CN206378535U - A kind of detection platform of small resistor resistance - Google Patents

A kind of detection platform of small resistor resistance Download PDF

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Publication number
CN206378535U
CN206378535U CN201621393713.XU CN201621393713U CN206378535U CN 206378535 U CN206378535 U CN 206378535U CN 201621393713 U CN201621393713 U CN 201621393713U CN 206378535 U CN206378535 U CN 206378535U
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China
Prior art keywords
branch road
measured
resistance
detection platform
microprocessor
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CN201621393713.XU
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Inventor
杜海波
郝欣
马永岗
王祥滨
张嘉豪
张宁
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HANDAN PAIRUI ENERGY-SAVING CONTROL TECHNOLOGY Co Ltd
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HANDAN PAIRUI ENERGY-SAVING CONTROL TECHNOLOGY Co Ltd
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Abstract

The utility model discloses a kind of detection platform of small resistor resistance, including:Precision constant current source, branch road to be measured, reference branch road, signal acquisition circuit and microprocessor, precision constant current source, reference branch road and signal acquisition circuit are sequentially connected, and branch road to be measured is connected with reference branch circuit parallel connection, branch road to be measured includes the testing resistance, and reference branch road includes reference resistor;Signal acquisition circuit is connected with microprocessor, for gathering in branch circuit break to be measured, the reference voltage at reference branch road two ends, and is gathered when branch road to be measured is closed, the voltage to be measured at branch road two ends to be measured;Microprocessor determines the resistance value of testing resistance according to the resistance value of reference resistor, reference voltage and voltage to be measured.The detection platform, by setting precision constant current source to provide stable electric current, by setting reference resistor to eliminate the influence of environmental disturbances, realizes the accurate measurement to small resistor resistance.Testing resistance need to only be accessed to branch road to be measured during measurement, it is simple to operate, it is easy to use.

