CN217522808U - Automatic gain processing device for metering signals of ultrasonic gas meter - Google Patents
Automatic gain processing device for metering signals of ultrasonic gas meter Download PDFInfo
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Abstract
The utility model discloses an automatic gain processing device for ultrasonic gas meter measuring signals, wherein a power supply interface is connected with a power management module, and the power management module is respectively connected with an input signal matching module, a signal automatic gain processing module and an output signal matching module; the signal input interface is connected with the input signal matching module, the input signal matching module is connected with the signal automatic gain processing module, the signal automatic gain processing module is connected with the output signal matching module, and the output signal matching module is respectively connected with the differential signal output interface and the single-ended signal output interface and used for realizing filtering, buffering, amplitude automatic gain processing and differential signal conversion output of input ultrasonic echo signals. The utility model discloses can make ultrasonic wave echo signal's amplitude maintain within a relatively stable and reasonable scope when different gas composition, different runner structure, different temperatures, ultrasonic wave signal propagation time's when for follow-up following current, against the current accurate measurement provides the powerful assurance.
Description
Technical Field
The utility model relates to an ultrasonic wave gas table technical field, concretely relates to ultrasonic wave gas table measurement signal automatic gain processing apparatus.
Background
The ultrasonic gas meter has become a mainstream gas metering meter in the market after a common diaphragm gas meter, an IC card gas meter, a wired gas meter and a wireless remote gas meter by virtue of the advantages of small volume, wide measuring range, high precision, long service life and the like.
At present, the time difference method is the most widely applied measurement method in the technical scheme of ultrasonic gas meter measurement, and specifically, the flow rate of gas is calculated by using the difference of the propagation time of ultrasonic signals in forward flow and reverse flow, and then the flow rate of gas can be calculated by combining with the size data of a flow channel. Therefore, the accurate measurement of the propagation time of the ultrasonic signal in the forward flow and the backward flow becomes a key factor for restricting the measurement accuracy of the ultrasonic gas meter.
The amplitude of the ultrasonic signal is seriously attenuated in the transmission process, so that the amplitude of the ultrasonic echo signal received by a receiving end is only about a few millivolts, and the detection of the ultrasonic echo signal is very unfavorable. In addition, the amplitude of the ultrasonic echo signal is greatly influenced by factors such as different gas components, unreasonable structural design of the flow channel, temperature change and the like, and the measurement precision of the propagation time of the ultrasonic signal during forward flow and backward flow is seriously influenced.
When the amplitude of the ultrasonic echo signal is processed, the existing ultrasonic gas meter mainly adopts the following three modes:
1. as shown in fig. 1, the fixed gain amplification method is to use an operational amplifier to build a fixed gain amplification circuit to perform fixed gain amplification on the amplitude of an ultrasonic echo signal; when parameters such as gas components, flow channel structure design, temperature and the like are fixed and unchanged, the amplitude of the ultrasonic echo signal tends to be stable, and the ultrasonic echo signal can work normally under the condition. However, the fixed gain amplification circuit is used to amplify the amplitude of the ultrasonic echo signal by a fixed factor, which may result in a failure in measurement due to the failure of self-adaptation of the amplification factor.
2. As shown in fig. 2, in the multi-step adjustable gain amplification method, a feedback circuit first measures the amplitude of an output signal, and then controls the amplification factor of an operational amplifier in an amplification circuit by controlling an access resistor of an analog switch or a digital potentiometer according to the measurement result to form a multi-step adjustable gain amplification circuit, so as to realize multi-step adjustable gain amplification of the amplitude of an ultrasonic echo signal; because the gear adjusting range of the amplification factor is limited, the matching test is required to be carried out firstly when the device is used, the device can be normally used after the matching is passed, and the device can normally work when parameters such as gas components, flow channel structure design and temperature are slightly changed. However, the multi-gear adjustable gain amplifying circuit is adopted, the gear adjusting range of the amplification factor is limited, the precision is low, the matching test is required during the use, the multi-gear adjustable gain amplifying circuit can be normally used after the matching is passed, the anti-interference capability is poor, and the universality is not realized.
