JP7075665B2 - Fuse resistor assembly and manufacturing method of fuse resistor assembly - Google Patents

Description

The present invention relates to a fuse resistor assembly, and more particularly to a fuse resistor assembly including a fuse existing between the resistors and a method for manufacturing the same.

Generally, a microfuse is provided at the power input end of an electronic product such as a television or a video so as to prevent the circuit from burning or causing a fire on the board by disconnecting the circuit when an overcurrent flows in. This microfuse acts as a circuit breaker due to its fusing characteristics in the event of an abnormality such as overload.

Such fuses are made of a material that forms a fusible element layer, and use copper, which has a very low temperature coefficient and melting point, although it has a very low intrinsic ratio resistance value compared to other metals. As a result, even if the rated current is increased to 10 A or more, it can be flowed stably, and it is stably blown within a predetermined time by an overcurrent of high current or more. It is used in place of existing fuses in home appliances such as TVs and monitors.

However, the conventional fuse resistance assembly has a problem that the blown characteristics of the fuse due to the heat generated by the resistor are not constant, and the blown characteristics of the fuse do not react sensitively to overcurrent.

An object to be solved by the present invention is to provide a fuse resistance assembly and a method for manufacturing the same, in which a fuse is joined in series between resistors to improve the blowing characteristics of the fuse.

A fuse resistor assembly according to the present invention for solving the above problems is a first resistor and a second resistor that distribute an applied current or voltage; and between the first resistor and the second resistor. Includes a fuse; one side of which is coupled to the first resistor and the other side of which is coupled to the second resistor and connected in series with the first resistor and the second resistor. The fuse comprises a stick-shaped fuse rod; and a soluble material coating layer applied to the surface of the fuse rod and blown by an overcurrent generated from the first resistor and / or the second resistor. It is characterized by.

The first resistor is a first resistance rod; a first outer resistance cap coupled to one side of the first resistance rod; a first inner resistance cap coupled to the other side of the first resistance rod; and said. The second resistance body includes a first resistance wire that connects the first outer resistance cap and the first inner resistance cap while surrounding the first resistance rod; the second resistance rod is the second resistance rod; the second resistance rod. The second outer resistance cap coupled to one side; the second inner resistance cap coupled to the other side of the second resistance rod; and the second outer resistance cap and the second while surrounding the second resistance rod. 2 It is characterized by including a second resistance wire connecting the inner resistance cap.

The first inner resistance cap has a first resistance insertion groove in which a groove for insertion with the other side of the first resistance rod is formed on one side; and insertion with one side of the fuse on the other side. It is characterized by including a first fuse insertion groove; in which a groove is formed for.

The second inner resistance cap has a second resistance insertion groove in which a groove for insertion with the other side of the second resistance rod is formed on one side; and insertion with the other side of the fuse on the other side. It is characterized by including a second fuse insertion groove; in which a groove is formed.

The soluble material coating layer is characterized in that the surface of the fuse rod is coated with a tin component.

The soluble material coating layer is characterized in that a trimming pattern is formed for adjusting the fusing time due to the overcurrent.

The trimming pattern is characterized in that at least one of the number of cutting points and the cutting shape is different from each other.

The fuse resistor assembly is characterized by further including a first resistor, a second resistor and an assembly protective cover surrounding the fuse.

The method for manufacturing a fuse resistor assembly according to the present invention for solving the other problems is a step of forming a first resistor and a second resistor that distribute an applied current or voltage; the first resistor. And / or a step of connecting a fuse blown by an overcurrent generated from the second resistor in series between the first resistor and the second resistor; and the first resistor, the first resistor. 2. One side of the fuse is inserted into the first inner resistance cap constituting the first resistor, and the other side of the fuse is inserted, including the step of surrounding the resistor and the fuse with an assembly protective cover. It is characterized in that it is inserted into a second inner resistance cap constituting the second resistor.

At the stage of connecting the fuse in series between the first resistor and the second resistor, the first resistor is inserted with a groove formed on one side for insertion with the other side of the first resistor rod. It is characterized in that the first resistor including the groove and the first fuse insertion groove in which a groove for inserting one side of the fuse is formed on the other side is connected in series with the fuse.

