CN108565082A - Microhm current sense resistor - Google Patents
Microhm current sense resistor Download PDFInfo
- Publication number
- CN108565082A CN108565082A CN201810340387.3A CN201810340387A CN108565082A CN 108565082 A CN108565082 A CN 108565082A CN 201810340387 A CN201810340387 A CN 201810340387A CN 108565082 A CN108565082 A CN 108565082A
- Authority
- CN
- China
- Prior art keywords
- pair
- microhm
- galvanic electrode
- measurement electrodes
- voltage measurement
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C1/00—Details
- H01C1/14—Terminals or tapping points or electrodes specially adapted for resistors; Arrangements of terminals or tapping points or electrodes on resistors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C3/00—Non-adjustable metal resistors made of wire or ribbon, e.g. coiled, woven or formed as grids
Abstract
The present invention provides a kind of microhm current sense resistors, are applied to printed wiring board PCB, are related to current detection technology field, which includes resistor main body, a pair of of galvanic electrode and a pair of of voltage measurement electrodes；A pair of of galvanic electrode is arranged at the both ends of resistor main body, for connecting with current loop to be measured；A pair of of voltage measurement electrodes setting is at resistor main body both ends and between a pair of of galvanic electrode, for being connect with voltage detecting circuit；Galvanic electrode is electrically isolated with voltage measurement electrodes.Since galvanic electrode and voltage measurement electrodes are electrically isolated, which eliminates the influence of conductor resistance, contact resistance to resistance value precision using four line Kelvin's connection type of standard, in this way connection；Direction is connected by the current direction or voltage of transformation measuring circuit that switch current loop to be measured, influence of the material thermoelectrical potential to current detection accuracy is all can inhibit, to improve the accuracy of current detecting result.
Description
Technical field
The present invention relates to current detection technology fields, more particularly, to a kind of microhm current sense resistor.
Background technology
Microhm current sense resistor is also known as sampling resistor, sample resistance, current sensing resistor, current sensor.It is micro-
The series connection of ohms current detection resistance is used to electric current be converted to voltage signal and measures in circuit.
It is used in the microhm current sense resistor of PCB (Printed Circuit Board, printed wiring board) patch,
Referred to herein as PCB surface mounts microhm current sense resistor.The microhm current sense resistor of PCB surface attachment at present is all adopted
Quadrupole connection type, i.e. the electric current foot of PCB surface attachment microhm current sense resistor are simulated with two pole connection types or two poles
It is completely coupled to one another with voltage detecting foot.For PCB surface attachment microhm current sense resistor, except electricity
Other than the accuracy of manufacture for hindering ontology, conductor resistance caused by conducting wire connection and welding contact resistance can cause the inclined of actual resistance
Difference, for the resistor main body of resistance relatively low (microhm), the resistance value variations are big to can not ignore, to affect electric current
The accuracy of testing result；In addition, the thermoelectrical potential of two kinds of storerooms of resistor main body and electrode can vary with temperature, electric current can be also given
Detection brings the interference varied with temperature.
In summary, existing microhm current sense resistor can be caused by conductor resistance, contact resistance, temperature change etc.
Resistance value deviates, to keep current detecting not accurate enough.
Invention content
In view of this, the purpose of the present invention is to provide a kind of microhm current sense resistor, to reduce conductor resistance, connect
Electric shock resistance, influence of the temperature change to current detecting result, improve the accuracy of current detecting result.
In a first aspect, an embodiment of the present invention provides a kind of microhm current sense resistor, it is applied to printed wiring board
PCB, the microhm current sense resistor include resistor main body, a pair of of galvanic electrode and a pair of of voltage measurement electrodes；
A pair of galvanic electrode is separately positioned on the both ends of the resistor main body, is used for and current loop string to be measured
Connection；A pair of voltage measurement electrodes are separately positioned on the resistor main body both ends and between a pair of galvanic electrodes,
For being connect with voltage detecting circuit；
The galvanic electrode is electrically isolated with the voltage measurement electrodes.
With reference to first aspect, an embodiment of the present invention provides the first possible embodiments of first aspect, wherein institute
It is plate to state resistor main body, and the galvanic electrode and the voltage measurement electrodes are strip；A pair of voltage measurement electrodes
It is arranged in a manner of being mutually parallel between the galvanic electrode that a pair is mutually parallel.