3. As shown in fig. 3, in the feedback automatic gain amplification method, the feedback circuit first measures the amplitude of the output signal, and then feeds back the measurement result to the reference voltage pin of the program-controlled operational amplifier in the amplification circuit to control the amplification factor of the program-controlled operational amplifier in the amplification circuit, so as to form the feedback automatic gain amplification circuit, thereby implementing automatic gain amplification on the amplitude of the ultrasonic echo signal. Because the peripheral feedback circuit is matched to normally work, the gas flow meter can normally work when parameters such as gas components, flow channel structure design, temperature and the like change within a certain range on the premise of ensuring the stable performance of the peripheral feedback circuit. The feedback type automatic gain control circuit can achieve amplification factor self-adaption theoretically, but can normally work only by being matched with a peripheral feedback circuit, signal delay is caused, instantaneity is low, circuit building is too complex, multi-stage cascade is often needed, power consumption is high, and therefore universality is not achieved.
Therefore, how to keep the amplitude of the received ultrasonic signal stable becomes a problem that needs to be solved at present.
SUMMERY OF THE UTILITY MODEL
To the weak point that exists among the prior art, the utility model provides an ultrasonic wave gas table measurement signal automatic gain processing apparatus.
The utility model discloses an ultrasonic wave gas table measurement signal automatic gain processing apparatus, include: the device comprises a power supply interface, a signal input interface, a differential signal output interface, a single-ended signal output interface, a power management module, an input signal matching module, a signal automatic gain processing module and an output signal matching module;
the power supply interface is connected with the power management module, and the power management module is respectively connected with the input signal matching module, the signal automatic gain processing module and the output signal matching module;
the signal input interface is connected with the input signal matching module, the input signal matching module is connected with the signal automatic gain processing module, the signal automatic gain processing module is connected with the output signal matching module, and the output signal matching module is respectively connected with the differential signal output interface and the single-ended signal output interface.
As a further improvement of the utility model,
the input signal matching module is used for filtering and buffering the ultrasonic echo signal input by the signal input interface to obtain a first signal;
the signal automatic gain processing module is used for carrying out amplitude automatic gain processing on the first signal to obtain a differential signal;
the output signal matching module is configured to filter the differential signal and input the filtered differential signal to the differential signal output interface; and meanwhile, converting the filtered differential signal into a single-ended signal, and inputting the single-ended signal into the single-ended signal output interface.
As a further improvement of the utility model, the supply voltage of the power supply interface is DC 3V.
As a further improvement, the power management module comprises a voltage reduction module and a negative pressure conversion module which are connected, the voltage reduction module is a low-voltage-difference linear voltage stabilizer with reverse current protection and enabling functions, and the negative pressure conversion module is a switch capacitor voltage converter.
As a further improvement of the utility model, the signal input interface is used for inputting the ultrasonic echo signal to be processed with the frequency of 200 kHz.
As a further improvement of the present invention, the input signal matching module includes an active high pass filter composed of a capacitor, a resistor, and an operational amplifier.
As a further improvement, the signal automatic gain processing module comprises an automatic gain amplifier, and the integrated circuit chip is simultaneously used for building without additionally building an external feedback circuit.
As a further improvement, the output signal matching module includes that the high pass filter that links to each other changes single-ended operational amplifier with the difference, differential signal output interface connection is in high pass filter changes between the single-ended operational amplifier with the difference, single-ended signal output interface connection is in the difference changes single-ended operational amplifier's output.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the device of the utility model has the function of amplitude automatic gain processing, and can maintain the amplitude of the ultrasonic echo signal within a relatively stable and reasonable range when different gas components, different flow channel structures and different temperatures, thereby providing powerful guarantee for the accurate measurement of the propagation time of the ultrasonic signal during the subsequent downstream and countercurrent processes and improving the measurement precision of the propagation time of the ultrasonic signal;
2. the circuit structure of the device is simple, multistage cascade is not needed, especially, the automatic gain processing module is built by adopting an integrated circuit chip scheme, an external feedback circuit is not needed to be additionally built, the reliability is high, the power consumption is low, and the device is very suitable for being applied to battery power supply scenes; meanwhile, the power consumption controller is provided with an enable control pin, an interface is reserved for further power consumption control in the follow-up process, and the power consumption controller is very strong in expansibility;
3. the utility model discloses the device possesses difference, single-ended dual mode signal output interface, and expansibility is strong, can realize that the multi-scene is used.
