CN201449411U - Multichannel current sampling circuit - Google Patents
Multichannel current sampling circuit Download PDFInfo
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- CN201449411U CN201449411U CN2009200475541U CN200920047554U CN201449411U CN 201449411 U CN201449411 U CN 201449411U CN 2009200475541 U CN2009200475541 U CN 2009200475541U CN 200920047554 U CN200920047554 U CN 200920047554U CN 201449411 U CN201449411 U CN 201449411U
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Abstract
The utility model discloses a multichannel current sampling circuit which comprises a multichannel input circuit, a sampling circuit, a multiplex selector switch circuit and an output control circuit, and is characterized in that the current sampling circuit further comprises a precorrection current generation circuit and a switching-over control current; the input terminal of an integrated operational amplifier in the precorrection current generation circuit is connected with the output terminal of the output control circuit, the output terminal thereof is connected into a current control and feedback circuit, and the current feedback terminal is connected with the integrated operational amplifier; the switching-over control current is formed by a plurality of relays; one end of each relay is connected with the corresponding input channel, and the other end is connected in parallel on the output terminal of the precorrection current generation circuit; and the output terminal of the switching-over control current is connected with the sampling circuit, and the switching-over control terminal thereof is connected with the output terminal of output control circuit. In the utility model, actual switching-in valve of a sampling resistor can be calculated through additionally arranging the precorrection current generation circuit, errors are avoided and accurate detection of multichannel and batch products is realized.
Description
Technical field
The utility model relates to a kind of sample circuit, is specifically related to a kind of hyperchannel current sampling circuit, is applicable in the commercial production test to typical products in mass production.
Background technology
Current sampling circuit is the circuit that arrives commonly used in some product tests and the control system, and is medium as the test macro that automobile lamp is produced, and observes and be recorded in the current value in the testing process, whether satisfies testing standard with this various characteristics of judging product.Common sampling process is: one tunnel electric current to be measured inputs in the sample circuit, obtain an output signal value, this signal value is connected with single-chip microcomputer through an A/D converter, single-chip microcomputer is found out value corresponding with the digital signal that receives according to the table of comparisons that defaults in the machine, and shows on connected display device.Above-mentioned sample circuit is often realized with current transformer or powerful sampling resistor, and this circuit is only applicable to the product test to single path, short run, in other words be only applicable to the stage that use in the laboratory, when being used for commercial production typical products in mass production tested, just must adopt the input mode of multi-path, adapting to the needs of production efficiency, and so just there are problems such as cost height, volume is big, thermal value is big, thereby no longer are fit to use.
For addressing the above problem, occur and adopt the sample circuit of constantan wire as current sampling resistor, reduce volume with this, reduce cost.But find in the reality test, because the bifurcated characteristic of sampling resistor, the resistance of constantan wire generally all smaller (generally all between 0.001 ohm to 1 ohm), especially after welding, that section resistance in the pad will be by short circuit, the effective length of resistance will diminish and be inconsistent, thereby cause test result inaccurate, this is owing to circuit board is that thickness is arranged, the part that constantan wire passes via hole just is metallized the via hole short circuit, the resistance value of this section will diminish, so common engineering teacher does single sample and often can pass through at the sample resistance that the design constantan wire forms, but it is just unstable to bulk article, often find that current sampling data has deviation, so just can not meet the stability and the accuracy requirement that must guarantee, also be not suitable for using the bulk article test.
Summary of the invention
The utility model purpose provides a kind of hyperchannel current sampling circuit, uses this circuit, can improve measuring accuracy and testing efficiency greatly, is applicable to the bulk article test in the commercial production.
For achieving the above object, the technical solution adopted in the utility model is: a kind of hyperchannel current sampling circuit, comprise multi-path input circuit, sample circuit, multidiameter option switch circuit and output control circuit, comprise that also a precorrection current generating circuit and switches control circuit, described precorrection current generating circuit comprises an integrated transporting discharging and a Current Control and feedback circuit, the input end of described integrated transporting discharging is connected with the correction signal output terminal of described output control circuit, and its output terminal inserts described Current Control and feedback circuit; Described control switching circuit is made of the relay with the corresponding number of described multi-path input circuit input channel number, one end of each relay connects with corresponding input channel, the other end is connected on the output terminal of described Current Control and feedback circuit, the output terminal of described control switching circuit is connected with described sample circuit, and its switching controls end selects signal output part to be connected with the correction of described output control circuit.
