CN111223621A - Resistor with a resistor element - Google Patents
Resistor with a resistor element Download PDFInfo
- Publication number
- CN111223621A CN111223621A CN201811415170.0A CN201811415170A CN111223621A CN 111223621 A CN111223621 A CN 111223621A CN 201811415170 A CN201811415170 A CN 201811415170A CN 111223621 A CN111223621 A CN 111223621A
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- resistor
- shunt
- current path
- strip
- connection
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C10/00—Adjustable resistors
- H01C10/46—Arrangements of fixed resistors with intervening connectors, e.g. taps
Abstract
The invention provides a resistor which comprises a resistor strip and a plurality of shunt connection parts. The resistor strip has a first end and a second end, and the resistor strip provides a first current path extending along the resistor strip from the first end to the second end. The plurality of shunt connecting parts are electrically connected to different positions of the first current path, and each shunt connecting part is provided with a pin. The distance between the first end and the second end is smaller than the length of the first current path, and the resistor strips and the pins of the shunt connecting parts are not coplanar. The first end and the second end are used for electrically connecting a power supply, two of the plurality of shunt connection parts are selected, and shunt voltage is obtained from the selected two shunt connection parts.
Description
Technical Field
The present invention relates to a resistor, and more particularly, to a resistor having a plurality of pins, which can obtain different resistance values by selecting different pins.
Background
Since the specifications of different types of electronic devices may be different, engineers need to adjust the setting values of the detection equipment before testing the electronic devices. For example, the voltage signal output by the detection device needs to fall within a predetermined range, and the electronic device can correctly interpret the voltage signal. In practice, a voltage of a larger voltage from a voltage source is usually reduced by a voltage division method, so as to fine tune a suitable voltage signal. However, the conventional voltage division method is easily interfered by noise, and the voltage resolution is low, so that a proper voltage signal cannot be finely adjusted. In addition, the conventional voltage division method often uses a large area of resistors or complex electronic components, and the conventional voltage division method is also not suitable for use because of the smaller and smaller circuit size.
Therefore, there is a need in the industry for a new resistor that provides more voltage selectivity for engineers, has more opportunity to fine tune the appropriate voltage signal, and occupies less area.
Disclosure of Invention
The invention provides a resistor which provides a plurality of pins, and engineers can freely select two pins to obtain various resistance values, thereby finely adjusting a proper voltage signal. In addition, the resistor provided by the invention has a three-dimensional structure, so that the excessive area occupation can be avoided, and the reduction of the size of a circuit is facilitated.
The invention provides a resistor, which comprises a resistor strip and a plurality of shunt connection parts. The resistor strip has a first end and a second end, and the resistor strip provides a first current path extending along the resistor strip from the first end to the second end. Each shunt connection part is electrically connected to different positions of the first current path, and each shunt connection part is provided with a pin. The distance between the first end and the second end is smaller than the length of the first current path, and the resistor strip and the pin of each shunt connecting part are not coplanar. The first end and the second end are used for electrically connecting a power supply, two of the plurality of shunt connection parts are selected, and shunt voltage is obtained from the selected two shunt connection parts.
In one example, the selected two shunt connections form a second current path having a length less than the length of the first current path. In addition, the resistor further comprises a first power connection portion and a second power connection portion, the first power connection portion is connected to the first end, the second power connection portion is connected to the second end, and the power source is electrically connected to the first end and the second end through the first power connection portion and the second power connection portion respectively.
The invention provides a resistor, which comprises M arched structures and N shunt connecting parts. The M arch structures are sequentially arranged along a first direction and are defined with a first side and a second side, the M arch structures provide a first current path, and the 1 st arch structure and the Mth arch structure are used for being connected with a power supply. N reposition of redundant personnel connecting portion electric connection to M domes, and each reposition of redundant personnel connecting portion have a pin, M domes are not coplanar with the pin of each reposition of redundant personnel connecting portion. Two of the N shunt connection parts are selected, and shunt voltages are obtained from the two selected shunt connection parts. Wherein the mth arch structure is connected to the (M-1) th arch structure at the first side through the first conductive segment, and the mth arch structure is connected to the (M + 1) th arch structure at the second side through the second conductive segment, M, N is a natural number greater than 2, and M is a natural number greater than 1 and less than M.
In summary, the resistor provided by the invention has the conductive resistor strips which can be arranged in an arch structure, and various different electrical group values are provided by using the shunt connection parts connected to the resistor strips. Through connecting the pin of two of them reposition of redundant personnel connecting portion, the engineer can fine-tune out suitable reposition of redundant personnel voltage very easily.