Drawings
FIG. 1 is a schematic diagram of a conventional fixed gain amplification method;
FIG. 2 is a schematic diagram of a conventional multi-stage variable gain amplifier;
FIG. 3 is a schematic diagram of a feedback AGC algorithm;
fig. 4 is a schematic structural diagram of an embodiment of the automatic gain processing device for measuring signals of an ultrasonic gas meter according to the present invention;
fig. 5 is a frame diagram of an embodiment of the automatic gain processing device for ultrasonic gas meter measurement signals of the present invention;
fig. 6 is a circuit diagram of the utility model relates to an embodiment discloses an ultrasonic wave gas table measurement signal automatic gain processing apparatus.
In the figure:
1. a power supply interface; 2. a signal input interface; 3. a differential signal output interface; 4. a single-ended signal output interface; 5. a power management module; 6. an input signal matching module; 7. a signal automatic gain processing module; 8. an output signal matching module; 9. a housing.
Detailed Description
To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and obviously, the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The invention is described in further detail below with reference to the accompanying drawings:
as shown in fig. 4 and 5, the utility model provides an ultrasonic wave gas table measurement signal automatic gain processing apparatus, include: the device comprises a power supply interface 1, a signal input interface 2, a differential signal output interface 3, a single-ended signal output interface 4, a power management module 5, an input signal matching module 6, a signal automatic gain processing module 7 and an output signal matching module 8; the power supply interface 1, the signal input interface 2, the differential signal output interface 3 and the single-ended signal output interface 4 are arranged on the shell 9, and the power management module 5, the input signal matching module 6, the signal automatic gain processing module 7 and the output signal matching module 8 are arranged in the shell 9.
The utility model discloses the connection relation of each module or interface is:
the power supply interface 1 of the utility model is connected with the power management module 5, and the power management module 5 is respectively connected with the input signal matching module 6, the signal automatic gain processing module 7 and the output signal matching module 8; the signal input interface 2 is connected with the input signal matching module 6, the input signal matching module 6 is connected with the signal automatic gain processing module 7, the signal automatic gain processing module 7 is connected with the output signal matching module 8, and the output signal matching module 8 is respectively connected with the differential signal output interface 3 and the single-ended signal output interface 4.
The utility model discloses the effect of each module or interface does:
the signal input interface 1 is used for inputting ultrasonic echo signals to be processed;
the power management module 5 is used for generating working voltages of the input signal matching module 6, the signal automatic gain processing module 7 and the output signal matching module 8;
the input signal matching module 6 is used for filtering and buffering the ultrasonic echo signal input by the signal input interface 1;
and the signal automatic gain processing module 7 is used for carrying out amplitude automatic gain processing on the signal input by the input signal matching module 6 so as to ensure the amplitude to be stable and outputting a differential signal with the stable amplitude.
The output signal matching module 8 is configured to perform filtering processing on the signal input by the signal automatic gain processing module 7, and input the filtered differential signal to the differential signal output interface 3 for output; meanwhile, the filtered differential signal is converted into a single-ended signal, and the single-ended signal is input to the single-ended signal output interface 4 for output.
As shown in fig. 6, the circuit structure of each module or interface of the present invention is:
and the power supply interface 1 is used for supplying power to the system for the automatic gain processing device of the metering signals of the ultrasonic gas meter, and the power supply voltage is direct current 3V.
The power management module 5 comprises a voltage reduction module formed by U1 and a negative voltage conversion module formed by U2; the U1 is an ultra-low IQ (quiescent current) low dropout regulator (LDO) with reverse current protection and enabling functions, which is used for converting a direct current (3V) voltage into a direct current (2.5V) voltage; the input and output capacitors C1, C2 and C3 are used for improving transient response, reducing ripples and improving PSRR (power supply rejection ratio), and a stable X7R ceramic capacitor is recommended. U2 is a switch capacitor voltage converter for converting DC positive 2.5V voltage to DC negative 2.5V voltage, capacitors C4, C7 are charge pump capacitors with a capacitance of 10 μ F, and capacitors C5, C6 are used to improve transient response, reduce ripple and improve PSRR (power supply rejection ratio).
