JPH04103611U - fixed chip inductor - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent heat generation by reducing the resistance after a layer short occurs in a chip-fixed inductor as a safety measure in case of abnormal overcurrent in the power supply circuits of various electronic devices. [Structure] A pair of metal plate terminals 13 are fixed to the outer surface of one side of the rib of a drum-shaped magnetic core 11 having flanges at both ends, and protrusions 15 cut and raised on the metal plate terminal 13 are attached along the circumferential surface of the rib. By electrically connecting the coil to this protruding piece 15, the coil element can be formed in the shortest possible time without the winding start and winding end wires 16, 17 riding on the brim of the drum shape 11. When an overcurrent is passed through the coil, a layer short circuit occurs over the entire area of the coil, and the resistance is only the length of the copper wire from the coil lead-out part to the protrusion 15, which is greatly reduced, making it possible to prevent ignition and reduce the amount of smoke generated. .

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to fixed chip inductors used in various electronic devices and communication devices. It is something that

0002

[Conventional technology]

In recent years, with the rapid progress of semiconductor technology, various electronic devices and communication devices are becoming increasingly digital. As technology and frequency have progressed, functionality and performance have improved, and chip components have High-density surface mounting methods have become widespread and are greatly contributing to the miniaturization and thinning of devices. But the equipment With the miniaturization of devices, safety requirements for equipment are high, and among these, video cameras are becoming more and more A chip used in equipment that requires power line noise signal processing as shown below. Fixed inductors are required to have safety measures against overcurrent.

0003 A conventional chip fixed inductor will be explained below. FIG. 3 shows a transparent perspective view of a conventional chip-fixed inductor. In Figure 3 1 is a drum-shaped magnetic core, 2 is a coil wound around the drum-shaped magnetic core 1, and 3 is a metal plate. 4 is a wire for wiring the winding start wire 6 and winding end wire 7 of the coil 2 and the metal plate terminal 3. The connecting piece 8 to be connected is an exterior molded body.

0004 Regarding the chip fixed inductor configured as above, one of its manufacturing methods will be explained below. Let's discuss an example. First, in advance, connect the drum-shaped magnetic core 1 onto the surfaces of the pair of metal terminals 3. It is fixed with adhesive, etc., and the winding start wire 6 of the coil 2 is first connected to one side using an automatic winding and wiring machine. After winding and fixing the metal plate terminal 3 around the connection piece 4, the coil 2 is wound, and the end wire 7 is Wrap it around the connection part 4 of one metal terminal 3 and fix it, then solder it to the connection piece 4 of both sides. They are connected by screws or the like, and the entire body is covered with an exterior molded body 8.

[0005]

[Problem that the idea aims to solve]

In general, inductors have stray capacitance between the winding wires and resistance in the windings. Are known. The equivalent circuit when looking at the inductor from the terminal is shown in Figure 4. The stray capacitance C is the sum of the inter-winding capacitance and the line-to-line capacitance at the beginning and end of the winding, In the figure, R is the sum of the resistance of the copper wire of the coil and the loss of the drum-shaped magnetic core. This equivalent As is clear from the circuit, in order to make the inductor have good characteristics in the power line. Therefore, it is necessary to reduce the resistance. Also, as a safety measure test, overcurrent is measured by fixing the chip. When the conductor is flowing, the heat generated by the resistance destroys the copper wire coating and causes a layer short. and reduce the resistance.

[0006] However, in the conventional structure, the winding starts on one side of the drum-shaped magnetic core 1, and the wiring ends at the end of the winding. However, if both wires ride on the brim of the drum-shaped magnetic core 1 during wiring, or if the drum-shaped The winding part of magnetic core 1 may not come into contact with other winding parts, and the resistance may decrease due to overcurrent. This eliminates the problem of safety hazards such as smoke and fire due to the heat generated by the resistance. had.

[0007] This invention solves the above conventional problems and reduces the resistance against overcurrent. The purpose is to provide a chip fixed inductor that is effective for use in power supply lines. Ru.

[0008]

[Means to solve the problem]

To achieve this purpose, the chip-fixed inductor of the present invention has flanges at both ends. A pair of metal plate terminals are fixed along the outer surface of one side rib of the drum-shaped magnetic core, and the A cut protrusion is provided on the metal plate terminal along the circumferential surface of the terminal, and the coil is connected to this protrusion. It is constructed by physically connecting the two.

[0009]

[Effect]

This configuration makes it possible to minimize the length of the winding start wire and end winding wire of the coil. When an overcurrent is passed through, the copper wire will cause a layer short due to the heat generated by the resistance, and the resistance will increase. This makes it possible to reduce the amount of smoke emitted from a safety perspective and prevent ignition.

