TW201624504A - Fuse resistor and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a fuse resistor and a manufacturing method thereof. More particularly, the fuse resistor is installed to the electric circuit of electronic products so that it prevents device error generated due to an inrush current, an increase in internal temperature, and continuous overcurrent, etc. It can simplify a manufacturing process because a temperature fuse module is inserted into an insertion groove prepared in a molding part.

Description

Fuse resistor and method of manufacturing same

The present invention relates to a fuse resistor and a method of manufacturing the same, and more particularly to a thermal fuse caused by a circuit disposed in an electronic product to prevent surge current, internal temperature rise, continuous overcurrent, etc. The assembly is embedded in the insertion groove of the molding portion and assembled, so that the process of the fuse resistor and the method of manufacturing the same can be simplified.

Generally, in the circuit of large-scale electronic products such as LCD TVs and PDP TVs, in order to prevent machine faults caused by surge currents, internal temperature rise, continuous overcurrent, etc., when the power is turned on, the power input terminal of the circuit is set as The fuse resistor protects the power circuit.

Such a fuse resistor first has a resistor body and a temperature fuse, and the resistor body and the temperature fuse are connected in series to each other through a wire.

Further, in the fuse resistor, in order to prevent other electronic components from being affected by the debris generated when the fuse element layer is blown, the resistor body and the temperature fuse are packaged with the case, and the inside of the case is filled with the filler.

Among them, in consideration of heat resistance, conductivity, thermosetting property and the like, the filler uses a slurry filler containing cerium oxide (SiO ₂ ), which is generally used as a ceramic material casing of a general resistor housing.

In addition, the ends of the wire extend to be led out to the outside of the housing, in conventional insurance In the wire resistor, the end of the wire is soldered to the printed circuit board, whereby the resistor body and the temperature fuse are placed on the printed circuit board in an upright state.

Therefore, the fuse resistor as described above restricts it to a predetermined current by the resistor body when the surge current flows, and short-circuits the circuit when the overcurrent flows, so that heat generated by heat generation of the resistor body is transmitted to the temperature through the filler. The fuse fuses a fuse element layer composed of solid lead or polymer pellets provided inside the thermal fuse to protect the circuit of the home appliance.

FIG. 5a and FIG. 5b are schematic diagrams showing a conventional fuse resistor. For reference, Korean Patent Application No. 10-1060013 discloses a fuse resistor comprising: a resistor body 10; a temperature fuse 20, The circuit is short-circuited by the heat generated by the resistor body 10; the wires 31, 33 are connected in series with the resistor body 10 and the thermal fuse 20; the housing 40 is open on one side, and a lead-out groove for drawing the wire is formed on one wall surface 41, thereby accommodating the resistor body 10 and the thermal fuse 20 inside with the ends of the wires 32, 34 drawn to the outside; the filler 50, which is filled inside the casing 40, contains ruthenium dioxide, the resistor body 10, and the temperature The fuse 20 is inserted into its interior.

However, the Korean Patent Application discloses a structure in which a circuit board and a temperature fuse are adjacent to each other. Therefore, the temperature fuse may be blown by heat generated during soldering, and the lead 31 of the resistor body and the lead of the temperature fuse 33 The process performed is cumbersome, difficult to automate, and there is a risk of wire breakage in the wires 31, 33 during assembly.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a temperature fuse and a method of manufacturing the same, which are mounted on a surface of a substrate and connected to a resistor, thereby preventing connection failure during manufacturing, and setting a temperature. Insert the fuse assembly into the molding section It is inserted into the tank and assembled, thus simplifying the process.

In order to achieve the above object, a fuse resistor according to the present invention includes: a resistor body; a first wire and a second wire connected to the resistor body; a molding portion having an insertion groove formed at one side thereof; and a temperature fuse assembly Inserting into the insertion slot, and including a substrate formed with a first terminal and a second terminal, and a thermal fuse disposed on the first terminal and the second terminal, the first wire being replaced by the first wire portion and the second wire The electric wire portion is configured such that one end of the first electric wire portion is connected to the electric resistance body, and the other end forms a first end portion protruding from an upper side of the insertion groove, and one end of the second electric wire portion is formed to protrude from a lower side of the insertion groove And a second end portion spaced apart from the first end portion, the other end is drawn from a lower side of the molding portion, and the first terminal and the second terminal are respectively connected to the first end portion and the second end portion.

Further, wherein the thermal fuse assembly of the fuse resistor of the present invention includes a housing bonded to the substrate.