In the technique scheme, described multi-path input circuit is an interface circuit that inserts with outside electric current to be measured, electric current to be measured is provided with as required, enter control switching circuit from 1～N road (1～16) by interface circuit, the corresponding relay that switches in the control circuit that inserts of each path, corresponding respectively normal input end and the correcting current input end of detecting in two contacts of relay, described output control circuit can adopt the control circuit that was in the past constituted by A/D converter and single-chip microcomputer, also can adopt control circuit that data collecting card and PC constitute etc., give multidiameter option switch circuit and control switching circuit respectively as long as can provide 2 groups of gating signals, have one tunnel simulating signal to input in addition again to go in the precorrection current generating circuit just passable. its course of work is: when normally detecting, electric current to be measured inputs to control switching circuit from the multi-path input circuit, sample to current sampling circuit again, the signal that sampling draws is input in the multidiameter option switch circuit, the gating signal that the multidiameter option switch circuit provides according to output control circuit is selected passage to be measured, and is input in the output control circuit and goes; Timing: provide a simulating signal to the precorrection current generating circuit by output control circuit, the output calibration electric current is to control switching circuit, output control circuit provides the signal that needs correction path and gives control switching circuit simultaneously, corresponding relay is switched to be connected on the contact with correcting current, correcting current inputs in the sample circuit through control switching circuit, output sampled signal through the multidiameter option switch circuit in output control circuit, this input signal is the current known signal, in order to carry out correction calculation, draw the actual value of constantan wire sampling resistor in this path up-sampling circuit, afterwards during this path input test signal, just calculate with the actual value of proofreading and correct, can obtain more accurate current sampling data like this. this function is proofreaied and correct after switching according to user's demand, general only need circuit component (or environment) change or through the test official hour after once proofread and correct again, circuit all is in test function at ordinary times.
In the technique scheme, described Current Control and feedback circuit are a field effect transistor and one group of common drain amplifying circuit of regulating the resistance composition in parallel, the gate input of described field effect transistor is connected with the output terminal of described integrated transporting discharging, source electrode is connected with described adjusting resistance, and the drain electrode output terminal is connected with described control switching circuit.
Further technical scheme is, also comprise the anti-jamming circuit that constitutes by a voltage follower circuit and isolating amplifier circuit series connection in the described precorrection current generating circuit, the correction signal output terminal of described output control circuit is connected with described voltage follower circuit input end, and the output terminal of described isolating amplifier circuit is connected with the input end of described integrated transporting discharging.
In the technique scheme, described output control circuit comprises that a data collecting card and has the microprocessor of software program, the control signal of described microprocessor output inputs in the described multidiameter option switch circuit through described data collecting card, and the output signal of multidiameter option switch circuit inputs in the described microprocessor through this data collecting card.The microprocessor that has the LabVIEW software program of NI company, as data processing and control platform, can write down the data that all need, thus can realize the monitored picture of real time data very easily, abnormal data gather and all historical datas gather function.
Further technical scheme is, be serially connected with the anti-jamming circuit that a voltage follower circuit and an isolating amplifier circuit are connected and constituted between described multidiameter option switch circuit and the described data collecting card, described multidiameter option switch circuit output end is connected with described voltage follower circuit input end, and the output terminal of described isolating amplifier circuit is connected with described data collecting card input end.
Optimized technical scheme is that described data collecting card is connected with described multidiameter option switch circuit through an optical coupling isolator.By optical coupling isolator, control signal and sample rate current signal to be measured have been realized electrical isolation fully, thereby have increased the reliability and the antijamming capability of circuit, working stability greatly.
