A voltage-adjustable pulsed ultrasonic transmitting circuit and detection device

Abstract

The present invention discloses a voltage-adjustable pulsed ultrasonic transmitting circuit, comprising: a power supply module for providing an adjustable DC voltage to the voltage-adjustable pulsed ultrasonic transmitting circuit; a control module for generating and outputting a frequency signal and n enable signals, where n is greater than 1; a driving module including n driving circuits, each driving circuit receiving the frequency signal and the enable signal corresponding to this driving circuit, and correspondingly outputting n control signals; a pulse module including n pulse generating circuits, each pulse generating circuit receiving the control signal corresponding to this pulse generating circuit, and outputting n ultrasonic signals corresponding to the frequency under the control of the n control signals. By using the present invention, it is possible to detect a variety of different substances, and multiple locations of the substance can be detected during a single detection.

Description

Technical Field

[0001] The present invention relates to the technical field of ultrasonic, and particularly to a voltage-adjustable pulsed ultrasonic transmitting circuit and a detection device. Background Art

[0002] In existing ultrasonic detection systems for non-metallic media, general ultrasonic transmitting circuits generally adopt a trigger mode within a certain voltage range. When working, multiple external DC power supplies are required to drive pulse emission, and each transmitting circuit can only emit single-channel ultrasonic pulse signals. Therefore, the types of substances that can be detected by the ultrasonic transmitting circuits in the prior art are relatively limited, and the range of substances detected at one time is also relatively small. Each time, detection can only be performed at a certain point of the substance, and detection cannot be performed at multiple points of the substance. In practical applications, in order to increase the intensity of ultrasonic signals, the trigger voltage often needs to be increased to a higher level. However, a higher trigger voltage not only brings insecurity to the entire transmitting circuit, but also has a certain impact on the generated pulse signals. Moreover, long-term operation under high voltage conditions causes greater losses to the circuit, resulting in problems in the transmitting circuit, and these problems are not easily detected. At the same time, the distortion of the pulse signals generated under high voltage operation is relatively large, which is not conducive to analyzing the internal conditions of substances by collecting data. Summary of the Invention

[0003] In view of this, an object of the present invention is to provide a voltage-adjustable pulsed ultrasonic transmitting circuit and a detection device, which can detect a variety of different substances and can detect multiple points of a substance during a single detection.

[0004] To achieve the above object, the present invention provides a voltage-adjustable pulsed ultrasonic transmitting circuit, comprising:

[0005] A power supply module, which provides an adjustable DC voltage for the voltage-adjustable pulsed ultrasonic transmitting circuit;

[0006] A control module, which generates and outputs a frequency signal and n enable signals, where n is greater than 1;

[0007] A driving module, comprising n driving circuits. Each driving circuit receives the frequency signal and the enable signal corresponding to this driving circuit, and correspondingly outputs n control signals;

[0008] A pulse module, comprising n pulse generating circuits. Each pulse generating circuit receives the control signal corresponding to this pulse generating circuit, and outputs n ultrasonic signals corresponding to the frequency under the control of the n control signals.

[0009] Preferably, the adjustable range of the DC voltage is 30 - 500V.

[0010] Preferably, the device further includes a first step-down module and a second step-down module, wherein,

[0011] The first step-down module is configured to step down the DC voltage input by the power supply module to a first voltage and output the first voltage to the second step-down module;

[0012] The second step-down module is configured to step down the first voltage, and the output voltage after stepping down meets the input voltage range of the control module and the drive module.

[0013] Preferably, the device further includes a processing module, connected to the first step-down module, receiving the first voltage output by the first step-down module, comparing the first voltage with a preset voltage threshold, and outputting an alarm message if the first voltage is not within the range of the voltage threshold.

[0014] Preferably, the device further includes a display module, connected to the processing module, for displaying an alarm message when the first voltage is not within the range of the voltage threshold.

[0015] Preferably, the device further includes a buzzer module and a lighting module, for outputting a buzzer alarm message and a lighting alarm message when the first voltage is not within the range of the voltage threshold.

