CN205981496U - A resistance measurement device for thermal resistance automatic verification system - Google Patents
A resistance measurement device for thermal resistance automatic verification system Download PDFInfo
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- CN205981496U CN205981496U CN201621005096.1U CN201621005096U CN205981496U CN 205981496 U CN205981496 U CN 205981496U CN 201621005096 U CN201621005096 U CN 201621005096U CN 205981496 U CN205981496 U CN 205981496U
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- thermal resistance
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Abstract
The utility model provides a resistance measurement device for thermal resistance automatic verification system, includes singlechip, two constant current sources, two pressure measurement units and two relays, and first constant current source provides forward current through the first contact of first relay for the thermal resistance, and the forward voltage of thermal resistance is measured to first pressure measurement unit through the second contact of first relay, the second constant current source provides reverse current through the first contact of second relay for the thermal resistance, and second pressure measurement unit passes through the reverse voltage of the second contact measurement thermal resistance of second relay, the input of the output termination singlechip of two pressure measurement units, the control coil of two relays connect the output of singlechip, the singlechip passes through communication cable and computer link. The utility model discloses let in not equidirectional measuring current for the thermal resistance to utilize the resistance of the average value calculation thermal resistance of positive counter voltage, make the thermoelectric force of two orientations offset, thereby eliminated the influence of thermoelectric force to the voltage measurement value, guaranteed the accuracy of examining and determine the result.
Description
Technical field
This utility model is related to a kind of electric resistance measuring apparatus used in automatic Thermal Resistance Verification System, belongs to measurement skill
Art field.
Background technology
Thermal resistance (thermal resistor) is a kind of the most frequently used temperature detector of middle low-temperature space, and thermal resistance is carried out
During calibrating, first thermal resistance is put in temperature chamber, oil bath temperature is adjusted to calibrating point, then measures its resistance value, according to
Resistance under each proving temperature point judges whether thermal resistance is qualified.The electric resistance measuring apparatus one of conventional thermal resistance automatic verification system
As be made up of constant-current source, voltage detecting circuit data processing unit, constant-current source provides constant DC current, electricity to thermal resistance
Pressure testing circuit is used for measuring thermal resistance terminal voltage at constant current, and data processing unit is according to the electric current of thermal resistance and electricity
Pressure value can calculate its resistance under proving temperature point.The shortcoming of this electric resistance measuring apparatus can not eliminate thermoelectrical potential
Impact, measured thermal resistance terminal voltage is relevant with the sense of current, equal to the pressure drop in the internal resistance of thermal resistance and thermoelectrical potential and
Or poor, cause voltage measuring value fluctuation range larger it is impossible to ensure the accuracy of verification result.
Utility model content
The purpose of this utility model is the drawback for prior art, provides one kind to be used for automatic Thermal Resistance Verification System
Electric resistance measuring apparatus, to eliminate the impact to thermal resistance terminal voltage for the thermoelectrical potential it is ensured that the accuracy of verification result.
Problem described in the utility model is to be solved with following technical proposals：
A kind of electric resistance measuring apparatus for automatic Thermal Resistance Verification System, composition include single-chip microcomputer, two constant-current sources,
Two pressure measuring units and two relays, the first normally opened contact that the first constant-current source passes through the first relay just provides to thermal resistance
To detection electric current, the first pressure measuring unit passes through the forward voltage of the second normally opened contact measurement thermal resistance of the first relay；Second
Constant-current source provides inverse detection electric current by the first normally opened contact of the second relay to thermal resistance, and the second pressure measuring unit passes through the
Second normally opened contact of two relays measures the backward voltage of thermal resistance；The outfan of two pressure measuring units connects the input of single-chip microcomputer
End, the control coil of two relays connects the outfan of single-chip microcomputer, and described single-chip microcomputer passes through communication cable with host computer even
Connect.
The above-mentioned electric resistance measuring apparatus for automatic Thermal Resistance Verification System, described first constant-current source includes the first computing and puts
Big device and first resistor, the input in the same direction of the first operational amplifier connects the output port of single-chip microcomputer, and reverse input end is through first
Resistance eutral grounding, the first normally opened contact of a end first relay of thermal resistance to be examined and determine connects the outfan of the first operational amplifier,
B terminates the reverse input end of the first operational amplifier.
The above-mentioned electric resistance measuring apparatus for automatic Thermal Resistance Verification System, described first pressure measuring unit includes the second computing
Amplifier and four resistance, a end of one end reception calibrating thermal resistance of second resistance, the other end is second normal through the first relay
Open the input in the same direction that contact connects the second operational amplifier, the reverse input end of the second operational amplifier is received by 3rd resistor
The b end of calibrating thermal resistance by the 4th resistance eutral grounding, the outfan of the second operational amplifier connects the input port of single-chip microcomputer simultaneously
Connect in-phase input end through the 5th resistance.
