CN205691645U - A kind of signal detection system - Google Patents
A kind of signal detection system Download PDFInfo
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- CN205691645U CN205691645U CN201620497210.0U CN201620497210U CN205691645U CN 205691645 U CN205691645 U CN 205691645U CN 201620497210 U CN201620497210 U CN 201620497210U CN 205691645 U CN205691645 U CN 205691645U
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Abstract
The utility model discloses a kind of signal detection system, including: described signal acquisition module, gather the signal of pending detection；Described signal measurement module, electrically connects with described signal acquisition module, measures described signal acquisition module and gathers the size of signal；Described signal-data processing module, electrically connects with described signal measurement module, and the signal measured according to described signal measurement module is adjusted processing, control signal detecting system properly functioning.This utility model make tested voltage be maintained at one reasonably in the range of, thus improve the precision of measured value and the scope of measurement.
Description
Technical field
This utility model relates to industrial detection control field, espespecially a kind of signal detection system.
Background technology
It is the most important thing at industrial detection control field for the detection of signal, particularly in fire preventing signal detection side
Face；This analogue signal, when measuring temperature, electric current, resistance value, humidity etc., is generally converted to by current most equipment
Magnitude of voltage, then via AD conversion become controller process digital signal, then have controller calculate corresponding temperature, electric current,
Resistance value.Generally, AD conversion chip has minimum transition voltage or guarantee conversion in certain voltage range
Precision.
At present, most equipment, during converting analog signals into voltage signal, use single divider resistance, as
Really analog signal range fluctuation is relatively big, is likely to result in the voltage Vo changed not in the optimum voltage scope of AD conversion, thus makes
Become signal to measure or certainty of measurement is relatively low.
Based on problem above, this practical information provides a kind of new solution.
Utility model content
The purpose of this utility model is to provide a kind of signal detection system, it is therefore an objective to improves accuracy of detection, makes inspection further
Examining system is more flexible and changeable.
The technical scheme that this utility model provides is as follows:
A kind of signal detection system, including:
Signal acquisition module, gathers the signal of pending detection；
Signal measurement module, electrically connects with described signal acquisition module, measures described signal acquisition module and gathers signal
Size；
Signal-data processing module, electrically connects with described signal measurement module, described signal acquisition module, respectively according to institute
State the signal that signal measurement module measures to be adjusted processing, control signal detecting system properly functioning.
It is further preferred that
Described signal measurement module also includes: current mode measurement module, and/or voltage-type measurement module.
It is further preferred that
Described current mode measurement module includes 4 electric current gating circuits；
Each described electric current gating circuit is made up of 1 switching tube, 1 relay, 1 sampling resistor.
It is further preferred that
In described electric current gating circuit:
The base stage of described switching tube electrically connects with described signal-data processing module；
Described switching tube emitter stage electrically connects with public terminal GND；
One end that the colelctor electrode of described switching tube is changed with the contact of described relay electrically connects；
The contact conversion other end of described relay electrically connects with supply voltage；
The normally opened contact two ends of described relay electrically connect side by side with described sampling resistor two ends, and form the first common port
With the second common port.
It is further preferred that
In 4 described electric current gating circuits:
The electric current output that first common port of described first electric current gating circuit gathers with described signal acquisition module respectively
End, the first detection signal electrical connection；
Second common port of described first electric current gating circuit is electrically connected with described second electric current gating circuit the first common port
Connect；
Second common port of described second electric current gating circuit is electrically connected with described 3rd electric current gating circuit the first common port
Connect；
Second common port of described 3rd electric current gating circuit is electrically connected with described 4th electric current gating circuit the first common port
Connect；
Second common port of described 4th electric current gating circuit electrically connects with described public terminal GND.
It is further preferred that
Described voltage-type measurement module includes 4 voltage gating circuits；
Each described voltage gating circuit is made up of 1 switching tube, 1 relay, 1 sampling resistor.
It is further preferred that
In described voltage gating circuit:
The base stage of described switching tube electrically connects with described signal-data processing module；
Described switching tube emitter stage electrically connects with public terminal GND；
One end that the colelctor electrode of described switching tube is changed with the contact of described relay electrically connects；
The contact conversion other end of described relay electrically connects with supply voltage；
The normally opened contact two ends of described relay electrically connect side by side with described sampling resistor two ends, and form the first common port
With the second common port.