At the stage of connecting the fuse in series between the first resistor and the second resistor, a second resistor is inserted in which a groove for insertion with the other side of the second resistor rod is formed on one side. It is characterized in that the second resistor including the groove and the second fuse insertion groove in which a groove for inserting the other side of the fuse is formed on the other side is connected in series with the fuse.

The fuse is characterized in that a fusible material coating layer that is blown by an overcurrent is formed on a stick-shaped fuse rod.

The soluble material coating layer is characterized in that a trimming pattern is formed for adjusting the fusing time due to the overcurrent.

The trimming pattern is characterized in that at least one of the number of cutting points and the cutting shape is different from each other.

According to the present invention, the resistor and the fuse are joined, but by connecting the fuse between the two resistors, the radiant heat generated from the resistor is effectively transmitted to the fuse to the resistor. The overcurrent that flows makes the blown characteristics of the fuse sensitively responsive. Thereby, the circuit element of the load due to the overcurrent can be appropriately protected.

In particular, according to the present invention, by connecting a fuse containing a fuse rod coated with a fusible body in series between the resistors, the durability of the fuse resistor assembly is increased, thereby being resistant to external impact. However, damage to the fuse resistor assembly can be minimized, and the fuse blowing characteristics due to overcurrent can be precisely realized by the trimming pattern.

It is a perspective view of the fuse resistance assembly of one Embodiment by this invention. It is sectional drawing in the cut plane (AA'cut plane) in the longitudinal direction of the fuse resistance assembly shown in FIG. 1A. It is a reference figure which shows the detailed component of the 1st resistor or the 2nd resistor. It is a reference figure which illustrates the fuse coupled between the 1st resistor and the 2nd resistor. It is a reference figure which illustrates the trimming pattern formed on the soluble body coating layer 304 of the fuse 300 by this invention. It is a reference figure of one Embodiment which compares the fusing time by the number of cutting points. It is a reference figure of one Embodiment which compares the fusing time by a point shape among the cutting shapes. It is a reference figure of still another Example which compares the cutting time by the line shape among the cutting shapes. It is a flowchart explaining one Embodiment of the manufacturing method of the fuse resistance assembly by this invention. It is a reference table exemplifying the characteristic test of the fuse resistance assembly by this invention. It is a reference table exemplifying the characteristic test of the fuse resistance assembly by this invention. It is a reference table exemplifying the characteristic test of the fuse resistance assembly by this invention. It is a reference table exemplifying the characteristic test of the fuse resistance assembly by this invention. It is a reference table exemplifying the characteristic test of the fuse resistance assembly by this invention. It is a reference table exemplifying the characteristic test of the fuse resistance assembly by this invention. It is a reference table exemplifying the characteristic test of the fuse resistance assembly by this invention. It is a reference table exemplifying the characteristic test of the fuse resistance assembly by this invention. It is a table comparing the comprehensive results related to the characteristic test shown in FIGS. 9A to 9H.

As the description of the present invention is merely an embodiment for structural or functional explanation, the scope of rights of the present invention should not be construed as being limited by the embodiments described in the text. That is, since the embodiments can be modified in various ways and have various forms, it must be understood that the scope of rights of the present invention includes equivalents capable of realizing the technical idea.

The statement that one component is "connected" to another component can be directly linked to the other component, or it can have other components in between. You have to understand that. On the other hand, the statement that one component is "directly linked" to another must be understood as having no other component in between.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the art, unless otherwise defined. Terms defined in commonly used dictionaries must be construed to be consistent with the contextual meaning of the relevant technology and are ideal or overly formal unless expressly defined in the present invention. It is not interpreted as meaningful.

FIG. 1A is a perspective view of the fuse resistor assembly 10 of the embodiment according to the present invention, and FIG. 1B is a longitudinal cut surface (AA'cut surface) of the fuse resistor assembly shown in FIG. 1A. It is a cross-sectional view in.

Referring to FIGS. 1A-1B, the fuse resistor assembly 10 includes a first resistor 100, a second resistor 200, a fuse 300 and an assembly protection cover 400.