[0016] Preferably, the device further includes an isolation module, respectively connected to the control module and the drive module, for isolating the frequency signal and the n-channel enable signals output by the control module and sending the isolated frequency signal and the n-channel enable signals to the drive module.

[0017] Preferably, each drive circuit includes a first drive chip, a second drive chip and an inverter, and each pulse generation circuit includes a first MOS transistor, a second MOS transistor, a third MOS transistor and a fourth MOS transistor, wherein,

[0018] The first-channel enable signal is respectively connected to the enable input terminal of the first drive chip and the enable input terminal of the second drive chip U7;

[0019] The frequency signal is connected to the first input terminal of the first drive chip, and the frequency signal is connected to the first input terminal of the second drive chip through the inverter;

[0020] The first output voltage signal output by the first output terminal of the first drive chip is connected to the gate of the first MOS transistor, and the second output voltage signal output by the second output terminal of the first drive chip U6 is connected to the gate of the third MOS transistor;

[0021] The third output voltage signal output from the first output terminal of the second driving chip is connected to the gate of the second MOS transistor, and the fourth output voltage signal output from the second output terminal of the second driving chip is connected to the gate of the fourth MOS transistor;

[0022] The first output voltage signal and the second output voltage signal control the on / off states of the first MOS transistor and the third MOS transistor, and output an ultrasonic positive pulse signal;

[0023] The third output voltage signal and the fourth output voltage signal control the on / off states of the second MOS transistor and the fourth MOS transistor, and output an ultrasonic negative pulse signal;

[0024] The ultrasonic positive pulse signal is connected to the second input terminal of the first driving chip, and the ultrasonic negative pulse signal is connected to the second input terminal of the second driving chip.

[0025] Preferably, the pulse generating circuit further includes an absorption circuit, and the absorption circuit includes a resistor, a capacitor and a diode, wherein,

[0026] One end of the resistor is connected to the source electrode of the third MOS transistor, and the other end is connected to one end of the capacitor;

[0027] The other end of the capacitor is connected to the drain electrode of the third MOS transistor Q5;

[0028] The diode is connected in parallel with the resistor.

[0029] Preferably, the control module further includes a setting unit for setting the control module to output the n enable signals simultaneously.

[0030] To achieve the above object, the present invention provides an ultrasonic detection device, including the voltage-adjustable pulsed ultrasonic transmitting circuit, a receiving device and an analysis module as described above, wherein,

[0031] The voltage-adjustable pulsed ultrasonic transmitting circuit is used to output corresponding n ultrasonic transmitting signals;

[0032] The receiving device is used to receive n ultrasonic echo signals after the n ultrasonic transmitting signals pass through the non-metallic medium to be detected;

[0033] The analysis module is used to analyze the n ultrasonic echo signals to obtain the detection result of the non-metallic medium to be detected.

[0034] Compared with the prior art, the present invention provides a voltage-adjustable pulsed ultrasonic transmitting circuit and a detection device, and the beneficial effects brought are as follows: The ultrasonic transmitting circuit realizes the detection of various different substances, can detect multiple locations of the substance during a single detection, expands the detection range, and can perform substance detection more effectively; the pulsed transmitting device is easy to operate and the circuit design is simple; in the design of the pulsed ultrasonic transmitting circuit, the input DC power supply is stepped down multiple times to reduce the power loss of the high voltage on the circuit, and the voltage is monitored to output a voltage alarm message, ensuring the safety during the use of the circuit; the signal is isolated to ensure that the main control chip is not damaged; the overshoot generated at the moment of conduction and cutoff of each pulse signal is absorbed through an absorption circuit to ensure the performance of the signal; the pulse signals of each channel are independent of each other and do not affect each other, and various output modes such as serial and parallel of the pulse signals can be realized. Description of the Drawings

[0035] Figure 1 is a system schematic diagram of a voltage-adjustable pulsed ultrasonic transmitting circuit in an embodiment of the present invention.

[0036] Figure 2 is a system schematic diagram of the transmitting circuit in an embodiment of the present invention.

[0037] Figure 3 is a circuit schematic diagram of the driving circuit in an embodiment of the present invention.