It is further preferred that include:
In 4 described voltage gating circuits:
The detection resistance that first common port of described first voltage gating circuit gathers with described signal acquisition module respectively
One end, described second detection signal electrical connection；
The other end of described detection resistance electrically connects with described supply voltage；
Second common port of described first voltage gating circuit is electrically connected with described second voltage gating circuit the first common port
Connect；
Second common port of described second voltage gating circuit is electrically connected with described tertiary voltage gating circuit the first common port
Connect；
Second common port of described tertiary voltage gating circuit is electrically connected with described 4th voltage gating circuit the first common port
Connect；
Second common port of described 4th voltage gating circuit electrically connects with described public terminal GND.
It is further preferred that also include:
The signal filtering module electrically connected with described signal measurement module；
The signal protection module electrically connected with described signal filtering module；
Described signal filtering module is made up of 3 amplifiers；
Described signal protection module is made up of photoisolator.
It is further preferred that
The detection signal of described signal protection module output further with the digital processing of described signal-data processing module
Chip electrically connects；Described digital processing chip model is stm32f103.
Technique effect
A kind of signal detection system provided by this utility model, it is possible to bring at least one beneficial effect following:
1, may be caused by divider resistance in signal detecting method single for prior art in this utility model cannot survey
Amount or the poor problem of certainty of measurement, to its further improvement.The utility model proposes one and can change dividing potential drop electricity online
The cascade sampling method of resistance, seals in the divider resistance of multiple different resistance in bleeder circuit, and at each sampling resistor two ends
It is incorporated to the contact of relay.When voltage is acquired by single-chip microcomputer or controller, according to the magnitude of voltage gathered, select to continue
Electrical equipment whether adhesive, whether corresponding divider resistance accesses；By the access of different divider resistances, tested voltage is made to be maintained at one
Individual reasonably in the range of, thus improve the precision of measured value and the scope of measurement.
2, improvement project of the present utility model can solve leakage current value less cause cannot measure without certainty of measurement
Low problem, can improve cable insulation value less relatively greatly time certainty of measurement.
Accompanying drawing explanation
Below by the way of the most understandable, accompanying drawings preferred implementation, to a kind of signal detection system
Above-mentioned characteristic, technical characteristic, advantage and implementation thereof are further described.
Fig. 1 is the first embodiment figure of a kind of signal detection system of this utility model；
Fig. 2 is the second enforcement illustration of a kind of signal detection system of this utility model；
Fig. 3 is the 3rd enforcement illustration of a kind of signal detection system of this utility model；
Fig. 4 is the 4th enforcement illustration of a kind of signal detection system of this utility model；
Fig. 5 is the 5th enforcement illustration of a kind of signal detection system of this utility model；
Fig. 6 is the current detecting figure of a kind of signal detection system of this utility model；
Fig. 7 is the resistance detection figure of a kind of signal detection system of this utility model.
Detailed description of the invention
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, accompanying drawing will be compareed below
Detailed description of the invention of the present utility model is described.It should be evident that the accompanying drawing in describing below is only of the present utility model one
A little embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to according to these
Accompanying drawing obtains other accompanying drawing, and obtains other embodiment.
For making simplified form, only schematically show the part relevant to this utility model in each figure, they are also
Do not represent its practical structures as product.It addition, so that simplified form readily appreciates, have in some figure identical structure or
The parts of function, only symbolically depict one of them, or have only marked one of them.In this article, " one " no
Only represent " only this ", it is also possible to represent the situation of " more than one ".
The improvement of detecting system of the present utility model is applicable to be converted to various analogue signals voltage signal, and to this electricity
The data handling system that pressure signal is AD converted, such as electrical fire detecting system is to temperature, leakage current, cable insulation against ground
The measurement of value.
