Self-adjusting impedance matching circuit suitable for variable load conditions and implementation method

Abstract

The present invention provides a self-adjusting impedance matching circuit suitable for variable load conditions and an implementation method, comprising: an underwater acoustic transducer variable load circuit, a broadband matching circuit under constant pressure, and a self-adjusting impedance matching circuit under variable voltage; the broadband matching circuit under constant pressure is designed based on the characteristics of the underwater acoustic transducer variable load circuit to ensure broadband matching efficiency; the self-adjusting impedance matching circuit under variable voltage is designed in combination with the pressure value fed back by a pressure sensor and the broadband matching circuit under constant pressure; the underwater acoustic transducer variable load circuit includes impedance characteristics under variable frequency and variable voltage, and the impedance state changes with changes in frequency and hydrostatic pressure; the broadband matching circuit under constant pressure completes good matching within the broadband under constant pressure; the self-adjusting impedance matching circuit under variable voltage self-adjusts the circuit matching state according to the pressure value fed back by the pressure sensor to cope with the circuit mismatch problem under variable voltage.

Description

Technical Field

[0001] The present invention relates to the technical field of impedance matching circuits for underwater acoustic transmitters, and in particular to a self-adjusting impedance matching circuit suitable for use under variable load conditions and an implementation method thereof. Background Art

[0002] Hydroacoustic technology is an important support for effective seabed operations, and the hydroacoustic transmitter is a key subsystem for realizing hydroacoustic technology. Impedance matching of the hydroacoustic transmitter mainly refers to designing a low-loss matching network between the power amplifier and the transducer load to achieve the purpose of increasing power gain within a certain frequency range.

[0003] The impedance of the underwater acoustic transducer will change significantly with the change of signal frequency. It is difficult to achieve a good power gain effect in the entire frequency band through simple matching within a wide frequency band. Therefore, it is necessary to design a suitable matching circuit as required to improve the broadband matching performance.

[0004] The impedance of the underwater acoustic transducer will change significantly with the change of the ambient water pressure (water depth). For the load in the variable depth working scenario, the use of a fixed matching circuit cannot adapt to the matching requirements within the full depth range. Therefore, it is very important to design a self-adjusting matching circuit.

[0005] The broadband matching of the underwater acoustic transmitter under constant pressure needs to be combined with the frequency band impedance characteristics of the underwater acoustic transducer, design a suitable matching topology, and use a high-precision algorithm to determine the topology parameters to achieve good matching under constant pressure.

[0006] The broadband matching of the underwater acoustic transmitter under variable pressure needs to be combined with the hydrostatic pressure impedance characteristics of the underwater acoustic transducer, and a controller based on depth (hydrostatic pressure) feedback is designed to adjust the matching state within the dynamic depth range to achieve good matching under variable pressure.

[0007] In order to meet the overall requirements, the size and weight of the underwater acoustic launch system will be restricted. The self-adjusting impedance matching circuit as a part of the launch system should also reduce the space and weight share as much as possible through measures such as component reuse while meeting the performance requirements. Summary of the invention

[0008] In view of the defects in the prior art, an object of the present invention is to provide a self-adjusting impedance matching circuit suitable for variable load conditions and an implementation method thereof.

[0009] The self-adjusting impedance matching circuit suitable for variable load conditions provided by the present invention comprises: a variable load circuit of an underwater acoustic transducer, a broadband matching circuit under constant voltage, and a self-adjusting impedance matching circuit under variable voltage;

[0010] Based on the characteristics of the variable load circuit of the underwater acoustic transducer, a broadband matching circuit under constant pressure is designed to ensure broadband matching efficiency; the pressure value fed back by the pressure sensor and the broadband matching circuit under constant pressure are combined to complete the design of the self-adjusting impedance matching circuit under variable pressure;

[0011] The variable load circuit of the underwater acoustic transducer includes impedance characteristics under variable frequency and variable voltage, and the impedance state changes with the change of frequency and hydrostatic pressure;

[0012] The broadband matching circuit under constant voltage achieves good matching within a broadband under constant voltage;

[0013] The voltage-variable self-adjusting impedance matching circuit self-adjusts the circuit matching state according to the pressure value fed back by the pressure sensor to cope with the circuit mismatch problem under voltage variation.

