CN209927932U - Four-wire current sensing resistor - Google Patents
Four-wire current sensing resistor Download PDFInfo
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- CN209927932U CN209927932U CN201920212536.8U CN201920212536U CN209927932U CN 209927932 U CN209927932 U CN 209927932U CN 201920212536 U CN201920212536 U CN 201920212536U CN 209927932 U CN209927932 U CN 209927932U
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Abstract
The utility model discloses a four-wire current sensing resistor, through set up the protective layer on the resistance board surface, the protective layer main part and two protective layer flank parts of protective layer form cross and cut off four electrode holding regions of resistance board surface partition, two current input electrodes and two voltage detection electrodes set up respectively in four electrode regions, thereby avoid etching the higher recess of required precision in resistance board both sides for separating the electrode, reduce four-wire current sensing resistor's the manufacturing degree of difficulty, improve the product yield. Meanwhile, notches are arranged at two end parts of the resistance plate, the temperature coefficient of the resistance is adjusted by adjusting the depth of the notches, and the TCR of the resistance is reduced.
Description
Technical Field
The utility model relates to a current sensing resistance, concretely relates to four-wire formula current sensing resistance of high resistance value precision, low TCR.
Background
The working principle of the current sensing resistor is that the resistor is connected in series in a load circuit, the voltage drop generated on the resistor is measured when power is supplied to the load, and the current intensity flowing through the circuit is calculated by ohm's law. The resistor is a heating element, and in order to reduce energy dissipation in the normal working process, the resistance value of the current sensing resistance device is designed to be smaller, about milliohm, so that the requirement on the resistance value precision is higher than that of a common resistor (within +/-1%).
The resistor is a heating element, the temperature of the resistor body can reach more than 100 ℃ due to heating of the resistor body and heat dissipation of other elements in a working environment in the actual working process, and in order to ensure the measurement stability of the resistor under different temperature conditions, the more The Change Rate (TCR) of the resistance value of the resistor along with the temperature approaches to 0, the more beneficial the obtained measurement result is.
According to the existing four-wire current sensing resistor structure, the electrode is divided into four parts through four grooves, namely an upper groove, a lower groove, a left groove and a right groove, in actual work, two relatively large electrodes at two positions are used as current input ends, and the remaining two small electrodes are used as voltage detection ends. In the actual operation process, the four grooves are formed by etching the resistance plate, and the left and right grooves have high requirements on the precision of etching equipment due to small sizes. The existing four-wire current sensing resistor has high manufacturing difficulty, low yield and high manufacturing cost.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: in order to overcome the defects of the prior art, the utility model provides a four-wire current sensing resistor, this current sensing resistor manufacturing process is simple, and resistance precision is high and TCR is lower.
The technical scheme is as follows: the four-wire current sensing resistor of the utility model comprises an insulating substrate, a resistor plate arranged on the surface of the insulating substrate, a protective layer, two current input electrodes and two voltage detection electrodes; the resistor plate is a rectangular resistor plate, and the middle parts of two short sides of the rectangular resistor plate are provided with notches which are penetrated in the thickness direction of the resistor plate; the protective layer is attached to the surface of the resistor plate, the protective layer is provided with a protective layer main body extending from a notch of a short edge at one end of the resistor plate to a notch of a short edge at the other end of the resistor plate, two protective layer side wings extending from the protective layer main body to two long edges of the resistor plate respectively, and the protective layer main body and the two protective layer side wings form a cross partition to separate four electrode accommodating areas from the surface of the resistor plate; the two current input electrodes are respectively arranged in two electrode accommodating areas at the same end of the resistance plate, and the two voltage detection electrodes are respectively arranged in the other two electrode accommodating areas.