The first resistor 100 contains a conductive resistance component and has a function of limiting the inrush current. Further, the second resistor 200 also contains a conductive resistance component and has a function of limiting the inrush current.

FIG. 2 is a reference diagram showing detailed components of the first resistor 100 or the second resistor 200.

Referring to FIG. 2, the first resistance body 100 includes a first resistance rod 102, a first outer resistance cap 104, a first inner resistance cap 106, and a first resistance wire 108.

The first resistance rod 102 is made of a ceramic material and may include a shape having a cylinder, a prism, or the like.

The first outer resistance cap 104 is coupled to one side of the first resistance rod 102. The first outer resistance cap 104 may be inserted into one tip of the first resistance rod 102. The first outer resistance cap 104 is a cap including a unidirectional insertion groove (G0) (for example, a circular groove or a square groove) formed on only one side so that one tip of the first resistance rod 102 is inserted. obtain. The first outer resistance cap 104 can be made of a conductive material.

On the other hand, the first resistance lead wire 104-2 may be coupled to the other side of the first outer resistance cap 104 (that is, the outside of the cap). The first resistance lead wire 104-2 is a wire having electrical conductivity. The first resistance lead wire 104-2 is joined to the first outer resistance cap 104 by a method such as spot welding, laser welding, or soldering.

The first inner resistance cap 106 may be inserted into the other tip of the first resistance rod 102. For this purpose, the first inner resistance cap 106 may have a bidirectional groove (eg, circular or square groove) structure and may include a first resistance insertion groove (G1) and a first fuse insertion groove (G2). .. The first resistance insertion groove (G1) has a groove structure formed for insertion with the other side of the first resistance rod 102, and the first fuse insertion groove (G2) has a groove structure with one side of the fuse 300. It is a groove structure formed for insertion. Such a first inner resistance cap 106 can be made of a conductive material.

The first resistance wire 108 is a conductive wire that connects the first outer resistance cap 104 and the first inner resistance cap 106 while surrounding the first resistance rod 102. The first resistance wire 108 connects the first outer resistance cap 104 and the first inner resistance cap 106 while spirally surrounding the surface of the first resistance rod 102. Such a first resistance wire 108 contains a resistance component that is generated by overcurrent. One end 108-1 of the first resistance wire 108 is joined to one side of the first outer resistance cap 104, and the other end 108-2 of the first resistance wire 108 is joined to one side of the first inner resistance cap 106. It is joined.

Further, referring to FIG. 2, the second resistance body 200 includes a second resistance rod 202, a second outer resistance cap 204, a second inner resistance cap 206, and a second resistance wire 208.

The second resistance rod 202 can be made of a ceramic material including a shape such as a cylinder or a prism.

The second outer resistance cap 204 includes a cap structure coupled to one side of the second resistance rod.

The second inner resistance cap 206 includes a cap structure coupled to the other side of the second resistance rod. For this purpose, the second inner resistance cap 206 has a second resistance insertion groove (G1') in which a groove for insertion with the other side of the second resistance rod 202 is formed on one side and a fuse on the other side. It may include a second fuse insertion groove (G2') in which a groove for insertion with the other side of 300 is formed.

The second resistance wire 208 connects the second outer resistance cap 204 and the second inner resistance cap 206 while surrounding the second resistance rod 202. The second resistance wire 208 may have the same resistance value as the resistance of the first resistance wire 108 described above, or may have a resistance value different from that of the first resistance wire 108.

The above-mentioned second resistance rod 202 has the same or similar structure as the first resistance rod 102 of the first resistor 100, and the second outer resistance cap 204 is the first outer resistance cap 104 of the first resistor 100. The second inner resistance cap 206 has the same or similar structure as the first inner resistance cap 106 of the first resistor 100, and the second resistance wire 208 has the same or similar structure as the first resistance 100. The structure is the same as or similar to that of the first resistor 108, and detailed description of each component of the second resistor 200 will be omitted.

