CN202205525U - Precise current sensing component - Google Patents
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- CN202205525U CN202205525U CN2011203453611U CN201120345361U CN202205525U CN 202205525 U CN202205525 U CN 202205525U CN 2011203453611 U CN2011203453611 U CN 2011203453611U CN 201120345361 U CN201120345361 U CN 201120345361U CN 202205525 U CN202205525 U CN 202205525U
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Abstract
The utility model belongs to the field of a precise current sensing component and in particular relates to a multi-layer structure precise current sensing component with radiating layers. The multi-layer structure precise current sensing component comprises resistor bodies, radiating fins, electrodes, an insulation heat conducting rubber layer, communication holes and a protection layer. The precise current sensing component comprises at least one layer of resistor body and two layers of radiating fins, and an insulation slit is arranged between the radiating fins. The insulation heat conducting rubber layer is arranged between metal layers, the electrodes are arranged on two sides of a product, and the electrodes, the resistor bodies and the radiating fins all form connection. One communication hole is arranged on each electrode, and the communication holes, the resistor bodies and the radiating fins all form connection. The manufacture method is that a thick resistor body is disassembled into a plurality of thin resistor bodies, trimming is conducted on the thin resistor bodies first, and then alloy sheets are connected in parallel. Each resistor body is respectively provided with at least one radiating fin to facilitate radiation, a radiating characteristic of products is greatly improved, the layer of protection layer can be covered on the outer layer of the precise current sensing component, and the practicality is strong.
Description
Technical field
The utility model belongs to precision current sensing element field, is specifically related to a kind of structure that is used for the precision current sensing element of overcurrent protection.
Background technology
As everyone knows, the size of resistance is relevant with three factors, conductor resistance rate, the length of conductor and the cross-sectional area of conductor.Under the prerequisite that conductor material is fixed, the resistivity of conductor is just constant.Want the length of resistance change can increasing greatly conductor or the cross-sectional area of reduction conductor.Promote the withstanding current capability of conductor, reduction resistance is arranged, perhaps resistance is constant but the proportional increase of conductor length and cross-sectional area perhaps improves three modes of radiating effect,
Existing high power current sensing resistor is single electric resistance alloy sheet design mostly; Do not set up any heat dissipating layer; Reduce resistance; Alloy sheet will be thickeied, so the lifting of electrical property can only rely on length or two means of cross-sectional area that change resistance merely, and the space that therefore also has certain innovation and improve.
Therefore, 2010/0060409A1 is said like U.S. Pat, if increase the withstanding current capability of product; Then will reduce resistance, increase cross-sectional area, and electronic component is day by day to today of compact transformation; The cross-sectional area change greatly just means that thickness increases; And, brought high difficulty to production along with the increase of alloy sheet thickness, equipment has also been proposed high requirement.Efficient reduces, and yield descends, and cost sharply rises.
CN201117381Y is said like document, and resistive layer is to rely on mucigel attached on the ceramic substrate, and the gimmick of bring to power can only be through continuous stack single-layer products; Reduce resistance, and also be accompanied by the increase of potsherd the stack alloy sheet time, in this manner; Product thickness sharply increases, and the overlapping of the potsherd of different layers also is a very big problem, and the pressing of multi-layer ceramics; Cause potsherd to break more easily, reduce properties of product.Receive the influence of product thickness, product can't develop to miniaturization, in today of product miniaturization day by day, obviously also is unfavorable technology.
Summary of the invention
The purpose of the utility model provides a kind of precision current sensing element structure and manufacturing approach, no matter this method is very outstanding at resistance precision, properties of product, product yield and manufacturing approach simplification everyway, meets the industrialization demand.
The described precision current sensing element of the utility model comprises resistive element, termination electrode and protective layer, and this precision current sensing element is outer to be that each one deck fin up and down, fin are provided with at least one slit that insulate; Have layer protective layer at least, be located on fin or the following fin; Between upper and lower fin, be provided with one deck resistive element at least; Between resistive element and fin, be connected through the insulating heat-conductive glue-line between the adjacent resistor body, two electrodes about said this precision current sensing element is provided with, each electrode is provided with welding electrode, termination electrode and following welding electrode; Termination electrode all forms with fin and resistive element and is electrically connected; On the said element, be provided with at least two vias, all form with fin and resistive element and be electrically connected in the both sides of fin insulation slit.