Has the advantages that: this four-wire current sense resistor is through setting up the protective layer on the resistance board surface, and the protective layer main part and two protective layer flank parts of protective layer form cross wall and separate four electrode holding regions with the resistance board surface, and two current input electrodes and two voltage detection electrodes set up respectively in four electrode area territories to avoid etching the higher recess of required precision in resistance board both sides for separating the electrode, reduce four-wire current sense resistor's the manufacturing degree of difficulty, improve the product yield. Meanwhile, notches are arranged at two end parts of the resistance plate, the temperature coefficient of the resistance is adjusted by adjusting the depth of the notches, and the TCR of the resistance is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a four-wire current sensing resistor according to the present invention;
fig. 2 is an exploded view of the four-wire current sensing resistor of the present invention;
fig. 3 is a front view of the four-wire current sensing resistor of the present invention;
FIG. 4 is a left side view of FIG. 3;
FIG. 5 is a bottom view of FIG. 3;
fig. 6 is a schematic structural diagram of a resistance plate of the four-wire current sensing resistor of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 and fig. 2, the present embodiment discloses a four-wire current sensing resistor, which includes an insulating substrate 1, a resistor plate 2, a protective layer 3, two current input electrodes 4, and two voltage detection electrodes 5.
The insulating substrate 1 is made of a material having high mechanical strength and high hardness, such as 96% Al2O3A ceramic substrate or a glass fibre board. The resistance plate 2 is arranged on the surface of the insulating substrate 1, the resistance plate 2 is made of alloy materials to be a rectangular resistance plate 2, and the insulating glue with high thermal stability is adhered to the surface of the insulating substrate 1. As shown in fig. 6, the rectangular resistive plate 2 has a notch 21 penetrating in the thickness direction of the resistive plate at the middle of two short sides; the temperature coefficient of resistance is adjusted by adjusting the depth of the notch 21, and a product with TCR closer to 0 is obtained.
The protective layer 3 is made of FR4 epoxy resin and is attached to the surface of the resistor plate 2. As shown in fig. 3, the protective layer has a protective layer main body 31 extending from the notch 21 at the short side of one end of the resistive plate 2 to the notch 21 at the short side of the other end, and two protective layer flanks 32 extending from the protective layer main body 31 to the two long sides of the resistive plate 2. The two protective layer flanks 32 are symmetrical to each other, and the protective layer main body 31 and the two protective layer flanks 32 form a cross-shaped partition to divide the surface of the resistance plate 2 into four electrode accommodating areas. The two current input electrodes 4 are respectively arranged in two electrode accommodating areas at the same end of the resistance plate 2, and the two voltage detection electrodes 5 are respectively arranged in the other two electrode accommodating areas.
Specifically, the four separated electrode areas are all rectangular structures with the same width, and the length of the electrode accommodating area for accommodating the current input electrode 4 is longer than that of the electrode accommodating area for accommodating the voltage detection electrode 5. That is, the cross-shaped partition formed by the protection layer 3 partitions the surface of the resistance plate 2 into motor accommodating areas with different areas, wherein the area of the current input electrode 4 is larger than that of the voltage detection electrode 5. The temperature coefficient of resistance can be further adjusted by adjusting the separation position of the two protective layer flanks 32 at the long sides of the resistive plate 2, so that the TCR approaches 0 more. And the rated power of the product is in positive correlation with the current carrying capacity of the product, the larger the electrode is, the higher the current carrying capacity of the product is, so that the electrode with a large area is used as a current input electrode to be electrified, and the influence of four-terminal design on the reduction of the rated power is reduced.
The two ends of the protective layer main body 31 respectively extend downwards to form filling parts 33, and the two filling parts 33 are respectively filled in the two gaps 21, so that the electrodes on the two sides of the protective layer main body 31 are completely separated to avoid mutual interference.
As shown in fig. 4 and 5, the current input electrode 4 includes a copper layer 41 coated on the surface of the resistive plate 2, and a nickel-tin layer 42 barrel-coated on the surface of the copper layer 41. The voltage detection electrode 5 also has a copper layer 51 coated on the surface of the resistive plate 2 and a nickel-tin layer 52 barrel-coated on the surface of the copper layer 51. The copper layer has a thickness of 80-150 μm, and has good conductivity, so as to minimize the influence of electrode resistance on the measurement result. The nickel-tin layer is rolled on the surface of the copper layer to facilitate soldering tin.
