JPH1041172A - Current transformer - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a current transformer capable of improving the degree of coupling between a primary coil and a secondary coil and obtaining a high output voltage even with a small current. SOLUTION: A plurality of primary coil U-shaped pins 2a, 2 are provided.
b is implanted in the flanges 5b and 5c of the coil bobbin 4a.
A current transformer having a sandwich structure sandwiched by secondary coils 3a, 3b, 3c wound separately on a winding frame partitioned by a, 5b, 5c, 5d.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current transformer for detecting a circuit current used in electronic equipment and the like.

[0002]

2. Description of the Related Art FIG. 4 is an external perspective view of a conventional current transformer, and FIG. 5 is a front view thereof. As shown in FIGS. 4 and 5, in the conventional current transformer, the U-shaped pin 2 for the primary side coil is inserted from above into the concave groove 1 provided on one flange 5 of the coil bobbin 4 in a reverse direction. The secondary coil 3 is wound around the center, and the magnetic core 6 is assembled. As described above, the U-shaped pin 2 for the primary coil is installed in one turn and adjacent to the outside of the secondary winding bobbin.

[0003]

In such a current transformer, when the primary current is small, the magnetomotive force (N
Since I) is very small, the output voltage is also small, and there is a disadvantage that the sensitivity is lowered or the detection becomes impossible. Also, 1
The U-shaped pin 2 for the secondary side coil and the secondary side coil 3 have a disadvantage that the degree of coupling between the windings is reduced due to the separate winding structure.

[0004] Therefore, a technical object of the present invention is to eliminate such a drawback, to improve the degree of coupling between the primary coil and the secondary coil of the current transformer, and to reduce the output voltage even with a small current. An object of the present invention is to provide a high current transformer.

[0005]

In the current transformer according to the present invention, the U-shaped pin for the primary side coil has two or more plural pins, and the U-shaped pins for the primary side coil are respectively spaced inside the secondary winding bobbin. It is installed. The secondary coil has a structure in which the coil is divided and wound into a winding frame partitioned by a resin of a U-shaped pin for the primary coil.

That is, the present invention is a current transformer in which a magnetic core is attached to a coil bobbin in which a primary coil and a secondary coil are wound by a U-shaped pin for a primary coil, and two or more coils are provided. A current transformer characterized in that U-shaped pins for the secondary coil are implanted in inner flanges of a plurality of flanges provided on the coil bobbin at regular or irregular intervals.

In the present invention, by increasing the number of turns N on the primary side, the magnetomotive force NI is increased, and the output voltage on the secondary side is increased.
Sensitivity can be improved. In addition, the sandwich winding structure in which the primary and secondary windings are alternately wound can improve the degree of coupling between the windings.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an external perspective view of a current transformer of the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a diagram showing a board wiring pattern when the current transformer of the present invention is mounted. .

As shown in FIGS. 1 and 2, the current transformer of the present invention comprises U-shaped pins 2a and 2b for a primary coil.
Is a flange 5 provided in the middle of the resin coil bobbin 4a.
b, 5c are installed at an interval in the groove 1 respectively, and
The U-shaped pins 2a, 2b for the primary coil are sandwiched between the secondary coils 3a, 3b, 3c divided and wound around a winding frame partitioned by the flanges 5b, 5c and the outer flanges 5a, 5d to form a sandwich winding structure. Has become.

As shown in FIG. 3, the two U-shaped pins for the primary coil are formed by arranging the conductive plates 7 diagonally and connecting them in series to form a primary coil.

[0012] Here, the case where the number of U-shaped pins for the primary coil is two has been described, but the same structure can be applied to the case of three or more U-shaped pins.

[0013]

As described above, according to the present invention,
It is possible to improve the degree of coupling between the windings of the primary side coil and the secondary side coil, and obtain a current transformer capable of obtaining a high output voltage even with a small current.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a current transformer according to the present invention.

FIG. 2 is a front view when the current transformer according to the present invention is mounted on a board.

FIG. 3 is a diagram showing a substrate wiring pattern when a current transformer is mounted according to the present invention.

FIG. 4 is an external perspective view of a conventional current transformer.

FIG. 5 is a front view when a conventional current transformer is mounted on a board.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concave groove 2, 2a, 2b U-shaped pin for primary coil 3, 3a, 3b, 3c Secondary coil 4, 4a Coil bobbin 5, 5a, 5b, 5c, 5d Flange 6 Magnetic core 7 Conducting plate 8 (U Through hole 9 (for secondary coil terminal) through hole 10 board

Claims (1)

[Claims] 1. A current transformer in which a magnetic core is assembled to a coil bobbin in which a primary coil and a secondary coil are wound by a U-shaped pin for a primary coil, and is used for two or more primary coils. A current transformer, wherein a U-shaped pin is implanted in each of inner flanges of a plurality of flanges provided on the coil bobbin at fixed or irregular intervals.