High-frequency and high-power driving circuit of large-diameter ultrasonic flowmeter

Through the boost control module and impedance matching network module, combined with ultra-high-speed MOSFET gate driver and DC/DC boost, the voltage limitation and complexity problems in large-caliber ultrasonic flow meters are solved, and high-precision, low-power flow measurement is achieved.

CN223348542UActive Publication Date: 2025-09-16SHIJIAZHUANG CEEBIC INSTR
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Patent Information

Application Number
CN202422041016.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-08-22
Publication Date
2025-09-16
Estimated Expiration
2034-08-22

AI Technical Summary

Technical Problem

Existing industrial ultrasonic flow measurement circuits have problems such as large voltage limitations, high cost, high power consumption, and measurement accuracy affected by ambient temperature differences when measuring large diameters.

Method used

It adopts a boost control module, MOSFET gate drive module, diode drive output module and transducer impedance matching network module. Through boosting and impedance matching, it achieves high-frequency and high-power drive. It uses ultra-high-speed MOSFET gate driver and DC/DC boost to support 5V-35V voltage drive, and has a simple circuit design.

Benefits of technology

It achieves high-precision flow measurement in low-power battery application scenarios, solves the problems of circuit complexity and voltage limitation, and improves measurement accuracy and scope of application.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a high-frequency high-power drive circuit for a large-diameter ultrasonic flowmeter, which relates to the field of ultrasonic measurement and comprises a boost control module, a power supply module, a power supply module, a power supply module, a power supply module, a power supply module and a power supply module, and is characterized in that the boost control module is used for boosting an input voltage to a driving voltage required for driving a transducer; the driving voltage is used as a working voltage source of the MOSFET gate driving module; compared with the prior art, the utility model has the beneficial effects that the ultra-high-speed MOSFET gate driver is taken as a core, DC / DC boosting is integrated, the requirements of 5V-35V voltage driving, rising and falling edge typical deviation of 5ns and circuit input voltage as low as 1.8 V can be met, and the requirements of most low-power-consumption battery application scenes can be met; the circuit has low requirements for technical indexes of electronic components, the circuit design is simple, and the defects that an amplifier scheme is high in cost and a gate circuit scheme is small in application range are well overcome.
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Description

Technical Field

[0001] The utility model relates to the field of ultrasonic measurement, in particular to a high-frequency and high-power driving circuit for a large-caliber ultrasonic flowmeter. Background Art

[0002] In large-caliber ultrasonic flow measurement, 70kHz-400kHz signals are often used for distance measurement or gas flow measurement. Ultrasonic frequency signals used for measuring liquids such as water and oil are above 1MHz. Increasing the frequency helps improve the accuracy of flow measurement. As the diameter of the measuring pipe increases, the signal attenuation increases. Therefore, ultrasonic transducers are often driven by square waves with a floating differential signal amplitude greater than 30V and a frequency greater than 1MHz. Currently, two solutions are commonly used for industrial ultrasonic measurement:

[0003] 1. High-speed amplifier solution. This solution has complex circuitry, high cost, and high power consumption, making it unsuitable for battery-powered operation. This solution places high demands on operational amplifier components. To ensure distortion-free square wave signals at high frequencies, it typically requires a wide operating bandwidth and a slew rate of at least 8000V / μs. This type of operational amplifier has limited options and limited interchangeability.

[0004] 2. Gate circuit construction solution. Using traditional 74-series and 4000-series digital integrated circuits to build the circuit, the gate circuit solution has the advantage of being simple. Square wave signals are driven by the construction of NAND gate circuits. However, due to the delay in gate circuit transmission, the cumulative delay deviation of the constructed multi-stage gate circuit can reach tens of nanoseconds. This can cause distortion of the high-frequency transmission signal over a wide range of ambient temperature differences, thus affecting measurement accuracy. Secondly, due to the limitations of digital integrated circuit technology, the operating voltage that the gate circuit solution can drive is generally less than 15V, which cannot meet the demand for higher drive voltages.

