CN210986052U - Signal processing system for inhibiting signal interference of motor vehicle detection device - Google Patents
Signal processing system for inhibiting signal interference of motor vehicle detection device Download PDFInfo
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- CN210986052U CN210986052U CN202020252709.1U CN202020252709U CN210986052U CN 210986052 U CN210986052 U CN 210986052U CN 202020252709 U CN202020252709 U CN 202020252709U CN 210986052 U CN210986052 U CN 210986052U
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Abstract
The utility model discloses a signal processing system for suppressing signal interference of a motor vehicle detection device, which comprises a noise reduction circuit arranged between a switching power supply and the detection device, a suppression circuit connected with a sensor circuit of the detection device, and an instrument amplification circuit; the input end of the suppression circuit is connected with the output end of the sensor circuit; and the output end of the suppression circuit is connected with the input end of the instrument amplification circuit. The utility model discloses effectively restrain power noise and signal interference, improved signal linearity, accuracy.
Description
Technical Field
The utility model relates to a motor vehicle detection field, in particular to signal processing system who restraines motor vehicle detection device signal interference.
Background
Since the state draws up and requires a quality inspection unit to execute the inspection standard of the safety technology of the motor vehicle, a plurality of enterprises of equipment manufacturers, inspection mechanisms, information networking and the like appear in the whole country, the enterprises of motor vehicle networking mainly and strictly execute the national standard, the equipment manufacturers manufacture inspection racks also provide inspection devices, and the inspection devices need to meet the indexes specified by the national standard.
Disclosure of Invention
An object of the utility model is to provide an effectively restrain among the motor vehicle detection device power noise and signal interference's signal processing system to the not enough of existence among the prior art.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a signal processing system for suppressing signal interference of a motor vehicle detection device comprises a noise reduction circuit arranged between a switching power supply and the detection device, a suppression circuit connected with a sensor circuit of the detection device, and an instrument amplification circuit; the input end of the suppression circuit is connected with the output end of the sensor circuit; and the output end of the suppression circuit is connected with the input end of the instrument amplification circuit. The sensor circuit is arranged in the detection device, and the switching power supply is used for supplying power to the detection device and each circuit of the signal processing system.
To explain the present invention, the noise reduction circuit includes an L C filter, a DC/DC converter and a voltage stabilizer connected in sequence.
For further explanation of the present invention, the suppression circuit includes a common mode resistor R1, a common mode resistor R2, a common mode capacitor C1, a common mode capacitor C2, and a differential mode capacitor C3; one ends of the common mode resistor R1 and the common mode resistor R2 are respectively connected with the output end of the sensor circuit, and the other ends of the common mode resistor R1 and the common mode resistor R2 are respectively connected with the instrumentThe meter amplifying circuit is connected; one end of the common-mode capacitor C1 and the input end V of the instrument amplifying circuitIN+The other end of the common-mode capacitor C2 is connected with the common-mode capacitor C2; the other end of the common-mode capacitor C2 and the input end V of the instrument amplifying circuitIN-Connecting; the common-mode capacitor C1 and the common-mode capacitor C2 are connected in series and then connected in parallel with the differential-mode capacitor C3; and a grounding wire is arranged between the common-mode capacitor C1 and the connecting wire of the common-mode capacitor C2.
The power supply voltage VCC is firstly connected to the DC-DC converter through the L C filter, the DC-DC converter is internally converted and isolated, and finally is stabilized and denoised by the voltage stabilizer, the regulated analog circuit is stable in power supply and low in noise, and is isolated from the power supply of other instruments, so that the interference of other access devices in series is avoided, and the precision measurement system is not influenced by the power supply noise.
The detection device is arranged at a certain distance from the detection rack, various electric signals such as a servo motor, a communication line and the like are added, and the electric signals are coupled to the sensor through the distributed capacitor to generate unnecessary interference signals, so that a suppression circuit is required to be added at a signal input end to prevent high-frequency interference signals from entering the detection device.
By adopting the instrument amplifying circuit, the problem of impedance matching of the gain resistor of the differential operational amplifier can be effectively suppressed, the linearity and the accuracy of signals are effectively improved, and meanwhile, interference noise is also suppressed.
The utility model has the advantages that:
the utility model avoids the interference of other access devices due to the arrangement of the noise reduction circuit, so that the precision measurement system is not influenced by power supply noise; by arranging the suppression circuit, high-frequency interference signals do not enter the detection device, and the stability of the signals is further improved; by arranging the instrument amplifying circuit, the problem of impedance matching of the gain resistor of the differential operational amplifier can be effectively solved, the linearity and the accuracy of signals are effectively improved, and meanwhile, interference noise is also suppressed; the suppression circuit and the instrument amplification circuit are combined for use, voltage margin is effectively compensated, the whole voltage feedback loop is subjected to deep negative feedback, and the oscillation phenomenon of the conditioning circuit is prevented.
Drawings
Fig. 1 is a schematic structural diagram of a noise reduction circuit of the present invention;
FIG. 2 is a schematic diagram of the connection between the suppression circuit and the instrument amplification circuit of the present invention;
fig. 3 is a schematic diagram of the connection of the sensor circuit, the suppression circuit and the instrument amplification circuit of the present invention.
Detailed Description
The structure and operation of the present invention will be described in detail with reference to the following embodiments.
