CN109581039A - A kind of narrow confusion region acquisition device and method suitable for onboard system - Google Patents
A kind of narrow confusion region acquisition device and method suitable for onboard system Download PDFInfo
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- CN109581039A CN109581039A CN201811567567.1A CN201811567567A CN109581039A CN 109581039 A CN109581039 A CN 109581039A CN 201811567567 A CN201811567567 A CN 201811567567A CN 109581039 A CN109581039 A CN 109581039A
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000012360 testing method Methods 0.000 claims abstract description 35
- 230000008878 coupling Effects 0.000 claims abstract description 14
- 238000010168 coupling process Methods 0.000 claims abstract description 14
- 238000005859 coupling reaction Methods 0.000 claims abstract description 14
- 230000003287 optical effect Effects 0.000 claims abstract description 14
- 239000003990 capacitor Substances 0.000 claims abstract description 5
- 230000009977 dual effect Effects 0.000 abstract description 7
- 238000001514 detection method Methods 0.000 abstract description 6
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- BYACHAOCSIPLCM-UHFFFAOYSA-N 2-[2-[bis(2-hydroxyethyl)amino]ethyl-(2-hydroxyethyl)amino]ethanol Chemical compound OCCN(CCO)CCN(CCO)CCO BYACHAOCSIPLCM-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
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- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
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Abstract
The present invention relates to a kind of narrow confusion region acquisition devices and method suitable for onboard system, the acquisition device includes test power module, relay module, comparator module and optical coupling module, the output end of the test power module is connected to the first contact of the relay module, second contact of the test power module is connected to external input, the output end of the relay module is connected to the inverting input terminal of comparator module after divider resistance and filter capacitor, and the output end of the comparator module is connected to the input terminal of the optical coupling module.Compared with prior art, the present invention ensure that the acquisition precision of Acquisition Circuit by dual threshold setting and dual threshold detection mode, Acquisition Circuit self-checking function is also added with timely discovery circuit failure simultaneously, i.e., the detection to Acquisition Circuit is realized while guaranteeing narrow confusion region.
Description
Technical field
The present invention relates to DC voltage acquisition technique fields, more particularly, to a kind of narrow confusion region suitable for onboard system
Acquisition device and method.
Background technique
It in track transportation industry, needs that mobile unit signal is acquired and is exported, is to acquire DC voltage 50V
Example should collect " low " level signal when input voltage is less than 30V according to standard regulation, when input voltage is greater than 35V
"high" level signal should be collected.Traditional acquisition device is acquired by current limliting, optocoupler transfer ratio mode, however existing
This technology has the following problems:
1, due to the discreteness of device, this acquisition mode is caused to there is very big error to the judgement of "high" " low " level,
So that fuzzy interval is more than 20%；
2, lack dual threshold (low level and high level judgment threshold) detection function, cause circuit acquisition be " low " or
It is unable to ensure whether external collected input is genuine " low " or "high" when "high", because in practical applications may be due to electricity
Road failure causes acquisition to get the wrong sow by the ear, such as causes threshold value to be drifted about after the electronic component in circuit fails, and adopts
This failure can not be detected in acquisition means operational process, and it is wrong to will result in acquisition output result.
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide one kind to be suitable for vehicle-mounted system
The narrow confusion region acquisition device and method of system are theed improvement is that through dual threshold setting and dual threshold detection mode and are reduced
Fuzzy interval range, while realizing Acquisition Circuit threshold decision function self-test.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of narrow confusion region acquisition device suitable for onboard system, comprising: test power module, relay module, ratio
Compared with device module and optical coupling module, the output end of the test power module is connected to the first contact of the relay module, institute
The second contact for stating test power module is connected to external input, and the output end of the relay module passes through divider resistance and filter
The inverting input terminal of comparator module is connected to after wave capacitor, the output end of the comparator module is connected to the optical coupling module
Input terminal,.
Preferably, the test power module, for exporting self-checking voltage；
The relay module, the input source for switching Acquisition Circuit are output or the outside for testing power module
True input；
The comparator module, for accurately judging " low " or the "high" of Acquisition Circuit input signal；
The optical coupling module, for realizing being isolated for Acquisition Circuit and external circuit, and by the result of comparator module every
From output to external circuit.
Preferably, the test power module is Switching Power Supply, adjusts its output voltage by adjusting divider resistance.
Preferably, the relay module is electromagnetic relay, is cut whether obtaining electric by controlling relay Inside coil
Change relay contact location status.