Because the technique scheme utilization, the advantage that the utility model compared with prior art has is:
1, because the utility model is provided with a precorrection current generating circuit, between correcting current and detection electric current, import switching by control switching circuit, need be to sampling resistor value timing in the dedicated tunnel sample circuit, send correction by output control circuit and select signal, switch to the correcting current input signal, after sampling, draw actual corrected value, in backward all computings and amplifying circuit, all use the value after proofreading and correct to carry out, can obtain more accurate current sampling data like this, thereby avoid the accuracy of the deviation effects that the causes output sample rate current value of constantan wire sampling resistor and interlock circuit, guarantee hyperchannel, detect the high precision of data when bulk article detects, realize that industrial mass detects;
2, the output control circuit that adopts data collecting card and the microprocessor that has software program to form, sampling rate is improved on the one hand, the sample rate current scope can be from 10mA～10A, satisfy the use in very big certain applications place, realize processing and the control of computer software on the other hand to the sample circuit data, with the control mode comparison of single-chip microcomputer in the past, improved functional and practicality;
3, between data collecting card and the multidiameter option switch circuit optical coupling isolator is set; import isolation, make system improve common-mode rejection ratio, and make this circuit that fabulous interference free performance be arranged; can protect electronic equipment and personal safety simultaneously, be suitable for using under the industrial environment.
Description of drawings
Fig. 1 is the schematic block circuit diagram of the utility model embodiment one;
Fig. 2 is the commutation circuit among the utility model embodiment one;
Fig. 3 is the sample circuit of a passage among the utility model embodiment one;
Fig. 4 is multidiameter option switch and an isolating amplifier circuit among the utility model embodiment one;
Fig. 5 is the precorrection current generating circuit among the utility model embodiment one.
Embodiment
Below in conjunction with drawings and Examples the utility model is further described:
Embodiment one: extremely shown in Figure 5 referring to Fig. 1, a kind of hyperchannel current sampling circuit, comprise the multi-path input circuit, control switching circuit, sample circuit, the multidiameter option switch circuit, precorrection current generating circuit and output control circuit, described precorrection current generating circuit comprises an integrated transporting discharging AD711 and a Current Control and feedback circuit, the positive input of described integrated transporting discharging AD711 is connected with the correction signal output terminal of described output control circuit, its current feedback terminal its output terminal that is connected with the integrated transporting discharging reverse input end inserts described Current Control and feedback circuit, and the output terminal of this Current Control and feedback circuit is connected in the control switching circuit; Described output control circuit comprises that a data collecting card PCI6251M and has the microprocessor of software program, the control signal of described microprocessor output inputs in the described multidiameter option switch circuit through described data collecting card PCI6251M, and the output signal of multidiameter option switch circuit inputs in the described microprocessor through this data collecting card PCI6251M.
As shown in Figure 2, described control switching circuit is made of the relay with the corresponding number of described multi-path input circuit input channel number, 2 pin of each relay, 9 pin contacts and corresponding input channel connection, 4 pin contacts are connected on the output terminal of described precorrection current generating circuit, 7 pin are connected with ground, 3 pin, 8 pin output terminals select signal output part D4～D7 pin to be connected with corresponding sample circuit connection, switching controls end with the correction of data collecting card PCI6251M.This part circuit is to utilize relay to finish the function of switching controls is carried out in test and calibration function, channel selecting signal D4～D7 is by the digital I output of data collecting card PCI6251M, decipher selection by code translator, normally output is exactly high level, and this moment, the normally closed function of relay was test function (being input as the signal through the input channel input).10 road signal Current01～Current10 have been adopted in the present embodiment, have at the passage of choosing this moment and low level just occurs, can see the relay generation redirect among Fig. 2 this moment, switch to calibration function, the input of this moment is the current known signal that has the precorrection current generating circuit to produce, in order to carry out the calculating of calibration function.
As shown in Figure 3, the sample circuit of one of them passage, the port number of actual needs is identical with the input channel number. and using constantan wire is raw-material sampling resistor R1, C1 is as filter capacitor, sample rate current carries out the voltage signal that difference is amplified to be become after the amplification by the AD621 instrument amplifier, this voltage signal is the input signal of follow-up circuit multidiameter option switch and isolating amplifier circuit. the pin 1 and 8 of AD621 is carried out short circuit, to gain and accurately be set to 100, when the sampling resistor that adopts 0.01 ohm, Shu Ru voltage is exactly U=R like this
1* I*G=0.01*I*100=I (V), if this moment, input current was 2.5A, the output signal of AD621 is exactly 2.5V so.This can change according to practical application.
