Signal compression and differential circuit and signal acquisition system

Abstract

The utility model belongs to the technical field of signal acquisition, and discloses a signal compression and differential circuit and a signal acquisition system, and the signal compression and differential circuit comprises an operational amplifier; the input end of the signal input filter circuit is used for accessing a sensing signal, and the output end of the signal input filter circuit is electrically connected with the positive input end and the negative input end of the operational amplifier respectively; the positive end of the differential output filter circuit is electrically connected with the positive output end of the operational amplifier, and the negative end of the differential output filter circuit is electrically connected with the negative output end of the operational amplifier; and the signal compression circuit comprises a positive compression circuit and a negative compression circuit. The circuit provided by the utility model has the advantage of simple circuit structure, can effectively improve the anti-interference capability of the circuit, and avoids data loss.

Description

Technical Field

[0001] The utility model belongs to the technical field of signal acquisition, and in particular relates to a signal compression and differential circuit and a signal acquisition system. Background Art

[0002] A shield machine (TBM), also known as a shield tunnel boring machine, is a large-scale automated machine specifically designed for tunnel construction. The machine's operating principle is to use a strong metal shell (the shield casing) to support the soil and rock surrounding the tunnel while simultaneously excavating, advancing, and constructing the lining structure under the protection of the shield casing.

[0003] Existing technology monitors and diagnoses the shield machine's operating status by placing trigger sensors on the shield machine's blades and installing detection sensors through holes drilled in the tunnel wall. However, existing sensors often collect waveforms through separate filtering circuits when acquiring relevant signals. However, separate filtering circuits are prone to data loss and complex circuitry in practical applications. Utility Model Content

[0004] The purpose of the utility model is to provide a signal compression and differential circuit and a signal acquisition system to solve the problems of easy data loss and complex circuits in existing single filter circuits in practical applications.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] In a first aspect, the present invention provides a signal compression and differential circuit, the signal compression and differential circuit comprising:

[0007] Operational amplifiers;

[0008] A signal input filter circuit, wherein the input end of the signal input filter circuit is used to receive the sensor signal, and the output end of the signal input filter circuit is electrically connected to the positive input end and the negative input end of the operational amplifier respectively;

[0009] a differential output filter circuit, wherein a positive terminal of the differential output filter circuit is electrically connected to the positive output terminal of the operational amplifier, and a negative terminal of the differential output filter circuit is electrically connected to the negative output terminal of the operational amplifier;

[0010] A signal compression circuit, comprising: a positive compression circuit and a negative compression circuit, wherein the input of the positive compression circuit is electrically connected to the positive input of the operational amplifier, and the output of the positive compression circuit is connected between the positive output of the operational amplifier and the positive end of the differential output filter circuit; the input of the negative compression circuit is electrically connected to the negative input of the operational amplifier, and the output of the negative compression circuit is connected between the negative output of the operational amplifier and the negative end of the differential output filter circuit.

[0011] Preferably, the signal compression and differential circuit further includes: a common mode circuit, wherein the input end of the common mode circuit is connected to a common mode power supply, and the output end of the common mode circuit is electrically connected to the common mode end of the operational amplifier.

[0012] Preferably, the signal input filter circuit includes: a filter capacitor C1, a resistor R1 and a resistor R2; the sensing signal includes: a positive sensing signal and a negative sensing signal; the input end of the signal input filter circuit includes: a positive signal input end and a negative signal input end; the output end of the signal input filter circuit includes: a positive signal output end and a negative signal output end;

[0013] The first end of the filter capacitor C1 is used as the positive signal input end of the signal input filter circuit, and the positive signal input end of the signal input filter circuit is used to receive the positive sensing signal. The second end of the filter capacitor C1 is electrically connected to the first end of the resistor R1. The second end of the resistor R1 is used as the positive signal output end of the signal input filter circuit, and the second end of the resistor R1 is electrically connected to the positive input end of the operational amplifier.

[0014] The first end of the resistor R2 is used as the negative signal input end of the signal input filter circuit, and the negative signal input end of the signal input filter circuit is used to receive the negative sensing signal. The second end of the resistor R2 is used as the negative signal output end of the signal input filter circuit, the first end of the resistor R2 is grounded, and the second end of the resistor R2 is electrically connected to the negative input end of the operational amplifier.

