Underground pipeline detection signal transmitting device

Abstract

The utility model belongs to the technical field of underground pipeline detection, and particularly relates to an underground pipeline detection signal transmitting device which comprises a signal transmitting module. The full-bridge driving circuit is connected with the signal transmitting module; the booster circuit is connected with the full-bridge driving circuit; one end of the sampling circuit is connected with the booster circuit, the other end of the sampling circuit is connected with the signal transmitting module, the sampling circuit is used for sampling current signals and voltage signals of the output signals and outputting the current signals and the voltage signals to the signal transmitting module, and the signal transmitting module modulates SVPWM signals according to the current signals and the voltage signals of the output signals. The current signal and the voltage signal of the output signal are sampled through the sampling circuit and fed back to the signal transmitting module, and the signal transmitting module can modulate the SVPWM signal according to the current signal and the voltage signal, so that the SVPWM signal with constant power is output.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underground pipeline detection, and in particular to an underground pipeline detection signal emitting device. BACKGROUND

[0002] With the acceleration of urbanization, underground pipelines and cables (including power cables, communication optical cables, water supply pipelines, etc.) are increasingly widely used in urban construction. The underground environment is complex, with interference factors such as geological structure, underground water system, and existing building foundation. Pipeline laying is difficult to observe directly due to deep underground burial, which brings great difficulties to maintenance and management. Traditional detection methods such as electromagnetic induction principle detection instruments have the problem of inaccurate positioning, are easily disturbed by surrounding metal facilities and geomagnetic changes, leading to errors in the detection results. Moreover, the above-mentioned detection instruments are complex to operate, time-consuming and laborious in data acquisition, analysis and interpretation, and are difficult to meet the needs of modern pipeline management.

[0003] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present disclosure, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0004] In view of at least one of the above technical problems, the present application provides an underground pipeline detection signal emitting device.

[0005] The present application provides an underground pipeline detection signal emitting device, comprising:

[0006] a signal emitting module for outputting an SVPWM signal;

[0007] a full-bridge driving circuit connected with the signal emitting module, for receiving the SVPWM signal and rectifying it into a sine wave signal;

[0008] a boost circuit connected with the full-bridge driving circuit, for boosting the sine wave signal to generate an output signal, and coupling the output signal to the pipeline to be detected;

[0009] a sampling circuit connected at one end with the boost circuit and at the other end with the signal emitting module, for sampling the current signal and voltage signal of the output signal and outputting them to the signal emitting module, and the signal emitting module modulating the SVPWM signal according to the current signal and voltage signal of the output signal.

[0010] One of the above technical solutions has at least one of the following advantages or beneficial effects: the present application samples the current signal and voltage signal of the output signal through the sampling circuit and feeds them back to the signal emitting module, which can modulate the SVPWM signal accordingly, thus realizing the output of constant power SVPWM signal.

[0011] In some possible implementation manners, the full-bridge driving circuit comprises a first driving circuit, a first rectifier circuit, a second driving circuit and a second rectifier circuit, a first end of the first driving circuit is connected with the signal transmitting module, a first end of the first rectifier circuit is connected with a second end of the first driving circuit, a second end of the first rectifier circuit is connected with the voltage boosting circuit, a first end of the second driving circuit is connected with the signal transmitting module, a first end of the second rectifier circuit is connected with a second end of the second driving circuit, and a second end of the second rectifier circuit is connected with the voltage boosting circuit.

[0012] In some possible implementation manners, the first driving circuit comprises a first field effect transistor and a second field effect transistor, a gate of the first field effect transistor and a gate of the second field effect transistor are connected with the signal transmitting module, a source of the first field effect transistor and a drain of the second field effect transistor are connected with the first rectifier circuit, a drain of the first field effect transistor is connected with a 5V power supply, and a source of the second field effect transistor is grounded.

[0013] In some possible implementation manners, the first rectifier circuit comprises a first inductor and a first capacitor, a first end of the first inductor is connected with the gate of the first field effect transistor and the gate of the second field effect transistor, a second end of the first inductor is connected with the voltage boosting circuit, a first end of the first capacitor is connected with the second end of the first inductor, and a second end of the first capacitor is grounded.