The fuse 300 is located between the first resistor 100 and the second resistor 200, and functions as a fusible body that electrically connects the first resistor 100 and the second resistor 200 and is cut by an overcurrent. Take on. That is, one side of the fuse 300 is coupled to the first resistor 100, the other side is coupled to the second resistor 200, and the fuse 300 is connected in series with the first resistor 100 and the second resistor 200, and is heated or excessive. It has the function of cutting off the circuit connection by current.

FIG. 3 is a reference diagram illustrating a fuse 300 coupled between the first inner resistance cap 106 of the first resistor 100 and the second inner resistance cap 206 of the second resistor 200. Referring to FIG. 3, one side of the fuse 300 is inserted into the first inner resistance cap 106 of the first resistor 100, and the other side of the fuse 300 is the second inner resistance cap 206 of the second resistor 200. It is inserted in.

The fuse 300 includes a stick-shaped fuse rod 302 and a soluble material coating layer 304 applied to the surface of the fuse rod 302 and blown by an overcurrent generated from the first resistor 100 and / or the second resistor 200. sell.

The fuse rod 302 includes a shape having a cylinder, a prism, or the like, and can be made of a ceramic material.

When an overvoltage or an overcurrent is applied and the first resistor 100 or the second resistor 200 generates heat, the soluble material coating layer 304 is blown by the heat and serves to cut off the electrical connection. The soluble material coating layer 304 is obtained by coating the surface of the fuse rod 302 with a tin component. Further, the soluble material coating layer 304 is a low melting point metal or alloy having a melting point of 450 ° C. or lower, for example, at least one element of Sn, Ag, Sb, In, Bi, Al, Zn, Cu and Ni. It can be exemplified that it is a soluble substance containing, but is not necessarily limited to this.

The soluble material coating layer 304 is formed with a trimming pattern for adjusting the fusing time due to overcurrent. The trimming pattern can be formed by laser cutting or diamond cutting. Here, the trimming pattern is cut with a different number of cutting points and at least one of the cutting shapes. At this time, the cutting shape is a point shape, a linear shape, or a spiral shape, and may be a combination of these.

FIG. 4 is a reference diagram illustrating a trimming pattern formed on the soluble material coating layer 304 of the fuse 300 according to the present invention. FIG. 4A exemplifies a point-shaped trimming pattern, and FIG. 4B exemplifies a line-shaped trimming pattern.

The trimming pattern may cause a difference in the fusing time of the soluble material coating layer 304 due to an overcurrent depending on the number of cutting points or the difference in the cutting shape. The difference in the fusing time of the soluble material coating layer 304 due to the trimming pattern will be described with reference to FIGS. 5 to 7 below.

FIG. 5 is a reference diagram of an embodiment in which the fusing time by the number of cutting points is compared, and FIG. 6 is a reference diagram of an embodiment in which the fusing time by the point shape is compared among the cutting shapes. Is a reference diagram of still another embodiment in which the fusing time due to the line shape is compared among the cutting shapes.

With reference to FIG. 5, it can be confirmed that the fusing time gradually decreases as the number of cutting points of the trimming pattern increases. Further, with reference to FIG. 6, it can be confirmed that among the cutting shapes of the trimming pattern, the fusing time decreases as the cutting points increase in the longitudinal direction. Further, with reference to FIG. 7, it can be confirmed that the fusing time decreases as the linear or spiral line length of the cutting shape of the trimming pattern increases. Therefore, by selecting the trimming pattern of the soluble material coating layer 304 according to the design purpose, the fusing time of the fuse resistance assembly 10 with respect to the overcurrent can be adjusted.

The assembly protective cover 400 surrounds the first resistor 100, the second resistor 200, and the fuse 300. The assembly protection cover 400 protects the surfaces of the first resistor 100, the second resistor 200, and the fuse 300. Further, the assembly protective cover 400 functions as a cover for insulating the current flowing through the first resistor 100, the second resistor 200 and the fuse 300 from the outside.

FIG. 8 is a flowchart illustrating an embodiment of a method for manufacturing a fuse resistor assembly according to the present invention.

