CN217385612U - Signal acquisition circuit under strong interference track traffic environment - Google Patents
Signal acquisition circuit under strong interference track traffic environment Download PDFInfo
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- CN217385612U CN217385612U CN202220137185.0U CN202220137185U CN217385612U CN 217385612 U CN217385612 U CN 217385612U CN 202220137185 U CN202220137185 U CN 202220137185U CN 217385612 U CN217385612 U CN 217385612U
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- acquisition circuit
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Abstract
The utility model relates to a signal acquisition circuit under strong interference track traffic environment, which comprises a protection part, a filtering part and an isolation part which are connected in sequence, wherein the protection part is used for protecting devices and preventing the devices from being damaged; the filtering part is used for filtering interference signals; the isolation part is used for realizing the unidirectional transmission of signals. The utility model discloses can improve the interference killing feature among the signal transmission process.
Description
Technical Field
The utility model relates to a signal acquisition technical field especially relates to a strong signal acquisition circuit under disturbing track traffic environment.
Background
A platform track running area of the track traffic belongs to a strong electromagnetic interference environment with high voltage and large current. The train and accessory equipment thereof, such as a train door system, a screen door system, an air conditioning system, a wireless communication system, lighting and the like, are intensively arranged in the area, and the equipment is immediately connected or started and stopped at the same time, so that larger surge current and surge voltage are caused. Meanwhile, the distance from the equipment room to the rail running area of the station platform is hundreds of meters, and long-distance parallel cabling further deteriorates the signal transmission environment, so that the signal acquisition circuit in the strong interference rail transit environment is continued.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a strong interference track traffic environment is lower signal acquisition circuit is provided, the interference killing feature among the signal transmission process can be improved.
The utility model provides a technical scheme that its technical problem adopted is: the signal acquisition circuit under the strong interference rail transit environment comprises a protection part, a filtering part and an isolation part which are sequentially connected, wherein the protection part is used for protecting a device and preventing the device from being damaged; the filtering part is used for filtering interference signals; the isolation part is used for realizing the unidirectional transmission of signals.
The filter part comprises an inductor, a first capacitor and a second capacitor, one end of the inductor is connected with the output end of the protection part, the other end of the inductor is connected with the input end of the isolation part, one end of the first capacitor is connected with the output end of the protection part, and the other end of the first capacitor is grounded; one end of the second capacitor is connected with the input end of the isolation part, and the other end of the second capacitor is grounded.
The isolation part comprises an optical coupler and an RC circuit, wherein the input end of the optical coupler is connected with the output end of the filtering part, and the output end of the optical coupler is connected with the RC circuit.
The protection part comprises a fuse and an anti-reverse diode which are sequentially connected in series, the fuse is used for preventing surge current, and the anti-reverse diode is used for preventing external voltage from invading.
The protection part further comprises a piezoresistor, one end of the piezoresistor is connected to the cathode end of the anti-reverse diode, and the other end of the piezoresistor is grounded.
The shielding portion further includes a gas discharge tube disposed between the varistor and the ground.
Advantageous effects
Since the technical scheme is used, compared with the prior art, the utility model, have following advantage and positive effect: the utility model discloses a protection part, isolation part and supporting filtering part improve signal acquisition circuit's interference killing feature and safety protection ability, and the actual measurement circuit can be stable, work reliably under the simulation on-the-spot interference environment, and the data waveform of gathering meets the requirements, and whole circuit implementation is simple, and low cost.
Drawings
Fig. 1 is a circuit diagram of an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes and modifications of the present invention may be made by those skilled in the art after reading the teachings of the present invention, and these equivalents also fall within the scope of the appended claims.
The embodiment of the utility model relates to a signal acquisition circuit under strong interference track traffic environment, as shown in figure 1, including the protection part 1, the filtering part 2 and the isolation part 3 that connect gradually, the protection part 1 is used for protecting the device and preventing the device from damaging; the filtering part 2 is used for filtering interference signals; the isolation part 3 is used for realizing the unidirectional transmission of signals.