Further, in the housing of the fuse resistor according to the present invention, a temperature fuse housing groove for housing the temperature fuse is formed, and a space is formed between the temperature fuse housing groove and the temperature fuse.

Further, wherein the housing of the fuse according to the present invention has a blocking portion disposed between the first terminal and the second terminal and interposed between the first end portion and the second end portion; the first terminal The slot and the second terminal slot are located on both sides of the blocking portion, and the first terminal and the second terminal are exposed to the outside.

Further, in the housing of the fuse resistor according to the present invention, a coupling protrusion is formed, and the insertion groove is formed with a coupling groove into which the coupling protrusion is hooked.

Further, a method of manufacturing a fuse resistor according to the present invention includes the steps of: mounting a resistor body incorporating a first wire and a second wire in a mold, and injecting the mold into the mold Inserting a resin to form a molding portion, one side of the molding portion forming an uninserted insertion groove to expose a portion of the first wire; and cutting the first wire exposed from the insertion groove to be separated into a first wire And the second electric wire portion projecting the first end portion and the second end portion of the cut portion of the first electric wire portion and the second electric wire portion toward the vertical direction of the insertion groove; preparing a thermal fuse assembly, the thermal fuse assembly a substrate formed with a first terminal and a second terminal, a thermal fuse disposed on the first terminal and the second terminal, and a housing coupled to the substrate; the thermal fuse assembly is embedded in the insertion slot And connecting the first terminal and the second terminal to the first end and the second end, respectively.

Further, a method of manufacturing a fuse resistor according to the present invention includes the steps of: preparing a resistor body to which a first wire and a second wire are bonded, and cutting a portion of the first wire to be separated into a first wire portion and a second electric wire portion; separating the first electric wire portion and the second electric wire portion from each other, and mounting the electric resistance body into a mold; injecting resin into the mold to form a molding portion, at one side of the molding portion Forming an insertion groove such that the first end portion and the second end portion of the cut portion of the first electric wire portion and the second electric wire portion are not molded and exposed to the outside; preparing a thermal fuse assembly formed of a substrate of the first terminal and the second terminal, a thermal fuse disposed on the first terminal and the second terminal, and a housing coupled to the substrate; the thermal fuse assembly is embedded in the insertion slot, and the The first terminal and the second terminal are connected to the first end and the second end, respectively.

According to the fuse resistor of the present invention as described above and the method of manufacturing the same, the thermal fuse is mounted on the surface of the substrate to be connected to the resistor body, thereby preventing connection failure during the manufacturing process, and inserting the thermal fuse assembly into the insertion groove of the molding portion And assembly, so it can simplify and automate the process.

10‧‧‧Resistive body

20‧‧‧Temperature Fuse Assembly

31‧‧‧ wire

32‧‧‧Wire

33‧‧‧Wire

34‧‧‧Wire

40‧‧‧shell

41‧‧‧ lead slot

50‧‧‧Filling

100‧‧‧Fuse resistor

110‧‧‧Resistor body

111‧‧‧First wire

112‧‧‧First Wire Department

113‧‧‧ first end

114‧‧‧Second wire department

115‧‧‧second end

116‧‧‧Departure

117‧‧‧second wire

120‧‧‧Forming Department

121‧‧‧ Insert slot

122‧‧‧ Combination slot

130‧‧‧Temperature Fuse Assembly

131‧‧‧Substrate

132‧‧‧First terminal

132a‧‧‧second terminal

133‧‧‧ solder

134‧‧‧Resistor body connection

135‧‧‧Temperature fuse connection

137‧‧‧temperature fuse

140‧‧‧shell

141‧‧‧Blocking

142‧‧‧First terminal slot

142a‧‧‧second terminal slot

143‧‧‧Temperature fuse storage slot

144‧‧‧Separation space

145‧‧‧Combined protrusions

Fig. 1a is a perspective view showing a fuse resistor according to the present invention.

Fig. 1b is an exploded perspective view of Fig. 1a.

Fig. 1c is a cross-sectional view taken along line A-A of Fig. 1a.

Fig. 2a is a perspective view showing the thermal fuse assembly of the present invention.

Fig. 2b is a cross-sectional view taken along line B-B of Fig. 2a.

Fig. 2c is a cross-sectional view taken along line C-C of Fig. 2a.

Fig. 3a is a schematic view showing a state after the electric resistance body of the present invention is molded.

Fig. 3b is a schematic view showing a state after the first wire of the present invention is cut.

