CN214845813U - Pipeline instrument transmitter - Google Patents
Pipeline instrument transmitter Download PDFInfo
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- CN214845813U CN214845813U CN202120135447.5U CN202120135447U CN214845813U CN 214845813 U CN214845813 U CN 214845813U CN 202120135447 U CN202120135447 U CN 202120135447U CN 214845813 U CN214845813 U CN 214845813U
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Abstract
The utility model discloses a pipeline instrument transmitter, which comprises a main control circuit, a signal generating and amplifying circuit, a detection circuit, a man-machine interaction interface module and an interface, wherein the signal generating and amplifying circuit comprises a waveform generating circuit, a signal conditioning circuit, a power amplifying circuit and a control output circuit; the main control circuit is respectively connected with the human-computer interaction interface module, the waveform generating circuit, the output voltage detecting circuit and the output current detecting circuit, the waveform generating circuit, the signal conditioning circuit, the power amplifying circuit and the control output circuit are sequentially connected, and the signal output interface is respectively connected with the control output circuit, the output voltage detecting circuit and the output current detecting circuit. The utility model provides the high pipeline detection precision of pipeline appearance transmitter has reduced the consumption of transmitter, has increased its time of endurance.
Description
Technical Field
The utility model relates to an underground metal pipeline surveys the field, especially a pipeline appearance transmitter.
Background
Along with the rapid development of urban infrastructure, the distribution of underground pipeline network is becoming more and more complicated, and partial pipeline drawing archives are lacked, bring very big inconvenience for pipeline maintenance, maintenance work, promoted the construction risk of new capital construction simultaneously, consequently need a equipment to be used for exploring trend, the degree of depth of underground pipeline, the underground pipeline detection instrument is born in charge of.
The pipeline instrument utilizes the electromagnetic induction principle to realize the underground pipeline detection function and consists of a transmitter and a receiver. The transmitter couples sine wave signals with fixed frequency and amplitude to a target pipeline to generate a variable magnetic field around the pipeline, and the receiver restores a plurality of sine wave signals with the same frequency and weaker amplitude from the magnetic field through a plurality of groups of coils and converts the sine wave signals into position information of the target pipeline after processing. In the process, the magnetic field intensity around the pipeline and the stability of the change period are positively correlated with the detection precision and efficiency of the receiver.
The output intensity of the transmitter of the existing pipeline instrument takes the output voltage and the power as set values of the output intensity, in order to improve the continuous working time, the transmitter usually selects proper output intensity to ensure the normal receiving of a receiver and consider low power consumption, but the impedance of a pipeline may change due to environmental change, so when the output voltage and the power are used as the set values of the output intensity, when the impedance becomes small, the alternating current of the pipeline increases, the magnetic field intensity around the pipeline increases according to the magnetic effect of the current, and partial power consumption is wasted due to the setting above; similarly, when the impedance becomes higher, the signal becomes smaller, which may cause the receiver to fail to receive the signal normally. Meanwhile, when the same output intensity is connected to the pipelines with different impedances, the magnetic field intensity around the pipelines is different due to different pipeline currents, and a user needs to repeatedly try to set the output intensity when the user is connected to the pipelines each time. Therefore, a new output intensity control method is required to achieve stable output of signals. The signal output intensity of the transmitter of the existing pipeline instrument is calculated by a voltage value, and the impedance of a target pipeline is not constant, so that the magnetic field generated by the target pipeline is unstable, and the pipeline detection precision of the whole system of the pipeline instrument is reduced; when the pipeline impedance becomes small, the power consumption of the transmitter is also increased, and the endurance time of the transmitter is reduced. The present invention is designed to solve these problems.
Disclosure of Invention
The utility model aims to solve the technical problem that overcome prior art not enough and provide a pipeline appearance transmitter, the utility model provides the high pipeline detection precision of pipeline appearance transmitter has reduced the consumption of transmitter, has increased its duration.
The utility model discloses a solve above-mentioned technical problem and adopt following technical scheme:
according to the utility model provides a pipeline appearance transmitter, including master control circuit, signal generation amplifier circuit, detection circuitry, man-machine interaction interface module and interface, signal generation amplifier circuit includes waveform generation circuit, signal conditioning circuit, power amplifier circuit and control output circuit, and detection circuitry includes output voltage detection circuitry and output current detection circuitry, and the interface includes power source and signal output interface; wherein the content of the first and second substances,
the main control circuit is respectively connected with the human-computer interaction interface module, the waveform generating circuit, the output voltage detecting circuit and the output current detecting circuit, the waveform generating circuit, the signal conditioning circuit, the power amplifying circuit and the control output circuit are sequentially connected, and the signal output interface is respectively connected with the control output circuit, the output voltage detecting circuit and the output current detecting circuit.