[0014] Preferably, a direct optimization method of circuit elements is used to design a high-order topology suitable for broadband matching, the topology parameters are optimized by a particle swarm algorithm, simulation verification is performed using MATLAB, and finally board manufacturing confirmation is performed.

[0015] Preferably, the high-order topology suitable for broadband matching is determined by the load impedance variation characteristics;

[0016] Taking the maximization of the matching efficiency of the circuit at different frequencies as the optimization goal, the particle swarm algorithm is used to optimize the topology parameters; the specific process is: after determining the optimization range, iterate and cycle continuously until the accuracy requirements are met, and finally output the optimized circuit topology parameters;

[0017] Substituting the measured impedance data of the underwater acoustic transducer, the optimization iteration process is implemented using MATLAB to calculate the optimal topological parameters of the high-order topology under different water pressures.

[0018] Preferably, a self-adjusting matching network is designed to compensate for the matching error caused by changes in hydrostatic pressure, specifically: the matching circuit parameters are dynamically adjusted in combination with the optimal matching circuit under different hydrostatic pressures and the feedback value of the pressure sensor, so as to always keep the circuit in a good matching state under any pressure.

[0019] Preferably, a circuit network with adjustable matching state is designed in combination with the impedance characteristics of the transmitting hydroacoustic transducer under different pressures. The scale of the matching circuit is reduced by multiplexing components between different matching states of the circuit network, and the matching state of the circuit network is dynamically adjusted by feedback of the hydrostatic pressure in which the hydroacoustic transducer is located.

[0020] Preferably, the matching state under the current pressure needs to meet the broadband matching circuit requirements of constant hydrostatic pressure. The circuit network adopts a high-order matching topology suitable for the current hydrostatic pressure. The parameters of the high-order matching topology adopted by the circuit network need to be determined through component optimization in combination with the load impedance. The component optimization under variable pressure adopted by the circuit network is achieved through the particle swarm algorithm.

[0021] Preferably, the circuit network state is adjusted through pressure feedback in combination with a PID control algorithm, specifically: using the pressure value transmitted by the pressure sensor as feedback to dynamically adjust the circuit topology parameters.

[0022] Preferably, the scale of the circuit network is determined by the largest matching topology within the pressure range of the hydroacoustic transducer.

[0023] Preferably, circuit elements are reused to reduce the scale, and the resistance, capacitance and inductance elements are connected in series and parallel to achieve the required values.

[0024] According to the present invention, a method for implementing a self-adjusting impedance matching circuit suitable for use under variable load conditions includes:

[0025] Step 1: Obtain the impedance characteristic law of the transmitting underwater acoustic transducer under variable frequency and variable voltage;

[0026] Step 2: Complete the broadband matching circuit design under constant voltage based on the impedance characteristics under variable frequency;

[0027] Step 3: Complete the design of the self-adjusting circuit under voltage transformation in combination with the impedance characteristic law under voltage transformation;

[0028] Step 4: Based on the broadband matching circuits for different working hydrostatic pressures, combined with pressure feedback, a self-adjusting matching network design is performed on the circuit to ensure that the broadband matching effect meets the preset requirements within the dynamic pressure range.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The present invention solves the circuit mismatch problem under variable load working conditions by adopting a self-adjusting impedance matching circuit, achieves good circuit matching, improves system power factor, and reduces power demand and circuit loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0032] Figure 1 Design a flow chart for broadband matching circuit under constant voltage;

[0033] Figure 2 Design a flow chart for the self-adjusting impedance matching circuit under voltage transformation;

[0034] Figure 3 Design a flow chart for impedance matching circuit under variable load conditions;

[0035] Figure 4 This is the optimization effect diagram of the constant voltage broadband matching circuit;