First, a first resistor and a second resistor that distribute the applied current or voltage are formed (step S500). Here, the first resistor includes a first resistance rod, a first outer resistance cap coupled to one side of the first resistance rod, a first inner resistance cap coupled to the other side of the first resistance rod, and the like. A first resistance wire connecting the first outer resistance cap and the first inner resistance cap while surrounding the first resistance rod may be included. At this time, the first inner resistance cap has a first resistance insertion groove in which a groove for insertion with the other side of the first resistance rod is formed on one side; and one side of the fuse on the other side. It may include a first fuse insertion groove; in which a groove is formed for the insertion of the fuse. Further, the second resistor includes a second resistance rod, a second outer resistance cap coupled to one side of the second resistance rod, a second inner resistance cap coupled to the other side of the second resistance rod, and the above. A second resistance wire connecting the second outer resistance cap and the second inner resistance cap while surrounding the second resistance rod may be included. At this time, the second inner resistance cap has a second resistance insertion groove in which a groove for insertion with the other side of the second resistance rod is formed on one side; and the other side of the fuse on the other side. It may include a second fuse insertion groove; in which a groove is formed for the insertion of the fuse.

The process of forming the first resistor will be described as follows. After connecting the first outer resistance cap and the first inner resistance cap to both ends of the first resistance rod, the first resistance lead wire is connected to one side of the first outer resistance cap. Next, the first outer resistance cap and the first inner resistance cap are connected while surrounding the first resistance rod with the first resistance wire. The process of forming the second resistor is the same as the process of forming the first resistor.

After the S500 step, a fuse blown by the overcurrent generated from the first resistor and the second resistor is coupled in series between the first resistor and the second resistor (step S502). .. The fuse shall be a low melting point metal or alloy, for example, a bar-shaped soluble material containing at least one element of Sn, Ag, Sb, In, Bi, Al, Zn, Cu and Ni. Can be exemplified. The fuse may consist of a ceramic tube tube, terminals formed at both ends of the ceramic tube tube, and a soluble body wire inserted into the ceramic tube tube. One side of the fuse is inserted into the first fuse insertion groove in order to be connected in series with the first fuse insertion groove of the first resistor, and the other side of the fuse is inserted into the second fuse of the second resistor. Since it is connected in series with the groove, it can be inserted into the second fuse insertion groove.

Such a fuse is a stick-shaped fuse rod on which a soluble material coating layer that is blown by an overcurrent is formed. The soluble material coating layer has a trimming pattern formed for adjusting the fusing time due to the overcurrent, and is cut with a different number of cutting points and at least one of the cutting shapes. Is.

After the S502 step, the first resistor, the second resistor, and the fuse are surrounded by an assembly protective cover (step S504). The assembly protective cover is responsible for insulating the current flowing through the first resistor, the second resistor and the fuse.

The fuse resistor assembly 10 according to the present invention has a structure in which a fuse corresponding to a fusible body is located between the resistors in order to connect two winding resistors in series. Explaining such characteristics of the fuse resistance assembly 10 of the present invention, it can be confirmed through tests based on thermal / electrical characteristics such as reflow, surge, and semi-short circuit.

9A to 9H are reference views illustrating the characteristic test of the fuse resistance assembly according to the present invention, and FIG. 10 is a table comparing the comprehensive results related to the characteristic test shown in FIGS. 9A to 9H. ..

With reference to FIGS. 9A to 9H and FIG. 10, the fuse resistance assembly 10 of the present invention is injected using a material of a thermoplastic resin or a thermosetting resin in injection, but is a reflow step. As the process progresses, the durability of the soluble material to external heat can be ensured.

Further, according to the present invention, the soluble material is located inside more than the existing injection product with respect to the heat flowing in from the outside (heat entering on the reflect-wire), so that the influence on the heat from the outside is obtained. The force can be minimized. Also, due to the heat sink effect of the ceramic rods of the first and second resistors arranged on both sides of the fuse, the heat approaching the fuse is temporarily cut off by the first and second resistors. , The influence of external heat can be minimized.

Further, since the position of the fuse is located between the first resistor and the second resistor, the first resistor and the second resistor on both sides of the fuse generate heat during operation, so that one resistor is provided. The fusing time can be shortened as compared with the conventional one provided only.