[0005] In summary, the existing industrial ultrasonic measurement circuit has a large power supply voltage limitation and needs to be improved. Utility Model Content

[0006] The purpose of the utility model is to provide a high-frequency and high-power driving circuit for a large-caliber ultrasonic flowmeter to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above objectives, the present invention provides the following technical solutions:

[0008] A high-frequency and high-power driving circuit for a large-caliber ultrasonic flowmeter, comprising:

[0009] A boost control module is used to boost the input voltage to the driving voltage required for driving the transducer, and the driving voltage serves as the operating voltage source of the MOSFET gate drive module;

[0010] MOSFET gate drive module, used to convert ultrasonic signals into two mutually anti-phase signals and output them to the diode drive output module;

[0011] The diode drive output module is used to provide signal filtering function and output two mutually anti-phase signals to the transducer impedance matching network module;

[0012] The transducer impedance matching network module is used to match the impedances of the signal source, transmission line, and load by adjusting the impedance value of the circuit;

[0013] The boost control module is connected to the MOSFET gate drive module, the MOSFET gate drive module is connected to the diode drive output module, and the diode drive output module is connected to the transducer impedance matching network module.

[0014] As a further solution of the present invention: the boost control module includes chip U27, pin 6 of chip U27 introduces voltage VP-1, pin 7 of chip U27 is connected to one end of resistor R59, one end of resistor R60, and one end of inductor L1, the other end of resistor R60 is connected to one end of capacitor C3 and introduces voltage VP-1, the other end of resistor R59 is connected to pin 8 of chip U27, the other end of inductor L1 is connected to pin 1 of chip U27 and the positive pole of diode D1, the negative pole of diode D1 is connected to one end of capacitor C4, one end of resistor R95 and output voltage VDD, the other end of capacitor C4 is grounded, the other end of resistor R95 is connected to one end of resistor R96 and pin 5 of chip U27, the other end of resistor R96 is grounded, and the model of chip U27 is MC34063.

[0015] As a further solution of the present invention: the MOSFET gate drive module includes a chip U31, pin 6 of the chip U31 is connected to one end of the capacitor C56 and introduces the voltage VDD, pin 3 of the chip U31 is grounded, the other end of the capacitor C56 is grounded, pins 2 and 4 of the chip U31 are connected to one end of the resistor R64, and the other end of the resistor R64 introduces the ultrasonic signal CH-OUT, pins 5 and 7 of the chip U31 are connected to the diode drive output module, and the model of the chip U31 is IX4428.

[0016] As a further solution of the present invention: the diode drive output module includes a diode D11, a diode D12, a diode D13, and a diode D14. The cathode of the diode D11 is connected to the anode of the diode D12 and pin 5 of the chip U31, the cathode of the diode D13 is connected to the anode of the diode D14 and pin 7 of the chip U31, the anode of the diode D11 is connected to the cathode of the diode D12 and the transducer impedance matching network module, and the anode of the diode D13 is connected to the cathode of the diode D14 and the transducer impedance matching network module.

[0017] As a further solution of the present invention: the transducer impedance matching network module includes a resistor R66, a resistor R65, a resistor R155, a resistor R153, and a resistor R154, one end of the resistor R66 is connected to one end of the resistor R155, one end of the resistor R153, and the diode drive output module, the other end of the resistor R66 is grounded, the other end of the resistor R153 is connected to the ultrasonic differential transducer, one end of the resistor R65 is connected to one end of the resistor R154, the other end of the resistor R155, and the diode drive output module, the other end of the resistor R65 is grounded, and the other end of the resistor R154 is connected to the ultrasonic differential transducer.

[0018] Compared with the existing technology, the beneficial effects of the present invention are: the present invention takes the ultra-high-speed MOSFET gate driver as the core, integrates DC / DC boost, can meet 5V-35V voltage drive (differential voltage drive reaches 70V), the typical deviation of the rising and falling edges is 5ns, and the circuit input voltage can be as low as 1.8V, which can meet the needs of most low-power battery application scenarios; the circuit has very low requirements on the technical indicators of electronic components, and the circuit design is simple, which effectively solves the shortcomings of high cost of amplifier solutions and small applicability of gate circuit solutions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of a high-frequency and high-power drive circuit for a large-caliber ultrasonic flowmeter.