[0014] In some possible implementation manners, the second driving circuit comprises a third field effect transistor and a fourth field effect transistor, a gate of the third field effect transistor and a gate of the fourth field effect transistor are connected with the signal transmitting module, a source of the third field effect transistor and a drain of the fourth field effect transistor are connected with the second rectifier circuit, a drain of the third field effect transistor is connected with the 5V power supply, and a source of the fourth field effect transistor is grounded.

[0015] In some possible implementation manners, the second rectifier circuit comprises a second inductor and a second capacitor, a first end of the second inductor is connected with the gate of the third field effect transistor and the gate of the fourth field effect transistor, a second end of the second inductor is connected with the voltage boosting circuit, a first end of the second capacitor is connected with the second end of the second inductor, and a second end of the second capacitor is grounded.

[0016] In some possible implementation manners, the voltage boosting circuit comprises a voltage booster and a sampling resistor, the voltage booster is used to boost the sine wave signal by 8 times, one end of the voltage booster is connected with the first rectifier circuit and the second rectifier circuit respectively, and the other end of the voltage booster is coupled to the pipeline to be measured through the sampling resistor.

[0017] In some possible implementation manners, the sampling circuit comprises a first amplification circuit;

[0018] The first amplifier circuit includes: a first operational amplifier, a thirteenth resistor, a first resistor, a second resistor, and a third resistor. The first terminal of the first operational amplifier is connected to the first terminal of the sampling resistor through the thirteenth resistor. The second terminal of the first operational amplifier is connected to the second terminal of the sampling resistor through the first resistor. The third terminal of the first operational amplifier is connected to the second terminal of the first operational amplifier through the second resistor. The third terminal of the first operational amplifier is connected to the signal transmitting module. One end of the third resistor is connected to the first terminal of the first operational amplifier, and the other end of the third resistor is grounded.

[0019] In some possible implementations, the sampling circuit includes: a second amplifier circuit;

[0020] The second amplifier circuit includes: a second operational amplifier, a tenth resistor, a ninth resistor, an eleventh resistor, and a twelfth resistor. The first terminal of the second operational amplifier is connected to one end of the sampling resistor through the tenth resistor. The second terminal of the second operational amplifier is grounded through the ninth resistor. The third terminal of the second operational amplifier is connected to the second terminal of the second operational amplifier through the eleventh resistor. The third terminal of the second operational amplifier is connected to the signal transmitting module. One end of the twelfth resistor is connected to the first terminal of the second operational amplifier, and the other end of the twelfth resistor is grounded.

[0021] The present application will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A structural diagram of the underground pipeline detection signal transmitting device provided in the embodiments of this application;

[0024] Figure 2 for Figure 1 The diagram shows the structure of the full-bridge drive circuit and the sampling circuit.

[0025] Figure 3 for Figure 1 The circuit diagram shown is for an underground pipeline detection signal transmitting device. Detailed Implementation

[0026] In order to make the above objectives, characteristics and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below with reference to the drawings. In the following description, a large number of specific details are set forth in order to provide a sufficient understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0027] As shown in Figures 1 to 3 The present embodiment provides an underground pipeline detection signal transmitting device, comprising: a signal transmitting module 110, a full-bridge driving circuit 120, a boost circuit 130 and a sampling circuit 140.

[0028] The signal transmitting module 110 is configured to output an SVPWM signal; the full-bridge driving circuit 120 is connected to the signal transmitting module 110 and configured to receive the SVPWM signal and rectify it into a sine wave signal; the boost circuit 130 is connected to the full-bridge driving circuit 120 and configured to boost the sine wave signal to generate an output signal and couple the output signal to a pipeline to be detected; and the sampling circuit 140 has one end connected to the boost circuit 130 and the other end connected to the signal transmitting module 110, and is configured to sample a current signal and a voltage signal of the output signal and output them to the signal transmitting module 110, so that the signal transmitting module 110 modulates the SVPWM signal according to the current signal and the voltage signal of the output signal.

[0029] The present application samples the current signal and the voltage signal of the output signal through the sampling circuit 140 and feeds them back to the signal transmitting module 110, so that the signal transmitting module 110 can modulate the SVPWM signal accordingly, thus realizing the output of the SVPWM signal with constant power.