Other effects and embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic perspective view of a resistor according to an embodiment of the invention;
FIG. 2 is a schematic diagram showing a top view of a resistor according to an embodiment of the invention;
FIG. 3 is a schematic perspective view of a resistor according to another embodiment of the invention;
FIG. 4 is a schematic diagram showing a top view of a resistor according to another embodiment of the invention;
FIG. 5 is a schematic diagram showing a side view of a resistor according to another embodiment of the invention.
Description of the symbols
1 resistor 10 resistor strip
10a first end 10b second end
100 a-100 h domes 102a, 102b conductive segments
104 first power connection 106 second power connection
12-shunt connection 120 pin
122 bending part 2 resistor
20 resistor strip 204 first power connection
206 second power connection 22 shunt connection
220 pin 222 bending part
24 Heat sink portion S1 first Current Path
S2 second Current Path S3 third Current Path
Detailed Description
The foregoing and other technical matters, features and effects of the present invention will be apparent from the following detailed description of a preferred embodiment, which is to be read in connection with the accompanying drawings. Directional terms as referred to in the following examples, for example: up, down, left, right, front or rear, etc., are simply directions with reference to the drawings. Accordingly, the directional terminology is used for purposes of illustration and is in no way limiting.
Referring to fig. 1 and 2 together, fig. 1 is a schematic perspective view illustrating a resistor according to an embodiment of the invention, and fig. 2 is a schematic top view illustrating the resistor according to the embodiment of the invention. As shown in the figure, the resistor 1 includes a resistor strip 10 and a plurality of shunt connection portions 12, the resistor strip 10 and the shunt connection portions 12 are made of conductive materials, and the shunt connection portions 12 are connected to different positions of the resistor strip 10. In practice, the resistor strips 10 and the shunt connections 12 may be integrally formed, for example, the resistor strips 10 and the shunt connections 12 are formed by stamping a same conductive plate, so that the resistor strips 10 and the shunt connections 12 can be bent into a suitable shape. Each shunt connection portion 12 may have a leg 120 and a bending portion 122, and the bending portion 122 shown in fig. 1 may be connected between the resistor strip 10 and the leg 120. In one example, the pins 120 of each shunt connection 12 can be aligned with a plane, so that an engineer can connect the pins 120 conveniently, such as wire bonding, drilling or soldering.
In addition, the resistor strip 10 and the pins 120 are not flush with each other in the same plane, so that the resistor strip 10 may have a three-dimensional structure, and the planar area occupied by the resistor strip 10 is saved. In addition, the resistor strip 10 may be bent into a plurality of arch structures, which are arranged from left to right in fig. 1, and may be regarded as a plurality of arch structures 100a to 100h connected to each other. The shapes and connection relationships of the resistor strips 10 and the shunt connection portions 12 will be described below.
For convenience of illustration, the resistor 1 is defined to have a first side and a second side, and the resistor 1 has a first current path S1 extending from the first end 10a to the second end 10b of the resistor strip 10. Taking the top view shown in fig. 2 as an example, the first side may be a side of the resistor 1 near the top of the drawing, and the second side may be a side of the resistor 1 near the bottom of the drawing. When the resistor strip 10 is viewed as a plurality of connected arches 100 a-100 h, the arches 100 a-100 h are connected by a first side conductive segment 102a and a second side conductive segment 102 b. In practice, to maximize the first current path S1, two adjacent arches are not connected by the first side conductive segment 102a and the second side conductive segment 102b simultaneously, and three adjacent arches are not connected by two conductive segments on the same side continuously. For example, if two conductive segments are connected between three adjacent domes successively on the same side, it is obvious that the current will only pass through the two conductive segments, which is equivalent to making a shortcut to the current, while the domes in the middle are configured as dummies and will reduce the length of the first current path S1.
For the example shown in fig. 2, the first dome 100a and the second dome 100b are connected by a first side conductive segment 102 a. The second dome 100b and the third dome 100c are connected by a second side conductive segment 102 b. In other words, when the resistor strip 10 is viewed in the top view shown in fig. 2, it can be seen that the shape of the resistor strip 10 may be an arcuate or W-shaped pattern, and the resistor strip is repeatedly bent from the first end 10a to the second end 10 b. Therefore, the first current path S1 can sequentially pass through the plurality of arches 100 a-100 h, and the plurality of arches 100 a-100 h can be regarded as a series-connected resistor line. Since the shape of the resistor strip 10 presents an arcuate or W-shaped appearance, the physical, apparent linear distance between the first end 10a and the second end 10b may be less than the length of the curved first current path S1. Furthermore, the invention is not limited to each arch necessarily having one or two shunt connections 12 attached thereto, and some arches may not have a shunt connection 12 attached thereto, or two arches may share a shunt connection 12. The shunt connection portion 12 may be connected to any position of the resistor strip 10, and in practice, for convenience of subsequent use by an engineer, the shunt connection portion 12 may be connected to the first side and the second side, respectively.
