System and method for reducing leakage inductance of non-contact ultrasonic transducer

Abstract

The invention discloses a method for reducing leakage inductance of a non-contact ultrasonic transducer, and belongs to the technical field of ultrasonic transducers, and the method comprises the following steps: circuit initial configuration; leakage inductance is detected in real time; feedback control and capacitance adjustment; relay operation and capacitor switching; the system comprises an ultrasonic transducer, a GPIO (General Purpose Input / Output) control module, a relay control module, a leakage inductance detection module and a feedback control module, the capacitance value is dynamically adjusted through a GPIO control relay, so that the system can automatically adjust circuit parameters according to the current leakage inductance condition, real-time matching of resonant frequencies is realized, and the reliability of the system is improved. The problem that manual adjustment in a traditional circuit is inconvenient is solved. According to the non-contact ultrasonic transducer, the leakage inductance problem in the non-contact ultrasonic transducer can be effectively reduced, and the energy transmission efficiency is improved to the maximum extent. By automatically adjusting capacitance matching, the system can keep the working frequency near the resonant frequency all the time, so that the energy loss is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of ultrasonic transducers, and in particular relates to a system and method for reducing leakage inductance of a non-contact ultrasonic transducer. Background Art

[0002] During operation, ultrasonic transducers generate ultrasonic waves by converting electrical energy into mechanical vibrations. Traditional ultrasonic transducers are usually in direct contact with the working medium (such as liquid or solid) to achieve efficient energy transmission. However, in some applications, the transducer cannot be in direct contact with the medium and ultrasonic waves must be transmitted in a non-contact manner. This type of non-contact ultrasonic transducer is widely used in ultrasonic ranging, non-destructive testing, liquid level measurement and some special industrial cleaning.

[0003] In the non-contact working mode, due to the poor coupling between the medium and the transducer, there is a large leakage inductance, which causes the energy to be unable to be effectively transferred to the target medium, resulting in the following problems: 1) Large leakage inductance: Since ultrasonic waves need to propagate through media such as air, their energy is easily scattered or attenuated, resulting in large leakage inductance in the circuit.

[0004] 2) Impedance matching is difficult: The impedance between the transducer and the load cannot always remain consistent, especially when the working conditions (such as temperature, medium changes, etc.) change, the traditional fixed circuit is difficult to adjust to match the optimal working state.

[0005] 3) Low energy efficiency: Due to the large leakage inductance, the overall energy utilization efficiency of the system is low, and a higher input power is required to meet the working requirements.

[0006] Most existing technical solutions rely on fixed capacitors, inductors and resistors to match the resonant frequency. However, this fixed matching method is less flexible in actual work, especially in applications where the environment and load conditions vary greatly, it is difficult to maintain a long-term stable matching effect. Specifically, there are the following defects: Fixed matching lacks flexibility: The matching circuits of existing ultrasonic transducers often use fixed capacitance or inductance values, which are difficult to adjust in real time according to the dynamic changes of leakage inductance, resulting in the gradual failure of the matching effect during operation.

[0007] The operating frequency deviates from the optimal point: Since the leakage inductance fluctuates with environmental changes, the existing matching circuit cannot be adjusted dynamically, causing the operating frequency of the transducer to deviate from the resonant frequency, resulting in reduced efficiency.

[0008] Difficulty in manual adjustment: In some applications, it may be necessary to manually adjust the capacitor or inductor components in the circuit to achieve matching, which is not only time-consuming and labor-intensive, but also difficult to respond in a timely manner under complex working conditions. Summary of the invention

[0009] In order to solve the problem of large leakage inductance in existing non-contact ultrasonic transducers, the present invention proposes a method of using GPIO to control relays to dynamically select multiple capacitance values, thereby realizing automatic matching and adjustment of the transducer working circuit. By calculating the leakage inductance of the system in real time, the appropriate capacitance value is selected to reduce the leakage inductance and improve the energy transmission efficiency of the system. The core of the present invention is to dynamically adjust the capacitance value through the GPIO interface control circuit relay to match the resonant frequency of the transducer and reduce the leakage inductance. The technical solution includes the following key parts: GPIO control circuit: There is a capacitor matching circuit in the system, which is designed with multiple capacitor groups. Each capacitor group consists of one or more capacitors, and the capacitance values ​​are arranged from small to large. These capacitors are connected to the driving circuit of the ultrasonic transducer through relays. The GPIO interface is used to control the opening or closing of the relay. According to the needs, the system can choose to connect the appropriate capacitor group to the circuit, thereby changing the capacitance value to match the current working conditions.