In the such scheme, between the said upper and lower fin, can also be that resistive element is arranged alternately with internal set heat radiation fin and is connected through the insulating heat-conductive glue-line, internal set heat radiation fin be the same with outer field fin, is provided with at least one insulation slit and same via.
The composite multi-layer structure of the described element of the utility model can be to form through the pressing of insulating heat-conductive glue with each individual layer (comprising fin and resistive element) of handling well carrying out figure; Also can be to carry out the internal layer unit earlier, more one or more internal layers unit formed through the pressing of insulating heat-conductive glue with outer.
When not having internal set heat radiation fin in the element, can adopt following step preparation:
(a) the preparation internal layer is bonding two electric resistance alloys and an insulating heat-conductive glue-line lamination, forms sandwich structure, and the centre is the insulating heat-conductive glue-line; Through etching or radium-shine mode, on electric resistance alloy, form the resistive element figure of array again;
(b) repairing resistance, is on the resistive element of accomplishing figure, to repair resistance, makes the resistance of resistive element reach the target resistance;
(c) preparation composite multi-layer plate, the fin figure of formation array on heat-conducting metal; Described composite multi-layer plate is earlier by at least one internal layer; It is bonding that two-layer heat-conducting metal and insulating heat-conductive glue carry out lamination, is positioned at the upper and lower surfaces of element during two-layer heat-conducting metal lamination, forms upper and lower fin; Slot and hole through the mode of machining; Mode through chemical plating, plating or physical vapour deposition (PVD) metallizes at cross-notching and boring position again, and so far, the visible part of accomplishing article all is metallized;
(d) outer-layer circuit moulding is to adopt etching or radium-shine mode to form the insulation slit of fin and the cut-off rule of precision current sensing element array meeting multiple-plate two sides;
(e) protective layer covers, and is at least one face formation protective layer at the precision current sensing element;
(f) forming electrode, is that the precision current sensing element substrate with the array that covers protective layer carries out surface treatment, forms one deck nickel dam earlier in the metal surface of exposing, and forms welding electrode again.
(g) cutting apart moulding, is that the precision current sensing element substrate with array is cut into single precision current sensing element.
When in the element internal set heat radiation fin being arranged, can adopt following step preparation:
(a) the preparation internal layer is an electric resistance alloy, and a heat-conducting metal and an insulating heat-conductive glue lamination are bonding, forms sandwich structure, and the centre is the insulating heat-conductive glue-line; Through etching or radium-shine mode, on electric resistance alloy, form the figure of the resistive element of array again, on heat-conducting metal, form the fin figure of array;
(b) repairing resistance, is on the resistive element of accomplishing figure, to repair resistance, makes the resistance of resistive element reach the target resistance;
(c) preparation composite multi-layer plate, described composite multi-layer plate carry out the lamination pressing by one or more internal layer and mucigels of repairing the resistance completion earlier, and the superiors and orlop are fin during lamination; Slot and hole through the mode of machining, the mode through chemical plating, plating or physical vapour deposition (PVD) metallizes at cross-notching and boring position again, and so far, the visible part of accomplishing article all is metallized;
(d) outer-layer circuit moulding is to adopt etching or radium-shine mode to form the insulation slit of fin and the cut-off rule of precision current sensing element array meeting multiple-plate two sides;
(e) protective layer covers, and is at least one face formation protective layer at the precision current sensing element;
(f) forming electrode, is that the precision current sensing element substrate with the array that covers protective layer carries out surface treatment, forms one deck nickel dam earlier in the metal surface of exposing, and forms welding electrode again;
(g) cutting apart moulding, is that the precision current sensing element substrate with array is cut into single precision current sensing element.