The above-mentioned electric resistance measuring apparatus for automatic Thermal Resistance Verification System, described second constant-current source includes the 3rd computing and puts
Big device and the 6th resistance, the input in the same direction of the 3rd operational amplifier connects the output port of single-chip microcomputer, and reverse input end is through the 6th
Resistance eutral grounding, the first normally opened contact of b end second relay of thermal resistance to be examined and determine connects the outfan of the 3rd operational amplifier,
A terminates the reverse input end of the 3rd operational amplifier.
The above-mentioned electric resistance measuring apparatus for automatic Thermal Resistance Verification System, described second pressure measuring unit includes the 4th computing
Amplifier and four resistance, the b end of one end reception calibrating thermal resistance of the 7th resistance, the other end is second normal through the second relay
Open the input in the same direction that contact connects four-operational amplifier, the reverse input end of four-operational amplifier passes through the 8th resistance reception
The a end of calibrating thermal resistance by the 9th resistance eutral grounding, the outfan of four-operational amplifier connects the input port of single-chip microcomputer simultaneously
Connect in-phase input end through the tenth resistance.
This utility model priority is passed through the detection electric current of different directions to thermal resistance, and flat using both forward and reverse directions terminal voltage
The resistance of mean value computation thermal resistance, makes the thermoelectrical potential of both direction offset, thus eliminating the shadow to voltage measuring value for the thermoelectrical potential
Ring it is ensured that the accuracy of verification result.
Brief description
Fig. 1 is electrical schematic diagram of the present utility model.
The each list of reference numerals of in figure is：PC, computer；U1, single-chip microcomputer；F1～F4, the first operational amplifier～the 4th computing
Amplifier；J1, the first relay；J2, the second relay；Rt, thermal resistance；R1～R10, first resistor～the tenth resistance.
Specific embodiment
The utility model is described in further detail below in conjunction with the accompanying drawings.
Referring to Fig. 1, this utility model include computer PC, single-chip microcomputer U1, the first relay J1, the second relay J2, four
Individual F1～F4 and ten resistance R1～R10 of operational amplifier, wherein, the first operational amplifier F1 and first resistor R1 constitute first
Constant-current source, the 3rd operational amplifier F3 and the 6th resistance R6 constitute the second constant-current source, the second operational amplifier F2 and four resistance
(second resistance R2～the 5th resistance R5) constitutes the first pressure measuring unit, four-operational amplifier F4 and four resistance (second resistances
R7～the 5th resistance R10) constitute the second pressure measuring unit.
The measuring method of thermal resistance resistance：
It is adjusted to calibrating point according to Fig. 1 tested thermal resistance Rt of access and by oil bath temperature, during measurement, single-chip microcomputer U1 makes first
Two normally opened contact closures of the first relay J1, its REF1 port output reference voltage simultaneously, CHX1 analog input channel is opened
Logical, start to gather forward voltage signal, then the first relay J1 is discharged by single-chip microcomputer U1, and two of the second relay J2 are normally opened
The closing of contact, single-chip microcomputer REF2 output reference voltage, CHX2 analog input channel is open-minded, starts to gather reverse voltage signal,
So complete two circulations, gather 4 voltage signals altogether, these signals are passed to computer PC by single-chip microcomputer U1, and computer is first
Calculate the meansigma methodss (not contained thermoelectrical potential in meansigma methodss) of four voltage signals, then utilize this meansigma methods and detection current value meter
Calculate the resistance of thermal resistance.
Claims (5)
1. a kind of electric resistance measuring apparatus for automatic Thermal Resistance Verification System, is characterized in that, composition include single-chip microcomputer (U1),
Two constant-current sources, two pressure measuring units and two relays, the first constant-current source is normally opened tactile by the first of the first relay (J1)
Point provides positive detection electric current to thermal resistance (Rt), and the second normally opened contact that the first pressure measuring unit passes through the first relay (J1) is surveyed
The forward voltage of calorimetric resistance (Rt)；Second constant-current source passes through the first normally opened contact of the second relay (J2) to thermal resistance (Rt)
There is provided inverse detection electric current, the second normally opened contact that the second pressure measuring unit passes through the second relay (J2) measures thermal resistance (Rt)
Backward voltage；The outfan of two pressure measuring units connects the input of single-chip microcomputer (U1), and the control coil of two relays connects single-chip microcomputer
(U1) outfan, described single-chip microcomputer (U1) is connected with host computer (PC) by communication cable.