[Fig. 3c] is a cross-sectional view showing a state in which the thermal fuse assembly cut in the D-D direction in Fig. 2a is inserted into the insertion groove.

[Fig. 3d] is a cross-sectional view showing a state in which the thermal fuse assembly cut in the E-E direction in Fig. 2a is fitted into the insertion groove.

[Fig. 4a] is a schematic view showing the resistor body in a state where the first wire of the present invention is cut.

Fig. 4b is a schematic view showing a state in which a molded portion is formed on the resistor body of the present invention.

[Fig. 5a] is a schematic view showing a conventional fuse resistor.

[Fig. 5b] is a schematic view showing a conventional fuse resistor.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In the description of the present invention, it is to be understood that the detailed description of the related features or structures may be unnecessarily obscured. In addition, after The terminology is a term defined in consideration of its function in the present invention, and may vary depending on the user, the intention of the user, or the jurisprudence. Therefore, the definition is to be determined in accordance with the entire contents of this specification.

Fig. 1a is a perspective view showing a fuse resistor according to the present invention, Fig. 1b is an exploded perspective view of Fig. 1a, and Fig. 1c is a cross-sectional view taken along line A-A of Fig. 1a. 2a is a perspective view showing a thermal fuse assembly of the present invention, and FIGS. 2b and 2c are a cross-sectional view taken along line B-B and a cross-sectional view taken along line C-C of FIG. 2a.

Referring to FIGS. 1a and 1b, a fuse resistor 100 according to the present invention is used in a circuit of an electronic product, and generally includes a resistor body 110, a molding portion 120, and a temperature fuse assembly 130.

The first wire 111 and the second wire 117 are disposed at both ends of the resistor body 110.

The first wire 111 is composed of a first wire portion 112 directly connected to the resistor body 110 and a second wire portion 114 spaced apart from the first wire portion 112 and drawn from the lower side of the molding portion 120.

The molded portion 120 functions as a casing of the resistor body 110, and seals the resistor body 110 and a part of the first and second wires 111 and 117, and is exemplified by a synthetic resin material. However, the present invention is not limited thereto. Further, the first and second wires 111 and 117 are bent in the molded portion 120 and taken out from the lower side of the molded portion 120.

One side of the molding portion 120 is formed with an insertion groove 121 into which the thermal fuse assembly 130 is coupled.

The first end portion 113 of the first electric wire portion 112 protrudes from the upper side of the insertion groove 121, and the second end portion 115 of the second electric wire portion 114 protrudes from the lower side.

A partition 116 is formed between the first end portion 113 and the second end portion 115.

1a to 2c, the thermal fuse assembly 130 is formed in a structural form fitted into the insertion groove 121, and is generally constituted by a substrate 131, a temperature fuse 137, and a housing 140.

The first and second terminals 132 and 132a are formed on one surface of the substrate 131, and the first and second terminals 132 and 132a are connected to the first and second end portions 113 and 115, respectively. Specifically, as shown in FIGS. 2a and 3c, the first and second terminals 132, 132a are connected to the resistance body connecting portion 134 of the first and second end portions 113, 115 in a central region of the substrate 131. A temperature fuse connection portion 135 extending from one side of the resistor body connecting portion 134 and connected to the temperature fuse 137 is formed.

The temperature fuse 137 is disposed on the first and second terminals 132 and 132a, is connected in series with the resistor body 110, and is blown through the heat generated by the resistor body 110 to short-circuit the circuit, thereby protecting the components disposed in the circuit. effect. That is, the temperature fuse 137 is connected in series with the resistor body 110 through the first and second terminals 132 and 132a.

The case 140 is coupled to one surface of the substrate 131 and disposed inside the insertion groove 121. The substrate 131 is disposed outside the insertion groove 121.

A coupling protrusion 145 may be formed on an outer surface of the housing 140, and a coupling groove 122 is formed on the insertion groove so that the coupling protrusion 145 is fitted.

Further, an example in which the casing 140 is made of an insulating material such as a synthetic resin or a ceramic material may be used, and a blocking portion 141, a first terminal groove 142, a second terminal groove 142a, and a temperature fuse housing groove 143 are formed.

The blocking portion 141 is disposed between the first and second terminals 132 and 132a and inserted between the first and second end portions 113 and 115 to physically cut off the first and second end portions. 113, 115.

The first and second terminal slots 142 and 142a are spaces on both sides of the blocking portion 141, and the first and second terminals 132 and 132a can be exposed to the outside to be coupled to the first and second end portions 113, 115.