The possible embodiment of with reference to first aspect the first, an embodiment of the present invention provides second of first aspect
Possible embodiment, wherein the resistor main body setting is fluted；A pair of galvanic electrode is separately positioned on the groove
On the boss of both sides, a pair of voltage measurement electrodes are separately positioned on the both ends of the groove.
With reference to first aspect, an embodiment of the present invention provides the third possible embodiments of first aspect, wherein institute
The material for stating resistor main body is alloy.
The third possible embodiment with reference to first aspect, an embodiment of the present invention provides the 4th kind of first aspect
Possible embodiment, wherein the alloy includes at least two elements in Cu, Ni, Cr, Mn, Si, Sn, Al.
With reference to first aspect, an embodiment of the present invention provides the 5th kind of possible embodiments of first aspect, wherein institute
The material for stating galvanic electrode and the voltage measurement electrodes is metal.
The 5th kind of possible embodiment with reference to first aspect, an embodiment of the present invention provides the 6th kind of first aspect
Possible embodiment, wherein the material of the galvanic electrode and the voltage measurement electrodes is Cu.
With reference to first aspect, an embodiment of the present invention provides the 7th kind of possible embodiments of first aspect, wherein institute
Galvanic electrode and the voltage measurement electrodes are stated to be combined with the resistor main body by high temperature hot pressing.
The embodiment of the present invention brings following advantageous effect：
In the embodiment of the present invention, the microhm current sense resistor applied to printed wiring board PCB includes resistor main body, one
To galvanic electrode and a pair of of voltage measurement electrodes；A pair of of galvanic electrode is separately positioned on the both ends of resistor main body, for wait for
Measure current loop series connection；A pair of of voltage measurement electrodes be separately positioned on resistor main body both ends and positioned at a pair of of galvanic electrode it
Between, for being connect with voltage detecting circuit；Galvanic electrode is electrically isolated with voltage measurement electrodes.Due to galvanic electrode and voltage measurement
Electrode is electrically isolated, and galvanic electrode is connected with current loop to be measured, and voltage measurement electrodes are connect with voltage detecting circuit, therefore should
Microhm current sense resistor eliminates conductor resistance, contact using four line Kelvin's connection type of standard, in this way connection
Influence of the resistance to resistance value precision；Additionally by the current direction or voltage of transformation measuring circuit for switching current loop to be measured
Direction is connected, influence of the material thermoelectrical potential to current detection accuracy is all can inhibit, to improve the accurate of current detecting result
Degree.
Other features and advantages of the present invention will illustrate in the following description, also, partly become from specification
It obtains it is clear that understand through the implementation of the invention.The purpose of the present invention and other advantages are in specification and attached drawing
Specifically noted structure is realized and is obtained.
To enable the above objects, features and advantages of the present invention to be clearer and more comprehensible, preferred embodiment cited below particularly, and coordinate
Appended attached drawing, is described in detail below.
Description of the drawings
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, in being described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, other drawings may also be obtained based on these drawings.
Fig. 1 is a kind of stereogram of microhm current sense resistor provided in an embodiment of the present invention；
Fig. 2 is the projection view in the directions A in Fig. 1；
Fig. 3 is a kind of schematic diagram of microhm current sense resistor provided in an embodiment of the present invention.
Icon：
101- resistor main bodies；102- galvanic electrodes；103- voltage measurement electrodes.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with attached drawing to the present invention
Technical solution be clearly and completely described, it is clear that described embodiments are some of the embodiments of the present invention, rather than
Whole embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Lower obtained every other embodiment, shall fall within the protection scope of the present invention.
Current existing microhm current sense resistor can caused by conductor resistance, contact resistance, temperature change etc. resistance
Value offset, to keep current detecting not accurate enough.Based on this, a kind of microhm current detecting electricity provided in an embodiment of the present invention
Resistance can reduce the influence of conductor resistance, contact resistance, temperature change to current detecting result, improve current detecting result
Accuracy.
For ease of understanding the present embodiment, below to a kind of microhm current detecting disclosed in the embodiment of the present invention
Resistance describes in detail.
An embodiment of the present invention provides a kind of microhm current sense resistors, and the microhm current sense resistor is exclusively for print
Wiring board PCB patches processed are used and are designed.