As the further optimization scheme of the pipeline instrument transmitter, the pipeline instrument transmitter further comprises a power supply, wherein the power supply is respectively connected with the human-computer interaction interface module, the main control circuit and the signal generation amplifying circuit, and comprises a battery, a battery output control circuit and a power supply processing circuit which are sequentially connected in sequence; the battery is connected with the power interface.
As a further optimization scheme of pipeline appearance transmitter, man-machine interaction module includes display screen, bee calling organ and button, display screen, bee calling organ, button respectively with master control circuit connection.
As a further optimization scheme of pipeline appearance transmitter, power amplification circuit includes D class amplifier, low frequency transformer, AB class amplifier and high frequency transformer, D class amplifier is connected with low frequency transformer, AB class amplifier and high frequency transformer are connected.
The utility model adopts the above technical scheme to compare with prior art, have following technological effect:
the utility model discloses an output strength can be adjusted in real time according to the impedance change of target pipeline, makes the electric current of target pipeline invariable to the magnetic field that makes the target pipeline produce remains stable, has guaranteed detection precision, stability and the time of endurance of pipeline appearance system.
Drawings
Fig. 1 is a hardware circuit architecture of a pipeline instrument transmitter.
Fig. 2 is a block diagram of a power supply circuit.
Fig. 3 is a block diagram of a signal generating amplifying circuit.
Fig. 4 is a block diagram of a detection circuit.
Detailed Description
The technical scheme of the utility model is further explained in detail with the attached drawings as follows:
fig. 1 shows the general architecture of the hardware circuit of the present invention. A pipeline instrument transmitter comprises a main control circuit, a signal generating and amplifying circuit, a detection circuit, a man-machine interaction interface module and an interface, wherein the signal generating and amplifying circuit comprises a waveform generating circuit, a signal conditioning circuit, a power amplifying circuit and a control output circuit; wherein the content of the first and second substances,
the main control circuit is respectively connected with the human-computer interaction interface module, the waveform generating circuit, the output voltage detecting circuit and the output current detecting circuit, the waveform generating circuit, the signal conditioning circuit, the power amplifying circuit and the control output circuit are sequentially connected, and the signal output interface is respectively connected with the control output circuit, the output voltage detecting circuit and the output current detecting circuit.
The power supply is respectively connected with the human-computer interaction interface module, the main control circuit and the signal generation amplifying circuit, and comprises a battery, a battery output control circuit and a power supply processing circuit which are sequentially connected; the battery is connected with the power interface.
The man-machine interaction module comprises a display screen, a buzzer and a key, and the display screen, the buzzer and the key are respectively connected with the main control circuit.
The main control circuit is used for acquiring a key signal in the man-machine interaction module, the battery voltage of the power supply and a low-voltage direct-current signal output by the detection circuit, and controlling the on-off state of the battery output control circuit, the content of a display screen in the man-machine interaction module, the sound of the buzzer and the amplitude and frequency of a sine wave signal output by the signal generation amplification circuit;
a waveform generation circuit: the DDS is used for receiving the digital signals of the main control circuit, generating sine wave signals with five frequencies through the DDS and outputting the sine wave signals to the signal conditioning circuit;
the signal conditioning circuit: the power amplifier circuit is used for filtering, gain amplifying and sending the sine wave signal output by the waveform generating circuit to the power amplifier circuit;
a power amplification circuit: the sine wave signal output by the signal conditioning circuit is subjected to power amplification and output to the control output circuit;
the control output circuit: the power amplification circuit is used for outputting five frequency sine wave signals to the signal output interface;
a power interface: for charging the battery;
a signal output interface: the sine wave signal output by the signal generating and amplifying circuit is sent to a target pipeline and is connected to the detection circuit;
output voltage detection circuit: the sine wave signal of the signal output interface is converted into a low-voltage direct current signal through RMS-DC and is output to the main control circuit;
output current detection circuit: and the sine wave signal is used for converting the sine wave signal of the signal output interface into a low-voltage direct current signal through RMS-DC and outputting the low-voltage direct current signal to the main control circuit.
And the battery is used for outputting 12V power to the battery output control circuit and receiving charging through the power interface.
The battery output control circuit is used for receiving the digital signal of the main control circuit and changing the on-off state of an MOS switch in the circuit, namely controlling the on-off state between the battery and the power supply processing circuit;
and the power supply processing circuit is used for boosting and reducing the voltage of the power supply output by the battery output control circuit and outputting the power supply to the power amplification circuit, the signal conditioning circuit and the main control circuit.
The display screen is used for receiving the digital signal of the main control circuit and changing the display content;
the key is used for sending a low level signal to the IO corresponding to the main control circuit according to the corresponding key pressed by the user;
and the buzzer is used for receiving the digital signal of the main control circuit and making sound.
