JPH0745947Y2 - Bobbin with embedded winding terminal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline of Field] The present invention relates to the structure of a board-mounted bobbin with embedded terminals (hereinafter referred to as bobbin) for use in a current detection transformer.

[Conventional technology]

Conventionally, the bobbin of this type of current detection transformer has only one primary winding wire embedded with one winding of the primary winding,
At the same time, a part of the wire for the primary winding exposed under the bottom of the bobbin was made to function as the primary terminal.
When the current flowing through the primary winding is small and the number of primary windings is only once, the output voltage on the secondary side is low even if the specified load resistance is connected to both ends of the secondary winding. There is. Conventionally, in such a case, in order to increase the secondary side output voltage, adjustment is performed by changing the number of turns of the secondary side winding or the diameter of the wire material to be wound, or the primary side winding is directly connected to the magnetic core. For example, it was wound twice or more and directly connected to the substrate.

[Problems of conventional technology]

In the conventional bobbin for current detection transformer, the primary winding is U
Since it is a V-shaped conductor, when the number of windings is set to 2 or more or the diameter of the conductor is increased, the primary winding must guarantee the withstand voltage characteristics between it and the secondary winding beforehand. Since it is embedded in a bobbin molded with a resin material that has electrical insulation properties for the purpose, the number of windings cannot be increased even if it becomes necessary to increase the number of primary windings after mounting on the board. 1
To connect the primary winding directly to the board by directly winding the secondary winding around the magnetic core, the conventional bobbin that can be directly mounted on the board by resin molding the primary winding and terminals together There was a drawback that the bobbin could not be used and the bobbin could not be used, and was wasted.

[Means for solving problems]

SUMMARY OF THE INVENTION In order to eliminate the above drawbacks, the present invention embeds two or more U-shaped single-turn primary winding wires, which are terminals to be mounted on a board, into a bobbin that is a primary winding. Therefore, by connecting the wiring between the primary side terminals of the primary winding wire at the time of board mounting on the mounting board,
The primary winding has a structure in which it can be arbitrarily changed to one winding or two or more windings, and when it is desired to increase the current capacity of the primary winding, it must be connected in parallel to flow double the current. It is an object of the present invention to provide a versatile and economical bobbin with an embedded wire-embedded type terminal.

That is, the present invention provides a secondary side winding reel for winding a secondary side winding forming a board mounted type current detection transformer, and a primary side winding for both ends of the secondary side winding reel. In a bobbin provided with a first brim having a conductive wire and a second brim having a secondary terminal for connecting a secondary winding, the first bobbin having a primary winding 1
No. 1 of the U-shaped tsubo, which has one turn and protrudes from the underside of the tsuba.
A winding-embedded bobbin with a terminal, wherein two or more primary winding wires forming a secondary terminal are embedded to form a primary winding.

〔Example〕

 An embodiment of the present invention will be described with reference to FIGS. 1 to 5.

FIG. 1 shows that the U-shaped one-turn winding wire for the primary winding is embedded in the bobbin in two systems on the first collar 9, and the end of the U-shaped wire exposed on the bottom surface of the bobbin is connected to the primary terminal. FIG. 2 is a perspective view of the outer appearance of the bobbin as seen from the bottom side, showing an embodiment of the present invention having a primary winding.

In FIG. 1, the primary side terminals 6, 61 and the primary side of the primary side winding conductor wire 11 for forming two primary side windings composed of U-shaped conductors on the first collar 9 Each of the terminals 7 and 71 is a terminal integrated with a U-shaped conductor wire, and is integrally embedded in the first collar 9 of the bobbin 1 so that the core insertion portion 2 of the bobbin that incorporates the split core into the closed magnetic path is U-shaped. The primary side terminals 6 and 61 and the primary side terminals 7 and 71, which have a U-shaped straddle structure and protrude from the bottom surface of the brim at the tip of the U-shape, each form a winding of one turn. A secondary side winding (not shown) is wound around the secondary side winding frame 3, and the secondary side winding passes through a recess 8 for drawing out a lead wire of the secondary side winding,
The second collar 10 facing the first collar 9 with the secondary winding bobbin 3 in between.
The secondary side terminal 4 and the secondary side terminal 5 that are planted in the In the conventional bobbin, only one of the primary side terminal 6 and the primary side terminal 61 or the primary side terminal 7 and the primary side terminal 71 of FIG. 1 is embedded.