[0015] Preferably, the signal compression and differential circuit further comprises: an input power circuit, the input power circuit being connected to the input end of the signal input filter circuit; the input power circuit comprising: a filter capacitor C2 and a diode D1;

[0016] The first end of the filter capacitor C2 is electrically connected to the anode of the diode D1, the second end of the filter capacitor C2 is grounded, the cathode of the diode is electrically connected to the first end of the filter capacitor C1, and the anode of the diode D1 is connected to a power supply.

[0017] Preferably, the differential output filter circuit includes: a resistor R3, a resistor R6, a filter capacitor C6, a filter capacitor C7 and a filter capacitor C8;

[0018] The first end of the resistor R3 is electrically connected to the negative output terminal of the operational amplifier, and the second end of the resistor R3 is electrically connected to the first end of the filter capacitor C8 and the first end of the filter capacitor C7 respectively;

[0019] The first end of the resistor R6 is electrically connected to the positive output terminal of the operational amplifier, and the second end of the resistor R3 is electrically connected to the second end of the filter capacitor C8 and the second end of the filter capacitor C7 respectively;

[0020] The second end of the filter capacitor C6 and the second end of the filter capacitor C7 are both grounded.

[0021] Preferably, the forward compression circuit comprises: a resistor R5 and a capacitor C5;

[0022] The first end of the resistor R5 and the first end of the capacitor C5 are both electrically connected to the positive input terminal of the operational amplifier;

[0023] The second end of the resistor R5 is electrically connected to the second end of the resistor R6 , and the second end of the capacitor C5 is electrically connected to the positive output end of the operational amplifier.

[0024] Preferably, the negative compression circuit comprises: a resistor R4 and a capacitor C4;

[0025] The first end of the resistor R4 and the first end of the capacitor C4 are both electrically connected to the negative input terminal of the operational amplifier;

[0026] The second end of the resistor R4 is electrically connected to the second end of the resistor R3 , and the second end of the capacitor C4 is electrically connected to the negative output end of the operational amplifier.

[0027] In a second aspect, the present invention provides a signal acquisition system, the system comprising: the above-mentioned signal compression and differential circuit, a sensor and a main controller;

[0028] The sensor is used to monitor the shield machine blade and output the monitored sensor signal;

[0029] The signal output end of the sensor is electrically connected to the input end of the signal input filter circuit of the signal compression and differential circuit, and the output end of the differential output filter circuit of the signal compression and differential circuit is electrically connected to the signal input end of the main controller.

[0030] The sensors include trigger sensors and / or detection sensors.

[0031] Beneficial effects:

[0032] 1. The signal compression and differential circuit of the utility model is mainly composed of an operational amplifier, a signal input filter circuit, a differential output filter circuit and a signal compression circuit, and the circuit structure is simple;

[0033] 2. The utility model monitors the shield machine blade through a sensor, inputs the monitored sensor signal into the positive input terminal and negative input terminal of the operational amplifier through a signal input filter circuit, and then compresses the signal through a signal compression circuit to achieve signal compression processing; at the same time, the signal input filter circuit is combined with the filtering processing of the input signal (i.e., the sensor signal) and the differential output filter circuit is combined with the filtering processing of the output signal of the operational amplifier, which can effectively improve the anti-interference ability of the circuit and avoid data loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following detailed description, they are used to explain the embodiments of the present invention, but do not constitute a limitation of the embodiments of the present invention. In the accompanying drawings:

[0035] Figure 1 This is a block diagram of a signal compression and differential circuit provided by one embodiment of the present invention;

[0036] Figure 2 This is a schematic diagram of a signal compression and differential circuit provided by one embodiment of the present utility model;

[0037] Figure 3 This is a block diagram of a signal acquisition system provided by one embodiment of the present utility model. DETAILED DESCRIPTION

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be briefly introduced below in conjunction with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structures of the drawings is only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0039] Example 1

[0040] Figure 1 This is a block diagram of a signal compression and differential circuit provided by an embodiment of the present invention, such as Figure 1As shown, this embodiment provides a signal compression and differential circuit, which includes: an operational amplifier, a signal input filter circuit, a differential output filter circuit and a signal compression circuit; the signal compression and differential circuit of this embodiment is mainly composed of an operational amplifier, a signal input filter circuit, a differential output filter circuit and a signal compression circuit, and the overall circuit structure is simple.