Further, since the size of the resistor can be minimized, the surge characteristic can be enhanced at the time of winding between the first resistor 100 and the second resistor 200.

Although the preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the above-mentioned specific embodiments, and the present invention is not deviated from the gist of the present invention claimed within the scope of claims by those skilled in the art. Needless to say, it is possible to carry out various modifications, and such modifications should not be individually understood from the technical ideas and perspectives of the present invention.

Claims (8)

The first and second resistors that distribute the applied current or voltage, and
Located between the first resistor and the second resistor, one end face is coupled to the first resistor without a lead wire, and the other end face facing the one end face. Includes a fuse that is coupled to the second resistor without a lead wire and is connected in series with the first resistor and the second resistor.
The fuse is
Stick-shaped fuse rod and
A fusible coating layer coated on the surface of the fuse rod and fused by an overcurrent generated from the first resistor and / or the second resistor .
The first resistor is
1st resistance rod and
The first outer resistance cap coupled to one side of the first resistance rod,
The first inner resistance cap coupled to the other side of the first resistance rod,
A first resistance wire connecting the first outer resistance cap and the first inner resistance cap while surrounding the first resistance rod is included.
The second resistor is
With the second resistance rod
A second outer resistance cap coupled to one side of the second resistance rod,
The second inner resistance cap coupled to the other side of the second resistance rod,
A second resistance wire connecting the second outer resistance cap and the second inner resistance cap while surrounding the second resistance rod is included.
The first inner resistance cap is
A first resistance insertion groove having a groove formed on one side for insertion with the other side of the first resistance rod,
Includes a first fuse insertion groove in which a groove for insertion with one side of the fuse rod is formed on the other side.
The second inner resistance cap is
A second resistance insertion groove having a groove formed on one side for insertion with the other side of the second resistance rod,
A fuse resistor assembly comprising a second fuse insertion groove formed on the other side with a groove for insertion with the other side of the fuse rod . The soluble material coating layer is
The fuse resistance assembly according to claim 1, wherein the surface of the fuse rod is coated with a tin component. The soluble material coating layer is
The fuse resistor assembly according to claim 1, wherein a trimming pattern is formed for adjusting the fusing time due to the overcurrent. The trimming pattern is
The fuse resistance assembly according to claim 3 , wherein at least one of the number of cutting points and the cutting shape is different from each other. The fuse resistance assembly according to claim 1, further comprising the first resistor, the second resistor, and an assembly protective cover surrounding the fuse. The stage of forming the first and second resistors that distribute the applied current or voltage, and
A fuse blown by the overcurrent generated from the first resistor and / or the second resistor is coupled to the first resistor with one end face not via a lead wire and the one end face. A step of connecting in series between the first resistor and the second resistor so that the end face on the other side facing the second resistor is coupled to the second resistor without passing through a lead wire .
Including a step of surrounding the first resistor, the second resistor and the fuse with an assembly protective cover.
One side of the fuse is inserted into the first inner resistance cap constituting the first resistor, and the other side of the fuse is inserted into the second inner resistance cap constituting the second resistor.
The fuse is
It is characterized in that a soluble material coating layer that is blown by an overcurrent is formed on a stick-shaped fuse rod.
The step of connecting the fuse in series between the first resistor and the second resistor is
A first resistance insertion groove having a groove for insertion with the other side of the first resistance rod was formed on one side, and a groove for insertion with one side of the fuse rod was formed on the other side. The first resistor including the first fuse insertion groove is connected in series with the fuse.
The step of connecting the fuse in series between the first resistor and the second resistor is
A second resistance insertion groove having a groove for insertion with the other side of the second resistance rod was formed on one side, and a groove for insertion with the other side of the fuse rod was formed on the other side. A method for manufacturing a fuse resistor assembly , which comprises connecting the second resistor including the second fuse insertion groove in series with the fuse. The soluble material coating layer is
The method for manufacturing a fuse resistor assembly according to claim 6 , wherein a trimming pattern is formed for adjusting the fusing time due to the overcurrent. The trimming pattern is
The method for manufacturing a fuse resistance assembly according to claim 7 , wherein at least one of the number of cutting points and the cutting shape is different from each other.

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