[0010] Leakage inductance detection and calculation: By real-time monitoring of the transducer's electrical parameters (such as voltage, current, phase difference, etc.), the system uses an algorithm to calculate the leakage inductance in the current circuit. Based on the calculated leakage inductance value, the system determines the impedance matching between the current circuit and the transducer. If a poor match is found (excessive leakage inductance), the system will trigger the GPIO interface and adjust the capacitance value through the relay.

[0011] Automatic capacitance adjustment: When the system detects that the leakage inductance is large, the system controls the relay through the GPIO interface to select the appropriate capacitor group to connect to the circuit according to the calculation results, thereby adjusting the capacitance value of the circuit and reducing the leakage inductance. The capacitance adjustment process can be carried out through multiple iterations until the most suitable capacitance value is found, so that the operating frequency of the transducer is consistent with the resonant frequency and the best energy transmission state is achieved.

[0012] Dynamic feedback control: This system is equipped with a dynamic feedback control module, which detects the working status of the system in real time and continuously adjusts the capacitance value according to the change of leakage inductance to ensure that the transducer is always in the best matching state. The feedback system will regularly check the operating frequency of the transducer and automatically adjust the capacitance value to adapt to the changes in the external environment and load to ensure that the leakage inductance is minimized.

[0013] The main technical architecture of the present invention includes a GPIO control module: responsible for controlling the state switching of the relay, opening or closing the corresponding relay according to the feedback signal, and selecting different capacitor groups. Relay module: responsible for switching capacitor groups with different capacitance values ​​into the circuit to provide flexible capacitor matching. Leakage inductance calculation and detection module: collects the voltage and current signals in the circuit in real time through the sensor to calculate the current leakage inductance. Automatic control algorithm: adopts the feedback control algorithm to dynamically adjust the capacitance value according to the leakage inductance calculation result to ensure the best matching state of the system. Capacitor group: includes multiple capacitors, divided into several groups, and the capacitance values ​​of different groups are different to meet different matching requirements.

[0014] As an improvement of the present invention, a system for reducing the leakage inductance of a non-contact ultrasonic transducer based on the method, the system includes an ultrasonic transducer, a GPIO control module, a relay control module, a leakage inductance detection module and a feedback control module, the ultrasonic transducer converts electrical energy into ultrasonic energy to drive an ultrasonic signal, the GPIO control module is used to control the relay to switch different capacitor groups, the relay control module is used to connect or disconnect different capacitor groups, and select a suitable capacitor group according to the GPIO control signal, the leakage inductance detection module monitors the voltage, current and phase difference in real time through a sensor, and calculates the leakage inductance in the circuit, and the feedback control module determines whether the capacitance value needs to be adjusted through an algorithm based on the leakage inductance calculation result.

[0015] As an improvement of the present invention, the system further comprises a capacitor group, which is composed of a plurality of capacitors with different capacitance values, and each capacitor group is connected to the ultrasonic transducer circuit via a relay.

[0016] As an improvement of the present invention, the system further comprises a driving power module, which provides a driving signal for the ultrasonic transducer and transfers the ultrasonic energy emitted by the transducer to the working medium.

[0017] As an improvement of the present invention, the GPIO control module is implemented by a single chip microcomputer or a microcontroller.

[0018] The technical solution of the present invention is as follows: A method for reducing the leakage inductance of a non-contact ultrasonic transducer, the method comprising the following steps: Step S1, initial configuration of the circuit; Step S2, real-time detection of leakage inductance; Step S3, feedback control and capacitance adjustment; Step S4, relay actuation and capacitor switching; Step S5, repeating feedback and dynamic adjustment.

[0019] As an improvement of the present invention, the initial circuit configuration in step S1 includes step S11 and step S12. Step S11, when the system starts, the ultrasonic transducer works through the initial capacitance value, and the initial capacitance group is composed of the default intermediate value capacitance; Step S12: The GPIO control module loads an initial capacitor group. By default, the system selects a capacitor value in a middle range to access the circuit.

[0020] As an improvement of the present invention, the leakage inductance real-time detection in step S2 includes step S21 and step S22. Step S21, the system collects the working parameters of the transducer circuit in real time through the leakage inductance detection module, including voltage, current and phase difference; Step S22, by calculating the phase difference or the electrical impedance, the system can calculate the leakage inductance value in the current circuit, and the leakage inductance value is estimated by the following formula:

[0021] in, is the circuit voltage, is the current, It is the phase difference between voltage and current. Based on the leakage inductance value, the system evaluates whether the current capacitor bank is matched.