By using the bobbin of the present invention and changing the wiring combination of the primary side terminals 6 and 61 and the primary side terminals 7 and 71 of the two systems on the mounting board, many wiring combinations can be obtained as shown below. It is a usable primary winding. 2 to 6 show wiring examples of some types of current detecting transformers using the bobbin with the winding embedded type terminal according to the present invention shown in FIG. FIG. 2 is a basic circuit diagram when a current detecting transformer is constructed by winding a secondary winding around a bobbin according to the present invention.

Figure 3 shows an example of using the same method as the conventional one.
The I ₁ and the primary-side terminal 6 primary terminals 61, or the primary-side terminals 7 and shows an example of using only the primary side terminals 71.

FIG. 4 shows that when it is necessary to increase the current capacity of the primary-side current I ₁ compared to the example of FIG. 3, the primary-side terminal 6, the primary-side terminal 61, and the primary-side terminal 7 An example in which the polarities of the primary side terminals 71 are matched and used in parallel is shown.

FIG. 5 shows that the number of windings of the primary side winding is actually 2 by using the primary side terminal 61 and the primary side terminal 7 connected in series.
An example in which the output current I ₂ on the secondary side is doubled by winding is shown.

FIG. 6 shows 1 flowing in each of the two primary winding wires.
The secondary side currents I ₁₁ and I ₁₂ are transferred to the primary side terminal 6 and the primary side terminal 61,
Also, in this example, the primary side terminal 71 and the primary side terminal 7 are energized with their polarities reversed, and the difference current between the primary side currents I ₁₁ and I ₁₂ is detected.

In addition, the above is the first winding wire for the primary winding of two windings.
Although the example of embedding in the collar of the first collar has been described, the thickness range of the first collar that can secure a creeping distance that ensures sufficient withstand voltage characteristics between the primary winding and the secondary winding in the bobbin. Inside, a plurality of primary winding wires forming the primary winding are embedded and the terminals of the respective combined wires are connected on the substrate to form the primary winding. That is, in the bobbin according to the present invention, since the same number of primary side windings are used for the primary side windings of a large number of systems, the desired output current or output voltage after mounting on the board can be obtained by using a plurality of U-shaped ones. The number of windings of the primary winding and the current capacity can be arbitrarily combined by connecting the terminals of the secondary winding conductors to each other on the mounting board.

[Effect of device]

By using the bobbin of the present invention as a transformer for current detection, a plurality of U-shaped primary side winding conductors are connected on a mounting board and various wirings are combined on the board connecting the primary side terminals. It is possible to comply with the specifications on the mounting board according to the operating current of various electrical equipment, desired detection current or detection voltage output, and withstand voltage of primary winding and secondary winding. A current detection transformer with guaranteed characteristics can be configured.

That is, according to the present invention, it is economical to construct a current detecting transformer capable of selectively combining the current capacity of the primary winding and the output current value of the secondary winding with one bobbin on the mounting board. Bobbin can provide.

[Brief description of drawings]

FIG. 1 is a partially transparent perspective view from the bottom side of a bobbin with a winding embedded type terminal according to the present invention. FIG. 2 is a wiring diagram of a current detecting transformer using a bobbin with a winding embedded type terminal according to the present invention. FIGS. 3, 4, 5, and 6 show examples of wiring for combining primary windings forming a current detection transformer using a bobbin with a winding embedded terminal according to the present invention. Wiring diagram. In the figure, the-mark indicates the polarity and the arrow indicates the direction of the current. 1 ... Bobbin. 2 ... Magnetic core insertion part. 3 ... Secondary winding reel. 4, 5 ... Secondary side terminals. 6, 61, 7, 71 ... Primary side terminal. 8 ... recess. 9 ... First tsuba. 10 ... Second tsuba. 11 ... Conductor wire for the primary winding. _{I 1, I 11, I 12} ...... 1 primary current. I ₂ …… Secondary side output current.

Claims (1)

[Scope of utility model registration request] 1. A secondary winding winding frame for winding a secondary winding forming a board-mounted current detection transformer, and primary windings at both ends of the secondary winding winding frame. The first tsuba with the conductors planted,
In a bobbin provided with a second collar in which a secondary side terminal for connecting the secondary side winding is provided, a U-shaped one-turn winding is formed on the first collar in which the primary side winding is implanted. With a wire-embedded terminal, the primary winding is formed by embedding two or more primary winding wires that project on the lower surface of the first collar and form primary terminals. Bobbin.