The utility model discloses a power, master control circuit, signal produce amplifier circuit, detection circuitry, human-computer interaction module and interface. The transmitter adjusts and outputs the signal output amplitude and frequency through the keys, the signal is connected to a target pipeline through the signal output interface, the detection circuit detects the signal output current in real time, when the impedance of the target pipeline changes, the signal output current changes, the main control circuit automatically changes the signal output amplitude at the moment, the signal output current is restored to the value before changing, and therefore the magnetic field generated by the target pipeline is kept stable.
The power supply supplies power to each power utilization module; the main control circuit controls the output frequency and the output intensity of the transmitter according to the state of the keys, collects the voltage of each node of the circuit in real time, converts the voltage into data such as battery capacity, output voltage, output power, output current, pipeline impedance and the like, and displays the data to a user through a display screen; the signal generating and amplifying circuit is responsible for outputting sine wave signals with specified frequency and amplitude; the detection circuit converts the high-voltage alternating current signal output to the target pipeline into a low-voltage direct current signal which can be detected by the singlechip; the interface is used for charging and accessing a target pipeline; the man-machine interaction module provides state display, operation configuration interface and sound feedback for a user.
1. Power supply
The power supply comprises a battery, a battery output control circuit and a power supply processing circuit, and the circuit block diagram is shown in figure 2. The battery is provided with 12V direct current power supply by a lithium battery; the battery output control circuit controls the battery output access switch according to the key state and keeps the battery output access switch through the main control circuit; the power supply processing circuit outputs 24V, +/-5V and 3.3V power supplies after voltage boosting and voltage reducing processing, the power supplies respectively supply power for the power amplification circuit, the operational amplifier chip and the digital circuit, meanwhile, the 24V and +/-5V power supply output can be controlled through the main control circuit, and the corresponding output power supply is turned on as required to reduce the power consumption of equipment.
2. Master control circuit
The main control circuit consists of an MCU and a peripheral circuit. The MCU selects STM32F103 series chips of ST company and has 12-bit ADC detection capability. The main control circuit is mainly responsible for:
1) adjusting the output frequency and power of the transmitter by clicking a key;
2) the voltage of each node of the circuit is collected in real time and converted into data such as battery capacity, residual voltage, output current, pipeline insulation resistance and the like, and the data is displayed to a user through a display screen;
3) and dynamically adjusting the output intensity of the transmitter according to the impedance change of the target pipeline to ensure that the alternating current of the target pipeline is constant.
3. Man-machine interaction module
The man-machine interaction module consists of a display screen, a key and a buzzer. The display screen is a low-power-consumption segment code or dot matrix LCD screen; aiming at the characteristic of much mud dust on the working site of equipment, the keys are thin film keys with good dustproof performance, and the keys have 7 functional keys of 'power supply', 'detection', 'output', 'mode', 'frequency', 'power up' and 'power down'; the buzzer selects a high-decibel active piezoelectric buzzer to provide sound feedback for a user.
4. Signal generating and amplifying circuit
The signal generating and amplifying circuit is an important circuit for determining the performance of the pipeline instrument, and the circuit block diagram of the signal generating and amplifying circuit is shown in fig. 3 and mainly comprises circuits for waveform generation, signal processing, power amplification, control output and the like.
The waveform generation circuit adopts two schemes simultaneously: shaping and filtering the PWM wave output by the main control circuit to output a sine wave; the master control circuit controls the DDS to generate sine waves of various frequencies required by the transmitter. The two channels can realize the superposition output of two waveforms after being switched on by the analog switch.
The signal processing circuit filters and amplifies sine wave signals, adopts 256-bit digital potentiometer for amplitude modulation, changes the signal input voltage of the power amplification circuit, and accordingly adjusts the output power of the transmitter.
The power amplification circuit adopts a D-class amplifier and an AB-class amplifier which are complementary and respectively matched with a low-frequency transformer and a high-frequency transformer for boosting output. Two AB class power amplifier chips are used, and the push-pull mode of BTL is adopted, so that the output voltage and the power are doubled, the working temperature and the power consumption of a single chip are greatly reduced, and the high-temperature environment adaptability of a transmitter is improved; the class-D power amplifier chip has a BTL output function and is realized through external resistor configuration, and output voltage is improved. The output frequency of the class D amplifier is audio, the amplification efficiency is high, and the class D amplifier is responsible for power amplification of 480Hz and 7.7kHz frequency signals; the AB class amplifier has high output frequency and slightly lower amplification efficiency than the D class amplifier and is responsible for power amplification of frequency signals of 31kHz, 61kHz and 133 kHz.