And the signal input interface 2 is used for inputting ultrasonic echo signals to be processed with the frequency of 200 kHz.
And the input signal matching module 6 is used for filtering and buffering the ultrasonic echo signal with the frequency of 200kHz input by the signal input interface. Because the amplitude of the ultrasonic echo signal is low, the amplitude is only about a few millivolts, and the ultrasonic echo signal contains direct current and alternating current interference signal components; therefore, the utility model discloses a high pass filter is formed to electric capacity C24, resistance R15, and resistance R14 is used for providing a route of bleeding for the direct current signal in the ultrasonic echo signal; by means of the characteristics of infinite input resistance and infinite output resistance of an ideal operational amplifier, the operational amplifier U4, the capacitor C24 and the resistor R15 together form an active high-pass filter, filtering and buffering of ultrasonic echo signals are achieved, and impedance matching can be performed by adjusting the resistance value of the resistor R5.
And the signal automatic gain processing module 7 is used for carrying out amplitude automatic gain processing on the signal input by the input signal matching module so as to ensure that the amplitude is stable, so that the amplitude of the ultrasonic echo signal is maintained in a relatively stable and reasonable range. It should be noted that the present invention relates to a signal automatic gain processing module using an integrated circuit chip, which does not need to additionally add an external feedback circuit. U3 is a low-noise, low-power consumption, accurate gain variable gain amplifier compatible with single-ended and differential input, U3 is powered by +3V voltage, and a current output root-mean-square detector is integrated inside, and can be used for configuring U3 as an AGC amplifier to realize an automatic gain control function. The pins INPR and INMR and the pins INPD and INMD are two sets of signal input ports respectively, except that 1K fixed resistance resistors are integrated in the INPR and INMR signal input ports, and the INPD and INMD signal input ports can be used for adjusting the gain range by configuring external resistance values by users according to different application scenes. The selective welding of the resistors R7 and R11 and R8 and R12 can flexibly adjust the input mode of the ultrasonic echo signal. The resistor R13 is a reserved debugging resistor and is used for controlling the on-off of the front-stage circuit and the rear-stage circuit. The capacitors C21 and C26 and the resistors R9 and R10 form a high-pass filter which is used for blocking direct current or low-frequency components in the ultrasonic echo signal. The pin VREF is an internal 1.5V reference voltage source, the AGC circuit adjusts the voltage of the driving GAIN control input pin GAIN according to the voltage difference between the AGC voltage pin VAGC and the pin VREF, the capacitor C25 is used for adjusting the response time of the AGC circuit, and the final output target root mean square voltage is the absolute value of the voltage difference between the pin VAGC and the pin VREF, that is, the pin MODE is a GAIN slope control pin. The pin OFSN is an offset pin calibration pin, and the capacitor C17 and the internal resistance of U3 form a high-pass filter for offset calibration. Pins OUTP and OPTM are positive and negative output pins of the differential signal, FBKP and FBKM are positive and negative feedback nodes of the differential signal, and capacitors C18 and C20 and a feedback resistor in U3 form a low-pass filter together to reduce high-frequency noise in the output signal and improve the quality of the output signal.
And the output signal matching module 8 is configured to perform filtering processing on the signal input by the signal automatic gain processing module, convert the differential signal into a single-ended signal, and output the processed differential signal and the processed single-ended signal through the differential signal output interface 3 and the single-ended signal output interface 4, respectively. The capacitor C11, the resistor R3, the capacitor C13 and the resistor R6 form two groups of high-pass filters for further reducing high-frequency noise in the output signal, and the U5 is a differential-to-single-ended operational amplifier for converting the differential signal output by the signal automatic gain processing module into a single-ended signal.