Referring to FIG. 3 again, during the product measurement process, a current I with a known magnitude is applied to the two current input electrodes 4OTwo voltage detecting electrodes 5 are connected to a voltage detecting device for measuring a voltage VOThe resistance value of the product is measured according to ohm's law
Claims (8)
1. A four-wire current sensing resistor is characterized by comprising an insulating substrate (1), a resistor plate (2) arranged on the surface of the insulating substrate (1), a protective layer (3), two current input electrodes (4) and two voltage detection electrodes (5); the resistor plate (2) is a rectangular resistor plate, and the middle parts of two short sides of the rectangular resistor plate are provided with notches (21) which are penetrated in the thickness direction of the resistor plate (2); the protective layer (3) is attached to the surface of the resistor plate (2), the protective layer (3) is provided with a protective layer main body (31) extending from the notch (21) of the short side at one end of the resistor plate (2) to the notch (21) of the short side at the other end, and two protective layer side wings (32) extending from the protective layer main body (31) to the two long sides of the resistor plate (2) respectively, and the protective layer main body (31) and the two protective layer side wings (32) form a cross partition to separate four electrode accommodating areas from the surface of the resistor plate (2); the two current input electrodes (4) are respectively arranged in two electrode accommodating areas at the same end of the resistance plate (2), and the two voltage detection electrodes (5) are respectively arranged in the other two electrode accommodating areas.
2. The four-wire current sensing resistor according to claim 1, wherein the four electrode receiving areas are rectangular with uniform width, and the length of the electrode receiving area for receiving the current input electrode (4) is longer than the length of the electrode receiving area for receiving the voltage detection electrode (5).
3. The four-wire current sensing resistor according to claim 1, wherein two ends of the protection layer main body (31) respectively extend downwards to form filling portions (33), and the two filling portions (33) are respectively filled in the two gaps (21).
4. The four-wire current sensing resistor according to claim 1, wherein the current input electrode (4) and the voltage detection electrode (5) each have a copper layer hung on the surface of the resistor plate (2) and a nickel-tin layer barrel-plated on the surface of the copper layer.
5. The four-wire current sense resistor according to claim 4, wherein the copper layer has a thickness of 80-150 μm.
6. The four-wire current sense resistor of claim 1, wherein the insulating substrate is 96% Al2O3A ceramic substrate or a glass fibre board.
7. The four-wire current sensing resistor of claim 1, wherein the resistor plate is an alloy resistor plate.
8. The four-wire current sensing resistor according to claim 1, wherein said protective layer is FR4 epoxy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920212536.8U CN209927932U (en) | 2019-02-18 | 2019-02-18 | Four-wire current sensing resistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920212536.8U CN209927932U (en) | 2019-02-18 | 2019-02-18 | Four-wire current sensing resistor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209927932U true CN209927932U (en) | 2020-01-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920212536.8U Expired - Fee Related CN209927932U (en) | 2019-02-18 | 2019-02-18 | Four-wire current sensing resistor |
Country Status (1)
| Country | Link |
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| CN (1) | CN209927932U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109975614A (en) * | 2019-02-18 | 2019-07-05 | 南京隆特集成电路科技有限公司 | A kind of four-wire type current sensing resistor and its measurement method |
-
2019
- 2019-02-18 CN CN201920212536.8U patent/CN209927932U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109975614A (en) * | 2019-02-18 | 2019-07-05 | 南京隆特集成电路科技有限公司 | A kind of four-wire type current sensing resistor and its measurement method |
| CN109975614B (en) * | 2019-02-18 | 2021-02-23 | 南京隆特集成电路科技有限公司 | Four-wire current sensing resistor and measuring method thereof |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200110 Termination date: 20210218 |
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| CF01 | Termination of patent right due to non-payment of annual fee |