[0022] As an improvement of the present invention, the step S3 feedback control and capacitance adjustment includes step S31 and step S32. Step S31, after the leakage inductance calculation is completed, the feedback control module will analyze the calculation results. If the system detects that the leakage inductance is large, the capacitance adjustment process is triggered; Step S32: According to a preset algorithm, the system will calculate the adjustment direction and select a suitable capacitor group through the GPIO control relay.

[0023] As an improvement of the present invention, the step S4 relay action and capacitor switching includes the GPIO module selecting a corresponding relay according to the feedback control signal, each relay corresponds to a different capacitor group, and when the relay is actuated, the new capacitor group is connected to the circuit, specifically including steps S41 and S42, Step S41, the GPIO port outputs a high level signal to drive the relay coil, so that the relay contacts are closed, and the new capacitor group is incorporated into the circuit; Step S42: After the capacitor bank switching is completed, the system re-measures the leakage inductance and checks whether the matching is optimized.

[0024] As an improvement of the present invention, the step S5 of repeated feedback and dynamic adjustment includes step S51 and step S52. Step S51, the system will periodically re-collect the voltage and current signals and update the leakage inductance value. If further leakage inductance changes are detected, the feedback control system will continue to adjust the capacitance value according to the new data until the operating frequency of the transducer is optimally matched with the system resonant frequency and the leakage inductance is reduced to an acceptable range; Step S52: This process is a dynamic cycle. When the external environment changes, the system can automatically adjust the capacitance value of the circuit to maintain the best working state of the transducer.

[0025] Compared with the prior art, the beneficial effects of the present invention are: 1) Automatic matching and real-time adjustment: The capacitance value is dynamically adjusted by controlling the relay through GPIO, so that the system can automatically adjust the circuit parameters according to the current leakage inductance and achieve real-time matching of the resonant frequency, solving the problem of inconvenient manual adjustment in traditional circuits.

[0026] 2) Reduce leakage inductance and improve efficiency: The present invention can effectively reduce the leakage inductance problem in the non-contact ultrasonic transducer and maximize the energy transmission efficiency. By automatically adjusting the capacitor matching, the system can always keep the operating frequency near the resonant frequency, thereby reducing energy loss.

[0027] 3) Flexibility and adaptability: The solution can adapt to different application scenarios. Regardless of how the environment changes (such as temperature, dielectric properties, etc.), the system can automatically adjust the capacitance value according to the actual working status to maintain the best energy transmission performance.

[0028] 4) Simplified design and maintenance: Through automated control and adjustment, the system can significantly reduce manual intervention, lower maintenance costs, simplify system design, and enhance system reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a flow chart of a method for reducing leakage inductance of a non-contact ultrasonic transducer in this embodiment; Figure 2 4 is a system structure diagram for reducing the leakage inductance of the non-contact ultrasonic transducer in this embodiment. DETAILED DESCRIPTION

[0030] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0031] Example: Figure 1 to Figure 2 As shown in the figure, this implementation system consists of the following main modules: Ultrasonic transducer: As an energy conversion device, it converts electrical energy into ultrasonic energy and drives ultrasonic signals.

[0032] GPIO control module: implemented by a single-chip microcomputer (such as STM32) or a microcontroller, used to control the relay to switch different capacitor groups.

[0033] Relay control module: It consists of multiple relays and is used to connect or disconnect different capacitor groups and select the appropriate capacitor group according to the GPIO control signal.

[0034] Capacitor group: It is composed of multiple capacitors with different capacitance values. Each capacitor group is connected to the ultrasonic transducer circuit through a relay.

[0035] Leakage inductance detection module: monitors voltage, current and phase difference in real time through sensors, and calculates leakage inductance in the circuit.

[0036] Feedback control module: Based on the leakage inductance calculation results, the algorithm determines whether the capacitance value needs to be adjusted to optimize system matching.

[0037] Driving power module: provides driving signal for ultrasonic transducer and transfers ultrasonic energy emitted by the transducer to the working medium.

[0038] The process of this embodiment includes: initial circuit configuration: when the system starts, the ultrasonic transducer works through the initial capacitance value, and the initial capacitance group is composed of the default intermediate value capacitance. The GPIO control module loads the initial capacitance group. By default, the system selects a capacitance value in the middle range to connect to the circuit to ensure that the transducer can work normally.