In one example, the resistive strip 10 and the shunt connection 12 are not necessarily clearly distinguished in structure, and thus the extent of the resistive strip 10 may be defined as the area through which the first current path S1 passes. From a physical point of view, when the plurality of shunt connections 12 remain open, the current path from the first end 10a to the second end 10b can only follow the resistor strip 10, and not pass through the shunt connections 12. When the resistor strip 10 is made of a uniform material, the first current path S1 is the shortest path from the first end 10a to the second end 10b, so that the first current path S1 can sequentially pass through the plurality of arches 100 a-100 h and the conductive segments in the resistor strip 10.
In one example, the first terminal 10a and the second terminal 10b may be electrically connected to an external power source, such as a power supply. In practice, the first end 10a of the resistor strip 10 may be connected to the first power connection 104, and the second end 10b of the resistor strip 10 may be connected to the second power connection 106, so that the current from the external power source may flow through the whole resistor strip 10 via the first power connection 104 and the second power connection 106. Here, the first power connection portion 104 and the second power connection portion 106 may have similar appearance shapes to the shunt connection portion 12, and the first power connection portion 104, the second power connection portion 106, the resistor strip 10 and the shunt connection portion 12 may also be formed by stamping the same conductive plate. It should be noted that although it is exemplified that the positive and negative terminals of the external power source are directly connected to the first power source connection portion 104 and the second power source connection portion 106, the present embodiment is not limited thereto, for example, the positive and negative terminals of the external power source may also be connected to the two shunt connection portions 12.
When the positive and negative terminals of the external power source are connected to the first power source connection part 104 and the second power source connection part 106, the resistive strip 10 may be regarded as a resistive structure of one, and the resistance value between the first power source connection part 104 and the second power source connection part 106 may be assumed as a 0. Generally, when the resistor strip 10 is made of a uniform material, the resistance value is proportional to the length of the current path, and since the plurality of shunt connection portions 12 are connected to the resistor strip 10 between the first end 10a and the second end 10b, in the case that the current flowing through the resistor strip 10 is stable, the voltage seen between any two shunt connection portions 12 is proportional to the length of the current path between any two shunt connection portions 12. In addition, since the current path between any two shunt connection portions 12 is smaller than the first current path S1, the shunt voltage output from any two shunt connection portions 12 is smaller than the voltage V provided by the external power source, thereby achieving the effect of dividing the voltage V of the external power source.
In a practical example, if one chooses to take the shunt voltage from the shunt connection 12b (connecting the first side of the second dome 100 b) and the shunt connection 12d (connecting the second side of the fourth dome 100 d), the shunt connection 12b to the shunt connection 12d has a second current path S2. Assuming that the resistance value between the shunt connection 12b and the shunt connection 12d is a1, the voltage division ratio is a1/a0, and it is assumed that the shunt voltage obtained from the shunt connection 12b and the shunt connection 12d is (a1/a0) V. In one example, the voltage division ratio may also be similar to the length ratio of the first current path S1 to the second current path S2. The present embodiment is not limited to the actual value of the resistance value a0, but only exemplifies the voltage division manner of the resistor 1, and a person skilled in the art can freely design the resistance value of the resistor strip 10 by adjusting the material, thickness or length of the resistor strip 10.
In one example, the resistor 1 may be subjected to a pre-test procedure before being shipped from a factory, where the pre-test procedure may be performed to measure the resistance between any two shunt connections, in addition to the resistance a 0. For example, the engineer may select one of the shunt connection portions 12 as the main measurement target, for example, select the shunt connection portion 12b, and then measure the resistance between the shunt connection portion 12b and each of the other shunt connection portions, so as to obtain the resistance of the shunt connection portion 12b to each of the other shunt connection portions. In other words, as long as all the shunt connection parts 12 are selected in order as the measurement targets, a resistance value table in which the resistance value between any two shunt connection parts can be recorded can be obtained. Accordingly, when designing how much of the divided voltage to be obtained, the engineer can try to calculate an appropriate voltage division ratio with reference to the voltage V of the external power supply, and can calculate an appropriate voltage division resistance value from the voltage division ratio and the resistance value a 0. Finally, the resistance value table is referred to find out which two shunt connection parts 12 should be connected to obtain the voltage division resistance value.