As shown in Figure 4, be serially connected with the anti-jamming circuit that a voltage follower circuit and an isolating amplifier circuit are connected and constituted between described multidiameter option switch circuit and the described data collecting card PCI6251M, described multidiameter option switch circuit output end is connected with described voltage follower circuit input end, and the output terminal of described isolating amplifier circuit is connected with described data collecting card PCI6251M input end.The function of this circuit is converted to 1 tunnel output signal to the multichannel input signal by 16 tunnel change-over switches exactly, by voltage follow output, outputs to data collecting card PCI6251M again after isolating amplifier then.Isolate by optical coupling isolator; output signal does not have influence to input end; input to the A0～A3 pin of change-over switch through optical coupling isolator by data collecting card D0～D3 output gating signal; S1～S10 is the sample circuit input signal; the D pin is output; follow again behind isolating amplifier circuit among the input data collecting card PCI6251M through the one-level amplifier; the small-signal that isolated amplifier is applied under the high common mode voltage environment is measured; measurand and data acquisition system (DAS) are isolated; thereby the raising common-mode rejection ratio has been protected electronic equipment and personal safety simultaneously.
As shown in Figure 5, described Current Control and feedback circuit are the adjusting resistance R 25 of a field effect transistor Q1 and one group of parallel connection, the common drain amplifying circuit that R24 forms, gate input 2 pin of described field effect transistor Q1 are connected with output terminal 6 pin of described integrated transporting discharging AD711, source electrode 3 pin are connected with described adjusting resistance, and drain electrode output terminal 1 pin is connected with described control switching circuit repeat circuit 4 pin.Input end 3 pin of integrated transporting discharging are connected with data collecting card PCI6251M through the anti-jamming circuit of a voltage follower circuit and isolating amplifier circuit series connection formation, the road simulating signal that provides by data collecting card PCI6251M (10V～10V), the correcting current that can produce as required big or small defined by the user, signal is exported by voltage follow, go through outputing among the integrated transporting discharging AD711 behind the isolation transport and placing device again, the output of integrated transporting discharging AD711 is through P channel fet pipe Q1, and the precorrection current signal of generation outputs in the control switching circuit and goes.According to the characteristics of amplifier, the size that we can calculate the precorrection electric current is:
Here V
iBeing exactly the simulating signal that data collecting card PCI6251M provides, by voltage follow with isolate amplifier, still is identical amplitude during to the input of integrated transporting discharging AD711.R24 and R25 be as regulating resistance, can be when needs change precorrection electric current big or small, and V
iCooperate change, can realize wider changing value like this.
In the present embodiment, microprocessor is the PC that has LabVIEW software, as data processing and control platform, can write down the data that all need, and realizes the monitoring of real time data very easily, abnormal data gather and all historical datas gather function.
Claims (6)
1. hyperchannel current sampling circuit, comprise multi-path input circuit, sample circuit, multidiameter option switch circuit and output control circuit, it is characterized in that: comprise that also a precorrection current generating circuit and switches control circuit, described precorrection current generating circuit comprises an integrated transporting discharging and a Current Control and feedback circuit, the positive input of described integrated transporting discharging is connected with the correction signal output terminal of described output control circuit, and its output terminal inserts described Current Control and feedback circuit; Its current feedback terminal is connected with the integrated transporting discharging reverse input end; Described control switching circuit is made of the relay with the corresponding number of described multi-path input circuit input channel number, one end of each relay connects with corresponding input channel, the other end is connected on the output terminal of described Current Control and feedback circuit, the output terminal of described control switching circuit is connected with described sample circuit, and its switching controls end selects signal output part to be connected with the correction of described output control circuit.
2. hyperchannel current sampling circuit according to claim 1, it is characterized in that: described Current Control and feedback circuit are a field effect transistor and one group of common drain amplifying circuit of regulating the resistance composition in parallel, the gate input of described field effect transistor is connected with the output terminal of described integrated transporting discharging, source electrode is connected with described adjusting resistance, and the drain electrode output terminal is connected with described control switching circuit.
3. hyperchannel current sampling circuit according to claim 1 and 2, it is characterized in that: also comprise the anti-jamming circuit that constitutes by a voltage follower circuit and isolating amplifier circuit series connection in the described precorrection current generating circuit, the correction signal output terminal of described output control circuit is connected with described voltage follower circuit input end, and the output terminal of described isolating amplifier circuit is connected with the input end of described integrated transporting discharging.