[0039] Real-time leakage inductance detection: The system collects the operating parameters of the transducer circuit in real time through the leakage inductance detection module, including voltage, current and phase difference. By calculating the phase difference or electrical impedance, the system can calculate the leakage inductance value in the current circuit. The leakage inductance value is estimated by the following formula:

[0040] in, is the circuit voltage, is the current, is the phase difference between voltage and current. Based on the leakage inductance value, the system evaluates whether the current capacitor bank is matched.

[0041] Feedback control and capacitor adjustment: After the leakage inductance calculation is completed, the feedback control module will analyze the calculation results. If the system detects that the leakage inductance is large (that is, the impedance matching of the circuit is poor), the capacitor adjustment process is triggered. According to the preset algorithm, the system will calculate the adjustment direction and select the appropriate capacitor bank through the GPIO control relay. For example, if the system needs to increase the capacitance value, the GPIO control relay disconnects the current capacitor bank and connects a capacitor bank with a larger capacity. Conversely, if the capacitance value needs to be reduced, the GPIO will connect a capacitor bank with a smaller capacity.

[0042] Relay action and capacitor switching: The GPIO module selects the corresponding relay according to the feedback control signal. Each relay corresponds to a different capacitor group. When the relay is activated, the new capacitor group is connected to the circuit. The specific operation is as follows: The GPIO port outputs a high-level signal to drive the relay coil, so that the relay contacts are closed and the new capacitor group is connected to the circuit. After the capacitor group is switched, the system re-measures the leakage inductance and checks whether the matching is optimized.

[0043] Repeated feedback and dynamic adjustment: The system will periodically re-collect the voltage and current signals and update the leakage inductance value. If further leakage inductance changes are detected, the feedback control system will continue to adjust the capacitance value according to the new data until the operating frequency of the transducer is optimally matched to the system resonant frequency and the leakage inductance is reduced to an acceptable range. This process is a dynamic cycle, and the system can automatically adjust the capacitance value of the circuit to maintain the optimal working state of the transducer when the external environment (such as temperature, load changes, etc.) changes.

[0044] The design and control strategy of the specific capacitor bank in this embodiment are as follows: In order to adapt to different working conditions and load changes, the capacitor group in this embodiment is flexibly designed and generally includes the following groups of capacitors: C1: The minimum capacitance value group, which is used for light loads or high resonant frequencies. C2: The medium capacitance value group, which is used as the initial default capacitance group for normal working conditions. C3: The larger capacitance value group, which is used for heavy loads or large leakage inductance. C4: The maximum capacitance value group, which is used for situations where maximum impedance matching is required.

[0045] The control strategy includes: When the system is initially working, the default selection of C2 group is used as the initial capacitance value. If the leakage inductance increases, the system will select a larger capacitor group (such as C3 or C4) to increase the circuit capacitance and reduce the leakage inductance. If the system detects that the current and voltage phase difference becomes smaller, the feedback system will select a smaller capacitor group (such as C1) for fine-tuning. After each adjustment, the system will wait for a period of stabilization and perform the next detection and adjustment until the best matching state is achieved.

[0046] Implementation of the control algorithm of this embodiment: 1. Calculation and judgment of leakage inductance: The system calculates the current leakage inductance value through the phase difference, impedance and capacitance formula:

[0047] When the leakage inductance value exceeds the preset threshold, the system determines that the current capacitor matching circuit cannot achieve optimal matching and enters the feedback adjustment process.

[0048] 2. Algorithm adjustment logic: Initial stage: Set a target leakage inductance range, usually within a certain percentage of the minimum leakage inductance value.

[0049] Capacitor adjustment strategy: If the leakage inductance value exceeds the target range, the system calculates whether the capacitance value needs to be increased or decreased, and selects the next group of capacitors based on the current capacitor group to adjust the circuit.

[0050] The system advantages of this embodiment include dynamic adjustment and strong adaptability: the solution can automatically adjust the capacitance value according to the leakage inductance change in real time without manual intervention, and can adapt to various complex environments, especially application scenarios with large load changes. The leakage inductance reduction effect is significant: by dynamically adjusting the capacitance value, the system can reduce the leakage inductance in the non-contact ultrasonic transducer, improve energy transmission efficiency, and reduce energy loss. Simplified operation and maintenance: this solution reduces the tedious operation of traditional manual adjustment through automated control technology, and improves the stability and reliability of the system.

[0051] It should be noted that the above content only illustrates the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications all fall within the protection scope of the claims of the present invention.