Examples
As shown in the figure, the signal processing system for suppressing the signal interference of the motor vehicle detection device comprises a noise reduction circuit arranged between a switching power supply and the detection device, a suppression circuit connected with a sensor circuit of the detection device and an instrument amplification circuit; the input end of the suppression circuit is connected with the output end of the sensor circuit; and the output end of the suppression circuit is connected with the input end of the instrument amplification circuit. The sensor circuit is arranged in the detection device, and the switching power supply is used for supplying power to the detection device and each circuit of the signal processing system.
The noise reduction circuit comprises an L C filter, a DC/DC converter and a voltage stabilizer which are connected in sequence.
The suppression circuit comprises a common-mode resistor R1, a common-mode resistor R2, a common-mode capacitor C1, a common-mode capacitor C2 and a differential-mode capacitor C3; one end of the common mode resistor R1 and one end of the common mode resistor R2 are respectively connected with the output end of the sensor circuit, and the other ends of the common mode resistor R1 and the common mode resistor R2 are respectively connected with the instrument amplifying circuit; one end of the common-mode capacitor C1 and the input end V of the instrument amplifying circuitIN+The other end of the common-mode capacitor C2 is connected with the common-mode capacitor C2; the other end of the common-mode capacitor C2 and the input end V of the instrument amplifying circuitIN-Connecting; the common-mode capacitor C1 and the common-mode capacitor C2 are connected in series and then connected in parallel with the differential-mode capacitor C3; and a grounding wire is arranged between the common-mode capacitor C1 and the connecting wire of the common-mode capacitor C2.
The power supply voltage VCC is firstly connected to the DC-DC converter through the L C filter, the DC-DC converter is subjected to internal conversion and isolation, and finally is subjected to voltage stabilization and noise reduction through the voltage stabilizer, so that the output voltage is lower than VCC noise, and is isolated from the power supply of other instruments, thereby avoiding the series interference of other access equipment and preventing the precision measurement system from being influenced by the power supply noise.
The detection device is arranged at a certain distance from the detection rack, various electric signals such as a servo motor, a communication line and the like are added, and the electric signals are coupled to the sensor through the distributed capacitor to generate unnecessary interference signals, so that a suppression circuit is required to be added at a signal input end to prevent high-frequency interference signals from entering the detection device.
By adopting the instrument amplifying circuit, the problem of impedance matching of the gain resistor of the differential operational amplifier can be effectively suppressed, the linearity and the accuracy of signals are effectively improved, and meanwhile, interference noise is also suppressed.
Claims (3)
1. A signal processing system for suppressing signal interference in a motor vehicle detection device, the detection device comprising a sensor circuit; the method is characterized in that: the signal processing system comprises a noise reduction circuit arranged between the switching power supply and the detection device, a suppression circuit connected with a sensor circuit of the detection device and an instrument amplification circuit; the input end of the suppression circuit is connected with the output end of the sensor circuit; and the output end of the suppression circuit is connected with the input end of the instrument amplification circuit.
2. The signal processing system for suppressing signal interference of motor vehicle detection device as claimed in claim 1, wherein said noise reduction circuit comprises L C filter, DC/DC converter and voltage regulator connected in sequence.
3. The signal processing system for suppressing signal interference in a vehicle detection device of claim 1, wherein: the suppression circuit comprises a common-mode resistor R1, a common-mode resistor R2, a common-mode capacitor C1, a common-mode capacitor C2 and a differential-mode capacitor C3; one end of the common mode resistor R1 and one end of the common mode resistor R2 are respectively connected with the output end of the sensor circuit, and the other ends of the common mode resistor R1 and the common mode resistor R2 are respectively connected with the instrument amplifying circuit; one end of the common-mode capacitor C1 and the input end V of the instrument amplifying circuitIN+The other end of the common-mode capacitor C2 is connected with the common-mode capacitor C2; the common modeThe other end of the capacitor C2 and the input end V of the instrument amplifying circuitIN-Connecting; the common-mode capacitor C1 and the common-mode capacitor C2 are connected in series and then connected in parallel with the differential-mode capacitor C3; and a grounding wire is arranged between the common-mode capacitor C1 and the connecting wire of the common-mode capacitor C2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020252709.1U CN210986052U (en) | 2020-03-04 | 2020-03-04 | Signal processing system for inhibiting signal interference of motor vehicle detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020252709.1U CN210986052U (en) | 2020-03-04 | 2020-03-04 | Signal processing system for inhibiting signal interference of motor vehicle detection device |
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| CN210986052U true CN210986052U (en) | 2020-07-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020252709.1U Expired - Fee Related CN210986052U (en) | 2020-03-04 | 2020-03-04 | Signal processing system for inhibiting signal interference of motor vehicle detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111162742A (en) * | 2020-03-04 | 2020-05-15 | 广西车之家科技有限公司 | Signal processing system for inhibiting signal interference of motor vehicle detection device |
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2020
- 2020-03-04 CN CN202020252709.1U patent/CN210986052U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111162742A (en) * | 2020-03-04 | 2020-05-15 | 广西车之家科技有限公司 | Signal processing system for inhibiting signal interference of motor vehicle detection device |
| CN111162742B (en) * | 2020-03-04 | 2024-06-18 | 广西微车检智能科技有限公司 | Signal processing system for inhibiting signal interference of motor vehicle detection device |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200710 Termination date: 20210304 |