CN109712764B - Alloy resistor and preparation method thereof - Google Patents
Alloy resistor and preparation method thereof Download PDFInfo
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- CN109712764B CN109712764B CN201910084629.1A CN201910084629A CN109712764B CN 109712764 B CN109712764 B CN 109712764B CN 201910084629 A CN201910084629 A CN 201910084629A CN 109712764 B CN109712764 B CN 109712764B
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Abstract
The invention discloses an alloy resistor and a preparation method thereof. Meanwhile, the inner surface of the groove forms a radiating surface of the resistor body in the resistance repairing area, so that the radiating area is maximized, and in addition, when the resistor is installed on the PCB, due to the support of the electrodes at the two ends, a larger gap is formed between the resistance repairing area and the PCB, the radiating efficiency of a product is improved, the temperature of the surface of the product is reduced, and the power of the resistor is improved. According to the preparation method, the alloy material and the electrode material of the resistor body are compositely rolled into the composite strip, the electrode material is removed, the groove is etched to form the resistance trimming area, the structural integrity is guaranteed, the integrity of the heat dissipation structure is kept, and the alloy resistor with high resistance precision can be formed by adjusting the groove.
Description
Technical Field
The invention belongs to the field of electronic elements, and particularly relates to a high-power alloy resistor and a preparation method thereof.
Background
The resistor is an indispensable electronic component in the circuit, and the resistor is also a power device at the same time. When the circuit works, the heating temperature of the resistor rises, and if the heat dissipation is not timely, the temperature rises sharply, so that the resistance precision of the resistor is influenced, and certain interference is caused to the detection of the IC.
The resistor generally comprises a resistor body in the middle and electrodes on two sides, and the resistor generates heat in the middle, conducts the heat to the electrodes and then conducts the heat to the PCB through the electrodes. Factors influencing the heat transfer in this process are the temperature difference across, the heat transfer area and the material heat transfer coefficient. Among these three factors, the thermal conductivity of a material is substantially constant after the material is selected; the resistor is a heating source, and the temperature difference between two sides of the product is basically fixed and unchanged; the heat exchange area is the most important factor influencing the heat dissipation of the resistor.
In order to realize accurate measurement of electrical signals, the requirement on the precision of the resistance value is high. Generally, the high-precision requirement of the resistor is realized through resistance trimming, as shown in fig. 6, a traditional resistance trimming mode is to form a notch in the middle of a product, and although a high-precision resistance value can be obtained, the middle resistor is large, heat generation is intensified, and the resistance trimming often has half the effort.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects of the prior art, the invention provides an alloy resistor which realizes high-precision resistance value and has high heat dissipation efficiency.
The invention also aims to provide a preparation method of the alloy resistor.
The technical scheme is as follows: the alloy resistor comprises a resistor body and two electrodes, wherein the two electrodes are positioned at two ends of one surface of the resistor body and protrude from the surface, the surface of the resistor body between the two electrodes is provided with a plurality of grooves which are sunken from the surface to the interior of the resistor body, the grooves are used as a resistance trimming area of the resistor body, and the inner surfaces of the grooves form a radiating surface of the resistor body in the resistance trimming area.
Has the advantages that: according to the alloy resistor, the grooves are arranged on one surface of the resistor body and serve as resistance trimming areas of the resistor body, the resistance of a product is finely adjusted by adjusting the grooves, and the high-precision resistance is obtained. Meanwhile, the inner surface of the groove forms a radiating surface of the resistor body in the resistance repairing area, so that the radiating area is maximized, and in addition, when the resistor is installed on the PCB, due to the support of the electrodes at the two ends, a larger gap is formed between the resistance repairing area and the PCB, the radiating efficiency of a product is improved, the temperature of the surface of the product is reduced, and the power of the resistor is improved.
The resistor body is of a sheet-shaped rectangular structure, the resistance trimming area is a rectangular area, and the grooves are uniformly distributed in the rectangular area. Thereby avoid appearing the condition of local resistance grow for the heat dissipation of product is even, and the difference in temperature at product both ends is unanimous.
The groove extends in the width direction of the resistor body and is formed to penetrate therethrough. The heat can be radiated outwards from the groove penetrating position of the end face of the resistor body, and the heat radiation efficiency is further improved.
The technical scheme adopted by the preparation method of the alloy resistor comprises the following steps:
(1) in a protective atmosphere, compositely rolling an alloy material and an electrode material to form a composite strip;
(2) removing the middle area of the electrode material of the composite strip, exposing the alloy area and forming electrodes at two ends of the alloy area;
(3) dividing the composite strip according to the overall dimension of the alloy resistor;
(4) etching a plurality of grooves on the rectangular alloy area, and adjusting the resistance value of the product to a target value;
(5) and forming a passivation layer on the surface by adopting a passivation mode to obtain the material.
Has the advantages that: according to the preparation method, the alloy material and the electrode material of the resistor body are compositely rolled into the composite strip, the resistance trimming area is formed by removing the electrode material and etching the groove, the structural integrity is ensured, the area with enlarged local resistance is avoided, and the integrity of the heat dissipation structure is maintained to the greatest extent. The preparation method is simple, and the alloy resistor with higher resistance precision can be formed by adjusting the etching depth of the groove.