[0030] The signal transmitting module 110 is a DSP chip, which integrates a PID algorithm and can modulate the current and voltage of the output signal. Since pipeline detection is usually performed outdoors, the energy consumption of the detection device needs to be considered, and the voltage output by the transmitting device cannot be too high for safety considerations to avoid safety accidents. Therefore, the signal transmitting module 110 uses the PID algorithm to output constantly, limits the maximum output voltage to 40V and the maximum output current to 0.5A, thus realizing constant power output.

[0031] The output of the PID algorithm can be expressed as:

[0032] u(t) = Kp * e(t) + Ki * ∫e(t)dt + Kd * de(t) / dt

[0033] Where u(t) is the output of the PID modulation unit, e(t) is the current error value, ∫e(t)dt is the integral of the error, de(t) / dt is the derivative (rate of change) of the error, and Kp, Ki, and Kd are control parameters that need to be adjusted according to the specific control system and control requirements.

[0034] In this PID algorithm, the proportional (P) part generates a control output proportional to the current error value. A larger proportional coefficient (Kp) results in a faster response to the error, but an excessively large proportional coefficient can cause system oscillations. The integral (I) part considers the cumulative effect of the error, generating the control output by integrating the error. The integral coefficient (Ki) adjusts the magnitude of the integral action. Integral action helps eliminate steady-state errors, but improperly set integral coefficients can lead to slow system response or overshoot. The derivative (D) part generates the control output based on the rate of change of the error, responding to the speed of error change. The derivative coefficient (Kd) adjusts the magnitude of the derivative action. Derivative action helps predict future trends in the error, thus improving system stability and response speed, but improperly set derivative coefficients can amplify noise or cause system instability.

[0035] like Figures 1 to 3 As shown, in some embodiments, the full-bridge drive circuit 120 includes: a first drive circuit 121, a first rectifier circuit 122, a second drive circuit 123, and a second rectifier circuit 124. The first terminal of the first drive circuit 121 is connected to the signal transmitting module 110, the first terminal of the first rectifier circuit 122 is connected to the second terminal of the first drive circuit 121, the second terminal of the first rectifier circuit 122 is connected to the boost circuit 130, the first terminal of the second drive circuit 123 is connected to the signal transmitting module 110, the first terminal of the second rectifier circuit 124 is connected to the second terminal of the second drive circuit 123, and the second terminal of the second rectifier circuit 124 is connected to the boost circuit 130.

[0036] In the full-bridge drive circuit 120, the signal transmitting module 110 controls the first drive circuit 121 and the second drive circuit 123 respectively, allowing for more flexible adjustment of the SVPWM signal input and precise control of the characteristics of the rectified sinusoidal signal, such as amplitude and frequency. Furthermore, the first rectifier circuit 122 and the second rectifier circuit 124 convert the SVPWM signal output from the signal transmitting module 110 into a sinusoidal signal. This rectification method helps convert the pulse width modulation signal into a sinusoidal form more suitable for transmission in underground pipeline path detection. Sinusoidal signals have better stability and anti-interference capabilities during transmission, reducing signal distortion and ensuring effective signal propagation in complex underground electromagnetic environments.

[0037] like Figures 1 to 3 As shown, in some embodiments, the first driving circuit 121 includes: a first field-effect transistor Q1 and a second field-effect transistor Q2. The gates of the first field-effect transistor Q1 and the second field-effect transistor Q2 are connected to the signal transmitting module 110. The source of the first field-effect transistor Q1 and the drain of the second field-effect transistor Q2 are connected to the first rectifier circuit 122. The drain of the first field-effect transistor Q1 is connected to a 5V power supply, and the source of the second field-effect transistor Q2 is grounded.

[0038] The first rectifier circuit 122 includes: a first inductor L1 and a first capacitor C1. The first end of the first inductor L1 is connected to the gate of the first field-effect transistor Q1 and the gate of the second field-effect transistor Q2. The second end of the first inductor L1 is connected to the boost circuit 130. The first end of the first capacitor C1 is connected to the second end of the first inductor L1. The second end of the first capacitor C1 is grounded.

[0039] The second driving circuit 123 includes a third field-effect transistor Q3 and a fourth field-effect transistor Q4. The gates of the third field-effect transistor Q3 and the fourth field-effect transistor Q4 are connected to the signal transmitting module 110. The source of the third field-effect transistor Q3 and the drain of the fourth field-effect transistor Q4 are connected to the second rectifier circuit 124. The drain of the third field-effect transistor Q3 is connected to a 5V power supply, and the source of the fourth field-effect transistor Q4 is grounded.