The temperature fuse housing groove 143 is for accommodating the temperature fuse 137. Preferably, a temperature fuse is formed between the temperature fuse housing groove 143 and the temperature fuse 137 to form a space 144 for melting through the heat of the resistor body 110. 137 can be disconnected (short circuit).

As described above, in the present invention, the thermal fuse assembly formed as a structure can be connected to the resistor body and the thermal fuse by a simple assembly process of inserting it into the insertion groove.

Hereinafter, an embodiment of a method of manufacturing a fuse resistor according to the present invention will be described in detail with reference to the drawings. Detailed descriptions are omitted for the same or similar components as those described above.

Fig. 3a is a schematic view showing a state after molding of the resistor body of the present invention, Fig. 3b is a schematic view showing a state after cutting of the first wire of the present invention, and Fig. 3c is a view showing insertion of a thermal fuse assembly cut in the DD direction of Fig. 2a. Fig. 3d is a cross-sectional view showing a state in which the thermal fuse assembly cut in the EE direction in Fig. 2a is fitted into the insertion groove.

Referring to Fig. 3a, in the method of manufacturing a fuse resistor according to the present invention, the resistor body 110 incorporating the first and second wires 111 and 117 is mounted in a mold, and the molding portion is formed by injecting a resin into the mold. 120. One side of the molding portion 120 is formed with an insertion groove 121 that is not injection molded to expose a part of the first wire 111.

Referring to FIG. 3b, the first wire 111 is cut to be separated into a first wire portion 112 and a second wire portion 114 such that the first end portion 113 of the first wire portion 112 and the second end portion 115 of the second wire portion 114 face The insertion groove 121 protrudes in the vertical direction, and a partition portion 116 is formed between the first end portion 113 and the second end portion 115.

Referring to FIG. 3c, preparation is made by the first terminal 132 and the second terminal 132a. The substrate 131, the thermal fuse 137 disposed on the first terminal 132 and the second terminal 132a, and the thermal fuse assembly 130 formed by the housing 140 coupled to the substrate 131, the thermal fuse assembly 130 is embedded in the insertion slot 121 The first and second terminals 132 and 132a are connected to the first and second terminal portions 113 and 115, respectively.

More specifically, the blocking portion 141 of the housing 140 is inserted into the insertion slot 121 through the partition portion 116, and the first and second terminals 132, 132a are in contact with the first and second end portions 113, 115, the first The second terminals 132 and 132a are formed on the substrate 131 and exposed from the first and second terminal grooves 142 and 142a arranged up and down with reference to the blocking portion 141. At this time, the first and second terminals 132 and 132a are coated with solder 133, and are welded and joined to the first and second end portions 113 and 115.

Referring to FIG. 3d, the coupling protrusion 145 formed on the housing 140 may be embedded in the coupling groove 122 formed in the insertion groove 121 to fix the temperature fuse assembly 130, although not shown, but also in the housing The outer surface of 140 is coated with an adhesive material to secure the thermal fuse assembly 130.

4a is a schematic view showing the resistor body in a state where the first wire of the present invention is cut, and FIG. 4b is a schematic view showing a state in which the molded portion is formed on the resistor body of the present invention.

Referring to FIG. 4a and FIG. 4b, in the manufacturing method of the fuse resistor according to the embodiment, first, the resistor body 110 to which the first and second wires 111 and 117 are bonded is prepared, and a part of the first wire 111 is cut to be separated into A wire portion 112 and a second wire portion 114.

Then, the first electric wire portion 112 and the second electric wire portion 114 are spaced apart from each other, and the electric resistance body 110 is mounted in a mold, and resin is injected into the mold to form the molding portion 120.

At this time, an insertion groove 121 is formed on one side of the molding portion 120 such that the first and second end portions 113, 115 of the cut portions of the first and second lead portions 112, 114 are not injection molded to the outside. Exposed.

Then, as described above with reference to FIGS. 3b and 3c, the substrate 131 on which the first and second terminals 132 and 132a are formed, and the temperature fuse 137 provided on the first terminal 132 and the second terminal 132a are prepared and integrated. The thermal fuse assembly 130 formed on the housing 140 of the substrate 131, the thermal fuse assembly 130 is embedded in the insertion slot 121, and the first and second terminals 132, 132a are respectively connected to the first and second ends. Parts 113, 115.

That is, the present embodiment is different from the previously described embodiment in that the first lead wire is cut before the molded portion is formed.