[0036] Figure 5 This is a diagram of the self-adjustment effect of the transformer impedance matching circuit. DETAILED DESCRIPTION

[0037] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0038] Example

[0039] The present invention provides a self-adjusting impedance matching circuit suitable for variable load conditions, comprising: an underwater acoustic transducer variable load circuit, a broadband matching circuit under constant voltage, and a self-adjusting impedance matching circuit under variable voltage; wherein the impedance circuits under variable frequency and variable voltage constitute the underwater acoustic transducer variable load circuit; the broadband matching circuit under constant voltage is designed in combination with the characteristics of the impedance circuit under variable frequency; and the self-adjusting impedance matching circuit is designed in combination with the characteristics of the impedance circuit under variable voltage and the broadband matching circuit under constant voltage.

[0040] The underwater acoustic transducer is generally capacitive, and the change of its impedance characteristics is mainly manifested in the two aspects of frequency conversion and voltage conversion in application. The impedance state will change with the change of frequency and hydrostatic pressure.

[0041] Before designing a specific impedance matching circuit, the impedance characteristics of the transducer under variable frequency and voltage are tested to understand the impedance change law of the underwater acoustic transducer variable load circuit; the load of the capacitive transducer is specifically manifested in that its internal equivalent capacitance and conductance will shift when the signal frequency changes or the external environmental water pressure changes.

[0042] The broadband matching circuit under constant voltage is designed for the impedance variation characteristics of the transducer under variable frequency conditions, ensuring that the transmitting system has a good matching effect in a wide frequency band;

[0043] The broadband matching circuit under constant voltage needs to select a suitable matching topology;

[0044] Broadband matching circuits under constant voltage require accurate selection of topological parameters;

[0045] This design uses the direct optimization method of circuit elements to design a high-order topology suitable for broadband matching, optimizes the topology parameters through the particle swarm algorithm, uses MATLAB for simulation verification, and finally confirms the board making. The broadband matching topology is determined by the load impedance change characteristics. The particle swarm algorithm is used to optimize the topology parameters with the optimization goal of maximizing the matching efficiency of the circuit at different frequencies. The measured impedance data of the underwater acoustic transducer is substituted, and MATLAB is used to calculate the optimal topology parameters of the high-order topology under different water pressures.

[0046] The broadband matching circuit under constant voltage needs to achieve the goals of narrowing the system impedance variation range, flat transmitting voltage response and high transmitting efficiency.

[0047] Due to the impedance variation of the transmitting transducer itself, the matching effect of the same matching circuit at different working depths varies greatly.

[0048] The adaptive high-order circuit topology can improve the broadband matching effect. At the same time, a self-adjusting matching network needs to be designed to compensate for the matching error caused by the change of hydrostatic pressure, so as to promote the efficient and stable operation of the underwater acoustic emission system. Specifically, the matching circuit parameters are dynamically adjusted by combining the optimal matching circuit under different hydrostatic pressures and the feedback value of the depth sensor, so as to keep the circuit in a good matching state at any depth.

[0049] Combined with the impedance characteristics of the transmitting transducer at different depths, a circuit network with adjustable matching state is designed;

[0050] The scale of the matching circuit is reduced by reusing components between different matching states of the circuit network, which is specifically manifested in combining components with determined parameters based on the principle of "big contains small, small group is large";

[0051] Dynamically adjust the matching state of the circuit network through feedback of the transducer's depth (hydrostatic pressure);

[0052] The impedance of the transducer changes relatively slowly with water depth (hydrostatic pressure), and frequent switching can be avoided through discrete control;

[0053] The matching state at the current depth must meet the broadband matching circuit requirements for a constant static water pressure (water depth);

[0054] The circuit network adopts a high-order matching topology suitable for the current hydrostatic pressure (depth);

[0055] The parameters of the high-order matching topology used in the circuit network need to be determined through component optimization in combination with the load impedance;

[0056] The component optimization under variable depth adopted by the circuit network is realized by particle swarm algorithm;

[0057] The circuit network status is adjusted through depth feedback combined with the PID control algorithm. Specifically, the depth (pressure) value transmitted by the depth (pressure) sensor is used as feedback to dynamically adjust the circuit topology parameters.