2. the electric resistance measuring apparatus for automatic Thermal Resistance Verification System according to claim 1, is characterized in that, described
One constant-current source includes the first operational amplifier (F1) and first resistor (R1), the termination of input in the same direction of the first operational amplifier (F1)
The output port of single-chip microcomputer (U1), reverse input end is grounded through first resistor (R1), a end first of thermal resistance (Rt) to be examined and determine
First normally opened contact of relay (J1) connects the outfan of the first operational amplifier (F1), and b terminates the first operational amplifier (F1)
Reverse input end.
3. the electric resistance measuring apparatus for automatic Thermal Resistance Verification System according to claim 1 and 2, is characterized in that, institute
State the first pressure measuring unit and include the second operational amplifier (F2) and four resistance, one end reception calibrating thermoelectricity of second resistance (R2)
The a end of resistance (Rt), the second normally opened contact through the first relay (J1) for the other end connects the defeated in the same direction of the second operational amplifier (F2)
Enter end, the reverse input end of the second operational amplifier (F2) is by the b end of 3rd resistor (R3) reception calibrating thermal resistance (Rt) simultaneously
It is grounded by the 4th resistance (R4), the outfan of the second operational amplifier (F2) connects the input port of single-chip microcomputer (U1) and through the 5th
Resistance (R5) connects in-phase input end.
4. the electric resistance measuring apparatus for automatic Thermal Resistance Verification System according to claim 3, is characterized in that, described
Two constant-current sources include the 3rd operational amplifier (F3) and the 6th resistance (R6), the termination of input in the same direction of the 3rd operational amplifier (F3)
The output port of single-chip microcomputer (U1), reverse input end is grounded through the 6th resistance (R6), the b end second of thermal resistance (Rt) to be examined and determine
First normally opened contact of relay (J2) connects the outfan of the 3rd operational amplifier (F3), and a terminates the 3rd operational amplifier (F3)
Reverse input end.
5. the electric resistance measuring apparatus for automatic Thermal Resistance Verification System according to claim 4, is characterized in that, described
Two pressure measuring units include four-operational amplifier (F4) and four resistance, one end reception calibrating thermal resistance of the 7th resistance (R7)
(Rt) b end, the second normally opened contact through the second relay (J2) for the other end connects the input in the same direction of four-operational amplifier (F4)
End, the reverse input end of four-operational amplifier (F4) passes through a end of the 8th resistance (R8) reception calibrating thermal resistance (Rt) and leads to
Cross the 9th resistance (R9) ground connection, the outfan of four-operational amplifier (F4) connects the input port of single-chip microcomputer (U1) and through the tenth electricity
Resistance (R10) connects in-phase input end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621005096.1U CN205981496U (en) | 2016-08-31 | 2016-08-31 | A resistance measurement device for thermal resistance automatic verification system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621005096.1U CN205981496U (en) | 2016-08-31 | 2016-08-31 | A resistance measurement device for thermal resistance automatic verification system |
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| Publication Number | Publication Date |
|---|---|
| CN205981496U true CN205981496U (en) | 2017-02-22 |
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ID=58038897
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621005096.1U Active CN205981496U (en) | 2016-08-31 | 2016-08-31 | A resistance measurement device for thermal resistance automatic verification system |
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| CN (1) | CN205981496U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106990295A (en) * | 2017-05-23 | 2017-07-28 | 江南工业集团有限公司 | A kind of resistance measuring instrument and resistance measurement method |
| CN112394229A (en) * | 2021-01-21 | 2021-02-23 | 广州思泰信息技术有限公司 | Insulation resistance testing device and insulation resistance testing method |
-
2016
- 2016-08-31 CN CN201621005096.1U patent/CN205981496U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106990295A (en) * | 2017-05-23 | 2017-07-28 | 江南工业集团有限公司 | A kind of resistance measuring instrument and resistance measurement method |
| CN112394229A (en) * | 2021-01-21 | 2021-02-23 | 广州思泰信息技术有限公司 | Insulation resistance testing device and insulation resistance testing method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 065099 Yongnian County 47223 Factory Yongnian County Haixiang Machinery Factory, Handan City, Hebei Province Patentee after: Haixiang Machinery Factory, Yongnian District, Handan City Address before: 065099 Yongnian County 47223 Factory Yongnian County Haixiang Machinery Factory, Handan City, Hebei Province Patentee before: YONGNIAN COUNTY HAIXIANG MACHINERY FACTORY |