4. hyperchannel current sampling circuit according to claim 1, it is characterized in that: described output control circuit comprises that a data collecting card and has the microprocessor of software program, the control signal of described microprocessor output inputs in the described multidiameter option switch circuit through described data collecting card, and the output signal of multidiameter option switch circuit inputs in the described microprocessor through this data collecting card.
5. hyperchannel current sampling circuit according to claim 4, it is characterized in that: be serially connected with the anti-jamming circuit that a voltage follower circuit and an isolating amplifier circuit are connected and constituted between described multidiameter option switch circuit and the described data collecting card, described multidiameter option switch circuit output end is connected with described voltage follower circuit input end, and the output terminal of described isolating amplifier circuit is connected with described data collecting card input end.
6. according to claim 4 or 5 described hyperchannel current sampling circuits, it is characterized in that: described data collecting card is connected with described multidiameter option switch circuit through an optical coupling isolator.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009200475541U CN201449411U (en) | 2009-07-02 | 2009-07-02 | Multichannel current sampling circuit |
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| CN2009200475541U CN201449411U (en) | 2009-07-02 | 2009-07-02 | Multichannel current sampling circuit |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102650854A (en) * | 2012-04-23 | 2012-08-29 | 广州市新锘威智能科技有限公司 | Input/output passage multiplexing intelligent controller |
| CN102680910A (en) * | 2012-05-15 | 2012-09-19 | 华为技术有限公司 | Supply current detection method and circuit |
| CN102944736A (en) * | 2012-11-22 | 2013-02-27 | 江苏大为科技股份有限公司 | Circuit for detecting wide-range, high-precision and multichannel currents based on optical couplings |
| CN102967749A (en) * | 2012-11-15 | 2013-03-13 | 无锡中亚工具厂 | Current sampler with amplifying circuit |
| CN103134975A (en) * | 2013-02-04 | 2013-06-05 | 昆山尼赛拉电子器材有限公司 | Simple multi-channel current tester |
| CN103714025A (en) * | 2013-12-31 | 2014-04-09 | 厦门市美亚柏科信息股份有限公司 | Interface control equipment, data acquisition system and equipment connection control method |
| CN104269041A (en) * | 2014-08-29 | 2015-01-07 | 中国运载火箭技术研究院 | High bit rate data acquisition and transmission system based on star topology framework |
| CN105911313A (en) * | 2016-04-26 | 2016-08-31 | 国网河南省电力公司商丘供电公司 | Electric isolation switch terminal bar test sensor |
| CN106160727A (en) * | 2016-06-22 | 2016-11-23 | 青岛海信日立空调***有限公司 | A kind of isolation circuit and isolation circuit control method |
| CN106405187A (en) * | 2016-08-16 | 2017-02-15 | 江苏东方航天校准检测有限公司 | Adaptive controllable air resistor |
| CN106949675A (en) * | 2017-04-05 | 2017-07-14 | 珠海格力电器股份有限公司 | A kind of electronic expansion valve controls signal supervisory instrument |
| CN106950034A (en) * | 2016-01-07 | 2017-07-14 | 中兴通讯股份有限公司 | Light source state detecting system and method |
| CN107834977A (en) * | 2017-11-23 | 2018-03-23 | 湖南红太阳新能源科技有限公司 | A kind of photovoltaic module intelligent wiring box and its control method |
| CN108180939A (en) * | 2017-12-26 | 2018-06-19 | 中国航发四川燃气涡轮研究院 | A kind of multifunctional data acquisition card and measuring method |
| CN109240174A (en) * | 2018-10-30 | 2019-01-18 | 南宁学院 | A kind of optional control system of multiplexer (MUX |
| CN109342574A (en) * | 2018-12-03 | 2019-02-15 | 中国海洋大学 | A kind of sound emission multichannel fast switching system and switching method |