[0058] The size of the circuit network is determined by the largest matching topology within the pressure range of the transducer;

[0059] Circuit components are reused to reduce the scale. The principle is that the resistance, capacitance and inductance components are connected in series and parallel to achieve the required value.

[0060] The design of the self-adjusting matching circuit under variable load conditions of the transmitting system includes several main processes, the steps are:

[0061] Step 1: Clarify the impedance characteristics of the transmitting transducer under frequency and voltage conversion;

[0062] Step 2: Complete the broadband matching circuit design under constant voltage based on the impedance characteristics under variable frequency;

[0063] Step 3: Complete the design of the self-adjusting circuit under voltage transformation in combination with the impedance characteristic law under voltage transformation;

[0064] Step 4: Based on the broadband matching circuit at different working depths (hydrostatic pressure), combined with depth feedback, a self-adjusting matching network design is performed on the circuit to ensure good broadband matching effect within the dynamic depth range.

[0065] according to Figure 1 The design flow chart of broadband matching circuit under constant pressure is shown in the figure, in which the impedance matching circuit topology needs to be clarified according to the particle swarm optimization strategy of network parameters by combining the load equivalent capacitance characteristics, load equivalent conductance characteristics and information provided by the water depth (pressure) feedback module under different pressures after the framework is determined;

[0066] according to Figure 2 The design flow chart of the self-adjusting impedance matching circuit under voltage transformation is shown. After the circuit topology design under constant voltage and the self-adjusting circuit design under voltage transformation are determined, the circuit scale is reduced by using the component reuse strategy, and the hardware is realized by combining the discrete switching control based on PID.

[0067] according to Figure 3 The impedance matching circuit design flow chart under variable load conditions shown in the figure, based on understanding the impedance change characteristics under load variable frequency and voltage, uses particle swarm optimization (PSO) and PID matching adjustment strategies in the impedance matching circuit design process under variable load conditions to determine an effective broadband matching circuit within the dynamic pressure range, and at the same time reduces the circuit scale through component reuse, ultimately forming a refined high-performance self-adjusting impedance matching circuit under variable load conditions;

[0068] according to Figure 4 The constant-pressure broadband matching circuit optimization effect diagram shown in the figure achieves the constant-pressure broadband matching circuit optimization effect through broadband matching topology design and parameter optimization at a certain fixed water depth (pressure), wherein the power factor is greatly improved overall, thereby improving the transmission efficiency of the system at a constant pressure;

[0069] according to Figure 5The self-adjusting effect diagram of the transformer impedance matching circuit shown in the figure achieves the self-adjusting effect of the transformer impedance matching circuit through the design of the self-adjusting impedance matching network within the dynamic water depth (pressure) range, in which the power factor is greatly improved overall, thereby improving the output efficiency of the system within the full working depth.

[0070] Those skilled in the art know that, in addition to implementing the system, device and its various modules provided by the present invention in a purely computer-readable program code, it is entirely possible to implement the same program in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers and embedded microcontrollers by logically programming the method steps. Therefore, the system, device and its various modules provided by the present invention can be considered as a hardware component, and the modules included therein for implementing various programs can also be considered as structures within the hardware component; the modules for implementing various functions can also be considered as both software programs for implementing the method and structures within the hardware component.

[0071] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A self-adjusting impedance matching circuit suitable for use under variable load conditions, characterized in that: include: Underwater acoustic transducer variable load circuit, broadband matching circuit under constant voltage, self-adjusting impedance matching circuit under variable voltage; Based on the characteristics of the variable load circuit of the underwater acoustic transducer, a broadband matching circuit under constant pressure is designed to ensure broadband matching efficiency; the pressure value fed back by the pressure sensor and the broadband matching circuit under constant pressure are combined to complete the design of the self-adjusting impedance matching circuit under variable pressure; The variable load circuit of the underwater acoustic transducer includes impedance characteristics under variable frequency and variable voltage, and the impedance state changes with the change of frequency and hydrostatic pressure; The broadband matching circuit under constant voltage achieves good matching within a broadband under constant voltage; The voltage-variable self-adjusting impedance matching circuit self-adjusts the circuit matching state according to the pressure value fed back by the pressure sensor to cope with the circuit mismatch problem under voltage variation.