Generally, a transmitter only adopts a high-power operational amplifier to realize a power amplification function, the cost is low, the design is simple, but the output efficiency is low, the heat is concentrated, the output power is reduced along with the increase of the service time, the performance is poor, and meanwhile, a large-size radiating fin is arranged for increasing the radiating performance, so that the weight is heavy. The utility model adopts the D-type power amplifier and the audio customized power amplifier to amplify the audio signals, thereby improving the output efficiency of the audio frequency band compared with the former, having extremely small heat productivity and not needing to additionally arrange cooling fins; two groups of step-up transformers are adopted to respectively amplify signals of different frequency bands, so that the transformation efficiency of a transformer end is improved; through the two designs, the heat productivity of the device is reduced, the output efficiency of the whole machine is improved, and meanwhile, only small-size radiating fins are needed, so that the weight of the transmitter is reduced.
In the control output circuit, a relay group is adopted to control the input and output paths of each frequency signal.
5. Detection circuit
The detection circuit is composed of an output voltage detection circuit and an output current detection circuit, and the circuit block diagram is shown in fig. 4.
In the output voltage detection circuit, a sampling resistor is used for dividing and reducing the voltage of the output voltage, after impedance is converted through an operational amplifier, alternating voltage is converted into direct current voltage through an RMS-DC conversion chip, and the direct current voltage is output to a main control circuit MCU after active filtering and operational amplification.
In the output current detection circuit, a high-precision resistor with a small resistance value is connected in series into a target pipeline loop for sampling, after amplification by an operational amplifier, alternating voltage is converted into direct current voltage through an RMS-DC conversion chip, and then the direct current voltage is output to a main control circuit MCU after active filtering and operational amplification.
The high-precision RMS-DC conversion chip and the active filter circuit are adopted in the detection circuit, and compared with a detection circuit built by a pure operational amplifier, the detection precision and consistency of output voltage and current can be greatly improved, and the feasibility of using the current as an output voltage intensity control mode is ensured.
6. Interface
The power interface adopts a 2.1mm direct current power input socket. The signal output interface selects a 6.5mm TRS audio interface, and sine wave signals are transmitted to the pipeline through the injection line.
The essential purpose of controlling the strength of the transmitter output is to control the strength of the magnetic field around the pipeline, which can be indirectly controlled by controlling the alternating current of the pipeline, based on the magnetic effect of the current. The output alternating current effective value is used as the output intensity to be adjusted and transmitted, the output voltage is actively adjusted to keep the output current within the initial setting range by detecting the impedance change of the pipeline in real time, and therefore when the transmitter outputs signals to pipelines with different impedances or the impedance of the pipeline changes, the magnetic field intensity changing around the pipeline can be consistent with the expectation and keep stable. The utility model discloses well transmitter needs detection pipeline impedance, electric current, consequently only is applicable to the signal output of injection method.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention.
Claims (4)
1. A pipeline instrument transmitter is characterized by comprising a main control circuit, a signal generating and amplifying circuit, a detection circuit, a man-machine interaction module and an interface, wherein the signal generating and amplifying circuit comprises a waveform generating circuit, a signal conditioning circuit, a power amplifying circuit and a control output circuit; wherein the content of the first and second substances,
the main control circuit is respectively connected with the human-computer interaction module, the waveform generation circuit, the output voltage detection circuit and the output current detection circuit, the waveform generation circuit, the signal conditioning circuit, the power amplification circuit and the control output circuit are sequentially connected, and the signal output interface is respectively connected with the control output circuit, the output voltage detection circuit and the output current detection circuit.
2. The pipeline instrument transmitter of claim 1, further comprising a power supply, wherein the power supply is connected with the human-computer interaction module, the main control circuit and the signal generation amplification circuit respectively, and the power supply comprises a battery, a battery output control circuit and a power supply processing circuit which are sequentially connected in sequence; the battery is connected with the power interface.
3. The pipeline apparatus transmitter of claim 1, wherein the human-computer interaction module comprises a display screen, a buzzer and a key, and the display screen, the buzzer and the key are respectively connected with the main control circuit.
4. The pipeline apparatus transmitter of claim 1, wherein the power amplification circuit comprises a class D amplifier, a low frequency transformer, a class AB amplifier and a high frequency transformer, the class D amplifier being connected to the low frequency transformer and the class AB amplifier being connected to the high frequency transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120135447.5U CN214845813U (en) | 2021-01-19 | 2021-01-19 | Pipeline instrument transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120135447.5U CN214845813U (en) | 2021-01-19 | 2021-01-19 | Pipeline instrument transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214845813U true CN214845813U (en) | 2021-11-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120135447.5U Active CN214845813U (en) | 2021-01-19 | 2021-01-19 | Pipeline instrument transmitter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214845813U (en) |
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2021
- 2021-01-19 CN CN202120135447.5U patent/CN214845813U/en active Active
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