Generally speaking; The manufacturing approach of a kind of precision current sensing element that the utility model provides; Comprise the following step: carry out pressing preforming to an a sheet of heat-conducting metal and a sheet electric resistance alloy earlier through insulating heat-conductive glue earlier; On sheet heat-conducting metal and pellet resistance alloy, adopt etching or radium-shine mode to form figure then; On the sheet heat-conducting metal, form the insulation slit and the radiation fin array dividing mark line of array, on the pellet resistance alloy, form the resistance pattern and the resistive element array dividing mark line of array, the shape of resistance pattern is by the size decision of resistance value; The resistance value that the etching of resistive element figure is come out has a specific margin of tolerance, needs to adopt the radium-shine resistance of repairing, and rises to resistance in the target range, reaches the requirement of resistance value high accurancy and precision; Carry out the lamination pressing to the internal layer that completes with insulating heat-conductive glue more then; After accomplishing, pressing adopt mechanical system to slot and hole; Metallize through the mode cross-notching of chemical plating or physical vapour deposition (PVD) and the position of boring then; Metallization in that this stage accomplishes need be thickeied through plating mode, reaches high performance requirement; Through metallized sheet material; All visible parts all are metallized, and outer-layer circuit needs moulding once more, form insulation slit and radiation fin array dividing mark line; Selecting a face to carry out protective layer then covers; Form nickel electrode and welding electrode through electroplating again, and then cut, form single precision current sensing element.
The advantage of the utility model is:
1. this technology utilization existing processes is technological; Adopt the technology of at least two resistive layer parallel connections, the resistance value adjustment realizes that technology is simple, does not need extra increase equipment and relevant the input; Can reach and reduce product resistance, promote the purpose of product withstanding current capability.
2. this technology utilization existing processes technology adopts unique via design technology, has dropped at resistance alloys under the situation of the limit to realize changes in resistance through the distance of regulating through hole
3. be provided with insulating heat-conductive glue between this structure sheaf, the heat of every alloy sheet all can be transmitted on the fin fast.
4. no matter the bottom electrode resistance value of this structure size can realize the large tracts of land heat radiation, make the heat of the resistance substrate that can lead rapidly, promote properties of product.
5. this structural change is flexible, can realize the size diversification.
6. this structural manufacturing process is simple, and stock utilization is high, and cost reduces.
Description of drawings
Fig. 1, Fig. 2 are existing current sensing element sketch map.
Fig. 3 and Fig. 4 are the precision current sensing element sectional axonometric drawing of the utility model.
Fig. 5 is the profile of the precision current sensing element of the utility model at Fig. 4 (A-A).
Fig. 6 is the profile of the precision current sensing element of the utility model at Fig. 4 (B-B).
Fig. 7 ~ Figure 15 is the embodiment sketch map of the utility model.
The drawing reference numeral explanation
The last fin of C1
C2 the 1st resistive element
C3 the 2nd resistive element
Fin under the C4
C5 insulating heat-conductive glue-line
The last welding electrode of C6
The C7 via
The C8 termination electrode
The C9 slit that insulate
The C10 protective layer
C11 via metal layer
C12 end plane metal layer
The C13 nickel electrode
Welding electrode under the C14
C15 precision current sensing element
The L1 radiation fin array is cut apart at interval
L2 repaiies the resistance vestige
The L3 separation trough
L4 virtual dividing line
L5 resistive layer array is cut apart at interval
The L6 electric resistance alloy
The L7 heat-conducting metal.
Embodiment
Adopt embodiment that the precision current sensing element of the utility model is described below
.
Fig. 3 shows the precision current sensing element stereogram of the utility model; Fig. 5, Fig. 6 show the section of the precision current sensing element of the utility model; The precision current sensing element of the utility model is at least by last fin C1, following fin C4, the 1st resistive element C2, the 2nd resistive element C3
Insulating heat-conductive glueC5, upper/lower electrode C6, C14, via C7, termination electrode C8; Insulation slit C9, protective layer C10 constitutes.