[0038] Figure 4 is a circuit schematic diagram of the pulse generation circuit in an embodiment of the present invention. Detailed Embodiments

[0039] The present invention will be described in detail below in conjunction with the specific embodiments shown in the drawings, but these embodiments do not limit the present invention, and any structural, method, or functional transformation made by those of ordinary skill in the art based on these embodiments is included in the protection scope of the present invention.

[0040] As Figure 1 shown in an embodiment of the present invention, the present invention provides a voltage-adjustable pulsed ultrasonic transmitting circuit, including:

[0041] A power supply module 10 that provides an adjustable DC voltage for the voltage-adjustable pulsed ultrasonic transmitting circuit;

[0042] A control module 11 that generates and outputs a frequency signal and n enable signals, where n is greater than 1;

[0043] A driving module 12 that includes n driving circuits, each driving circuit receives the frequency signal and the enable signal corresponding to this driving circuit, and correspondingly outputs n control signals;

[0044] The pulse module 13 includes n pulse generation circuits. Each pulse generation circuit receives a control signal corresponding to that circuit and outputs n ultrasonic signals corresponding to the frequency under the control of the n control signals.

[0045] The power supply module supplies power to the voltage adjustable pulse ultrasonic transmitting circuit. The power supply is a DC power supply. This DC power supply provides an adjustable DC voltage to the voltage adjustable pulse ultrasonic transmitting circuit. To ensure the simplicity of the circuit, the voltage adjustable pulse ultrasonic transmitting circuit is only externally connected to one DC power supply. This power supply is a DC power supply with adjustable voltage. Its voltage adjustable range is 30 - 500V. The DC power supply provides a pulse voltage to the pulse generation module. When using ultrasonic to detect substances, different substances require different pulse voltages, some need high voltages and some need low voltages. In this embodiment, a DC power supply with a wide range of adjustable voltage is used to supply power to the voltage adjustable pulse ultrasonic transmitting circuit, which can generate a wide range of pulse wave voltages and has pulses of various voltages, enabling the detection of a variety of different substances and expanding the range of detected substance types.

[0046] As Figure 2 In an embodiment of the present invention as shown, the device further includes a first step - down module 14 and a second step - down module 15. The first step - down module 14 is used to step down the DC voltage input by the power supply module to a first voltage and output this first voltage to the second step - down module 15. The second step - down module 15 is used to step down the first voltage, and the output voltage after stepping down meets the input voltage range of the control module and the drive module. The first step - down module and the second step - down module step down the input DC voltage to meet the working voltages of each module. Since the DC power supply input to the first step - down module is a high voltage, it will consume a large amount of power in the long - term working condition and is likely to damage the step - down chip in the module. Therefore, the step - down chip selected in the first step - down module has a wide range of input voltages and its output voltage has a certain adjustable range. Similarly, the step - down chip in the second step - down module has the same function. Since the step - down chips all have a wide range of input voltages, it avoids the damage to other module circuits due to the unsuccessful step - down of the first step - down module in case of abnormal situations. At the same time, adopting the technical solution of two - stage step - down, in the case where the first step - down chip is broken down, it will not have a great impact on the operation of the entire circuit, and this circuit can still work normally.

[0047] As Figure 2In an embodiment of the present invention as shown, the device further includes a processing module 16, which is connected to the first buck module 14, receives the first voltage output by the first buck module 14, compares the first voltage with a preset voltage threshold, and outputs an alarm message if the first voltage is not within the range of the voltage threshold. Specifically, the processing module includes a single-chip microcomputer chip and an analog-to-digital conversion chip, converts the first voltage into a first digital voltage signal through the analog-to-digital conversion chip and outputs it to the single-chip microcomputer chip, and the single-chip microcomputer chip compares the first digital voltage signal with the preset voltage threshold. If the first digital voltage signal is not within the range of the voltage threshold, an alarm message is output. The voltage of the first voltage output by the first buck module is monitored by the processing module to ensure the normal operation of the circuit and timely detect the voltage problem of the circuit.