Claims

1. A method for reducing leakage inductance of a non-contact ultrasonic transducer, characterized in that: The method comprises the following steps, Step S1, initial configuration of the circuit; Step S2, real-time detection of leakage inductance; Step S3, feedback control and capacitance adjustment; Step S4, relay actuation and capacitor switching; Step S5, repeating feedback and dynamic adjustment.

2. The method for reducing leakage inductance of a non-contact ultrasonic transducer according to claim 1, characterized in that: The circuit initialization configuration of step S1 includes step S11 and step S12. Step S11, when the system starts, the ultrasonic transducer works through the initial capacitance value, and the initial capacitance group is composed of the default intermediate value capacitance; Step S12: The GPIO control module loads an initial capacitor group. By default, the system selects a capacitor value in a middle range to access the circuit.

3. The method for reducing leakage inductance of a non-contact ultrasonic transducer according to claim 1, characterized in that: The step S2 leakage inductance real-time detection includes step S21 and step S22. Step S21, the system collects the working parameters of the transducer circuit in real time through the leakage inductance detection module, including voltage, current and phase difference; Step S22, by calculating the phase difference or the electrical impedance, the system can calculate the leakage inductance value in the current circuit, and the leakage inductance value is estimated by the following formula: ,in, is the circuit voltage, is the current, It is the phase difference between voltage and current. Based on the leakage inductance value, the system evaluates whether the current capacitor bank is matched.

4. The method for reducing leakage inductance of a non-contact ultrasonic transducer according to claim 1, characterized in that: The step S3 feedback control and capacitance adjustment includes step S31 and step S32. Step S31, after the leakage inductance calculation is completed, the feedback control module will analyze the calculation results. If the system detects that the leakage inductance is large, the capacitance adjustment process is triggered; Step S32: According to a preset algorithm, the system will calculate the adjustment direction and select a suitable capacitor group through the GPIO control relay.

5. The method for reducing leakage inductance of a non-contact ultrasonic transducer according to claim 1, characterized in that: The step S4 of relay action and capacitor switching includes the GPIO module selecting a corresponding relay according to the feedback control signal, each relay corresponds to a different capacitor group, and when the relay is actuated, a new capacitor group is connected to the circuit, specifically including step S41 and step S42. Step S41, the GPIO port outputs a high level signal to drive the relay coil, so that the relay contacts are closed, and the new capacitor group is incorporated into the circuit; Step S42: After the capacitor bank switching is completed, the system re-measures the leakage inductance and checks whether the matching is optimized.

6. The method for reducing leakage inductance of a non-contact ultrasonic transducer according to claim 1, characterized in that: The step S5 repeats feedback and dynamic adjustment and includes step S51 and step S52. Step S51, the system will periodically re-collect the voltage and current signals and update the leakage inductance value. If further leakage inductance changes are detected, the feedback control system will continue to adjust the capacitance value according to the new data until the operating frequency of the transducer is optimally matched with the system resonant frequency and the leakage inductance is reduced to an acceptable range; Step S52: This process is a dynamic cycle. When the external environment changes, the system can automatically adjust the capacitance value of the circuit to maintain the best working state of the transducer.

7. A system for reducing leakage inductance of a non-contact ultrasonic transducer based on the method according to any one of claims 1 to 6, characterized in that: The system includes an ultrasonic transducer, a GPIO control module, a relay control module, a leakage inductance detection module and a feedback control module. The ultrasonic transducer converts electrical energy into ultrasonic energy to drive an ultrasonic signal. The GPIO control module is used to control the relay to switch different capacitor groups. The relay control module is used to connect or disconnect different capacitor groups and select a suitable capacitor group according to the GPIO control signal. The leakage inductance detection module monitors the voltage, current and phase difference in real time through a sensor and calculates the leakage inductance in the circuit. The feedback control module determines whether the capacitance value needs to be adjusted through an algorithm based on the leakage inductance calculation result.

8. A system for reducing leakage inductance of a non-contact ultrasonic transducer according to claim 7, characterized in that: The system further comprises a capacitor group, which is composed of a plurality of capacitors with different capacitance values, and each capacitor group is connected to the ultrasonic transducer circuit via a relay.

9. The system for reducing leakage inductance of a non-contact ultrasonic transducer according to claim 7, characterized in that: The system further comprises a driving power supply module, which provides a driving signal for the ultrasonic transducer and transfers the ultrasonic energy emitted by the transducer to the working medium.

10. The system for reducing leakage inductance of a non-contact ultrasonic transducer according to claim 7, characterized in that: The GPIO control module is implemented by a single chip microcomputer or a microcontroller.

Images