The utility model has the advantages that:
1. the device of the utility model has the function of amplitude automatic gain processing, and can maintain the amplitude of the ultrasonic echo signal within a relatively stable and reasonable range when different gas components, different flow channel structures and different temperatures, thereby providing powerful guarantee for the accurate measurement of the ultrasonic signal propagation time during the subsequent downstream and countercurrent processes and improving the measurement precision of the ultrasonic signal propagation time;
2. the circuit structure of the device is simple, multistage cascade is not needed, especially, the automatic gain processing module is built by adopting an integrated circuit chip scheme, an external feedback circuit is not needed to be additionally built, the reliability is high, the power consumption is low, and the device is very suitable for being applied to battery power supply scenes; meanwhile, the power consumption controller is provided with an enable control pin, an interface is reserved for further power consumption control in the follow-up process, and the power consumption controller is very strong in expansibility;
3. the device of the utility model has two signal output interfaces of differential mode and single-ended mode, has strong expansibility and can realize multi-scene application; for example, a differential analog-digital converter can be connected for high-precision waveform detection, and a single-end output can be connected with an ultrasonic time measurement chip for ultrasonic flight time measurement.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides an ultrasonic wave gas table measurement signal automatic gain processing apparatus which characterized in that includes: the device comprises a power supply interface, a signal input interface, a differential signal output interface, a single-ended signal output interface, a power management module, an input signal matching module, a signal automatic gain processing module and an output signal matching module;
the power supply interface is connected with the power management module, and the power management module is respectively connected with the input signal matching module, the signal automatic gain processing module and the output signal matching module;
the signal input interface is connected with the input signal matching module, the input signal matching module is connected with the signal automatic gain processing module, the signal automatic gain processing module is connected with the output signal matching module, and the output signal matching module is respectively connected with the differential signal output interface and the single-ended signal output interface.
2. The automatic gain processing device for the ultrasonic gas meter measuring signal according to claim 1,
the input signal matching module is used for filtering and buffering the ultrasonic echo signal input by the signal input interface to obtain a first signal;
the signal automatic gain processing module is used for carrying out amplitude automatic gain processing on the first signal to obtain a differential signal;
the output signal matching module is configured to filter the differential signal and input the filtered differential signal to the differential signal output interface; and meanwhile, converting the filtered differential signal into a single-ended signal, and inputting the single-ended signal to the single-ended signal output interface.
3. The automatic gain processing device for the metering signal of the ultrasonic gas meter according to claim 1 or 2, wherein the power supply voltage of the power supply interface is direct current 3V.
4. The automatic gain processing device for the metering signal of the ultrasonic gas meter according to claim 1 or 2, wherein the power management module is composed of a voltage reduction module and a negative voltage conversion module which are connected, the voltage reduction module is a low-dropout linear voltage regulator having reverse current protection and enabling functions, and the negative voltage conversion module is a switched capacitor voltage converter.
5. The automatic gain processing device for the metering signal of the ultrasonic gas meter as claimed in claim 1 or 2, wherein the signal input interface is used for inputting an ultrasonic echo signal to be processed with a frequency of 200 kHz.
6. The automatic gain processing device for the metering signal of the ultrasonic gas meter as claimed in claim 1 or 2, wherein the input signal matching module comprises an active high-pass filter consisting of a capacitor, a resistor and an operational amplifier.
7. The automatic gain processing device for the metering signals of the ultrasonic gas meter as claimed in claim 1 or 2, wherein the automatic gain processing module comprises an automatic gain amplifier, and is built by adopting an integrated circuit chip without additionally building an external feedback circuit.
8. The automatic gain processing device for the metering signals of the ultrasonic gas meter as claimed in claim 1 or 2, wherein the output signal matching module comprises a high-pass filter and a differential-to-single-ended operational amplifier which are connected, the differential signal output interface is connected between the high-pass filter and the differential-to-single-ended operational amplifier, and the single-ended signal output interface is connected to the output end of the differential-to-single-ended operational amplifier.
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| CN202221007120.0U CN217522808U (en) | 2022-04-27 | 2022-04-27 | Automatic gain processing device for metering signals of ultrasonic gas meter |
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| CN202221007120.0U CN217522808U (en) | 2022-04-27 | 2022-04-27 | Automatic gain processing device for metering signals of ultrasonic gas meter |
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Effective date of registration: 20231114 Address after: Room 601, Building 3, No. 50 Haitai Innovation Street, Huayuan Industrial Zone (Huanwai), Binhai High tech Zone, Binhai New Area, Tianjin, 300392 Patentee after: Tianjin Xinzhi Perception Technology Co.,Ltd. Address before: 065001 hill 0387, 118 Huaxiang Road, Langfang Economic and Technological Development Zone, Hebei Province Patentee before: Langfang Xinao Intelligent Technology Co.,Ltd. |