[0040] The second rectifier circuit 124 includes: a second inductor L2 and a second capacitor C2. The first end of the second inductor L2 is connected to the gate of the third field-effect transistor Q3 and the gate of the fourth field-effect transistor Q4. The second end of the second inductor L2 is connected to the boost circuit 130. The first end of the second capacitor C2 is connected to the second end of the second inductor L2. The second end of the second capacitor C2 is grounded.

[0041] The signal transmitting module 110 controls the on and off states of the first field-effect transistor Q1, the second field-effect transistor Q2, the third field-effect transistor Q3, and the fourth field-effect transistor Q4 through a common gate, thereby precisely adjusting the signals input to the first rectifier circuit 122 and the second rectifier circuit 124.

[0042] like Figures 1 to 3 As shown, in some embodiments, the boost circuit 130 includes a boost converter T1 and a sampling resistor R8. The boost converter T1 is used to boost the sine wave signal by 8 times. One end of the boost converter T1 is connected to the first rectifier circuit 122 and the second rectifier circuit 124 respectively, and the other end of the boost converter T1 is coupled to the pipeline under test through the sampling resistor R8.

[0043] like Figures 1 to 3 As shown, in some embodiments, the sampling circuit 140 includes: a first amplifier circuit 141;

[0044] The first amplifier circuit 141 includes: a first operational amplifier U1, a thirteenth resistor R13, a first resistor R1, a second resistor R2, and a third resistor R3. The first terminal of the first operational amplifier U1 is connected to the first terminal of the sampling resistor R8 through the thirteenth resistor R13. The second terminal of the first operational amplifier U1 is connected to the second terminal of the sampling resistor R8 through the first resistor R1. The third terminal of the first operational amplifier U1 is connected to the second terminal of the first operational amplifier U1 through the second resistor R2. The third terminal of the first operational amplifier U1 is connected to the signal transmitting module. One end of the third resistor R3 is connected to the first terminal of the first operational amplifier U1, and the other end of the third resistor R3 is grounded. The first amplifier circuit 141 can effectively suppress common-mode interference signals and improve signal quality in application scenarios such as underground pipeline path detection, where complex electromagnetic environments may exist.

[0045] like Figures 1 to 3 As shown, in some embodiments, the sampling circuit 140 includes a second amplifier circuit 142;

[0046] The second amplifier circuit 142 includes: a second operational amplifier U2, a tenth resistor R10, a ninth resistor R9, an eleventh resistor R11, and a twelfth resistor R12. The first terminal of the second operational amplifier U2 is connected to one end of the sampling resistor R8 through the tenth resistor R10. The second terminal of the second operational amplifier U2 is grounded through the ninth resistor R9. The third terminal of the second operational amplifier U2 is connected to the second terminal of the second operational amplifier U2 through the eleventh resistor R11. The third terminal of the second operational amplifier U2 is connected to the signal transmitting module. One end of the twelfth resistor R12 is connected to the first terminal of the second operational amplifier U2, and the other end of the twelfth resistor R12 is grounded. The second amplifier circuit 142 can effectively suppress common-mode interference signals, improving signal quality in applications such as underground pipeline path detection where complex electromagnetic environments may exist.

[0047] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0048] In the embodiments of the present application, unless specifically defined and limited otherwise, the terms "mounting", "connection", "connecting", "fixing" and the like should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0049] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Any person skilled in the art can make many possible changes and modifications to the technical solutions of the present application, or modify them into equivalent embodiments with equivalent changes, without departing from the scope of the technical solutions of the present application, by using the methods and technical contents disclosed above. Therefore, any equivalent changes made according to the shape, structure and principle of the present application, without departing from the technical solutions of the present application, should be covered within the protection scope of the present application.

Claims

1. An underground pipeline detection signal launching device, characterized by, include: The signal transmitting module is used to output SVPWM signals; A full-bridge drive circuit, connected to the signal transmitting module, is used to receive the SVPWM signal and rectify it into a sine wave signal. A boost circuit, connected to the full-bridge drive circuit, is used to boost the sinusoidal signal to generate an output signal and couple the output signal to the pipeline under test. The sampling circuit is connected at one end to the boost circuit and at the other end to the signal transmitting module. It is used to sample the current signal and voltage signal of the output signal and output them to the signal transmitting module. The signal transmitting module modulates the SVPWM signal according to the current signal and voltage signal of the output signal.