Embodiment one:
The preparation internal layer is the electric resistance alloy L6 that is respectively equipped with a sheet insulating heat-conductive glue both sides, and as shown in Figure 7, present embodiment makes L6 and insulating heat-conductive glue C5 combine closely through pressing.Electric resistance alloy can be the very little material of temperature coefficient of resistance, and resistivity is not limit; Insulating heat-conductive glue can adopt the single fine thermal endurance that has, insulating properties, and thermal conductivity, the high molecular polymer glue class of tackness, that can pass through also that glass fiber strengthens has fine thermal endurance, insulating properties, thermal conductivity, a high molecular polymer glue class of tackness.The enterprising row line of accomplishing in pressing then of internal layer is made, and promptly electric resistance alloy L6 goes up and forms the 1st resistive element C2 with given shape, the 2nd resistive element C3 and resistive layer array as shown in Figure 9 and cut apart L5 at interval.Wherein the shape of resistive element C2, C3 is by the decision of resistance value size.And the figure of resistive element C2, C3 is overlooked coincidence under the state.
Repairing resistance is on the 1st resistive element C2 on the internal layer of preparation, the 2nd resistive element C3, to carry out the resistance finishing through machinery or radium-shine mode, and the part that is lower than target resistance will be repaiied in the target Standard resistance range.Stay and repair resistance vestige L2 shown in figure 10.The vestige of repairing resistance can be a straight line, L type etc.
Preparation composite multi-layer plate is to carry out the lamination pressing at least one internal layer, two heat-conducting metals and several insulating heat-conductive glue of repairing the resistance completion earlier, and heat-conducting metal can be conductive coefficient >=200W/mK metal material; Insulating heat-conductive glue is to adopt the single fine thermal endurance that has, insulating properties, and thermal conductivity, the high molecular polymer glue class of tackness, that can pass through also that glass fiber strengthens has fine thermal endurance, insulating properties, thermal conductivity, a high molecular polymer glue class of tackness.The structure levels of lamination is a heat-conducting metal, and heat-conducting metal is through insulating heat-conductive glue and internal layer bonding, and internal layer and internal layer also are through the insulating heat-conductive glue bond.Again through mechanical system fluting, boring.Form separation trough L3 shown in figure 12, via C7.Again the position metallization of fluting and boring; Metallized mode can be that the mode of chemical plating and physical vapour deposition (PVD) makes the section of fluting and boring cover the very thin metal conducting layer of one deck earlier; Thicken through the mode of electroplating again, make final products can bear the impact of big electric current.Metallization position end plane metal layer shown in figure 13 C12, and via metal layer C11 as shown in Figure 5.
The outer-layer circuit moulding is to adopt the mode of chemical etching to form outer fin figure, promptly forms radiation fin array shown in figure 13 and cuts apart L1 and insulation slit C9 at interval.And new that accomplish and go up fin C1, the figure of fin C4 and the 1st resistive element C2, the 1st resistive element C3 overlaps overlooking under the state down.
On new fin C1 that accomplishes or C4, form layer protective layer C10 shown in figure 14, can effectively prevent the short circuit of electrode, guarantee that short circuit does not appear in product when operate as normal.This protective layer adopts has fine thermal endurance, insulating properties, and thermal conductivity, adhesive high molecular polymer glue class can well help when preventing short circuit in the heat of the product guiding air.
Form electrode and be at the exposed metal/bare metal position of accomplishing the composite multi-layer plate of protective layer and form one deck nickel dam earlier through electroplating, C13 as shown in Figure 5 forms and goes up welding electrode C6, following welding electrode C14, and termination electrode C8.
After electrode formed, the utility model need be cut apart the composite base plate that forms electrode, and virtual dividing line L4 shown in figure 15 can adopt machinery or radium-shine mode to be divided into single precision current sensing element to the composite base plate of array.