Fig. 1 is a kind of stereogram of microhm current sense resistor provided in an embodiment of the present invention, and Fig. 2 is the directions A in Fig. 1
Projection view.As depicted in figs. 1 and 2, which includes resistor main body 101, a pair of of galvanic electrode 102
And a pair of voltage measurement electrodes 103；A pair of of galvanic electrode 102 is separately positioned on the both ends of resistor main body 101, for it is to be measured
Measure current loop series connection；A pair of of voltage measurement electrodes 103 are separately positioned on 101 both ends of resistor main body and positioned at a pair of of galvanic electrodes
Between 102, for being connect with voltage detecting circuit；Galvanic electrode 102 is electrically isolated with voltage measurement electrodes 103.
Since galvanic electrode 102 and voltage measurement electrodes 103 are electrically isolated, what which used
It is four line Kelvin's connection type of standard, galvanic electrode 102 is connected with current loop to be measured, voltage measurement electrodes 103 and electricity
Detection circuit connection is pressed, eliminates the influence of conductor resistance, contact resistance to resistance value precision, i.e., using the galvanic electrode of separation
102 and voltage measurement electrodes 103, it can more accurately be measured compared to traditional two terminals sensing.Additionally by switching
The current direction or voltage of transformation measuring circuit of current loop to be measured connect direction, all can inhibit material thermoelectrical potential and are examined to electric current
The influence for surveying precision, to meet high-precision current testing requirements, to improve the accuracy of current detecting result.In addition, electric
Press measuring electrode 103 be arranged between galvanic electrode 102, make voltage measurement electrodes 103 be included in 102 circuit of galvanic electrode it
It is interior, there is a small amount of potential difference between galvanic electrode 102 and voltage measurement electrodes 103, accurately sampling electricity can be obtained in this way
Pressure, the input impedance of sample circuit is very high, can be ignored to the shunting function of electric current so that current detecting result is more accurate
Really.
Fig. 3 be a kind of schematic diagram of microhm current sense resistor provided in an embodiment of the present invention, as shown in figure 3, when into
When row current detecting, microhm current sense resistor can be accessed into current loop to be measured with couple of conductor A1, A2, use is another
Voltage detecting circuit is introduced by the voltage value on microhm current sense resistor to conducting wire B1, B2, wherein microhm current detecting
The resistance value of resistance is denoted as R, and the electric current to be measured of current loop to be measured is denoted as I, and the voltage value of voltage detecting circuit detection is denoted as
U.Since current loop to be measured and voltage detecting circuit are that independently, the internal driving of voltage detecting circuit is very high,
The electric current for flowing through voltage detecting circuit is very small, therefore conductor resistance, contact resistance are all negligible in voltage detecting circuit, therefore electricity
Pressure detection circuit can accurately measure the voltage value U on microhm current sense resistor R, and standard is obtained using calculating (I=U/R)
True current value.
Specifically, the material of resistor main body 101 is alloy, and the material of galvanic electrode 102 and voltage measurement electrodes 103 is
Metal.
Further, in some possible embodiments, which includes copper Cu, nickel, chromium Cr, manganese Mn, silicon Si, tin
At least two elements in Sn, aluminium Al, i.e. resistor main body 101 contain two or more yuan in Cu, Ni, Cr, Mn, Si, Sn, Al
Element alloy.The material of galvanic electrode 102 and voltage measurement electrodes 103 is Cu, preferably anaerobic fine copper or monocrystalline fine copper.Cu has
There is excellent electric conductivity, and cost is relatively low.
In some possible embodiments, galvanic electrode 102 and voltage measurement electrodes 103 pass through high temperature hot pressing and resistance
Ontology 101 combines, and through follow-up accurate machine-shaping.High temperature hot pressing mode can make galvanic electrode 102 and resistor main body 101
And voltage measurement electrodes 103 are combined more secured with resistor main body 101, combination interface resistance smaller.
For the ease of user's volume production, above-mentioned microhm current sense resistor is used to be mounted on a surface of PCB.PCB is
The supporter of electronic component is the carrier of electronic component electrical connection；Due to the consistency of similar printed board, people is avoided
The mistake of work wiring, and can realize that electronic component is mounted, automatic tin soldering, detected automatically automatically, it ensure that the matter of electronic equipment
Amount, improves labor productivity, reduces cost, and is easy to repair.Therefore, the microhm current sense resistor of PCB attachments can
To realize volume production well.