2. The subsurface pipe inspection signal launch device of claim 1, wherein, The full-bridge drive circuit includes: a first drive circuit, a first rectifier circuit, a second drive circuit, and a second rectifier circuit. The first terminal of the first drive circuit is connected to the signal transmitting module. The first terminal of the first rectifier circuit is connected to the second terminal of the first drive circuit. The second terminal of the first rectifier circuit is connected to the boost circuit. The first terminal of the second drive circuit is connected to the signal transmitting module. The first terminal of the second rectifier circuit is connected to the second terminal of the second drive circuit. The second terminal of the second rectifier circuit is connected to the boost circuit.

3. The subsurface pipe detection signal launch device of claim 2, wherein, The first driving circuit includes a first field-effect transistor and a second field-effect transistor. The gates of the first field-effect transistor and the second field-effect transistor are connected to the signal transmitting module. The source of the first field-effect transistor and the drain of the second field-effect transistor are connected to the first rectifier circuit. The drain of the first field-effect transistor is connected to a 5V power supply, and the source of the second field-effect transistor is grounded.

4. The subsurface pipe detection signal launch device of claim 3, wherein, The first rectifier circuit includes: a first inductor and a first capacitor. The first end of the first inductor is connected to the gate of the first field-effect transistor and the gate of the second field-effect transistor. The second end of the first inductor is connected to the boost circuit. The first end of the first capacitor is connected to the second end of the first inductor. The second end of the first capacitor is grounded.

5. The subsurface pipe inspection signal launch device of claim 2, wherein, The second driving circuit includes a third field-effect transistor and a fourth field-effect transistor. The gates of the third and fourth field-effect transistors are connected to the signal transmitting module. The source and drain of the third and fourth field-effect transistors are connected to the second rectifier circuit. The drain of the third field-effect transistor is connected to a 5V power supply, and the source of the fourth field-effect transistor is grounded.

6. The subsurface pipe detection signal launch device of claim 5, wherein, The second rectifier circuit includes: a second inductor and a second capacitor. The first end of the second inductor is connected to the gate of the third field-effect transistor and the gate of the fourth field-effect transistor. The second end of the second inductor is connected to the boost circuit. The first end of the second capacitor is connected to the second end of the second inductor. The second end of the second capacitor is grounded.

7. The subsurface pipe inspection signal launch device of claim 2, wherein, The boost circuit includes a boost converter and a sampling resistor. The boost converter is used to boost the sine wave signal by 8 times. One end of the boost converter is connected to the first rectifier circuit and the second rectifier circuit respectively, and the other end of the boost converter is coupled to the pipeline under test through the sampling resistor.

8. The subsurface pipe inspection signal launch device of claim 7, wherein, The sampling circuit comprises a first amplification circuit; The first amplification circuit comprises a first operational amplifier, a thirteenth resistor, a first resistor, a second resistor and a third resistor, a first end of the first operational amplifier is connected with a first end of the sampling resistor through the thirteenth resistor, a second end of the first operational amplifier is connected with a second end of the sampling resistor through the first resistor, a third end of the first operational amplifier is connected with a second end of the first operational amplifier through the second resistor, the third end of the first operational amplifier is connected with the signal transmitting module, one end of the third resistor is connected with the first end of the first operational amplifier, and the other end of the third resistor is grounded.

9. The subsurface pipe inspection signal launch device of claim 7, wherein, The sampling circuit comprises a second amplification circuit; The second amplification circuit comprises a second operational amplifier, a tenth resistor, a ninth resistor, an eleventh resistor and a twelfth resistor, a first end of the second operational amplifier is connected with one end of the sampling resistor through the tenth resistor, a second end of the second operational amplifier is grounded through the ninth resistor, a third end of the second operational amplifier is connected with the second end of the second operational amplifier through the eleventh resistor, the third end of the second operational amplifier is connected with the signal transmitting module, one end of the twelfth resistor is connected with the first end of the second operational amplifier, and the other end of the twelfth resistor is grounded.

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