Embodiment one:
This utility model provides a kind of signal detection system, with reference to shown in Fig. 1；Signal acquisition module 1, gathers pending
The signal of detection；The detection signal gathered is transferred to the signal measurement module 2 being electrically connected, measures signal acquisition module 1
Gather the size of signal；This signal value is sent to the digital processing chip in processing data information module 5, and then regulation signal
The matching relationship of the sampling resistor in measurement module.
Embodiment two:
This utility model provides a kind of signal detection system, with reference to shown in Fig. 2；Signal acquisition module 1, gathers pending
The signal of detection；The detection signal gathered is transferred to the signal measurement module 2 being electrically connected, measures signal acquisition module 1
Gather the size of signal；By detection signal through the signal filtering module 3 being made up of amplifier and resistance, electric capacity；Further
Filtering interference signals, is stablized in the range of default, by this detection signal again by being formed letter by photoisolator
Number protection module 4 after output to the digital processing chip model in signal-data processing module 5 be stm32f103 set pipe
Foot electrically connects；Digit chip is according to the coupling of the sampling resistor in the information of detected signal value, and then regulation signal measurement module
Relation；The shutoff of the most a certain way switch in the gating circuit of control signal measurement module 2 further.
Embodiment three:
This utility model also provides for the circuitry for signal measurement of measurement module in a kind of signal detection system, in the present embodiment
For current mode measurement module；With reference to shown in Fig. 3；Current mode measurement module includes 4 electric current gating circuits in the present embodiment；Root
Can arrange multiple gating circuit according to demand in engineering, resistance value can also carry out adaptive adjustment.Each described electric current selects
Circuit passband is made up of 1 switching tube, 1 relay, 1 sampling resistor.
The E end of switching tube Q1 electrically connects with public terminal GND；The C end of Q1 is electrically connected with one end of the contact conversion of relay K 1
Connect；The contact conversion other end of K1 electrically connects with supply voltage VCC；The normally opened contact two ends of K1 and R1 also connect.After parallel connection one
End electrically connects with collection current signal I1 respectively, the signal that input gathers；With detection signal VO, V after being adjustedOOutput is extremely
Filter circuit as shown in Figure 5；4 electric current gating circuit series connection of the offer in the present embodiment；
Its operation principle is as follows:
In Fig. 3, current signal I1, I2 can access the secondary side of current transformer, it is also possible to access the biography of output 4-20mA
Sensor.Electric current is converted to sampled voltage Vo through voltage collection circuit, by AD conversion voltage as a example by (0.5V-2V), works as collection
When the Vo voltage arrived is more than 2V, owing to input current signal I1 is constant, 4 resistance all seal in, all disconnections of relay
State, digital control chip (single-chip microcomputer stm32f103) is by controlling the B end of audion Q4 so that it is conducting, controls relay K 4
Adhesive, makes sampling resistor R4 can not access sample circuit, and detection sampled voltage Vo, if still greater than 2V, then controls relay again
K3, K4 adhesive, then detect Vo, if still greater than 2V, then attracting electric relay K2, K3, K4.Detect Vo again, if still greater than 2V, then adhesive
Relay K 1, K2, K3, K4；If detection voltage too small, then increase gating circuit, and/or regulation sampling resistor R1, R2,
The resistance size of R3, R4.
Embodiment four:
This utility model also provides for the circuitry for signal measurement of measurement module in a kind of signal detection system, in the present embodiment
For voltage-type measurement module；With reference to shown in Fig. 4；Voltage-type measurement module includes 4 voltage gating circuits in the present embodiment；Root
Can arrange multiple gating circuit according to demand in engineering, resistance value can also carry out adaptive adjustment.Each described voltage selects
Circuit passband is made up of 1 switching tube, 1 relay, 1 sampling resistor.
In the diagram, the E end of switching tube Q1 electrically connects with public terminal GND；The contact conversion of the C end of Q1 and relay K 1
One end electrically connects；The contact conversion other end of K1 electrically connects with supply voltage VCC；The normally opened contact two ends of K1 and R1 also connect.And
One end after connection electrically connects with detection resistance RX respectively, with detection signal VOElectrical connection, the V after being adjustedOOutput is to such as Fig. 5
Shown filter circuit；4 voltage gating circuit series connection of the offer in the present embodiment.