The filter part 2 in this embodiment includes an inductor L1, a first capacitor C1 and a second capacitor C2, one end of the inductor L1 is connected to the output end of the protection part, the other end is connected to the input end of the isolation part, one end of the first capacitor C1 is connected to the output end of the protection part, and the other end is grounded; one end of the second capacitor C2 is connected to the input end of the isolation part, and the other end is grounded. In this embodiment, a pi filter formed by the inductor L1, the first capacitor C1, and the second capacitor C2 is used, and both input and output of the pi filter are low impedance, and since the dc resistance of the inductor L1 is small, when a dc current flows through the inductor L1, a dc voltage drop generated on the inductor L1 is small, so that the dc output voltage is larger.
The isolation section 3 includes an optocoupler U1 and an RC circuit, an input terminal of the optocoupler U1 being connected to an output terminal of the filtering section, and an output terminal being connected to the RC circuit. The input and the output can be effectively isolated by the optical coupler U1, and the interference of the output to the input is prevented.
The protection part 1 comprises a fuse F1 and an anti-reverse diode D1 which are sequentially connected in series, wherein the fuse F1 is used for preventing surge current so as to avoid the device from being burnt out due to the excessive surge current; the anti-reverse diode is used for preventing external voltage invasion. The protection part 1 further comprises a piezoresistor MOV1, one end of the piezoresistor is connected to the cathode end of the anti-reverse diode, the other end of the piezoresistor is grounded, and the piezoresistor is used for eliminating leakage current under a normal working state. The protection part 1 also comprises a gas discharge tube GDT1, the gas discharge tube GDT1 is arranged between the piezoresistor MOV1 and the ground, and the gas discharge tube GDT1 is opened when being struck by lightning/surge, so that energy can be discharged and equipment can be effectively protected.
It is not difficult to discover, the utility model discloses a protection part, isolation part and supporting filtering part improve signal acquisition circuit's interference killing feature and safety protection ability, and the actual measurement circuit can be stable, work reliably under the simulation on-the-spot interference environment, and the data waveform of collection meets the requirements, and whole circuit implementation is simple, and low cost.
Claims (3)
1. A signal acquisition circuit in a strong interference track traffic environment is characterized by comprising a protection part, a filtering part and an isolation part which are sequentially connected, wherein the protection part is used for protecting a device to prevent the device from being damaged; the filtering part is used for filtering interference signals; the isolation part is used for realizing the unidirectional transmission of signals; the protection part comprises a fuse and an anti-reverse diode which are sequentially connected in series, the fuse is used for preventing surge current, and the anti-reverse diode is used for preventing external voltage from invading; the filter part comprises an inductor, a first capacitor and a second capacitor, one end of the inductor is connected with the output end of the protection part, the other end of the inductor is connected with the input end of the isolation part, one end of the first capacitor is connected with the output end of the protection part, and the other end of the first capacitor is grounded; one end of the second capacitor is connected with the input end of the isolation part, and the other end of the second capacitor is grounded; the isolation part comprises an optical coupler and an RC circuit, wherein the input end of the optical coupler is connected with the output end of the filtering part, and the output end of the optical coupler is connected with the RC circuit.
2. The signal acquisition circuit in the strong interference track traffic environment as recited in claim 1, wherein said protection portion further comprises a voltage dependent resistor, one end of said voltage dependent resistor is connected to the cathode terminal of said anti-reverse diode, and the other end is grounded.
3. The signal acquisition circuit in a high interference track traffic environment as recited in claim 2, wherein said protection portion further comprises a gas discharge tube disposed between said varistor and said ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220137185.0U CN217385612U (en) | 2022-01-18 | 2022-01-18 | Signal acquisition circuit under strong interference track traffic environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220137185.0U CN217385612U (en) | 2022-01-18 | 2022-01-18 | Signal acquisition circuit under strong interference track traffic environment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217385612U true CN217385612U (en) | 2022-09-06 |
Family
ID=83095491
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220137185.0U Active CN217385612U (en) | 2022-01-18 | 2022-01-18 | Signal acquisition circuit under strong interference track traffic environment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217385612U (en) |
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2022
- 2022-01-18 CN CN202220137185.0U patent/CN217385612U/en active Active
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