Preferably, the comparator module and optical coupling module constitute Acquisition Circuit.
A kind of narrow confusion region acquisition method suitable for onboard system, comprising:
Step 1, it is initialized after acquisition device starting；
Step 2, start acquisition device self-checking function；
Step 3, setting the first contact of relay module is connected, and relay module work is in " T " state, so that test power supply
The output of module accesses Acquisition Circuit；
Step 4, the divider resistance of setting test power module, so that the output voltage values of test power module are low threshold
Value；
Step 5, whether the acquisition state for judging acquisition device output is " low ", if so, 6 are thened follow the steps, if it is not, then
Execute exception handles；
Step 6, the divider resistance of setting test power module, so that the output voltage values of test power module are high threshold
Value；
Step 7, whether the acquisition state for judging acquisition device output is "high", if so, 8 are thened follow the steps, if it is not, then
Execute exception handles；
Step 8, it is judged as that Acquisition Circuit self-test passes through, setting the second contact of relay module is connected, relay module work
Make in " I " state, so that external input signal accesses Acquisition Circuit；
Step 9, it executes acquisition device normal cycle and acquires function.
Compared with prior art, the present invention realized while ensuring that confusion region is sufficiently narrow to the function of Acquisition Circuit from
Inspection, specifically have it is following the utility model has the advantages that
1, judgement is compared to acquisition signal using comparator, the effective constriction confusion region of Acquisition Circuit；
2, using dual threshold setting and dual threshold detection mode, so that acquisition fuzzy interval range is reduced and is adopted less than 5%
Collect error in judgement, substantially increases acquisition precision；
3, function self-test periodically is carried out to Acquisition Circuit, facilitates timely identification circuit failure, also ensure acquisition output
As a result reliability.
Detailed description of the invention
Fig. 1 is the circuit structure diagram of the narrow confusion region acquisition device suitable for onboard system of the embodiment of the present invention；
Fig. 2 is the narrow confusion region acquisition method flow chart suitable for onboard system of the embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiment is a part of the embodiments of the present invention, rather than whole embodiments.Based on this hair
Embodiment in bright, those of ordinary skill in the art's every other reality obtained without making creative work
Example is applied, all should belong to the scope of protection of the invention.
Embodiment 1
As shown in Figure 1, a kind of circuit structure of the narrow confusion region acquisition device suitable for onboard system, including test power supply
Module a, relay module b, comparator module c and optical coupling module d, comparator module c and optical coupling module d constitute Acquisition Circuit.
The output end of test power module a is connected to the first contact " T " of relay module b, the second contact " I " of relay module b
It is connected to external input, the output end of relay module b is connected to comparator module c's after divider resistance and filter capacitor
Inverting input terminal, the output end of comparator module c are connected to the input terminal of optical coupling module d.
The positive input of the comparator module is connect by first resistor with power supply VCC.The first resistor is
4.7kΩ.The positive input of the comparator module is grounded by second resistance.The second resistance is 3.48k Ω.It is described
Divider resistance is 20k Ω, and one end is connect with relay module, the inverting input terminal connection of the other end and comparator module.Institute
Stating filter capacitor is 10nF, and one terminates between divider resistance and the inverting input terminal of comparator module, other end ground connection.
Wherein, test power module a is switch power module, is made of chip LT3958 and peripheral circuit, passes through tune
The partial pressure resistance ratio of LT3958 is saved to adjust the output voltage of LT3958, the output voltage of LT3958 is used for detection comparator mould
The ability of block c judgement " low " level and "high" level；
Relay module b is electromagnetic relay, by control electromagnetic relay coil power supply whether come switch electromagnetism after
Appliance contact on state:
When electromagnetic relay contact " T " conducting, the output voltage of power module a is tested by access comparator module c, i.e.,
Execute acquisition device self-checking function；
When electromagnetic relay contact " I " conducting, external input signal accesses comparator module c, i.e. execution acquisition device
Normal acquisition function；
The voltage value of the non-inverting input terminal of comparator module c model TLV2374, TLV2374 is U+=15V/ (4.7k+
The anti-phase input terminal voltage value of 3.48k) × 3.48k=6.38V (± 0.13V), TLV2374 are U-=Vin/(20k+5k)×5k
=0.2 × Vin, wherein VinFor the output valve of relay module b；
Optical coupling module d model TCMT4100, for realizing being isolated for Acquisition Circuit and external circuit, and by comparator mould
The comparison result isolation output of block c is to external circuit.