Its operation principle is as follows:
As shown in Figure 4, in figure, measured resistance RX is the insulation against ground value of cable.Resistance is converted to sampling through bleeder circuit
Voltage Vo, by AD conversion voltage as a example by (0.5V-2V), when the Vo voltage collected is less than 0.5V, same with same enforcement three
The mode of sample controls relay K 4 adhesive, makes sampling resistor R4 can not access sample circuit, again detection sampled voltage Vo, if still
Less than 0.5V, then control relay K 3, K4 adhesive, then detect Vo, if still less than 0.5V, then attracting electric relay K2, K3, K4.Again
Detection Vo, if still less than 0.5V, then attracting electric relay K1, K2, K3, K4.
Otherwise, when at a time, when the voltage Vo of collection is more than 2V, then controls corresponding relay and disconnect, accessing should
The sampling resistor of level, until Vo is in suitable scope.Need according to actual measurement object calculate sampling resistor R1 at different levels,
The resistance of R2, R3, R4.
Embodiment five:
Combine in the present embodiment shown in Fig. 3, Fig. 4, Fig. 5；
Combine shown in Fig. 2 when testing circuit signal, such as embodiment three；(voltage-type) reference example during as detected resistance
Four；
Gather the sampled voltage Vo, Vo after turning through two-stage active filter circuit as it is shown in figure 5, again through light-coupled isolation
After, the voltage AD1, AD1 that obtain AD sampling access the AD conversion pin of stm32f103, through the AD conversion within stm32f103
Analog voltage is converted to the process digital signal of single-chip microcomputer by device, obtains the value of collected voltage Vo through program conversion.Work as Vo
Value not when 0.5-2V scope, program controls the low and high level of pin input pin as required and carrys out the switch of operational relay,
And then determine the access of different sampling resistors.
The bleeder circuit improved can improve scope and the precision of measurement.Such as: when the electric current of measurement current transform er,
Being 10 Ω by R in the current mode measuring circuit of Fig. 6, the minimum voltage of AD conversion is that 25mv, Fig. 6 can only measure the electricity more than 25mA
Stream signal, cannot measure when electric current is less than 25mA, and Fig. 3, when voltage is less than 25ma, R2, R3 can be accessed, make sampling electricity
It is pressed onto and reaches more than 25mV, it is possible to obtain accurate current value.
The bleeder circuit improved can improve scope and the precision of measurement.Such as: when measuring resistance, with reference to the electricity of Fig. 7
R is 1k Ω by flow pattern measuring circuit, the minimum voltage of AD conversion be 25mv, VCC be 5V, the resistance in Fig. 7 is 1K, works as outside
Measured resistance value more than 200K time, 1k*5V/ (1k+200k)=24.8mV, resistance value can not be accurately measured, and improves
After circuit diagram 4 still can accurately measure.
It should be noted that, above-described embodiment all can independent assortment as required.The above is only of the present utility model
Preferred implementation, it is noted that for those skilled in the art, without departing from this utility model principle
On the premise of, it is also possible to making some improvements and modifications, these improvements and modifications also should be regarded as protection domain of the present utility model.
Claims (10)
1. a signal detection system, it is characterised in that including:
Signal acquisition module, gathers the signal of pending detection；
Signal measurement module, electrically connects with described signal acquisition module, measures described signal acquisition module and gathers the size of signal；
Signal-data processing module, electrically connects with described signal measurement module, described signal acquisition module, respectively according to described letter
The signal that number measurement module is measured is adjusted processing, control signal detecting system properly functioning.
Signal detection system the most according to claim 1, it is characterised in that
Described signal measurement module also includes: current mode measurement module, and/or voltage-type measurement module.
Signal detection system the most according to claim 2, it is characterised in that
Described current mode measurement module includes 4 electric current gating circuits；
Each described electric current gating circuit is made up of 1 switching tube, 1 relay, 1 sampling resistor.
Signal detection system the most according to claim 3, it is characterised in that
In described electric current gating circuit:
The base stage of described switching tube electrically connects with described signal-data processing module；
Described switching tube emitter stage electrically connects with public terminal GND；
One end that the colelctor electrode of described switching tube is changed with the contact of described relay electrically connects；
The contact conversion other end of described relay electrically connects with supply voltage；
The normally opened contact two ends of described relay electrically connect side by side with described sampling resistor two ends, and form the first common port and
Two common ports.