| CN109708691A (en) * | 2018-12-07 | 2019-05-03 | 岭东核电有限公司 | A kind of multichannel temperature and ess-strain on-line measurement integrated system and method |
| CN110376947A (en) * | 2019-07-26 | 2019-10-25 | 浙江中控技术股份有限公司 | A kind of multi channel signals switching circuit |
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2009
- 2009-07-02 CN CN2009200475541U patent/CN201449411U/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102650854A (en) * | 2012-04-23 | 2012-08-29 | 广州市新锘威智能科技有限公司 | Input/output passage multiplexing intelligent controller |
| CN102680910A (en) * | 2012-05-15 | 2012-09-19 | 华为技术有限公司 | Supply current detection method and circuit |
| CN102680910B (en) * | 2012-05-15 | 2015-07-22 | 华为技术有限公司 | Supply current detection method and circuit |
| CN102967749A (en) * | 2012-11-15 | 2013-03-13 | 无锡中亚工具厂 | Current sampler with amplifying circuit |
| CN102944736A (en) * | 2012-11-22 | 2013-02-27 | 江苏大为科技股份有限公司 | Circuit for detecting wide-range, high-precision and multichannel currents based on optical couplings |
| CN103134975B (en) * | 2013-02-04 | 2016-03-30 | 昆山尼赛拉电子器材有限公司 | Simple multi-channel current tester |
| CN103134975A (en) * | 2013-02-04 | 2013-06-05 | 昆山尼赛拉电子器材有限公司 | Simple multi-channel current tester |
| CN103714025A (en) * | 2013-12-31 | 2014-04-09 | 厦门市美亚柏科信息股份有限公司 | Interface control equipment, data acquisition system and equipment connection control method |
| CN104269041B (en) * | 2014-08-29 | 2017-05-31 | 中国运载火箭技术研究院 | A kind of high code rate data acquiring and transmission system based on star topology framework |
| CN104269041A (en) * | 2014-08-29 | 2015-01-07 | 中国运载火箭技术研究院 | High bit rate data acquisition and transmission system based on star topology framework |
| CN106950034A (en) * | 2016-01-07 | 2017-07-14 | 中兴通讯股份有限公司 | Light source state detecting system and method |
| CN105911313A (en) * | 2016-04-26 | 2016-08-31 | 国网河南省电力公司商丘供电公司 | Electric isolation switch terminal bar test sensor |
| CN106160727B (en) * | 2016-06-22 | 2018-12-11 | 青岛海信日立空调***有限公司 | A kind of isolation circuit and isolation circuit control method |
| CN106160727A (en) * | 2016-06-22 | 2016-11-23 | 青岛海信日立空调***有限公司 | A kind of isolation circuit and isolation circuit control method |
| CN106405187A (en) * | 2016-08-16 | 2017-02-15 | 江苏东方航天校准检测有限公司 | Adaptive controllable air resistor |
| CN106949675A (en) * | 2017-04-05 | 2017-07-14 | 珠海格力电器股份有限公司 | A kind of electronic expansion valve controls signal supervisory instrument |
| CN107834977A (en) * | 2017-11-23 | 2018-03-23 | 湖南红太阳新能源科技有限公司 | A kind of photovoltaic module intelligent wiring box and its control method |
| CN108180939A (en) * | 2017-12-26 | 2018-06-19 | 中国航发四川燃气涡轮研究院 | A kind of multifunctional data acquisition card and measuring method |
| CN108180939B (en) * | 2017-12-26 | 2020-09-22 | 中国航发四川燃气涡轮研究院 | Multifunctional data acquisition card and measuring method |
| CN109240174A (en) * | 2018-10-30 | 2019-01-18 | 南宁学院 | A kind of optional control system of multiplexer (MUX |
| CN109342574A (en) * | 2018-12-03 | 2019-02-15 | 中国海洋大学 | A kind of sound emission multichannel fast switching system and switching method |
| CN109342574B (en) * | 2018-12-03 | 2024-02-06 | 中国海洋大学 | Acoustic emission multichannel rapid switching system and switching method |
| CN109708691A (en) * | 2018-12-07 | 2019-05-03 | 岭东核电有限公司 | A kind of multichannel temperature and ess-strain on-line measurement integrated system and method |
| CN110376947A (en) * | 2019-07-26 | 2019-10-25 | 浙江中控技术股份有限公司 | A kind of multi channel signals switching circuit |
| CN110376947B (en) * | 2019-07-26 | 2021-06-22 | 浙江中控技术股份有限公司 | Multichannel signal switching circuit |
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