[0048] According to a specific embodiment of the present invention, the device further includes a display module, which is connected to the processing module and is used to display an alarm message when the first voltage is not within the range of the voltage threshold. The display module can display the alarm message through an LCD display screen to timely remind the user that there is a problem with the voltage of the circuit. The device further includes a buzzer module and a lighting module, which are used to output a buzzer alarm message and a lighting alarm message when the first voltage is not within the range of the voltage threshold to prompt the user that the current voltage is abnormal and needs to be checked in time.

[0049] The control module outputs a frequency signal and n enable signals to the driving module. The control module includes an FPGA (Field-Programmable Gate Array) chip, and the frequency signal and n enable signals are output through programming control by the FPGA. This frequency signal is an ultrasonic frequency. A variety of different frequency signals can be output through the FPGA chip, so as to meet the detection requirements for different types of substances. Each enable signal is used to control the on and off of each driving circuit. Specifically, when the enable signal is at a high level, the corresponding driving circuit works normally; when the enable signal is at a low level, the corresponding driving circuit is in a closed state and cannot work.

[0050] The voltage required for the FPGA chip of the control module is generally about a few volts, while the voltage required for the ultrasonic pulse generation circuit is set to several tens of volts or several hundreds of volts. To avoid abnormal high voltage phenomena during the operation of the ultrasonic emission device and prevent the high voltage from flowing to the FPGA chip of the control module, which may cause damage to the main FPGA chip, according to a specific embodiment of the present invention, the device further includes an isolation module 17, which is respectively connected to the control module and the drive module, and is used to isolate the frequency signal and n enable signals output by the control module, and send the isolated frequency signal and n enable signals to the drive module. Specifically, the isolation module includes an optocoupler, through which the frequency signal and the enable signal are isolated, thus ensuring the normal operation of the chip of the control module, protecting the chip of the control module from damage, and enhancing the durability of the circuit operation.

[0051] The drive module includes n drive circuits. Each drive circuit receives the frequency signal and the enable signal corresponding to this drive circuit, and correspondingly outputs n control signals. The pulse generation module includes n pulse generation circuits. Each pulse generation circuit receives the control signal corresponding to this pulse generation circuit, and outputs an ultrasonic signal corresponding to the frequency under the control of the control signal. Each drive circuit is connected to the corresponding pulse generation circuit. Specifically, when the enable signal is at a high level, the normal operation of the drive circuit is controlled by the enable signal, the frequency signal is used as the input signal of this drive circuit, the drive circuit outputs a control signal, and this control signal controls the corresponding pulse generation circuit to output an ultrasonic signal.

[0052] Taking one drive circuit and the corresponding pulse generation circuit as an example for detailed description, as Figure 3 and Figure 4As shown. The drive circuit includes a first drive chip U6, a second drive chip U7, and an inverter U10. The pulse generation circuit includes a first MOS transistor Q1, a second MOS transistor Q2, a third MOS transistor Q5, and a fourth MOS transistor Q6. The first enable signal EN_1_IN is respectively connected to the enable input terminal SD of the first drive chip U6 and the enable input terminal SD of the second drive chip U7. The frequency signal 50KHZ_IN is connected to the first input terminal IN of the first drive chip U6. The frequency signal 50KHZ_IN is connected to the first input terminal IN of the second drive chip U7 through the inverter U10. The first output voltage signal HO1_1 output by the first output terminal HO of the first drive chip U6 is connected to the gate of the first MOS transistor Q1. The second output voltage signal LO1_1 output by the second output terminal LO of the first drive chip U6 is connected to the gate of the third MOS transistor Q5. The third output voltage signal HO2_1 output by the first output terminal HO of the second drive chip U7 is connected to the gate of the second MOS transistor Q2. The fourth output voltage signal LO2_1 output by the second output terminal LO of the second drive chip U7 is connected to the gate of the fourth MOS transistor Q6. The first output voltage signal HO1_1 and the second output voltage signal LO1_1 control the on and off of the first MOS transistor Q1 and the third MOS transistor Q5, and output an ultrasonic positive pulse signal HS1_1. The third output voltage signal HO2_1 and the fourth output voltage signal LO2_1 control the on and off of the second MOS transistor Q2 and the fourth MOS transistor Q6, and output an ultrasonic negative pulse signal HS2_2. The ultrasonic positive pulse signal HS1_1 is connected to the second input terminal VS of the first drive chip U6. The ultrasonic negative pulse signal HS2_2 is connected to the second input terminal VS of the second drive chip U7. The MOS transistors Q1, Q2, Q5, and Q6 form an H-bridge circuit. These four MOS transistors and the drive chips U6 and U7 form a full-bridge drive circuit. Through this circuit, when the enable signal is at a high level, the drive chips work normally, output voltage signals to the gates of the MOS transistors, alternately control the conduction and cutoff of the MOS transistors, and form an H-bridge through the bootstrap drive method, outputting a positive and negative ultrasonic pulse signal. The four MOS transistors and the two drive chips form a pulse emission circuit for one channel. By analogy, a pulse emission circuit for n channels can be formed. The pulse generation circuit of each channel can output ultrasonic signals with a wide range of voltages. The ultrasonic signals between each channel are independent of each other and do not affect each other, thus realizing the detection of multiple locations of the same substance during a single detection.