Embodiment two:
The preparation internal layer is to be respectively equipped with the electric resistance alloy L6 of a sheet and the heat-conducting metal L7 of a sheet insulating heat-conductive glue both sides, and as shown in Figure 8, present embodiment makes electric resistance alloy L6, heat-conducting metal L7 and insulating heat-conductive glue C5 combine closely through pressing.Electric resistance alloy can be the very little material of temperature coefficient of resistance, and resistivity is not limit; Heat-conducting metal is to adopt the metal material of conductive coefficient more than or equal to 200W/mK; Insulating heat-conductive glue can adopt the single fine thermal endurance that has, insulating properties, and thermal conductivity, the high molecular polymer glue class of tackness, that can pass through also that glass fiber strengthens has fine thermal endurance, insulating properties, thermal conductivity, a high molecular polymer glue class of tackness.The enterprising row line of accomplishing in pressing then of internal layer is made, and promptly on electric resistance alloy L6, forms resistive element C2 with given shape as shown in Figure 8 and resistive layer array and cuts apart L5 at interval.Wherein the shape of resistive element C2 is by the decision of resistance value size.On heat-conducting metal L7, form fin shown in figure 11, this fin has at least one insulation slit C9 and radiation fin array is cut apart L1 at interval.And the figure of resistive element C2 and fin overlaps overlooking under the state.
Repair resistance and be enterprising machinery or the radium-shine mode of working of resistive element C2 on the internal layer of preparation and carry out resistance finishing, the part that is lower than target resistance will be repaiied in the target Standard resistance range.Stay and repair resistance vestige L2 shown in figure 10.The vestige of repairing resistance can be a straight line, L type etc.
Preparation composite multi-layer plate is repairing at least one internal layer that resistance accomplishes, carry out the lamination pressing earlier with several insulating heat-conductive glue, insulating heat-conductive glue be employing single have fine thermal endurance, an insulating properties; Thermal conductivity; The high molecular polymer glue class of tackness, that can pass through also that glass fiber strengthens has fine thermal endurance, an insulating properties; Thermal conductivity, the high molecular polymer glue class of tackness.The structure levels of lamination is a heat-conducting metal, and internal layer and internal layer also are through the insulating heat-conductive glue bond.Again through mechanical system fluting, boring.Form separation trough L3 shown in figure 12, via C7.Again the position metallization of fluting and boring; Metallized mode can be that the mode of chemical plating and physical vapour deposition (PVD) makes the section of fluting and boring cover the very thin metal conducting layer of one deck earlier; Thicken through the mode of electroplating again, make final products can bear the impact of big electric current.Metallization position end plane metal layer shown in figure 13 C12, and via metal layer C11 as shown in Figure 5.
The outer-layer circuit moulding is to adopt the mode of chemical etching to form outer fin figure, promptly forms radiation fin array shown in figure 13 and cuts apart L1 and insulation slit C9 at interval.And new that accomplish and go up fin C1, the figure of fin C4 and the 1st resistive element C2, the 1st resistive element C3 overlaps overlooking under the state down.
On fin C1 in the new completion or following fin C4, form layer protective layer C10 shown in figure 14, can effectively prevent the short circuit of electrode, guarantee that short circuit does not appear in product when operate as normal.This protective layer adopts has fine thermal endurance, insulating properties, and thermal conductivity, adhesive high molecular polymer glue class can well help when preventing short circuit in the heat of the product guiding air.
Form electrode and be at the exposed metal/bare metal position of accomplishing the composite multi-layer plate of protective layer and form one deck nickel dam earlier through electroplating, C13 as shown in Figure 5 forms and goes up welding electrode C6, following welding electrode C14, and termination electrode C8.
After electrode formed, the utility model need be cut apart the composite base plate that forms electrode, and virtual dividing line L4 shown in figure 14 can adopt machinery or radium-shine mode to be divided into single precision current sensing element to the composite base plate of array.
Embodiment three
If electric resistance alloy and heat-conducting metal itself have good rigidity, then can be undertaken by following manufacturing approach:
Earlier on electric resistance alloy, form resistive element, on heat-conducting metal, form fin with etched mode.
Pile up pressing to resistive element that completes and fin according to mode as shown in Figure 3 then, again through mechanical system fluting, boring.The position metallization of fluting and boring; Metallized mode can be that the mode of chemical plating and physical vapour deposition (PVD) makes the section of fluting and boring cover the very thin metal conducting layer of one deck earlier; Thicken through the mode of electroplating again, make final products can bear the impact of big electric current.
The outer-layer circuit moulding is to adopt the mode of chemical etching to form outer fin figure equally, and fin figure and resistive element figure overlap overlooking under the state.
