JPH02201909A - Surface mounting type vertical current transformer and manufacture thereof - Google Patents

Abstract

PURPOSE:To isolate a distance between terminals and to secure an insulation distance by forming a pin terminal of one-turn coil and a secondary coil in a lead frame shape in advance, by forming a vertical bobbin provided with a core in the longitudinal direction and by molding the one-turn coil and the pin terminal simultaneously in a one-piece structure during bobbin formation. CONSTITUTION:A pin terminal 4 of one-turn coil 5 and one multi-winding secondary coil is formed in advance in a continuous shape of a lead frame 9. A core tube 1 is formed so that a central groove of a bobbin whereto a core 7 is inserted is in a vertical direction to a formation surface of the pin terminal 4 and the one-turn coil 5, and the bobbin 10 is formed vertically. Winding is applied with the bobbin 10 attached to the lead frame 9. After a winding end is entwined with the pin terminal 4 and soldered, a connecting section with the lead frame 9 is cut off. After a terminal is formed, the core 7 is incorporated to hold the core 7 and the bobbin 10 by a core holder 8 as a current transformer. Thereby, an insulating distance among the one-turn coil 5, a pin terminal 4, and the core 7 is maintained.

Description

Detailed Description of the Invention A. Object of the Invention [Field of Industrial Application] The present invention relates to a current transformer used in electronic equipment to detect a current flowing in a circuit, and the present invention relates to a structure of a surface mount type vertical current transformer. , and a method for manufacturing a surface-mounted vertical current transformer.

[Conventional technology]

FIG. 3 is a perspective view of a conventional current transformer, and FIG. 4 is an exploded perspective view of the conventional current transformer.

A plurality of pin terminals 4a are provided on the flanges 2 provided at both ends of the winding core 1 on which the winding is wound, and a U-shaped primary coil 5a forming a one-turn coil is embedded in the other flanges 3. This is a one-turn coil and a current transformer bobbin with a pin terminal, but the winding is tied to the pin terminal 4a and the winding core 1
Roll! Step a12 is performed to make a secondary coil, and the end of the winding is tied to the pin terminal 4a, soldered, and the core 7 is butted against the center groove 6 of the winding core 1 from both sides. It was a current transformer with a structure that fixed the .

[Problem to be solved by the invention]

In current transformers using conventional technology, the 1-turn coil, the secondary coil, and the core are close to each other, making it impossible to secure insulation distance, and the U-shaped 1-turn coil is expensive and retrofitted. When the coil is mounted on the winding frame, there are also problems such as the winding frame being destroyed by the tip of the coil or the like.

Structure of the Invention [Means for Solving the Problem] A bottle terminal connecting a first turn coil and a secondary coil is preformed into a lead frame shape, and a vertical bobbin with a core arranged vertically is formed. - When molding the bobbin, by molding the one-turn coil and the pin terminal at the same time, the distance between the terminals is separated to ensure insulation distance, and an inexpensive bobbin for a current transformer is formed. A core with a high relative magnetic permeability characteristic is inserted into the core to form a closed magnetic path, and the core and bobbin are locked with a core holder to obtain a surface-mount type vertical current transformer of the present invention.

That is, the present invention has the following features: 1. A U-shaped one-turn coil surrounding the central groove of the winding core is formed on the lower flanges of a winding frame having thick flanges at both upper and lower ends of a cylindrical winding core, and the one-turn A core with high relative magnetic permeability is incorporated into a bobbin which has a pin terminal for winding a secondary winding coil formed in the opposite direction of the coil, and the core and bobbin are held together by a core holder. Surface mount type vertical current transformer.

2. Form the pin terminal that connects the U-shaped one-turn coil and the secondary winding coil in the form of a lead frame in advance, so that the direction of the center groove of the cylindrical winding core is oriented perpendicular to the direction of the pin terminal. After integrally molding the bobbin with the lead frame, winding is performed on the cylindrical winding core of the bobbin, and the end of the winding is soldered to the pin terminal, after which the one-turn coil and the pin terminal are cut from the lead frame. , a method for manufacturing a surface-mount type vertical current transformer, characterized in that the terminal terminals are shaped.

