above object, a transformer component with a choke coil according to claim 2 is the transformer component with a choke coil according to claim 1, wherein a plurality of terminals are divided into two groups on the long sides of the case. It is characterized by making it.

According to the first aspect of the present invention, there is provided a transformer component with a choke coil in which the pulse transformers of each of the two communication circuit systems are arranged apart from each other by a predetermined distance in the longitudinal direction of the case. By arranging in the case close to the central part of each of the long sides, it is possible to arrange all the components in close proximity and improve the crosstalk characteristics while reducing the shape.

The transformer part with a choke coil according to the invention of claim 2 is configured such that a plurality of terminals are divided into two groups and spaced apart from each other on the long sides of the rectangular storage surface case of the case. The components can be placed in close contact with each other to reduce the shape.

The invention of claim 1 will be described. 1 and 2, pulse transformers T1 and T2 among the components of the communication circuits 12 and 13 of the choke coil-equipped transformer component 11 particularly affect the deterioration of the crosstalk characteristics. The crosstalk characteristics between the communication circuits 12 and 13 can be improved by disposing them apart from each other. By arranging the choke coils L1 and L2 having a small influence on the crosstalk characteristics between the pulse transformers T1 and T2 separated by a predetermined distance, all the components are brought into close contact with each other while improving the crosstalk characteristics. It can be arranged and the occupied area can be reduced.

The crosstalk characteristics of such a choke coil-equipped transformer component 11 are as shown in FIG. (B) is a characteristic when the pulse transformers of the two communication circuit systems are brought close to each other. According to the present invention, the crosstalk characteristics are improved by about 8 dB over the entire area while arranging all the components in close contact.

The invention of claim 2 will be described. In FIG. 1, by arranging the external connection terminals 15 a to 15 d on the long sides of the case 14, all the components can be arranged in close contact with each other to reduce the shape.

It is a figure of the typical external appearance and component in a transformer component with a choke coil of the present invention. It is a typical circuit diagram in the transformer component with a choke coil of the present invention. It is a comparison graph of a crosstalk characteristic. It is a figure of the typical external appearance and component in the transformer component with a conventional choke coil.

Explanation of symbols

T1 pulse transformer T2 pulse transformer L1 choke coil L2 choke coil 11 transformer part with choke 12 communication circuit 13 communication circuit 14 case 15a external connection terminal 15b external connection terminal 15c external connection terminal 15d external connection terminal

Claims (2)

In a transformer component comprising two toroidal transformers, two choke coils, and a case for housing them, the case is formed in a substantially rectangular shape, and the two toroidal transformers are respectively arranged in the longitudinal direction of the case. A transformer part with a choke coil, wherein the two choke coils are arranged in the case so as to be close to the central part of each long side of the case. 2. A transformer component with a choke coil according to claim 1, wherein a plurality of terminals are divided into two groups and arranged apart from each other on the long side of the case.

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