[0041] Among them, the operational amplifier and the signal compression circuit are used together to compress the input signal, which is the sensor signal output by the sensor; the input filter circuit is mainly used to filter the input signal, and the differential output filter circuit is used to output the differential signal jointly output by the operational amplifier and the signal compression circuit, and also filters the differential signal.

[0042] The input end of the signal input filter circuit is used to receive the sensor signal, and the output end of the signal input filter circuit is electrically connected to the positive input end and the negative input end of the operational amplifier respectively;

[0043] The positive end of the differential output filter circuit is electrically connected to the positive output end of the operational amplifier, and the negative end of the differential output filter circuit is electrically connected to the negative output end of the operational amplifier;

[0044] The signal compression circuit includes: a positive compression circuit and a negative compression circuit, the input end of the positive compression circuit is electrically connected to the positive input end of the operational amplifier, and the output end of the positive compression circuit is connected between the positive output end of the operational amplifier and the positive end of the differential output filter circuit; the input end of the negative compression circuit is electrically connected to the negative input end of the operational amplifier, and the output end of the negative compression circuit is connected between the negative output end of the operational amplifier and the negative end of the differential output filter circuit.

[0045] The sensing signal output by the sensor of the present invention is input to the positive input terminal of the operational amplifier by the signal input filtering circuit, and then the signal is compressed by the signal compression circuit to realize the compression processing of the signal; at the same time, the signal input filtering circuit is combined with the filtering processing of the input signal and the differential output filtering circuit is combined with the filtering processing of the output signal of the operational amplifier, which can effectively improve the anti-interference ability of the circuit and avoid data loss.

[0046] As a further optimization of this embodiment, Figure 2As shown, the signal compression and differentiating circuit further includes a common-mode circuit, wherein the input end of the common-mode circuit is connected to a common-mode power supply, and the output end of the common-mode circuit is electrically connected to the common-mode terminal of the operational amplifier. The common-mode circuit includes a capacitor C3 and a power supply access terminal WDC2. The first end of capacitor C3, serving as the output end of the common-mode circuit, is electrically connected to the common-mode terminal of the operational amplifier. The power supply access terminal WDC2 is disposed between capacitor C3 and the operational amplifier. The second end of capacitor C3 is grounded. The power supply access terminal WDC2 is used to connect to the common-mode power supply.

[0047] In this embodiment, the common-mode power supply is an adjustable switching power supply, which can flexibly adjust the common-mode voltage value of the operational amplifier according to actual needs.

[0048] As a further optimization of this embodiment, Figure 2 As shown, the signal input filter circuit includes: a filter capacitor C1, a resistor R1 and a resistor R2, the sensing signal includes: a positive sensing signal and a negative sensing signal; the input end of the signal input filter circuit includes: a positive signal input end and a negative signal input end, and the output end of the signal input filter circuit includes: a positive signal output end and a negative signal output end;

[0049] The first end of the filter capacitor C1 is used as the positive signal input end of the signal input filter circuit, and the positive signal input end of the signal input filter circuit is used to receive the positive sensing signal. The second end of the filter capacitor C1 is electrically connected to the first end of the resistor R1. The second end of the resistor R1 is used as the positive signal output end of the signal input filter circuit, and the second end of the resistor R1 is electrically connected to the positive input end of the operational amplifier.

[0050] The first end of the resistor R2 is used as the negative signal input end of the signal input filter circuit, and the negative signal input end of the signal input filter circuit is used to receive the negative sensing signal. The second end of the resistor R2 is used as the negative signal output end of the signal input filter circuit, the first end of the resistor R2 is grounded, and the second end of the resistor R2 is electrically connected to the negative input end of the operational amplifier.

[0051] The input signal is input into the operational amplifier through the diode D1, the filter capacitor C1 and the resistor R2.

[0052] As a further optimization of this embodiment, Figure 2As shown, the signal compression and differential circuit further includes: an input power supply circuit, which is connected to the input end of the signal input filter circuit; the input power supply circuit includes: a filter capacitor C2 and a diode D1; the first end of the filter capacitor C2 is electrically connected to the positive electrode of the diode D1, the second end of the filter capacitor C2 is grounded, the cathode of the diode is electrically connected to the first end of the filter capacitor C1, and the positive electrode of the diode D1 is connected to the power supply.