[0053] According to a specific embodiment of the present invention, the pulse generation circuit further includes an absorption circuit, and the absorption circuit includes a resistor R41, a capacitor C36, and a diode D12. Wherein, one end of the resistor R41 is connected to the source electrode of the third MOS transistor Q5, and the other end is connected to one end of the capacitor C36; the other end of the capacitor C36 is connected to the drain electrode of the third MOS transistor Q5; the diode D12 is connected in parallel with the resistor R41. Similarly, the fourth MOS transistor is also externally connected to the same absorption circuit. Most of the overshoot generated at the moment when the MOS transistor is turned on and off is absorbed by this absorption circuit.

[0054] According to a specific embodiment of the present invention, the control module further includes a parallel setting unit, which is used to set the control module to output the n enable signals to the n driving circuits at the same time. By setting the n enable signals to be output simultaneously, the n driving circuits are turned on or off simultaneously, and the n ultrasonic signals are output simultaneously, so that the voltage adjustable pulse ultrasonic transmitting circuit operates in a parallel mode.

[0055] According to another specific embodiment of the present invention, the control module further includes a serial setting unit. The serial setting unit is used to set the first enable signal as a valid enable signal and output it to the first driving circuit, and after a preset time interval, set the second enable signal as a valid signal and output it to the second driving circuit, and after the time interval, set the third enable signal as a valid signal and output it to the third driving circuit, and so on, set the nth enable signal as a valid signal and output it to the nth driving circuit. Through this embodiment, each enable signal is sequentially set as a valid signal, the corresponding driving circuits are sequentially turned on, and the n ultrasonic signals are sequentially output, so that the ultrasonic transmitting device operates in a serial mode.

[0056] According to an embodiment of the present invention, the present invention provides an ultrasonic detection device, including the voltage adjustable pulse ultrasonic transmitting circuit, a receiving device, and an analysis module as described above. Wherein, the voltage adjustable pulse ultrasonic transmitting circuit is used to output corresponding n ultrasonic transmitting signals; the receiving device is used to receive n ultrasonic echo signals after the n ultrasonic transmitting signals pass through the non-metallic medium to be detected; the analysis module is used to analyze the n ultrasonic echo signals to obtain the detection result of the non-metallic medium to be detected.

[0057] Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those of ordinary skill in the art will realize that various improvements, additions, and substitutions are possible without departing from the scope and spirit of the present invention disclosed by the appended claims.

Claims

1. A voltage-adjustable pulsed ultrasonic transmitting circuit, characterized in that, Comprising: A power supply module that provides an adjustable DC voltage for the voltage-adjustable pulsed ultrasonic transmitting circuit; A control module that generates and outputs a frequency signal and n enable signals, where n>1; A driving module that includes n driving circuits. Each driving circuit receives the frequency signal and the enable signal corresponding to this driving circuit, and correspondingly outputs n control signals; A pulse module that includes n pulse generation circuits. Each pulse generation circuit receives the control signal corresponding to this pulse generation circuit, and outputs n ultrasonic signals corresponding to the frequency under the control of the n control signals; Wherein, Each of the driving circuits includes a first driving chip and a second driving chip. Each of the pulse generation circuits includes a first MOS transistor, a second MOS transistor, a third MOS transistor, and a fourth MOS transistor. The first driving chip, the second driving chip, the first MOS transistor, the second MOS transistor, the third MOS transistor, and the fourth MOS transistor constitute a full-bridge driving circuit to output one ultrasonic signal; The pulse generation circuit further includes an absorption circuit. The absorption circuit includes a resistor, a capacitor, and a diode. Wherein, one end of the resistor is connected to the source electrode of the third MOS transistor, the other end is connected to one end of the capacitor, the other end of the capacitor is connected to the drain electrode of the third MOS transistor Q5, and the diode is connected in parallel with the resistor.