In addition, it should be understood by those skilled in the art that when current passes through the plurality of arch structures 100 a-100 h and the conductive segments in the resistor strip 10, the resistor strip 10 may convert part of the electrical energy into heat energy, and thus the resistor 1 may need to enhance the heat dissipation effect. Therefore, the invention further discloses an example that the resistor may have a heat dissipation portion, please refer to fig. 3 and fig. 4 together, fig. 3 is a schematic perspective view illustrating a resistor according to another embodiment of the invention, and fig. 4 is a schematic top view illustrating a resistor according to another embodiment of the invention. As shown, the resistor 2 also includes a resistor strip 20 and a plurality of shunt connections 22, as in the previous embodiment, the resistor strip 20 and the shunt connections 22 are also made of conductive material, and the shunt connections 22 can also be connected to different locations of the resistor strip 20.
Unlike the previous embodiment, the shapes of the resistor strip 20 and the shunt connection portion 22 can be adjusted, for example, the resistor strip 20 can be substantially located on the same plane, and only the shunt connection portion 22 has the bending portion 222. Unlike the resistor 1 of fig. 1 in which the resistor strips 10 are individually seen as a plurality of domes in appearance, the resistor 2 of fig. 3 needs to combine the resistor strips 20 and the shunt connection portions 22 to be seen as a plurality of domes. Since the height of the resistor strip 20 may be reduced closer to the pins 220, the resistor 2 may be flatter and may be suitable for circuits with less space in the height axis.
With reference to fig. 4, the resistor strip 20 may be connected to the first power connection 204 and the second power connection 206 at the head end and the tail end, respectively, so that a first current path S3 may be provided between the first power connection 204 and the second power connection 206. Different from the previous embodiment, a plurality of heat dissipation portions 24 may be designed on the resistor strip 20 of the present embodiment, and the heat dissipation portions 24 may also be disposed in the first power connection portion 204, the second power connection portion 206 and the shunt connection portion 22. In practice, the heat dissipation portion 24, the first power connection portion 204, the second power connection portion 206, the resistor strip 20 and the shunt connection portion 22 may also be formed by stamping the same conductive plate. The present embodiment does not limit the shape or size of the heat sink member 24, as long as the heat sink member 24 does not affect or shorten the first current path S3.
In practice, in order to improve the heat dissipation effect of the heat dissipation portion 24, the heat dissipation portion 24 may be bent into various shapes during pressing. Referring to fig. 5, fig. 5 is a schematic side view of a resistor according to another embodiment of the invention. As shown in fig. 5, the heat dissipation portions 24 are substantially located on the same plane, and the heat dissipation portions 24 and the pins 220 may not be coplanar, for example, the heat dissipation portions 24 may protrude from the resistor strips 20, and the pins 220 may be lower than the resistor strips 20, so that the resistor 2 may form a hollow structure, which facilitates air to take away heat.
In summary, the resistor provided by the invention has the conductive resistor strips which can be arranged in an arch structure, and by utilizing the shunt connection parts connected to the resistor strips, various different electrical component values are provided, and engineers can easily fine-tune the appropriate shunt voltage. In addition, the resistor can be provided with a heat dissipation part, so that the influence of overheating on the stability of the resistance value of the resistor can be avoided.
The above-described embodiments and/or implementations are only for illustrating the preferred embodiments and/or implementations of the present technology, and are not intended to limit the implementations of the present technology in any way, and those skilled in the art can make many modifications or changes without departing from the scope of the technology disclosed in the present disclosure, but should be construed as technology or implementations that are substantially the same as the present technology.
Claims (11)
1. A resistor, comprising:
the resistor strip is provided with a first end and a second end, the first end and the second end are used for being electrically connected with a power supply, the resistor strip provides a first current path, the first current path extends from the first end to the second end along the resistor strip, and the distance between the first end and the second end is less than the length of the first current path; and
the shunt connecting parts are electrically connected to different positions of the first current path, each shunt connecting part is provided with a pin, and the resistor strip and the pins of the shunt connecting parts are not coplanar;
two of the shunt connection parts are selected, and a shunt voltage is obtained from the two selected shunt connection parts.
2. The resistor of claim 1 further comprising a first power connection and a second power connection, the first power connection being connected to the first end, the second power connection being connected to the second end, the power being electrically connected to the first end and the second end through the first power connection and the second power connection, respectively.
3. The resistor of claim 1 wherein the two selected shunt connections form a second current path having a length less than a length of the first current path.