Description

A kind of detection platform of small resistor resistance
Technical field
The utility model is related to resistance measurement field, more particularly to a kind of detection platform of small resistor resistance.
Background technology
, usually can be due to ignoring the influence of some small resistors in the detection and experimentation of electrical equipment, and cause survey There is larger error between amount data and theoretical value, so as to have impact on the accuracy of measurement result.Due to small resistor resistance very little, It can't detect or detect inaccurate with universal meter.Laboratory would generally carry out the measurement of small resistor resistance, such as favour stone with electric bridge Electric bridge, but electric bridge operating performance is cumbersome, and leveling is difficult.At present, in the market have can with direct reading microhmmeter, but use When microhmmeter tests the resistance of small resistor, test electric current is big, and the testing time is long, and the temperature of measured resistance can rise in test process Height, reduces accuracy of detection.Therefore, how to provide a kind of easy to operate, measure the detection means of accurate small resistor resistance into For the technical problem of those skilled in the art's urgent need to resolve.
The content of the invention
The purpose of this utility model is to provide a kind of detection platform of small resistor resistance, can facilitate, accurately detect small electricity The resistance of resistance.
To achieve the above object, the utility model provides following scheme:
A kind of detection platform of small resistor resistance, the resistance value R for detecting testing resistancex, the detection platform includes: Precision constant current source, branch road to be measured, reference branch road, signal acquisition circuit and microprocessor, wherein,
The precision constant current source is used for the constant current for providing precision;
The precision constant current source, reference branch road and signal acquisition circuit are sequentially connected, and the branch road to be measured and the ginseng Than branch circuit parallel connection connection, the branch road to be measured includes the testing resistance, and the reference branch road includes reference resistor;
The signal acquisition circuit is connected with the microprocessor, described for gathering in the branch circuit break to be measured The reference voltage U at reference branch road two endsf;And for gathering in the branch road to be measured closure, the branch road two ends to be measured are treated Survey voltage Ux
The microprocessor, for the resistance value R according to the reference resistorf, the reference voltage UfWith the electricity to be measured Press Ux, determine the resistance value R of the testing resistancex
Optionally, the detection platform also includes:Constant-current source is extended, respectively with the precision constant current source, the reference branch Road is connected, and for the constant current to be amplified into setting electric current value, and is sent to the reference branch road or is sent to described In reference branch road and branch road to be measured.
Optionally, the detection platform also includes:Display screen, is connected with the microprocessor, described to be measured for showing The resistance value of resistance.
Optionally, the microprocessor is single-chip microcomputer.
Optionally, the detection platform also includes:Filter circuit, respectively with the signal acquisition circuit, the microprocessor Device is connected, for the reference voltage U exported to the signal acquisition circuitfWith the voltage U to be measuredxIt is filtered respectively Afterwards, by the new reference voltage U of correspondence generationfWith new voltage U to be measuredxExport to the microprocessor.
Optionally, the resistance value R for determining the testing resistancexSpecifically include:Pass through formula: Determine the resistance value of the testing resistance.
The specific embodiment provided according to the utility model, the utility model discloses following technique effect:
The detection platform for the small resistor resistance that the utility model is provided, by setting precision constant current source to provide stable electricity Stream, by setting reference branch road to eliminate the influence of environmental disturbances, realizes the accurate measurement to small resistor resistance.Only needed during measurement by Testing resistance accesses branch road to be measured, simple to operate, easy to use.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art In required for the accompanying drawing that uses be briefly described, it should be apparent that, drawings in the following description are only of the present utility model Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to this A little accompanying drawings obtain other accompanying drawings.
Fig. 1 is the structured flowchart of the detection platform of the utility model embodiment 1;
Fig. 2 is the electrical schematic diagram of the precision constant current source of the utility model embodiment 2 and constant-current source expanded circuit.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made The every other embodiment obtained, belongs to the scope of the utility model protection.
The purpose of this utility model is to provide a kind of detection platform of small resistor resistance, can facilitate, accurately detect small electricity The resistance of resistance.
To enable above-mentioned purpose of the present utility model, feature and advantage more obvious understandable, below in conjunction with the accompanying drawings and tool Body embodiment is described in further detail to the utility model.
Embodiment 1:As shown in figure 1, the detection platform of small resistor resistance includes:Precision constant current source 101, extension constant-current source 102nd, reference resistor 104, signal acquisition circuit 105, filter circuit 106, microprocessor 107 and display screen 108.Available for gathering The resistance value of testing resistance 103.
Precision constant current source 101, extension constant-current source 102, reference branch road and Analog-digital Converter (ADC) signal acquisition circuit 105 are sequentially connected, and branch road to be measured is connected with reference branch circuit parallel connection.Wherein, branch road to be measured includes testing resistance 103, reference branch Road includes reference resistor 104.Precision constant current source 101 produces the small constant current of precision, extends constant-current source 102 by accurate small perseverance Current amplifier is determined to setting electric current value.Reference resistor can eliminate ambient influnence, realize precise acquisition.
Signal acquisition circuit 105 is connected with microprocessor 107, during branch circuit break to be measured, i.e., testing resistance 103, which is not accessed, treats When surveying branch road, the reference voltage U at reference branch road two ends is gathered by signal acquisition circuit 105f.During branch road closure to be measured, that is, treat When measuring resistance 103 accesses branch road to be measured, the voltage U to be measured at branch road two ends to be measured is gathered by signal acquisition circuit 105x.Signal Acquisition Circuit collection voltages analog signal, and the voltage analog signal is converted into data signal for determining resistance value.