In some possible embodiments, resistor main body 101 is plate, is convenient for resistor main body 101 being mounted on PCB in this way
Upper carry out volume production.Galvanic electrode 102 and voltage measurement electrodes 103 can be, but not limited to be strip.
Galvanic electrode 102 and voltage measurement electrodes 103 can be arranged in the same surface of resistor main body 101, a pair of of voltage
Measuring electrode 103 can the mode of being mutually parallel be arranged between the galvanic electrode 102 that is mutually parallel of a pair.Electricity is both realized in this way
The electric isolution of galvanic electricity pole 102 and voltage measurement electrodes 103, and connect with current loop to be measured convenient for galvanic electrode 102, and
The connection of voltage measurement electrodes 103 and voltage detecting circuit.
Further, as depicted in figs. 1 and 2, resistor main body 101 is arranged fluted；A pair of of galvanic electrode 102 is respectively set
On the boss of groove both sides, a pair of of voltage measurement electrodes 103 are separately positioned on the both ends of groove.Pass through this boss, groove
It is separately positioned, can preferably prevent the contact of galvanic electrode 102 and voltage measurement electrodes 103, improve galvanic electrode 102 with
The separating effect of voltage measurement electrodes 103, to ensure that the microhm current sense resistor uses four line Kelvin connection side of standard
Formula.
Further, as depicted in figs. 1 and 2, the edge of galvanic electrode 102 can be with the edge of voltage measurement electrodes 103
It flushes, to further facilitate galvanic electrode 102 and current loop to be measured and voltage measurement electrodes 103 and voltage detecting circuit
Connection.
In the embodiment of the present invention, the microhm current sense resistor applied to printed wiring board PCB includes resistor main body, one
To galvanic electrode and a pair of of voltage measurement electrodes；A pair of of galvanic electrode is separately positioned on the both ends of resistor main body, for wait for
Measure current loop series connection；A pair of of voltage measurement electrodes be separately positioned on resistor main body both ends and positioned at a pair of of galvanic electrode it
Between, for being connect with voltage detecting circuit；Galvanic electrode is electrically isolated with voltage measurement electrodes.Due to galvanic electrode and voltage measurement
Electrode is electrically isolated, and galvanic electrode is connected with current loop to be measured, and voltage measurement electrodes are connect with voltage detecting circuit, therefore should
Microhm current sense resistor eliminates conductor resistance, contact using four line Kelvin's connection type of standard, in this way connection
Influence of the resistance to resistance value precision；Additionally by the current direction or voltage of transformation measuring circuit for switching current loop to be measured
Direction is connected, influence of the material thermoelectrical potential to current detection accuracy is all can inhibit, to improve the accurate of current detecting result
Degree.
In all examples being illustrated and described herein, any occurrence should be construed as merely illustrative, without
It is as limitation, therefore, other examples of exemplary embodiment can have different values.
It should be noted that：Similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined, then it further need not be defined and explained in subsequent attached drawing in a attached drawing.
In addition, in the description of the embodiment of the present invention unless specifically defined or limited otherwise, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
Can also be electrical connection to be mechanical connection；It can be directly connected, can also indirectly connected through an intermediary, Ke Yishi
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
In the description of the present invention, it should be noted that term "center", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for the description present invention and simplify description, do not indicate or imply the indicated device or element must have a particular orientation,
With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.In addition, term " first ", " second ",
" third " is used for description purposes only, and is not understood to indicate or imply relative importance.