4. The resistor of claim 1 wherein each of the shunt connections further comprises a bend portion, the bend portion being connected between the resistor strip and the pin.
5. The resistor of claim 1 wherein the resistive track is integrally formed with the shunt connections.
6. The resistor of claim 1, wherein the resistor strip further comprises a plurality of heat dissipation portions extending from the resistor strip, the heat dissipation portions being substantially coplanar with the leads.
7. A resistor, comprising:
the M arched structures are sequentially arranged along a first direction and are defined with a first side and a second side, the M arched structures provide a first current path, and the 1 st arched structure and the M-th arched structure are used for being connected with a power supply; and
n shunt connection parts electrically connected to the M arch structures, each shunt connection part having a pin, the M arch structures and the pin of each shunt connection part not being coplanar, wherein two of the N shunt connection parts are selected, and a shunt voltage is obtained from the two selected shunt connection parts;
wherein the mth dome is connected to the M-1 st dome at the first side via a first conductive segment, and the mth dome is connected to the M +1 th dome at the second side via a second conductive segment, M, N is a natural number greater than 2, and M is a natural number greater than 1 and less than M.
8. The resistor of claim 7 wherein the two selected shunt connections form a second current path having a length less than the length of the first current path.
9. The resistor of claim 7 wherein each of the shunt connections further has a bend portion connected between one of the M arches and the pin.
10. The resistor of claim 7 wherein the M domes are integrally formed with the N shunt connections.
11. The resistor of claim 7 wherein each dome further comprises at least one heat sink portion extending from the dome.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811415170.0A CN111223621B (en) | 2018-11-26 | 2018-11-26 | Resistor with a resistor element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811415170.0A CN111223621B (en) | 2018-11-26 | 2018-11-26 | Resistor with a resistor element |
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| Publication Number | Publication Date |
|---|---|
| CN111223621A true CN111223621A (en) | 2020-06-02 |
| CN111223621B CN111223621B (en) | 2022-07-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811415170.0A Active CN111223621B (en) | 2018-11-26 | 2018-11-26 | Resistor with a resistor element |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4339743A (en) * | 1980-11-10 | 1982-07-13 | Tom Mcguane Industries | Multiple resistance element assembly and method of making same |
| JPS5952802A (en) * | 1982-09-20 | 1984-03-27 | 日本国有鉄道 | Electric resistance element |
| JPH0438602Y2 (en) * | 1985-12-20 | 1992-09-09 | ||
| JPH06120002A (en) * | 1993-04-19 | 1994-04-28 | Nishi Nippon Tetsudo Kk | Resistor for testing generator |
| CN1436403A (en) * | 2000-06-19 | 2003-08-13 | 先进微装置公司 | Programmable gain amplifier for use in data network |
| CN101281809A (en) * | 2008-05-26 | 2008-10-08 | 中国航天科技集团公司第五研究院第五一四研究所 | High value resistor, voltage divider based on the same |
| CN202159539U (en) * | 2011-06-14 | 2012-03-07 | 山西兴永明仪器仪表有限责任公司 | Resistor of printed circuit board (PCB) |
| CN204926942U (en) * | 2015-09-15 | 2015-12-30 | 陈海花 | Many resistances resistance box |
-
2018
- 2018-11-26 CN CN201811415170.0A patent/CN111223621B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4339743A (en) * | 1980-11-10 | 1982-07-13 | Tom Mcguane Industries | Multiple resistance element assembly and method of making same |
| JPS5952802A (en) * | 1982-09-20 | 1984-03-27 | 日本国有鉄道 | Electric resistance element |
| JPH0438602Y2 (en) * | 1985-12-20 | 1992-09-09 | ||
| JPH06120002A (en) * | 1993-04-19 | 1994-04-28 | Nishi Nippon Tetsudo Kk | Resistor for testing generator |
| CN1436403A (en) * | 2000-06-19 | 2003-08-13 | 先进微装置公司 | Programmable gain amplifier for use in data network |
| CN101281809A (en) * | 2008-05-26 | 2008-10-08 | 中国航天科技集团公司第五研究院第五一四研究所 | High value resistor, voltage divider based on the same |
| CN202159539U (en) * | 2011-06-14 | 2012-03-07 | 山西兴永明仪器仪表有限责任公司 | Resistor of printed circuit board (PCB) |
| CN204926942U (en) * | 2015-09-15 | 2015-12-30 | 陈海花 | Many resistances resistance box |
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| Publication number | Publication date |
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| CN111223621B (en) | 2022-07-19 |
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