0010

【Example】

An embodiment of the present invention will be described below with reference to the drawings. Figure 1 is the main idea. FIG. 3 is a transparent perspective view showing the internal structure of a chip-fixed inductor in a proposed embodiment. Moreover, FIG. 2 is a plan view showing the internal structure of the chip fixed inductor in the embodiment of the present invention. It is a diagram. In FIG. 1, 11 is a drum-shaped magnetic core, and 12 is this drum-shaped magnetic core 11. A wound coil, 13 a pair of terminals made of a metal plate, and 14 a coil 12 connected to terminal 1. It is a connecting piece provided on the terminal 13 to fix it to the coil 12, and is pulled out from the coil 12. The length of the winding start wire 16 and the winding end wire 17 of the coil 12 is electrically the shortest. A projecting piece 15 is provided along the outer peripheral surface of the brim of the round-shaped magnetic core 11 and connected by soldering or the like. The winding start line 16 of the coil 12 and the winding end line of the coil 12 are connected to the connecting piece 14 from the protruding piece 15. 17 and secure it.

[0011] 18 is an exterior molded body made of heat-resistant resin such as epoxy resin, and the inside of the coil It protects the structure and forms the overall shape of the coil.

0012 Next, an example of a method for manufacturing the chip-fixed inductor shown in this example will be explained. . First, the drum-shaped magnetic core 11 is made of a metal plate having a protruding piece 15 and a connecting piece 14. It is fixed to a pair of terminals 13 with adhesive or the like. Next, connect the winding start wire 16 to the connection piece on one side. 14 and temporarily fixed, it is pulled into the protruding piece 15 and placed in the winding groove of the drum-shaped magnetic core 11. The coil 12 is formed by winding the wire a certain number of times, and then the winding end wire 17 is connected to the other terminal 1. 3, wrap it around the connecting piece 14 and temporarily fix it, and then connect the terminal 13 with the protruding piece 15. After joining the coil 12 and the coil 12 by soldering, the entire coil is sealed with an exterior molded body 18. Form the stopper. However, the connecting piece 14 that has been wrapped and temporarily fixed may be removed after soldering. Although this is not the case, sealing molding may be performed with the exterior molded body 18 while temporarily fixing.

[0013] The chip fixed inductor manufactured and configured as described above is manufactured by winding the drum-shaped magnetic core 11. The winding start line 16 and the winding end line 17 should not rest on the brim of the drum-shaped magnetic core 11 with respect to the groove. The coil 12 can be formed in the shortest possible time, and the part where the winding part contacts other winding parts. will increase.

[0014]

[Effect of the idea]

As described above, this invention reduces the resistance value of the chip fixed inductor against overcurrent. Drum shape with flanges at both ends to prevent smoke and ignition due to self-heating. A pair of metal plate terminals are fixed along the outer surface of one side of the rib of the magnetic core, and are attached along the circumferential surface of the rib. A cut-and-raised protrusion is provided on the metal plate terminal, and a coil is electrically connected to this protrusion. By doing so, the winding start wire and winding end wire can be coiled in the shortest possible time without riding on the brim of the drum-shaped magnetic core. When a coil is formed and there are many contact points between the windings and other windings, causing an overcurrent to flow, a chip will occur. Self-heating occurs due to the resistance of the fixed inductor, and the heat generation temperature deteriorates the copper wire coating, causing the layer to deteriorate. A short occurs. This layer short portion occurs over the entire area, and the resistance is small. The tip fixing device suppresses self-heating and prevents smoke and ignition. The inductor can be easily realized and its industrial effects are great.

[Brief explanation of drawings]

FIG. 1 is a transparent perspective view showing the internal structure of a chip-fixed inductor in an embodiment of the present invention.

[Fig. 2] A plan view showing the internal configuration of a chip-fixed inductor in an embodiment of the present invention.

[Figure 3] Transparent perspective view of a conventional chip fixed inductor

[Figure 4] Shows the equivalent circuit of a fixed inductor

[Explanation of symbols]

11 Drum-shaped magnetic core 12 coil 13 Terminal 14 Connection piece 15 Projection piece 16 Winding start line 17 Volume end line 18 Exterior molded body

Claims (2)

[Scope of utility model registration request] Claim 1: A pair of metal plate terminals are fixed to the outer surface of one side rib of a drum-shaped magnetic core having flanges at both ends, and a protrusion cut and raised on the metal plate terminal is provided along the circumferential surface of the rib. , a chip fixed inductor in which a coil wound around a drum-shaped magnetic core is electrically connected to this protrusion. 2. A pair of metal plate terminals is provided with a connecting piece for temporary fixing at the start and end of coil winding, and a protruding piece cut and raised along the circumferential surface of the drum-shaped magnetic core, and the protruding piece Start winding the coil,
The chip fixed inductor according to claim 1, wherein the ends thereof are electrically connected.