[0020] Figure 2 The following is a circuit diagram of a high-frequency and high-power drive circuit for a large-caliber ultrasonic flowmeter. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] See also Figure 1, a high-frequency and high-power driving circuit for a large-caliber ultrasonic flowmeter, comprising:

[0023] A boost control module is used to boost the input voltage to the driving voltage required for driving the transducer, and the driving voltage serves as the operating voltage source of the MOSFET gate drive module;

[0024] MOSFET gate drive module, used to convert ultrasonic signals into two mutually anti-phase signals and output them to the diode drive output module;

[0025] The diode drive output module is used to provide signal filtering function and output two mutually anti-phase signals to the transducer impedance matching network module;

[0026] The transducer impedance matching network module is used to match the impedances of the signal source, transmission line, and load by adjusting the impedance value of the circuit;

[0027] The boost control module is connected to the MOSFET gate drive module, the MOSFET gate drive module is connected to the diode drive output module, and the diode drive output module is connected to the transducer impedance matching network module.

[0028] In this example: See Figure 1 The boost control module includes chip U27, pin 6 of chip U27 introduces voltage VP-1, pin 7 of chip U27 is connected to one end of resistor R59, one end of resistor R60, and one end of inductor L1, the other end of resistor R60 is connected to one end of capacitor C3 and introduces voltage VP-1, the other end of resistor R59 is connected to pin 8 of chip U27, the other end of inductor L1 is connected to pin 1 of chip U27 and the positive electrode of diode D1, the negative electrode of diode D1 is connected to one end of capacitor C4, one end of resistor R95, and output voltage VDD, the other end of capacitor C4 is grounded, the other end of resistor R95 is connected to one end of resistor R96 and pin 5 of chip U27, the other end of resistor R96 is grounded, and the model of chip U27 is MC34063.

[0029] The boost driver IC needs to use a power chip U27 with a maximum switching frequency of 100kHz to avoid the impact of ripple on the ultrasonic reception of high-frequency weak signals. The sampling resistor is composed of R95 and R96, and the sampling voltage of the output voltage signal VDD is obtained to pin 5 of the chip U27, thereby generating the required different driving voltages.

[0030] In this example: See Figure 2The MOSFET gate drive module includes a chip U31. Pin 6 of the chip U31 is connected to one end of the capacitor C56 and introduces the voltage VDD. Pin 3 of the chip U31 is grounded, and the other end of the capacitor C56 is grounded. Pins 2 and 4 of the chip U31 are connected to one end of the resistor R64, and the other end of the resistor R64 introduces the ultrasonic signal CH-OUT. Pins 5 and 7 of the chip U31 are connected to the diode drive output module. The model of the chip U31 is IX4428.

[0031] The ultra-high-speed MOSFET gate driver U31 consists of a unidirectional driver and an inverse driver. The voltage VDD serves as the operating voltage of the chip U31. The ultrasonic signal CH-OUT is simultaneously input to the two drivers through the matching resistor R64 at pins 2 and 4 of the chip U31. The signal is output through pins 5 and 7 of U31. The two signals are in opposite directions, and the differential signal voltage Vpp = 2*VDD.

[0032] In this example: See Figure 2 The diode drive output module includes a diode D11, a diode D12, a diode D13, and a diode D14. The cathode of the diode D11 is connected to the anode of the diode D12 and pin 5 of the chip U31. The cathode of the diode D13 is connected to the anode of the diode D14 and pin 7 of the chip U31. The anode of the diode D11 is connected to the cathode of the diode D12 and the transducer impedance matching network module. The anode of the diode D13 is connected to the cathode of the diode D14 and the transducer impedance matching network module.

[0033] The diode network composed of diodes D11, D12 and D13, D14 filters the signal through the unidirectional conduction characteristics of the diodes, ensuring that the output signal of the MOSFET gate driver is normal.

[0034] In this example: See Figure 2 The transducer impedance matching network module includes a resistor R66, a resistor R65, a resistor R155, a resistor R153, and a resistor R154. One end of the resistor R66 is connected to one end of the resistor R155, one end of the resistor R153, and the diode drive output module. The other end of the resistor R66 is grounded. The other end of the resistor R153 is connected to the ultrasonic differential transducer. One end of the resistor R65 is connected to one end of the resistor R154, the other end of the resistor R155, and the diode drive output module. The other end of the resistor R65 is grounded. The other end of the resistor R154 is connected to the ultrasonic differential transducer.

[0035] The two signals with opposite phases to each other directly drive the ultrasonic differential transducer after passing through the impedance matching network composed of R155, R153, R154, R66 and R65, thereby completing the differential drive (the high-speed amplifier solution and gate circuit construction solution also exist in ultrasonic flow measurement, which is the existing technology and will not be described in detail).