[0053] Among them, diode D1 can prevent the positive and negative poles of the power supply from being reversed. Figure 2 The WDC1 port in the circuit is connected to the power supply, and the filter capacitor C2 can filter the power supply to improve the stability of the power supply.

[0054] As a further optimization of this embodiment, Figure 2 As shown, the differential output filter circuit includes: a resistor R3, a resistor R6, a filter capacitor C6, a filter capacitor C7 and a filter capacitor C8;

[0055] The first end of the resistor R3 is electrically connected to the negative output terminal of the operational amplifier, and the second end of the resistor R3 is electrically connected to the first end of the filter capacitor C8 and the first end of the filter capacitor C7 respectively;

[0056] The first end of the resistor R6 is electrically connected to the positive output terminal of the operational amplifier, and the second end of the resistor R3 is electrically connected to the second end of the filter capacitor C8 and the second end of the filter capacitor C7 respectively;

[0057] The second end of the filter capacitor C6 and the second end of the filter capacitor C7 are both grounded.

[0058] Among them, using the filter capacitors C6, C7 and C8 to filter the output signal of the operational amplifier can effectively improve the anti-interference capability of the circuit.

[0059] In this embodiment, the forward compression circuit includes: a resistor R5 and a capacitor C5; the forward compression circuit is mainly used to reduce the input forward sensing signal according to a certain ratio;

[0060] The first end of the resistor R5 and the first end of the capacitor C5 are both electrically connected to the positive input terminal of the operational amplifier;

[0061] The second end of the resistor R5 is electrically connected to the second end of the resistor R6 , and the second end of the capacitor C5 is electrically connected to the positive output end of the operational amplifier.

[0062] In this embodiment, if Figure 2As shown, the negative compression circuit includes: a resistor R4 and a capacitor C4; the negative compression circuit is mainly used to reduce the input negative sensor signal according to a certain ratio;

[0063] The first end of the resistor R4 and the first end of the capacitor C4 are both electrically connected to the negative input terminal of the operational amplifier;

[0064] The second end of the resistor R4 is electrically connected to the second end of the resistor R3 , and the second end of the capacitor C4 is electrically connected to the negative output end of the operational amplifier.

[0065] In this embodiment, the positive sensing signal and the negative sensing signal, which are reduced in a certain ratio, are finally output by the differential output filter circuit and are output as differential signals.

[0066] Example 2

[0067] Figure 3 This is a block diagram of a signal acquisition system provided by one embodiment of the present invention. Figure 3 As shown, this embodiment provides a signal acquisition system, which includes: the signal compression and differential circuit, sensor and main controller of embodiment 1;

[0068] The sensor is used to monitor the shield machine blade and output the monitored sensor signal;

[0069] The sensor's signal output is electrically connected to the input of a signal input filter circuit of a signal compression and differential circuit, and the output of the differential output filter circuit of the signal compression and differential circuit is electrically connected to the signal input of a host controller. The sensor includes a trigger sensor and / or a detection sensor, and the host controller may be a PLC (Programmable Logic Controller).

[0070] The utility model monitors the shield machine blade through a sensor, inputs the monitored sensor signal into the positive input terminal and the negative input terminal of the operational amplifier through a signal input filter circuit, and then compresses the signal through a signal compression circuit to realize signal compression processing; at the same time, the signal input filter circuit filters the input signal (i.e., the sensor signal) and the differential output filter circuit filters the output signal of the operational amplifier, which can effectively improve the circuit's anti-interference ability and avoid data loss.

[0071] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A signal compression and differential circuit, characterized in that: The signal compression and differential circuit includes: Operational amplifiers; A signal input filter circuit, wherein the input end of the signal input filter circuit is used to receive the sensor signal, and the output end of the signal input filter circuit is electrically connected to the positive input end and the negative input end of the operational amplifier respectively; a differential output filter circuit, wherein a positive terminal of the differential output filter circuit is electrically connected to the positive output terminal of the operational amplifier, and a negative terminal of the differential output filter circuit is electrically connected to the negative output terminal of the operational amplifier; A signal compression circuit, comprising: a positive compression circuit and a negative compression circuit, wherein the input of the positive compression circuit is electrically connected to the positive input of the operational amplifier, and the output of the positive compression circuit is connected between the positive output of the operational amplifier and the positive end of the differential output filter circuit; the input of the negative compression circuit is electrically connected to the negative input of the operational amplifier, and the output of the negative compression circuit is connected between the negative output of the operational amplifier and the negative end of the differential output filter circuit.