Embodiment 2
As shown in Fig. 2, a kind of narrow confusion region acquisition method flow chart suitable for onboard system, comprising the following steps:
Step 1, it is initialized after acquisition device starting；
Step 2, start acquisition device self-checking function；
Step 3, setting the first contact of relay module is connected, and relay module work is in " T " state, so that test power supply
The output of module accesses Acquisition Circuit；
Step 4, the divider resistance value of LT3958 in power module is tested in setting, so that the output voltage of test power module
Value is Low threshold 30.5V；
Step 5, whether the acquisition state for judging Acquisition Circuit output is " low ", if so, 6 are thened follow the steps, if it is not, then
Execute exception handles；
Step 6, the divider resistance value of LT3958 in power module is tested in setting, so that the output voltage of test power module
Value is high threshold 33V；
Step 7, whether the acquisition state for judging Acquisition Circuit output is "high", if so, 8 are thened follow the steps, if it is not, then
Execute exception handles；
Step 8, it is judged as that Acquisition Circuit self-test passes through, setting the second contact of relay is connected, and relay works in " I " shape
State, so that external input signal accesses Acquisition Circuit；
Step 9, it executes acquisition device normal cycle and acquires function.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can readily occur in various equivalent modifications or replace
It changes, these modifications or substitutions should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with right
It is required that protection scope subject to.
Claims (6)
1. a kind of narrow confusion region acquisition device suitable for onboard system characterized by comprising test power module, relay
The output end of device module, comparator module and optical coupling module, the test power module is connected to the of the relay module
One contact, the second contact of the test power module are connected to external input, and the output end of the relay module is through excessive
The inverting input terminal of comparator module is connected to after piezoresistance and filter capacitor, the output end of the comparator module is connected to institute
State the input terminal of optical coupling module.
2. a kind of narrow confusion region acquisition device suitable for onboard system according to claim 1, which is characterized in that described
Power module is tested, for exporting self-checking voltage；
The relay module, the input source for switching Acquisition Circuit be test power module output or outside it is true
Input；
The comparator module, for accurately judging " low " or the "high" of Acquisition Circuit input signal；
The optical coupling module for realizing being isolated for Acquisition Circuit and external circuit, and the result of comparator module is isolated defeated
Out to external circuit.
3. a kind of narrow confusion region acquisition device suitable for onboard system according to claim 2, which is characterized in that described
Test power module is Switching Power Supply, adjusts its output voltage by adjusting divider resistance.
4. a kind of narrow confusion region acquisition device suitable for onboard system according to claim 2, which is characterized in that described
Relay module is electromagnetic relay, switches relay contact position shape whether obtaining electric by controlling relay Inside coil
State.
5. a kind of narrow confusion region acquisition device suitable for onboard system according to claim 1, which is characterized in that described
Comparator module and optical coupling module constitute Acquisition Circuit.
6. a kind of narrow confusion region acquisition method suitable for onboard system characterized by comprising
Step 1, it is initialized after acquisition device starting；
Step 2, start acquisition device self-checking function；
Step 3, setting the first contact of relay module is connected, and relay module work is in " T " state, so that test power module
Output access Acquisition Circuit；
Step 4, the divider resistance of setting test power module, so that the output voltage values of test power module are Low threshold；
Step 5, whether the acquisition state for judging acquisition device output is " low ", if so, 6 are thened follow the steps, if it is not, then executing
Exception handles；
Step 6, the divider resistance of setting test power module, so that the output voltage values of test power module are high threshold；
Step 7, whether the acquisition state for judging acquisition device output is "high", if so, 8 are thened follow the steps, if it is not, then executing
Exception handles；
Step 8, it is judged as that Acquisition Circuit self-test passes through, setting the second contact of relay module is connected, and relay module work exists
" I " state, so that external input signal accesses Acquisition Circuit；
Step 9, it executes acquisition device normal cycle and acquires function.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811567567.1A CN109581039A (en) | 2018-12-20 | 2018-12-20 | A kind of narrow confusion region acquisition device and method suitable for onboard system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811567567.1A CN109581039A (en) | 2018-12-20 | 2018-12-20 | A kind of narrow confusion region acquisition device and method suitable for onboard system |
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Family
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| CN202111684U (en) * | 2011-07-11 | 2012-01-11 | 福建农林大学 | Circuit device for realizing level measurement and control by using relay |
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