Filter circuit 106, is connected with signal acquisition circuit 105, microprocessor 107, for signal acquisition circuit respectively The reference voltage U of 105 outputsfWith voltage U to be measuredxAfter being filtered respectively, by the new reference voltage U of correspondence generationfWith it is new Voltage U to be measuredxExport to microprocessor 107.
Microprocessor 107 is according to the resistance value R of reference resistorf, reference voltage UfWith voltage U to be measuredx, pass through formula:Determine the resistance value R of testing resistancex.Display screen 108 is connected with microprocessor 107, to be measured for showing The resistance value R of resistance 103x
Alternatively, signal acquisition circuit 105 be analog-digital converter (Analog-to-DigitalConverter, ADC), microprocessor 107 is STM32 series monolithics, and display screen 108 is industrial Android screen and built-in APP, display screen 108 with Microprocessor 107 is connected by RS232 serial communication modulars.Above-mentioned detection platform not only has record, stores and inquire about each quilt The function of measuring resistance resistance, and with extraordinary human-computer interaction interface.
The detection platform for the small resistor resistance that the utility model is provided, it is accurate permanent when testing resistance does not access detection platform When the electric current in stream source flows through reference resistor, certain pressure drop can be produced;When testing resistance accesses detection platform, reference resistor two The voltage at end can produce change, and microprocessor can draw the resistance of tested small resistor according to Ohm's law.Above-mentioned detection platform Measurement accuracy is high, and Automatic survey degree is high, and reliability is high, and autgmentability is strong, and configuration is flexible, overcomes resistance of the prior art The baroque technical problem of measurement apparatus, with wide applicability.
Embodiment 2:As shown in Fig. 2 precision constant current source circuit 201 is made using high-precision 10V voltage reference sources REF102 For voltage source, using high precision operating amplifier OPA277 as penetrating collection follower.By REF102 GND ends and operational amplifier OPA277 in-phase end connection, operational amplifier OPA277 end of oppisite phase passes through a high-precision resistance R0With the output of voltage source (Vcc) connection is held, then the output current of operational amplifier OPA277 end of oppisite phase is accurate constant current ILOAD, change resistance R0Resistance value be adjustable accurate constant current size.The electric current of precision constant current source output can be according to formula:ILOAD= 10/R0It is determined that, due to R0>=1K Ω, therefore electric current ILOAD≤10mA of precision constant current source output.The accuracy of constant-current source circuit The precision of resistance measurement is directly affected with stability, the degree of accuracy of constant-current source determines the accuracy of measurement result, the present embodiment The precision constant current source circuit of offer, its precision is up to 0.01mA.
Because accurate constant current is smaller, therefore constant-current source expanded circuit must be set to amplify accurate constant current.This reality Apply example and build extension constant-current source circuit using FET IRF840 and the high speed amplifier OPA602 of high precision as core component 202。
Operational amplifier OPA277 end of oppisite phase and OPA602 in-phase end are connected, OPA602 output end is through resistance R3 It is connected to FET IRF840 grid, electric capacity C1With resistance R1It is connected in parallel to form the first parallel branch, the first parallel branch One end and OPA602 in-phase end connect, pass through electric capacity C2OPA602 end of oppisite phase and OPA602 output end are connected, the The other end of one parallel branch passes through resistance R2It is connected respectively with OPA602 end of oppisite phase and IRF840 source electrode, IRF840 leakage Pole connects positive source.Wherein, resistance R is flowed through1Electric current be I1, flow through resistance R2Electric current be I2
Knowable to analysis, I1=ILOAD, I2=(I1*R1)/R2, I3=I1+I2, so I3=ILOAD+(ILOAD*R1)/R2, i.e., it is smart The accurate constant current I of close constant-current source outputLOADThe electric current obtained after extension constant-current source amplification is I3.Constant-current source extension electricity The output end on road is through resistance R3It is connected with ADC signal Acquisition Circuit.The output end of constant-current source expanded circuit with by reference resistor RfWith Testing resistance RxThe second parallel branch connection of composition, another termination power of the second parallel branch.
Wherein, reference resistor RfThe preferential resistance floated from High Precision Low Temperature.When testing resistance is not accessed, branch road to be measured For open circuit, that now ADC signal Acquisition Circuit is collected is Uf;After testing resistance is not accessed, the collection of ADC signal Acquisition Circuit To be Ux.ByIt can obtain:The microprocessor of the present embodiment uses work( The powerful STMicw Electronics's STM32F103RCT6 microprocessors of energy, the Coetex-M3 kernels of ARM32, highest 72M work frequencies Rate, 256K flash memories, 12bit ADC acquisition channels, two analog-digital converters.Wherein, PA7 is ADC acquisition channels, available for gathering Voltage signal.STM32LSB=3.3V/4095 ≈ 0.8mV, i.e., its can collect 0.8mV voltage change, 0.01 Ω resistance Producing 0.8mV change then needs 80mA electric currents, i.e., described I3≥80mA。
The detection platform for the small resistor resistance that the utility model is provided, it is convenient and practical with simple in construction cheap, by mistake Difference is small, the features such as strong antijamming capability, and its measurement accuracy is up to 0.01 Ω, available for the neck such as scientific research and Electronic products manufacturing Domain, with very important realistic meaning.
The process of the detection platform detection resistance value of the present embodiment is as follows:Microcontroller start working after, first determine whether be It is no to have testing resistance access, if without testing resistance access, STM32 is waited for.If there is testing resistance access, etc. Resistance value is sent to Android screen by communicating circuit after resistance is stable and shown.
The detection platform for the small resistor resistance that the utility model is provided has the following technical effect that:
(1) design of precision constant current source is realized, its precision is up to 0.01mA.
(2) STM32 series monolithics acquisition precision is very high, realizes the accurate measurement of small resistor, and its precision is reachable 0.01Ω。
(3) industrial Android screen, special APP built in microprocessor, with display, storage, record, inquiry, tabulation are provided with Deng multiple function, with extraordinary human-computer interaction interface.
The embodiment of each in this specification is described by the way of progressive, and what each embodiment was stressed is and other Between the difference of embodiment, each embodiment identical similar portion mutually referring to.
Specific case used herein is set forth to principle of the present utility model and embodiment, above example Explanation be only intended to help and understand method of the present utility model and its core concept;Simultaneously for the general technology of this area Personnel, according to thought of the present utility model, will change in specific embodiments and applications.In summary, This specification content should not be construed as to limitation of the present utility model.

