JPH0817663A - Current transformer - Google Patents

Abstract

(57) [Abstract] [Purpose] In a one-turn type current transformer, when the measured current value is large and the measured current circuit pattern cannot be provided on the substrate, the primary winding of the current transformer and the measured current are measured. Provided is a current transformer that can be easily connected to a circuit. [Structure] An H-shaped conductor 1a formed by molding a rod-shaped conductor to be a primary winding is attached to a flange 4 of a bobbin, and
After the secondary winding process, the magnetic core 7 is assembled, the magnetic core 7 is fixed by the clamp 8 to complete the current transformer, and the current circuit to be measured is connected to the terminal portion 2a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current transformer used as an alternating current detection element in an overcurrent protection circuit of a switching power supply, a load current detection circuit of an air conditioner and the like.

[0002]

2. Description of the Related Art FIG. 7 is a perspective view showing a bobbin structure of a conventional one-turn type current transformer. Conventionally, the structure of a current transformer having a primary conductor is shown in FIG. 7 (a), in which a U-shaped conductor 1 formed by molding a rod-shaped conductor into a U-shape is shown in FIG.
As shown in (b), the U-shaped conductor 1 as the primary winding is directly adhered to the flange 4 of the bobbin body, which is a single member integrally molded of synthetic resin, leaving the terminal 2 at the tip. Or the groove corresponding to the thickness of the U-shaped conductor 1 is provided in the flange 4, and the U-shaped conductor 1 is mounted in the groove. Reference numeral 3 is a secondary winding pin terminal, and 5 is a winding barrel portion. FIG.
Shows a perspective view of the assembled current transformer, 6 is a secondary winding part, 7 is a magnetic core, and 8 is a clamp for fixing the magnetic core. In the current transformer having such a conventional structure, the circuit to be measured and the primary winding are connected by providing a circuit pattern on the substrate in advance according to the magnitude of the current to be measured, or As shown, an electric wire 10 provided with a crimping terminal 9 or the like at its end is used by penetrating the window of the magnetic core 7.

[0003]

Therefore, when the current transformer having the conventional structure as described above is mounted on the substrate for use, generally, the thickness of the conductor forming the circuit pattern on the substrate is thin, so that the allowable current value is increased. Is limited and cannot be used for measuring large currents. In this case,
As shown in FIG. 9, the electric wire 10 that serves as the primary winding is used by penetrating through the window of the magnetic core 7, but the complexity of the penetrating work of the electric wire 10 and the window for the electric wire to be penetrated through the magnetic core 7 in advance Therefore, there is a problem that the size of the current transformer becomes large.

The problem to be solved is that the current to be measured can be easily connected to the primary winding of the current transformer when the current to be measured is large and the current to be measured cannot be provided on the substrate. To provide a transformer.

[0005]

In order to solve the above-mentioned problems, according to the present invention, the primary winding is conventionally formed by forming a rod-shaped conductor into a U-shaped conductor and arranging it on the flange portion of the bobbin. On the other hand, by making the shape of the primary winding H-shaped or I-shaped and arranging it on the flange portion of the bobbin, and using the flange portion of the bobbin at the end of the primary winding, The connection terminal was projected from the upper portion or the side portion, and the board fixing pin terminal was projected from the lower portion of the flange portion to facilitate the connection with the current circuit to be measured. Also, by mounting the current transformer on the board connecting base plate having terminals for connecting to the current circuit to be measured and the insertion holes for the terminals of the current transformer in advance, the primary winding and the measured wire can be mounted on the board. Easy connection of current circuit. That is, the present invention provides a current transformer having at least two windings, at least one of which has one turn, wherein the one-turn winding is formed by forming a rod-shaped conductor into an H-shape. A current transformer characterized by being arranged on the flange portion of a bobbin of synthetic resin,
A current transformer comprising at least two windings, at least one of which comprises one turn, the one-turn winding penetrating an I-shaped rod-shaped conductor through a window of a magnetic core of the current transformer. In the current transformer, the current transformer is arranged on the flange portion of the bobbin made of synthetic resin so as to have at least two windings, and at least one of the windings has one turn. The one-turn winding is a current transformer characterized in that an I-shaped rod-shaped conductor is arranged in a collar of a bobbin made of synthetic resin so as to penetrate the window of the magnetic core of the current transformer. In a current transformer having a plurality of windings, at least one of which has one turn, the one-turn winding is formed by forming a rod-shaped conductor into a U-shape and forming a synthetic resin bobbin. For connecting a circuit board having a fixed terminal for connecting the current transformer to a current circuit to be measured and a through hole for the terminal of the current transformer connected to the terminal. A current transformer characterized by being attached to a base plate.

[0006]

Function When measuring a large current in which the circuit pattern on the board on which the current transformer is mounted cannot be used, the end of the primary conductor is exposed at the top or side of the current transformer. Connection becomes easy. Further, since the current transformer is attached to the substrate mounting base plate having the terminals connected in advance to the primary winding and then attached to the substrate, the connection with the current circuit to be measured becomes easy.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings.