Signal detection system the most according to claim 4, it is characterised in that including:
In 4 described electric current gating circuits:
Current output terminal that first common port of the first electric current gating circuit gathers with described signal acquisition module respectively, the first inspection
Survey signal electrically connects；
Second common port of described first electric current gating circuit and the electrical connection of second electric current gating circuit the first common port；
Second common port of described second electric current gating circuit and the electrical connection of the 3rd electric current gating circuit the first common port；
Second common port of described 3rd electric current gating circuit and the electrical connection of the 4th electric current gating circuit the first common port；
Second common port of described 4th electric current gating circuit electrically connects with described public terminal GND.
Signal detection system the most according to claim 2, it is characterised in that
Described voltage-type measurement module includes 4 voltage gating circuits；
Each described voltage gating circuit is made up of 1 switching tube, 1 relay, 1 sampling resistor.
Signal detection system the most according to claim 6, it is characterised in that
In described voltage gating circuit:
The base stage of described switching tube electrically connects with described signal-data processing module；
Described switching tube emitter stage electrically connects with public terminal GND；
One end that the colelctor electrode of described switching tube is changed with the contact of described relay electrically connects；
The contact conversion other end of described relay electrically connects with supply voltage；
The normally opened contact two ends of described relay electrically connect side by side with described sampling resistor two ends, and form the first common port and
Two common ports.
Signal detection system the most according to claim 7, it is characterised in that including:
In 4 described voltage gating circuits:
First common port of the first voltage gating circuit respectively with described signal acquisition module detection one end of resistance, second inspection
Survey signal electrically connects；
The other end of described detection resistance electrically connects with described supply voltage；
Second common port of the first voltage gating circuit and the electrical connection of second voltage gating circuit the first common port；
Second common port of described second voltage gating circuit electrically connects with tertiary voltage gating circuit the first common port；
Second common port of described tertiary voltage gating circuit and the electrical connection of the 4th voltage gating circuit the first common port；
Second common port of described 4th voltage gating circuit electrically connects with described public terminal GND.
9. according to the arbitrary described signal detection system of claim 1-8, it is characterised in that also include:
The signal filtering module electrically connected with described signal measurement module；
The signal protection module electrically connected with described signal filtering module；
Described signal filtering module is made up of 3 amplifiers；
Described signal protection module is made up of photoisolator.
Signal detection system the most according to claim 9, it is characterised in that
The detection signal of described signal protection module output further with the digital processing chip of described signal-data processing module
Electrical connection；
Described digital processing chip model is stm32f103.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620497210.0U CN205691645U (en) | 2016-05-26 | 2016-05-26 | A kind of signal detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620497210.0U CN205691645U (en) | 2016-05-26 | 2016-05-26 | A kind of signal detection system |
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| Publication Number | Publication Date |
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| CN205691645U true CN205691645U (en) | 2016-11-16 |
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| CN201620497210.0U Active CN205691645U (en) | 2016-05-26 | 2016-05-26 | A kind of signal detection system |
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| CN (1) | CN205691645U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109245041A (en) * | 2018-10-26 | 2019-01-18 | 兖矿东华重工有限公司 | A kind of earth leakage protective device |
| WO2020155314A1 (en) * | 2019-02-01 | 2020-08-06 | 深圳市金准生物医学工程有限公司 | Optical sampling module having balanced sampling width and precision, and immunofluorescence assay equipment |
-
2016
- 2016-05-26 CN CN201620497210.0U patent/CN205691645U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109245041A (en) * | 2018-10-26 | 2019-01-18 | 兖矿东华重工有限公司 | A kind of earth leakage protective device |
| CN109245041B (en) * | 2018-10-26 | 2024-02-02 | 兖矿东华重工有限公司 | Leakage protection device |
| WO2020155314A1 (en) * | 2019-02-01 | 2020-08-06 | 深圳市金准生物医学工程有限公司 | Optical sampling module having balanced sampling width and precision, and immunofluorescence assay equipment |
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