[0036] The working principle of the utility model is as follows: the boost control module is used to boost the input voltage to the driving voltage required for transducer driving, and the driving voltage serves as the working voltage source of the MOSFET gate driving module; the MOSFET gate driving module is used to convert the ultrasonic signal into two mutually anti-phase signals and output them to the diode driving output module; the diode driving output module is used to provide a signal filtering function and output the two mutually anti-phase signals to the transducer impedance matching network module; the transducer impedance matching network module is used to match the impedances between the signal source, the transmission line and the load by adjusting the impedance value of the circuit.

[0037] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered in all respects as exemplary and non-restrictive.

[0038] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A high-frequency and high-power driving circuit for a large-caliber ultrasonic flowmeter, characterized in that: The high-frequency and high-power drive circuit of the large-caliber ultrasonic flowmeter includes: A boost control module is used to boost the input voltage to the driving voltage required for driving the transducer, and the driving voltage serves as the operating voltage source of the MOSFET gate drive module; MOSFET gate drive module, used to convert ultrasonic signals into two mutually anti-phase signals and output them to the diode drive output module; The diode drive output module is used to provide signal filtering function and output two mutually anti-phase signals to the transducer impedance matching network module; The transducer impedance matching network module is used to match the impedances of the signal source, transmission line, and load by adjusting the impedance value of the circuit; The boost control module is connected to the MOSFET gate drive module, the MOSFET gate drive module is connected to the diode drive output module, and the diode drive output module is connected to the transducer impedance matching network module.

2. The high-frequency and high-power driving circuit for a large-caliber ultrasonic flowmeter according to claim 1, characterized in that: The boost control module includes chip U27, pin 6 of chip U27 introduces voltage VP-1, pin 7 of chip U27 is connected to one end of resistor R59, one end of resistor R60, and one end of inductor L1, the other end of resistor R60 is connected to one end of capacitor C3 and introduces voltage VP-1, the other end of resistor R59 is connected to pin 8 of chip U27, the other end of inductor L1 is connected to pin 1 of chip U27 and the positive electrode of diode D1, the negative electrode of diode D1 is connected to one end of capacitor C4, one end of resistor R95 and output voltage VDD, the other end of capacitor C4 is grounded, the other end of resistor R95 is connected to one end of resistor R96 and pin 5 of chip U27, the other end of resistor R96 is grounded, and the model of chip U27 is MC34063.

3. The high-frequency and high-power driving circuit for a large-caliber ultrasonic flowmeter according to claim 1 or 2, characterized in that: The MOSFET gate drive module includes chip U31. Pin 6 of chip U31 is connected to one end of capacitor C56 and introduces voltage VDD. Pin 3 of chip U31 is grounded, and the other end of capacitor C56 is grounded. Pins 2 and 4 of chip U31 are connected to one end of resistor R64, and the other end of resistor R64 introduces ultrasonic signal CH-OUT. Pins 5 and 7 of chip U31 are connected to the diode drive output module. The model of chip U31 is IX4428.

4. The high-frequency and high-power driving circuit for a large-caliber ultrasonic flowmeter according to claim 3, characterized in that: The diode drive output module includes diode D11, diode D12, diode D13, and diode D14. The cathode of diode D11 is connected to the anode of diode D12 and pin 5 of chip U31. The cathode of diode D13 is connected to the anode of diode D14 and pin 7 of chip U31. The anode of diode D11 is connected to the cathode of diode D12 and the transducer impedance matching network module. The anode of diode D13 is connected to the cathode of diode D14 and the transducer impedance matching network module.

5. The high-frequency and high-power driving circuit for a large-caliber ultrasonic flowmeter according to claim 1, characterized in that: The transducer impedance matching network module includes resistor R66, resistor R65, resistor R155, resistor R153, and resistor R154. One end of resistor R66 is connected to one end of resistor R155, one end of resistor R153, and the diode drive output module. The other end of resistor R66 is grounded. The other end of resistor R153 is connected to the ultrasonic differential transducer. One end of resistor R65 is connected to one end of resistor R154, the other end of resistor R155, and the diode drive output module. The other end of resistor R65 is grounded. The other end of resistor R154 is connected to the ultrasonic differential transducer.