2. The self-adjusting impedance matching circuit suitable for variable load conditions according to claim 1, characterized in that: The circuit element direct optimization method is used to design a high-order topology suitable for broadband matching. The topology parameters are optimized using the particle swarm algorithm, and simulation verification is performed using MATLAB. Finally, board manufacturing is performed for confirmation.

3. The self-adjusting impedance matching circuit suitable for variable load conditions according to claim 2, characterized in that: The high-order topology suitable for broadband matching is determined by the load impedance variation characteristics; Taking the maximization of the matching efficiency of the circuit at different frequencies as the optimization goal, the particle swarm algorithm is used to optimize the topology parameters; the specific process is: after determining the optimization range, iterate and cycle continuously until the accuracy requirements are met, and finally output the optimized circuit topology parameters; Substituting the measured impedance data of the underwater acoustic transducer, the optimization iteration process is implemented using MATLAB to calculate the optimal topological parameters of the high-order topology under different water pressures.

4. The self-adjusting impedance matching circuit suitable for variable load conditions according to claim 3, characterized in that: A self-adjusting matching network is designed to compensate for the matching error caused by the change of hydrostatic pressure. Specifically, the matching circuit parameters are dynamically adjusted based on the optimal matching circuit under different hydrostatic pressures and the feedback value of the pressure sensor, so that the circuit is always kept in a good matching state under any pressure.

5. The self-adjusting impedance matching circuit suitable for variable load conditions according to claim 4, characterized in that: Based on the impedance characteristics of the transmitting underwater acoustic transducer under different pressures, a circuit network with adjustable matching state is designed. The scale of the matching circuit is reduced by reusing components between different matching states of the circuit network, and the matching state of the circuit network is dynamically adjusted by feedback of the static water pressure of the underwater acoustic transducer.

6. The self-adjusting impedance matching circuit suitable for variable load conditions according to claim 5, characterized in that: The matching state under the current pressure needs to meet the broadband matching circuit requirements of constant hydrostatic pressure. The circuit network adopts a high-order matching topology suitable for the current hydrostatic pressure. The parameters of the high-order matching topology used in the circuit network need to be determined through component optimization in combination with the load impedance. The component optimization used in the circuit network is achieved through the particle swarm algorithm.

7. The self-adjusting impedance matching circuit suitable for variable load conditions according to claim 5, characterized in that: The circuit network state is adjusted through pressure feedback combined with a PID control algorithm. Specifically, the pressure value transmitted by the pressure sensor is used as feedback to dynamically adjust the circuit topology parameters.

8. The self-adjusting impedance matching circuit suitable for variable load conditions according to claim 5, characterized in that: The scale of the circuit network is determined by the largest matching topology within the pressure range of the hydroacoustic transducer.

9. The self-adjusting impedance matching circuit suitable for variable load conditions according to claim 5, characterized in that: Circuit components are reused to reduce scale, and resistors, capacitors and inductors are connected in series and parallel to achieve the required values.

10. A method for implementing a self-adjusting impedance matching circuit suitable for variable load conditions according to any one of claims 1 to 9, characterized in that: include: Step 1: Obtain the impedance characteristic law of the transmitting underwater acoustic transducer under variable frequency and variable voltage; Step 2: Complete the broadband matching circuit design under constant voltage based on the impedance characteristics under variable frequency; Step 3: Complete the design of the self-adjusting circuit under voltage transformation in combination with the impedance characteristic law under voltage transformation; Step 4: Based on the broadband matching circuits for different working hydrostatic pressures, combined with pressure feedback, a self-adjusting matching network design is performed on the circuit to ensure that the broadband matching effect meets the preset requirements within the dynamic pressure range.

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