2. The voltage-adjustable pulsed ultrasonic transmitting circuit according to claim 1, wherein The adjustable range of the DC voltage is 30~500V.

3. The voltage-adjustable pulse ultrasonic transmitting circuit according to claim 1, wherein The circuit further includes a first step-down module and a second step-down module. Wherein, The first step-down module is used to step down the DC voltage input by the power supply module to a first voltage and output the first voltage to the second step-down module; The second step-down module is used to step down the first voltage, and the output voltage after step-down meets the input voltage range of the control module and the driving module.

4. The voltage-adjustable pulse ultrasonic transmitting circuit according to claim 3, characterized in that, The circuit further includes a processing module, which is connected to the first step-down module, receives the first voltage output by the first step-down module, and compares the first voltage with a preset voltage threshold. If the first voltage is not within the range of the voltage threshold, an alarm message is output.

5. The voltage-adjustable pulse ultrasonic transmitting circuit according to claim 4, wherein, The circuit further includes a display module, which is connected to the processing module and is used to display an alarm message when the first voltage is not within the range of the voltage threshold.

6. The voltage-adjustable pulse ultrasonic transmitting circuit according to claim 4, wherein The circuit further includes a buzzer module and a lighting module, which are used to output a buzzer alarm message and a lighting alarm message when the first voltage is not within the range of the voltage threshold.

7. The voltage-adjustable pulsed ultrasonic transmitting circuit according to claim 1, characterized in that, The circuit further includes an isolation module, which is respectively connected to the control module and the driving module, and is used to isolate the frequency signal and n enable signals output by the control module, and send the isolated frequency signal and n enable signals to the driving module.

8. The voltage-adjustable pulse ultrasonic transmitting circuit according to claim 1, wherein, Each of the driving circuits includes an inverter. Wherein, The first enable signal is respectively connected to the enable input terminal of the first driving chip and the enable input terminal of the second driving chip U7; The frequency signal is connected to the first input terminal of the first driving chip, and the frequency signal is connected to the first input terminal of the second driving chip through the inverter; The first output voltage signal output by the first output terminal of the first driving chip is connected to the gate of the first MOS transistor, and the second output voltage signal output by the second output terminal of the first driving chip is connected to the gate of the third MOS transistor; The third output voltage signal output by the first output terminal of the second driving chip is connected to the gate of the second MOS transistor, and the fourth output voltage signal output by the second output terminal of the second driving chip is connected to the gate of the fourth MOS transistor; The first output voltage signal and the second output voltage signal control the on / off of the first MOS transistor and the third MOS transistor, and output an ultrasonic positive pulse signal; The third output voltage signal and the fourth output voltage signal control the on / off of the second MOS transistor and the fourth MOS transistor, and output an ultrasonic negative pulse signal; The ultrasonic positive pulse signal is connected to the second input terminal of the first driving chip, and the ultrasonic negative pulse signal is connected to the second input terminal of the second driving chip.

9. An ultrasonic detection device, characterized in that, It includes a voltage adjustable pulse ultrasonic transmitting circuit, a receiving device and an analysis module according to any one of claims 1-8, wherein, The voltage adjustable pulse ultrasonic transmitting circuit is used to output corresponding n-way ultrasonic transmitting signals; The receiving device is used to receive n-way ultrasonic echo signals after the n-way ultrasonic transmitting signals pass through the non-metallic medium to be detected; The analysis module is used to analyze the n-way ultrasonic echo signals to obtain the detection result of the non-metallic medium to be detected.

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