[Effect]

In the current transformer according to the present invention, the one-turn coil and the pin terminal of one multi-winding secondary coil are formed in advance into a continuous lead frame shape, and the center groove of the bobbin into which the core is inserted is formed into the one-turn coil. .

The bobbin is formed vertically by molding the winding core so that it is perpendicular to the pin terminal molding surface, and the winding is performed with the bobbin attached to the lead frame, and the winding end is tied to the pin terminal. After soldering, the connection to the lead frame is cut, the terminal is molded, the core is assembled, and the core and bobbin are held by a core holder to form a current transformer.

Compared to conventional bobbins, the current transformer bobbin according to the present invention also maintains an insulation distance between the one-turn coil, the pin terminal, and the core.

〔Example〕

FIG. 1 is a perspective view of a current transformer according to the present invention, and FIG. 2 shows a one-turn coil 5, a bobbin 10 molded with resin on a lead frame 9 on which a pin terminal 4 has been molded in advance, and a winding 12 attached to the core. A perspective view of the molded product is shown.

In Figures 1 and 2, when the core is inserted into one of the flanges 3 of the winding frame, which has thick flanges 2 and 3 at both the upper and lower ends of the cylindrical winding core 1, the core A U-shaped 1 is attached to a lead frame 9 made of copper, copper alloy, iron-nickel alloy, etc.
A turn coil 5 and a pin terminal 4 consisting of a lead frame 9 are formed in advance on the opposite side, and then a U-shaped terminal 4 is formed on the opposite side.
A bobbin 10 including a turn coil and a pin terminal is integrally formed by resin molding, the winding end is tied to the pin terminal 4, the winding core 1 is wound, and the winding end is tied to the pin terminal 4. The core 7 is fixed by soldering, and the core 7 having a high relative permeability characteristic is butted against the top and bottom of the center groove 6 of the winding core 1, and the core and bobbin are fixed with a core holder, tape, etc. to form a current transformer.

C9 Effects of the invention [Effects of the invention] When the current transformer of the present invention described above is used, 1
The insulation distance between the U-shaped one-turn coil of the secondary terminal and the pin terminal and core of the multi-turn coil of the secondary terminal is maintained, and the bobbin is no longer destroyed when the one-turn coil is inserted.

In addition, the central groove of the winding core, which is the greatest feature of the present invention, is vertical with respect to the lead frame, making it possible to wind and assemble the wire while connected to the lead frame. A transformer can be formed.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a current transformer according to the present invention. FIG. 2 shows a perspective view of manufacturing a bobbin according to the present invention. Figure 3 is a diagonal diagram of a conventional current transformer. FIG. 4 shows an assembled perspective view of a conventional current transformer. 1... Winding core, 2, 3... Tsuba, 4, 4a...-bin terminal, 5.5a... 1 turn coil, 6... Center groove,
7...Core, 8...Core holder, 9...Lead frame, 10.10a...Bobbin, 11, lla
...Current transformer, 12...Winding. Patent applicant Tokin Co., Ltd. Figure 1 Figure 3 Figure 2 Figure 4

Claims (2)

[Claims] 1. A U-shaped one-turn coil surrounding the center groove of the winding core is formed on the lower flanges of the winding frame, which has thick flanges at both the upper and lower ends of the cylindrical winding core, and two turn coils are formed in the opposite direction of the one-turn coil. A surface-mount type vertical current transformer characterized by incorporating a core with high relative magnetic permeability into a bobbin formed with a pin terminal for connecting the next winding coil, and holding the core and bobbin together with a core holder. . 2. A pin terminal connecting a U-shaped one-turn coil and a secondary winding coil is formed in advance in the shape of a lead frame, and a bobbin is installed so that the direction of the center groove of the cylindrical winding core is perpendicular to the direction of the pin terminal. After integrally molding on the lead frame, winding is performed on the cylindrical winding core of the bobbin, and the end of the winding is soldered to the pin terminal.The one-turn coil and pin terminal are cut from the lead frame, and the terminal A method for manufacturing a surface mount type vertical current transformer characterized by having shaped terminals.