The conclusion is that the conventional fuse resistor is manufactured by the wire on the resistor body and the wire on the thermal fuse, and the combination of the resistor body and the thermal fuse is embedded in the casing, and the filler is filled inside the casing; However, in the present invention, instead of the filler, the molded portion is formed by injection molding, and a thermal fuse assembly having a temperature fuse mounted on the surface of the substrate is prepared, and the thermal fuse assembly is inserted into the insertion groove on the molding portion, thereby simplifying the assembly process. The advantages.

On the other hand, the specific embodiments have been described in the specification and drawings of the present invention, but the present invention is not limited to the disclosed embodiments, and those having ordinary knowledge in the technical field to which the present invention pertains, Many alternatives, modifications, and changes can be made without departing from the spirit of the invention. Therefore, the scope of the invention should not be limited to the illustrated embodiment, but should include the scope of the claims and the scope thereof.

100‧‧‧Fuse resistor

111‧‧‧First wire

117‧‧‧second wire

120‧‧‧Forming Department

130‧‧‧Temperature Fuse Assembly

131‧‧‧Substrate

140‧‧‧shell

Claims (7)

A fuse resistor, comprising: a resistor body; a first wire and a second wire connected to the resistor body; a molding portion having an insertion groove formed at one side thereof; a thermal fuse assembly embedded Into the insertion slot, and comprising a substrate formed with a first terminal and a second terminal, and a thermal fuse disposed on the first terminal and the second terminal, wherein the first wire is composed of a first wire portion and a second electric wire portion, one end of the first electric wire portion is connected to one side of the electric resistance body, and the other end is formed with a first end portion protruding from an upper side of the insertion groove, and one end of the second electric wire portion is formed from the first wire portion a second end portion of the insertion groove protruding from the lower end and separated from the first end portion, and the other end is drawn from the lower side of the molding portion, wherein one end of the second wire is connected to the other side of the resistance body And the other end is drawn from a lower side of the molding portion, wherein the first terminal and the second terminal are respectively connected to the first end portion and the second end portion. The fuse resistor of claim 1, wherein the thermal fuse assembly further comprises a housing coupled to the substrate. The fuse resistor of claim 2, wherein the housing is formed with a thermal fuse receiving groove for receiving the thermal fuse, and a space is formed between the thermal fuse receiving groove and the thermal fuse. The fuse resistor of claim 2, wherein the housing has a blocking portion between the first terminal and the second terminal and is interposed between the first end and the second end ;as well as A first terminal slot and a second terminal slot are located on opposite sides of the blocking portion to expose the first terminal and the second terminal to the outside. The fuse resistor of claim 2, wherein the housing is formed with a coupling protrusion, and the insertion groove is formed with a coupling groove, and the coupling protrusion is buckled into the coupling groove. A manufacturing method of a fuse resistor, comprising the steps of: mounting a resistor body combined with a first wire and a second wire into a mold, injecting resin into the mold to form a molding portion, and a molding portion Forming an insertion groove that is not injection molded to expose a portion of the first wire; cutting the first wire exposed from the insertion groove to be separated into a first wire portion and a second wire portion, and The first end portion and the second end portion of the cut portion of the first electric wire portion and the second electric wire portion protrude toward the upper and lower sides of the insertion groove; a thermal fuse assembly is prepared, and the thermal fuse assembly is formed with a first terminal And a substrate of a second terminal, a thermal fuse disposed on the first terminal and the second terminal, and a housing coupled to the substrate; the thermal fuse assembly is embedded in the insertion slot, and the first The terminal and the second terminal are connected to the first end and the second end, respectively. A manufacturing method of a fuse resistor, comprising the steps of: preparing a resistor body combined with a first wire and a second wire, and cutting a portion of the first wire to be separated into a first wire portion and a first wire a second electric wire portion; separating the first electric wire portion and the second electric wire portion from each other, and mounting the electric resistance body into a mold; Injecting a resin into the mold to form the molding portion, and at this time, an insertion groove is formed at one side of the molding portion such that the first end portion and the second end of the cut portion of the first electric wire portion and the second electric wire portion are The portion is not exposed to the outside and is exposed to the outside; a thermal fuse assembly is prepared, the thermal fuse assembly is formed by a substrate having a first terminal and a second terminal, a thermal fuse disposed on the first terminal and the second terminal, and a combination A housing is formed on the substrate; the thermal fuse assembly is embedded in the insertion slot, and the first terminal and the second terminal are coupled to the first end and the second end, respectively.