Drawings
FIG. 1 is a schematic perspective view of an alloy resistor according to the present invention;
FIG. 2 is a schematic diagram of a side view of the alloy resistor of the present invention;
FIG. 3 is a bottom view of the alloy resistor of FIG. 2;
FIG. 4 is a schematic diagram of a composite strip in the process of making an alloy resistor according to the present invention;
FIG. 5 is a schematic view of the composite strip with the intermediate region of electrode material removed during the alloy resistor fabrication process of the present invention;
FIG. 6 is a schematic diagram of a conventional alloy resistance trimming method.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 to 3, the present embodiment discloses an alloy resistor, which includes a resistor body 1 and two electrodes 2, wherein the resistor body 1 is a sheet-shaped rectangular structure resistor body made of an alloy material, the electrodes 2 are rectangular sheet-shaped electrodes made of a copper material, the two electrodes 2 are respectively located at two ends of one surface of the resistor body 1 and protrude from the surface, long sides of the electrodes 2 are equal to short sides of the resistor body 1, and long sides of the two electrodes 2 are respectively disposed in close contact with the short sides of the two ends of the resistor body 1.
The surface of the resistor between the two electrodes 2 is provided with a plurality of grooves 3 recessed from the surface into the resistor 1, the plurality of grooves 3 serve as resistance correction regions of the resistor, and the inner surfaces of the grooves 3 form heat radiation surfaces of the resistor in the resistance correction regions.
The surface of the resistor body between the two electrodes 2 is a rectangular area, and a plurality of grooves 3 are uniformly distributed in the rectangular area. Thereby avoid appearing the condition of local resistance grow for the heat dissipation of product is even, and the difference in temperature at product both ends is unanimous. Further, the groove 3 extends along the width direction of the resistor body 1 and is penetrated, so that heat can be radiated outwards from the penetrating position of the groove 3 on the end face of the resistor body 1, and the heat radiation efficiency is further improved.
Meanwhile, the embodiment also discloses a preparation method of the alloy resistor, which comprises the following steps:
(1) under a protective atmosphere, forming a composite strip shown in FIG. 4 by hot composite rolling the alloy material 10 and the copper electrode material 20;
(2) referring to fig. 5, the middle region of the electrode material 20 of the composite strip is removed mechanically or by laser to expose the alloy region and form electrodes 2 at both ends of the alloy region;
(3) dividing the composite strip in the step according to the overall dimension of the alloy resistor;
(4) etching a plurality of grooves 3 on the rectangular alloy area from which the electrode material 20 is removed in a mechanical or laser manner to form a trimming area, wherein the plurality of etched grooves 3 are uniformly distributed in the rectangular area, and adjusting the resistance value of the product to a target value;
(5) and forming a passivation layer on the surface in a passivation mode to prevent the surface of the alloy resistor from being oxidized, and thus obtaining the alloy resistor.
Claims (3)
1. An alloy resistor is characterized by comprising a resistor body and two electrodes, wherein the two electrodes are positioned at two ends of one surface of the resistor body and protrude from the surface, the surface of the resistor body between the two electrodes is provided with a plurality of grooves which are sunken from the surface to the interior of the resistor body, the grooves are used as a resistance trimming area of the resistor body, and the inner surfaces of the grooves form a heat dissipation surface of the resistor body in the resistance trimming area; the surface of the resistor body between the two electrodes is a rectangular area, and the grooves are uniformly distributed in the rectangular area; the groove extends in the width direction of the resistor body and is formed to penetrate therethrough.
2. The alloy resistor according to claim 1, wherein said electrodes are rectangular chip electrodes, and the long sides of the electrodes are equal to the short sides of said resistors.
3. A method for producing an alloy resistor according to any one of claims 1-2, characterized in that it comprises the following steps:
(1) in a protective atmosphere, compositely rolling an alloy material and an electrode material to form a composite strip;
(2) removing the middle area of the electrode material of the composite strip, exposing the alloy area and forming electrodes at two ends of the alloy area;
(3) dividing the composite strip according to the overall dimension of the alloy resistor;
(4) etching a plurality of grooves on the rectangular alloy area, and adjusting the resistance value of the product to a target value;
(5) and forming a passivation layer on the surface by adopting a passivation mode to obtain the material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910084629.1A CN109712764B (en) | 2019-01-28 | 2019-01-28 | Alloy resistor and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910084629.1A CN109712764B (en) | 2019-01-28 | 2019-01-28 | Alloy resistor and preparation method thereof |
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| Publication Number | Publication Date |
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| CN109712764A CN109712764A (en) | 2019-05-03 |
| CN109712764B true CN109712764B (en) | 2020-09-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910084629.1A Active CN109712764B (en) | 2019-01-28 | 2019-01-28 | Alloy resistor and preparation method thereof |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112002509A (en) * | 2020-08-11 | 2020-11-27 | 深圳市业展电子有限公司 | Forming process of chip resistor |
| CN111926266A (en) * | 2020-08-14 | 2020-11-13 | 苏州利昇达电子科技有限公司 | Alloy resistor with strong anti-interference performance and manufacturing method thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01209703A (en) * | 1988-02-18 | 1989-08-23 | Mitsubishi Electric Corp | Resistance value control apparatus of thick film resistor |
| JPH03114170A (en) * | 1989-09-28 | 1991-05-15 | Tdk Corp | Thermistor device with positive characteristic |
| JPH0529101A (en) * | 1991-07-24 | 1993-02-05 | Nec Corp | Thick film resistor |
| CN103093908B (en) * | 2007-09-27 | 2017-04-26 | 韦沙戴尔电子公司 | Power resistor |
| CN204966192U (en) * | 2015-08-25 | 2016-01-13 | 深圳市毫欧电子有限公司 | Resistor |
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