CN209728041U - Narrow confusion region acquisition device suitable for onboard system - Google Patents
Narrow confusion region acquisition device suitable for onboard system Download PDFInfo
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- CN209728041U CN209728041U CN201822151379.2U CN201822151379U CN209728041U CN 209728041 U CN209728041 U CN 209728041U CN 201822151379 U CN201822151379 U CN 201822151379U CN 209728041 U CN209728041 U CN 209728041U
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Abstract
The utility model relates to a kind of narrow confusion region acquisition devices 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 utility model realizes the detection to Acquisition Circuit while guaranteeing narrow confusion region.
Description
Technical field
The utility model relates to DC voltage acquisition technique fields, more particularly, to a kind of narrow mould suitable for onboard system
Paste area's acquisition device.
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.
Utility model content
The purpose of this utility model is exactly to provide a kind of suitable for vehicle to overcome the problems of the above-mentioned prior art
The narrow confusion region acquisition device of loading system.
The purpose of this utility model can be achieved through the following technical solutions:
A kind of narrow confusion region acquisition device suitable for onboard system in, comprising: test power module, relay module,
The output end of comparator module and optical coupling module, 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, and the output end of the relay module is connected to comparator mould
The inverting input terminal of block, the output end of the comparator module are connected to the input terminal of the optical coupling module.
Preferably, the output end of the relay module is connected to comparator module after divider resistance and filter capacitor
Inverting input terminal.
Preferably, the test power module is Switching Power Supply.
Preferably, the relay module is electromagnetic relay.
Preferably, the positive input of the comparator module is connect by first resistor with power supply VCC.
Preferably, the first resistor is 4.7k Ω.
Preferably, the positive input of the comparator module is grounded by second resistance.
Preferably, the second resistance is 3.48k Ω.
Preferably, the divider resistance is 20k Ω, and one end is connect with relay module, the other end and comparator module
Inverting input terminal connection.
Preferably, the filter capacitor is 10nF, and one terminates at the inverting input terminal of divider resistance and comparator module
Between, other end ground connection.
Compared with prior art, the utility model realizes the function to Acquisition Circuit while ensuring that confusion region is sufficiently narrow
Can self-test, 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 utility model embodiment.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
It clearly and completely describes, it is clear that described embodiment is a part of the embodiment of the utility model, rather than is all implemented
Example.Based on the embodiments of the present invention, those of ordinary skill in the art institute without making creative work
The every other embodiment obtained all should belong to the range of the utility model protection.
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.
Above description is only a specific implementation of the present invention, but the protection scope of the utility model is not limited to
In this, anyone skilled in the art within the technical scope disclosed by the utility model, can be readily occurred in various
Equivalent modifications or substitutions, these modifications or substitutions should be covered within the scope of the utility model.Therefore, this is practical
Novel protection scope should be subject to the protection scope in claims.
Claims (10)
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
Second contact of one contact, the test power module is connected to external input, and the output end of the relay module is connected to
The inverting input terminal of comparator module, the output end of the comparator module are connected to the input terminal of the 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
The output end of relay module is connected to the inverting input terminal of comparator module after divider resistance and filter capacitor.
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.
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.
5. a kind of narrow confusion region acquisition device suitable for onboard system according to claim 1, which is characterized in that described
The positive input of comparator module is connect by first resistor with power supply VCC.
6. a kind of narrow confusion region acquisition device suitable for onboard system according to claim 5, which is characterized in that described
First resistor is 4.7k Ω.
7. a kind of narrow confusion region acquisition device suitable for onboard system according to claim 1, which is characterized in that described
The positive input of comparator module is grounded by second resistance.
8. a kind of narrow confusion region acquisition device suitable for onboard system according to claim 7, which is characterized in that described
Second resistance is 3.48k Ω.
9. a kind of narrow confusion region acquisition device suitable for onboard system according to claim 2, which is characterized in that 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.
10. a kind of narrow confusion region acquisition device suitable for onboard system according to claim 2, which is characterized in that institute
Stating filter capacitor is 10nF, and one terminates between divider resistance and the inverting input terminal of comparator module, other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822151379.2U CN209728041U (en) | 2018-12-20 | 2018-12-20 | Narrow confusion region acquisition device suitable for onboard system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822151379.2U CN209728041U (en) | 2018-12-20 | 2018-12-20 | Narrow confusion region acquisition device suitable for onboard system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109581039A (en) * | 2018-12-20 | 2019-04-05 | 卡斯柯信号有限公司 | A kind of narrow confusion region acquisition device and method suitable for onboard system |
| CN111208342A (en) * | 2020-01-15 | 2020-05-29 | 上海船舶电子设备研究所(中国船舶重工集团公司第七二六研究所) | Line fault self-diagnosis method and system suitable for fire alarm control |
-
2018
- 2018-12-20 CN CN201822151379.2U patent/CN209728041U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109581039A (en) * | 2018-12-20 | 2019-04-05 | 卡斯柯信号有限公司 | A kind of narrow confusion region acquisition device and method suitable for onboard system |
| CN111208342A (en) * | 2020-01-15 | 2020-05-29 | 上海船舶电子设备研究所(中国船舶重工集团公司第七二六研究所) | Line fault self-diagnosis method and system suitable for fire alarm control |
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