Finally it should be noted that：Embodiment described above, only specific implementation mode of the invention, to illustrate the present invention
Technical solution, rather than its limitations, scope of protection of the present invention is not limited thereto, although with reference to the foregoing embodiments to this hair
It is bright to be described in detail, it will be understood by those of ordinary skill in the art that：Any one skilled in the art
In the technical scope disclosed by the present invention, it can still modify to the technical solution recorded in previous embodiment or can be light
It is readily conceivable that variation or equivalent replacement of some of the technical features；And these modifications, variation or replacement, do not make
The essence of corresponding technical solution is detached from the spirit and scope of technical solution of the embodiment of the present invention, should all cover the protection in the present invention
Within the scope of.Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. a kind of microhm current sense resistor, which is characterized in that be applied to printed wiring board PCB, the microhm electric current inspection
Measuring resistance includes resistor main body, a pair of of galvanic electrode and a pair of of voltage measurement electrodes；
A pair of galvanic electrode is separately positioned on the both ends of the resistor main body, for connecting with current loop to be measured；One
The resistor main body both ends are separately positioned on to the voltage measurement electrodes and between a pair of galvanic electrode, for
Voltage detecting circuit connects；
The galvanic electrode is electrically isolated with the voltage measurement electrodes.
2. microhm current sense resistor according to claim 1, which is characterized in that the resistor main body is plate, institute
It is strip to state galvanic electrode and the voltage measurement electrodes；A pair of voltage measurement electrodes are arranged in a manner of being mutually parallel
Between the galvanic electrode that a pair is mutually parallel.
3. microhm current sense resistor according to claim 2, which is characterized in that the resistor main body is provided with recessed
Slot；A pair of galvanic electrode is separately positioned on the boss of the groove both sides, and a pair of voltage measurement electrodes are set respectively
It sets at the both ends of the groove.
4. microhm current sense resistor according to claim 1, which is characterized in that the material of the resistor main body is to close
Gold.
5. microhm current sense resistor according to claim 4, which is characterized in that the alloy include Cu, Ni, Cr,
At least two elements in Mn, Si, Sn, Al.
6. microhm current sense resistor according to claim 1, which is characterized in that the galvanic electrode and the voltage
The material of measuring electrode is metal.
7. microhm current sense resistor according to claim 6, which is characterized in that the galvanic electrode and the voltage
The material of measuring electrode is Cu.
8. microhm current sense resistor according to claim 1, which is characterized in that the galvanic electrode and the voltage
Measuring electrode is combined by high temperature hot pressing with the resistor main body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810340387.3A CN108565082A (en) | 2018-04-16 | 2018-04-16 | Microhm current sense resistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810340387.3A CN108565082A (en) | 2018-04-16 | 2018-04-16 | Microhm current sense resistor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108565082A true CN108565082A (en) | 2018-09-21 |
Family
ID=63535320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810340387.3A Pending CN108565082A (en) | 2018-04-16 | 2018-04-16 | Microhm current sense resistor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108565082A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110364320A (en) * | 2019-07-24 | 2019-10-22 | 深圳市开步电子有限公司 | A kind of current sense resistor structure |
| WO2021077792A1 (en) * | 2019-10-24 | 2021-04-29 | 南京萨特科技发展有限公司 | Alloy resistor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1272945A (en) * | 1997-10-02 | 2000-11-08 | 松下电器产业株式会社 | Resistor and method for manufacturing the same |
| CN102640233A (en) * | 2009-12-03 | 2012-08-15 | 兴亚株式会社 | Shunt resistor and method for producing same |
| CN103180916A (en) * | 2010-08-26 | 2013-06-26 | 伊莎贝尔努特·霍伊斯勒两合公司 | Current-sensing resistor |
| CN207993595U (en) * | 2018-04-16 | 2018-10-19 | 张照亮 | Microhm current sense resistor |
-
2018
- 2018-04-16 CN CN201810340387.3A patent/CN108565082A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1272945A (en) * | 1997-10-02 | 2000-11-08 | 松下电器产业株式会社 | Resistor and method for manufacturing the same |
| CN102640233A (en) * | 2009-12-03 | 2012-08-15 | 兴亚株式会社 | Shunt resistor and method for producing same |
| CN103180916A (en) * | 2010-08-26 | 2013-06-26 | 伊莎贝尔努特·霍伊斯勒两合公司 | Current-sensing resistor |
| CN207993595U (en) * | 2018-04-16 | 2018-10-19 | 张照亮 | Microhm current sense resistor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110364320A (en) * | 2019-07-24 | 2019-10-22 | 深圳市开步电子有限公司 | A kind of current sense resistor structure |
| WO2021077792A1 (en) * | 2019-10-24 | 2021-04-29 | 南京萨特科技发展有限公司 | Alloy resistor |
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