On fin in the new completion or following fin, form layer protective layer, can effectively prevent the short circuit of electrode, guarantee that short circuit does not appear in product when operate as normal.This protective layer adopts has fine thermal endurance, insulating properties, and thermal conductivity, adhesive high molecular polymer glue class can well help when preventing short circuit in the heat of the product guiding air.
Form electrode and be at the exposed metal/bare metal position of accomplishing the composite multi-layer plate of protective layer and form one deck nickel dam earlier, form again and go up welding electrode, following welding electrode and termination electrode through electroplating.
After electrode formed, the utility model need be cut apart the composite base plate that forms electrode, and virtual dividing line L4 shown in figure 14 can adopt machinery or radium-shine mode to be divided into single precision current sensing element to the composite base plate of array
Comparative Examples one
With the element of embodiment one and two preparations identical with resistance value but the different existing element comparison of structure, result such as table 1:
Can find out obviously that from table 1 the 10m Ω product of accomplishing according to the utility model is littler by 0.1% ~ 0.2% than the resistance change of alloy sheet product front and back after the test of overload is in short-term accomplished of individual layer in the past.
The utility model is technical current sensing element; Concrete and creationary progressing greatly arranged really, then apply for utility model patent in accordance with the law, however above-mentioned description; The preferable embodiment that only contains the utility model; All any variations of deriving according to the utility model design spirit all should fall into the claim of the utility model, indicate hereby.
Claims (6)
1. a precision current sensing element comprises resistive element, termination electrode and protective layer, it is characterized in that:
This precision current sensing element is outer to be that each one deck fin up and down, fin are provided with at least one slit that insulate; Have layer protective layer at least, be located on fin or the following fin; Between upper and lower fin, be provided with one deck resistive element at least; Between resistive element and fin, be connected through the insulating heat-conductive glue-line between the adjacent resistor body, two electrodes about said this precision current sensing element is provided with, each electrode is provided with welding electrode (C6), termination electrode (C8) and following welding electrode (C14); Termination electrode (C8) all forms with fin and resistive element and is electrically connected; On the said element, be provided with at least two vias, all form with fin and resistive element and be electrically connected in the both sides of fin insulation slit.
2. precision current sensing element according to claim 1 is characterized in that, between the said upper and lower fin, resistive element is arranged alternately with internal set heat radiation fin and is connected through the insulating heat-conductive glue-line, and internal set heat radiation fin is provided with at least one insulation slit.
3. precision current sensing element according to claim 1 is characterized in that, described insulating heat-conductive glue is by adopting the insulating properties, thermal conductivity and the stable on heating macromolecular material that are strengthened by glass fiber to process.
4. precision current sensing element according to claim 1 is characterized in that, described resistive element be two-layer or two-layer more than.
5. precision current sensing element according to claim 1 is characterized in that described fin is processed more than or equal to the metal of 200W/mK by conductive coefficient.
6. precision current sensing element according to claim 1 is characterized in that, has at least two vias on the precision current sensing element; The material of via is a metal material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203453611U CN202205525U (en) | 2011-09-15 | 2011-09-15 | Precise current sensing component |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203453611U CN202205525U (en) | 2011-09-15 | 2011-09-15 | Precise current sensing component |
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| CN202205525U true CN202205525U (en) | 2012-04-25 |
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| CN2011203453611U Expired - Fee Related CN202205525U (en) | 2011-09-15 | 2011-09-15 | Precise current sensing component |
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| CN (1) | CN202205525U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354590A (en) * | 2011-09-15 | 2012-02-15 | 南京萨特科技发展有限公司 | Precision current sensing element and manufacturing method thereof |
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2011
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354590A (en) * | 2011-09-15 | 2012-02-15 | 南京萨特科技发展有限公司 | Precision current sensing element and manufacturing method thereof |
| CN102354590B (en) * | 2011-09-15 | 2013-03-27 | 南京萨特科技发展有限公司 | Precision current sensing element and manufacturing method thereof |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120425 Termination date: 20200915 |
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| CF01 | Termination of patent right due to non-payment of annual fee |