2. The signal compression and differential circuit according to claim 1, wherein: The signal compression and differential circuit further includes: a common mode circuit, wherein an input end of the common mode circuit is connected to a common mode power supply, and an output end of the common mode circuit is electrically connected to the common mode end of the operational amplifier.

3. The signal compression and differential circuit according to claim 1, wherein: The signal input filter circuit includes: a filter capacitor C1, a resistor R1 and a resistor R2, the sensing signal includes: a positive sensing signal and a negative sensing signal; the input end of the signal input filter circuit includes: a positive signal input end and a negative signal input end, and the output end of the signal input filter circuit includes: a positive signal output end and a negative signal output end; The first end of the filter capacitor C1 is used as the positive signal input end of the signal input filter circuit, and the positive signal input end of the signal input filter circuit is used to receive the positive sensing signal. The second end of the filter capacitor C1 is electrically connected to the first end of the resistor R1. The second end of the resistor R1 is used as the positive signal output end of the signal input filter circuit, and the second end of the resistor R1 is electrically connected to the positive input end of the operational amplifier. The first end of the resistor R2 is used as the negative signal input end of the signal input filter circuit, and the negative signal input end of the signal input filter circuit is used to receive the negative sensing signal. The second end of the resistor R2 is used as the negative signal output end of the signal input filter circuit, the first end of the resistor R2 is grounded, and the second end of the resistor R2 is electrically connected to the negative input end of the operational amplifier.

4. The signal compression and differential circuit according to claim 3, characterized in that: The signal compression and differential circuit further includes: an input power circuit, the input power circuit being connected to the input end of the signal input filter circuit; the input power circuit including: a filter capacitor C2 and a diode D1; The first end of the filter capacitor C2 is electrically connected to the anode of the diode D1, the second end of the filter capacitor C2 is grounded, the cathode of the diode is electrically connected to the first end of the filter capacitor C1, and the anode of the diode D1 is connected to a power supply.

5. The signal compression and differential circuit according to claim 1, wherein: The differential output filter circuit includes: a resistor R3, a resistor R6, a filter capacitor C6, a filter capacitor C7 and a filter capacitor C8; The first end of the resistor R3 is electrically connected to the negative output terminal of the operational amplifier, and the second end of the resistor R3 is electrically connected to the first end of the filter capacitor C8 and the first end of the filter capacitor C7 respectively; The first end of the resistor R6 is electrically connected to the positive output terminal of the operational amplifier, and the second end of the resistor R3 is electrically connected to the second end of the filter capacitor C8 and the second end of the filter capacitor C7 respectively; The second end of the filter capacitor C6 and the second end of the filter capacitor C7 are both grounded.

6. The signal compression and differential circuit according to claim 5, characterized in that: The forward compression circuit includes: a resistor R5 and a capacitor C5; The first end of the resistor R5 and the first end of the capacitor C5 are both electrically connected to the positive input terminal of the operational amplifier; The second end of the resistor R5 is electrically connected to the second end of the resistor R6 , and the second end of the capacitor C5 is electrically connected to the positive output end of the operational amplifier.

7. The signal compression and differential circuit according to claim 5, characterized in that: The negative compression circuit includes: a resistor R4 and a capacitor C4; The first end of the resistor R4 and the first end of the capacitor C4 are both electrically connected to the negative input terminal of the operational amplifier; The second end of the resistor R4 is electrically connected to the second end of the resistor R3 , and the second end of the capacitor C4 is electrically connected to the negative output end of the operational amplifier.

8. A signal acquisition system, characterized in that: The system comprises: the signal compression and differential circuit, sensor and main controller according to any one of claims 1 to 7; The sensor is used to monitor the shield machine blade and output the monitored sensor signal; The signal output end of the sensor is electrically connected to the input end of the signal input filter circuit of the signal compression and differential circuit, and the output end of the differential output filter circuit of the signal compression and differential circuit is electrically connected to the signal input end of the main controller.

9. The signal acquisition system according to claim 8, characterized in that: The sensors include trigger sensors and / or detection sensors.

Images