Claims (5)

1. a kind of detection platform of small resistor resistance, the resistance value R for detecting testing resistancex, it is characterised in that the detection Platform includes:Precision constant current source, branch road to be measured, reference branch road, signal acquisition circuit and microprocessor, wherein,
The precision constant current source is used for the constant current for providing precision;
The precision constant current source, reference branch road and signal acquisition circuit are sequentially connected, and the branch road to be measured and the reference branch Road is connected in parallel, and the branch road to be measured includes the testing resistance, and the reference branch road includes reference resistor;
The signal acquisition circuit is connected with the microprocessor, for gathering in the branch circuit break to be measured, the reference The reference voltage U at branch road two endsf;And for gathering in the branch road closure to be measured, the electricity to be measured at the branch road two ends to be measured Press Ux
The microprocessor, for the resistance value R according to the reference resistorf, the reference voltage UfWith the voltage to be measured Ux, determine the resistance value R of the testing resistancex
2. the detection platform of small resistor resistance according to claim 1, it is characterised in that the detection platform also includes: Constant-current source is extended, is connected respectively with the precision constant current source, the reference branch road, for the constant current to be amplified into setting Current value, and send to the reference branch road or send into the reference branch road and branch road to be measured.
3. the detection platform of small resistor resistance according to claim 1, it is characterised in that the detection platform also includes: Display screen, is connected with the microprocessor, the resistance value for showing the testing resistance.
4. the detection platform of small resistor resistance according to claim 1, it is characterised in that the microprocessor is monolithic Machine.
5. the detection platform of small resistor resistance according to claim 1, it is characterised in that the detection platform also includes: Filter circuit, is connected with the signal acquisition circuit, the microprocessor respectively, for what is exported to the signal acquisition circuit The reference voltage UfWith the voltage U to be measuredxAfter being filtered respectively, by the new reference voltage U of correspondence generationfWith it is new Voltage U to be measuredxExport to the microprocessor.
CN201621393713.XU 2016-12-19 2016-12-19 A kind of detection platform of small resistor resistance Active CN206378535U (en)

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Application Number Priority Date Filing Date Title
CN201621393713.XU CN206378535U (en) 2016-12-19 2016-12-19 A kind of detection platform of small resistor resistance

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109358236A (en) * 2018-10-16 2019-02-19 Oppo广东移动通信有限公司 For measuring the circuit and method of resistance

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109358236A (en) * 2018-10-16 2019-02-19 Oppo广东移动通信有限公司 For measuring the circuit and method of resistance
CN109358236B (en) * 2018-10-16 2022-01-07 Oppo广东移动通信有限公司 Circuit and method for measuring resistance

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