(Embodiment 1) FIG. 1 is a perspective view showing the structure of a bobbin of Embodiment 1 of the current transformer of the present invention.
FIG. 1A is a perspective view of an H-shaped conductor 1a formed by forming a rod-shaped conductor to be a primary winding, and FIG. 1B is a perspective view of a bobbin in which the H-shaped conductor 1a is attached to a flange 4 part. Is. The terminal portion 2a is for connecting the H-shaped conductor 1a and the current circuit to be measured, and the terminal portion 2b at the lower end of the H-shaped conductor 1a is for reinforcement for fixing the current transformer to the substrate. The terminal portion 3 is a secondary winding terminal. FIG. 2 is a perspective view showing the configuration of the current transformer of the present invention, in which the terminal portion 2a and the electric wire 10 connected to the current circuit to be measured are connected by the crimp terminal 9a at the tip. In the current transformer of the present invention, when the measured current value is small and the measured current circuit can be formed by the pattern on the circuit board, the terminal portion 2b can be used as the terminal of the primary winding, and if necessary, Both can be used. Further, although the H-shaped conductor is used in this embodiment, the same effect can be obtained with the π type.

(Embodiment 2) FIG. 3 is a perspective view showing the structure of a bobbin of Embodiment 2 of the current transformer of the present invention.
FIG. 3A is a perspective view of an I-shaped rod-shaped conductor 1b serving as a primary winding, and FIG. 3B is a perspective view of a bobbin in which the I-shaped conductor 1b is attached to a flange 4 part. The terminal portion 2c is for reinforcement for fixing the current transformer to the substrate. Terminal part 3
Is a terminal for secondary winding. FIG. 4 is a perspective view showing the configuration of the current transformer of the present invention. After the current transformer is fixed to the substrate, the core portion of the tip of the electric wire 10 connected to the current circuit to be measured is provided at both ends of the I-shaped conductor 1b. 9b is pulled off and connected with solder. In this embodiment, the I-shaped conductor is used, but the same effect can be obtained with a V-shaped conductor.

(Embodiment 3) FIG. 5 is a perspective view showing an assembling method of Embodiment 3 of the current transformer of the present invention. Figure 5
The current transformer is of the conventional type having a U-shaped conductor 1. The current transformer is attached to the board connecting base plate 11 to complete the process. On the resin base plate 11,
An insertion hole 12 into which the terminal portion 3 of the secondary winding terminal is inserted;
There is an insertion hole 12a into which the terminal portion 2 of the U-shaped conductor 1 is inserted, and a terminal 13 connected to the measured current circuit.
3 is connected to the insertion hole 12a and the back surface of the base plate 11. FIG. 6 is a perspective view showing a state in which the current transformer is attached to the base plate 11. The terminal part 2 and the terminal part 3 are attached to the circuit board after being soldered on the back surface of the base plate 11,
An electric wire connected to the measured current circuit is connected to the terminal 13.

[0011]

The current circuit to be measured and the primary winding of the current transformer can be easily connected, and the work efficiency of mounting the current transformer is improved. Also, it becomes possible to measure a large current.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a bobbin of a current transformer according to a first embodiment of the present invention. FIG. 1A is a perspective view of an H-shaped conductor that serves as a primary winding. FIG. 1B is a perspective view showing the structure of a bobbin equipped with the H-shaped conductor.

FIG. 2 is a perspective view showing the configuration of a current transformer according to the first embodiment of the present invention.

FIG. 3 is a perspective view showing a configuration of a bobbin of a current transformer according to a second embodiment of the present invention. FIG. 3A is a perspective view of an I-shaped conductor that serves as a primary winding. FIG. 3B is a perspective view showing the structure of the bobbin to which the I-shaped conductor is attached.

FIG. 4 is a perspective view showing the configuration of a current transformer according to a second embodiment of the present invention.

FIG. 5 is a perspective view showing a method of assembling the current transformer according to the third embodiment of the present invention.

FIG. 6 is a perspective view showing the configuration of a current transformer according to a third embodiment of the present invention.

FIG. 7 is a perspective view showing a configuration of a bobbin of a conventional one-turn type current transformer. FIG. 7A is a perspective view of a U-shaped conductor that serves as a primary winding. FIG.7 (b) is a perspective view which shows the structure of the bobbin to which the said U-shaped conductor was attached.

FIG. 8 is a perspective view showing a configuration of a conventional current transformer.

FIG. 9 is a perspective view in which an electric wire through which a current to be measured flows is passed through a conventional current transformer.

[Drawing reference number]

 1 U-shaped conductor 1a H-shaped conductor 1b I-shaped conductor 2 Terminal portion 2a, 2b (of U-shaped conductor) Terminal portion 2c (Reinforcement) Terminal portion 3 (For secondary winding) Terminal portion 4 Flange 5 Winding frame 6 Secondary winding part 7 Magnetic core 8 Clamp 9 Crimp terminal 9a (Wire's) core wire part 10 Electric wire 11 Base plate 12, 12a Insertion hole 13 Terminal

Claims (3)

[Claims] 1. A current transformer comprising at least two windings, at least one of which has one turn, wherein the one-turn winding is formed by forming a rod-shaped conductor into an H-shape and combining the two. A current transformer characterized by being arranged on the flange portion of a resin bobbin. 2. A current transformer comprising at least two windings, at least one of which comprises one turn, said one-turn winding comprising an I-shaped rod-shaped conductor. A current transformer characterized in that it is arranged on a flange portion of a synthetic resin bobbin so as to penetrate the window of the core. 3. A current transformer comprising at least two windings, at least one of which has one turn, wherein the one-turn winding is formed by forming a rod-shaped conductor into a U shape. A current transformer arranged on a flange portion of a resin bobbin, having two fixed terminals for connecting the current transformer to a current circuit to be measured, and terminal insertion holes for the current transformer connected to the terminals. A current transformer characterized by being attached to a board connection base plate.