CN112217482B - Electroacoustic transduction system and impedance matching control method thereof - Google Patents
Electroacoustic transduction system and impedance matching control method thereof Download PDFInfo
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/56—Modifications of input or output impedances, not otherwise provided for
- H03F1/565—Modifications of input or output impedances, not otherwise provided for using inductive elements
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H11/00—Networks using active elements
- H03H11/02—Multiple-port networks
- H03H11/28—Impedance matching networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
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Abstract
The invention discloses an electroacoustic transduction system and an impedance matching control method thereof, wherein the electroacoustic transduction system comprises a power amplifier; the power amplifier is connected with the impedance matching circuit; the impedance matching circuit is connected with a load. The impedance matching circuit comprises two thyristors which are connected in inverse parallel; the two thyristors which are reversely connected in parallel are connected in series with the inductor to form a series branch circuit; the series branch is connected in parallel with a capacitor. The invention can realize the dynamic self-adaptive impedance matching with wide frequency band and high precision under the conditions of different voltage output frequencies, different amplitude values and different load impedance of the power amplifier, solves the problems of limited power transmission and low power factor caused by inconsistent impedance of the digital power amplifier and the electroacoustic transducer, and realizes the dynamic self-adaptive and wide frequency band impedance matching, thereby improving the operation efficiency of the electroacoustic transduction system.
Description
Technical Field
The invention relates to the technical field of current transformation, in particular to an electroacoustic transduction system and an impedance matching control method thereof.
Background
Switching power electronic power amplifiers (hereinafter referred to as power amplifiers) have characteristics of small loss and large power as compared with conventional linear amplifiers, and have been rapidly developed in recent years. In particular, in electroacoustic transducer systems, the electroacoustic transducer is used as a driving power supply for electroacoustic transducers and other equipment, and has the characteristics of high power, wide frequency band, high fidelity and high efficiency. Electroacoustic transducer systems are indispensable in the fields of marine underwater telecommunication, underwater active detection and the like. How to ensure the maximum output power and the maximum conversion efficiency of the power amplifier and the electroacoustic transducer is significant for the ocean engineering equipment of the electroacoustic transducer system.
An important factor affecting the output power of a power amplifier is whether the impedance of the load (hereinafter referred to as load) of the electroacoustic transducer is consistent with the output characteristic impedance of the power amplifier, i.e. whether the impedance is matched. If the signals are not matched, the whole electroacoustic transduction system has the problems of limited power transmission and low power factor, and the output sound source level and the underwater sound signal quality are affected. In a giant magnetostrictive electroacoustic transduction system, the output impedance and the load impedance of a power amplifier are inductive, so that the power factor of the system is low and the output efficiency is low. The traditional impedance matching network consists of a high-cost and large-volume adjustable capacitor, and the traditional impedance matching network needs to be manually switched and cannot be adjusted in a self-adaptive mode. In addition, when the output frequency of the power amplifier changes, the load impedance also changes, so that the problems of poor matching precision and high matching difficulty of the traditional fixed impedance matching system are caused. Therefore, the research on the broadband self-adaptive impedance matching circuit has important practical significance for the electroacoustic transduction system.
The "impedance matching device" (publication No. 107636959B, publication No. 2018, 12, 18) can match the impedance of the high-frequency supply side with the impedance of the load side. However, it requires a variable reactor, which has the disadvantages of being bulky, costly, and not continuously and dynamically adjustable. The impedance matching method and the impedance matching system (publication number: 105594122B, publication date: 2019, 03, 08) and the impedance matching circuit (publication number: 108075736A, publication date: 2018, 05, 25) are both applied to the field of radio frequency emission, and the driving frequency is changed to match with a power source to emit radio frequency. However, none of them take into account the effect of load reactive on system efficiency and accuracy.
A transformer type adjustable reactor and a static reactive compensator formed by the same (patent number: ZL200410060664.3, grant bulletin day: 8 month 29 of 2007) disclose a method for forming a transformer, a thyristor, a reactor and a capacitor into the static reactive compensator to provide reactive power. The invention is connected with the load in parallel through the transformer, provides reactive power with the same amplitude and opposite polarity as the load, ensures the unchanged load power and reduces the output power of the power supply. The defects are that: the transformer has large structure volume and complex structure, is only suitable for high power, can be regulated in a grading way, and can only work under the condition that the output frequency of a power supply is the power frequency.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an electroacoustic transduction system and an impedance matching control method thereof, solves the problems of limited power transmission and low power factor caused by inconsistent impedance of a digital power amplifier and an electroacoustic transducer, and realizes dynamic self-adaption and broadband impedance network matching, thereby improving the operation efficiency of the electroacoustic transduction system.
In order to solve the technical problems, the invention adopts the following technical scheme: an electroacoustic transduction system comprising a power amplifier; the power amplifier is connected with the impedance matching circuit; the impedance matching circuit is connected with a load.
According to the invention, the impedance matching circuit is connected between the power amplifier and the load, and the impedance of the load side can be matched with the output impedance of the power amplifier through the impedance matching circuit, so that the problems of low efficiency and poor precision of the output signal of the power amplifier are solved.
The load impedance value which can be matched by the invention has a range, and the matching network needs to be ensured to match all possible load conditions, and L is selected by the range PF 、C PF Is determined by the value of (2). Therefore, the invention needs to carry out L according to the range of the load impedance to be matched PF 、C PF The values are designed in advance. The capacitance value C of the capacitor PF The method meets the following conditions:the inductance value L PF The method meets the following conditions: />f is the voltage v at two ends of the impedance matching circuit CPF Is a frequency of (2); v (V) L Representing the voltage v across the load L Is effective in terms of the effective value of (2); q (Q) L(Max) For maximum reactive power of load, Q L(Min) Is the minimum value of the reactive power of the load.
The impedance matching circuit comprises two thyristors which are connected in inverse parallel; the two thyristors which are reversely connected in parallel are connected in series with the inductor to form a series branch circuit; the series branch is connected in parallel with a capacitor. The reactive power required by the load can be obtained through sampling and calculating of voltage and current sensors, then equivalent impedance value required by an impedance matching circuit is obtained through calculation, and finally the triggering angle value required by the thyristor is obtained through calculation. The voltage phase angles and the frequency at two ends of the impedance matching circuit can be obtained through a broadband phase-locked loop (PLL), the trigger signals of the thyristors can be obtained through real-time comparison of the phase angles at two ends of the impedance matching circuit and the trigger angles of the thyristors obtained through calculation, and the effect of impedance matching is achieved through continuous triggering and switching-off of the thyristors. The entire impedance matching circuit can be considered as a variable impedance circuit whose equivalent impedance can be adjusted according to load and amplifier output variations.
The power amplifier control process includes:
1) Calculating the output voltage v of the power amplifier C And a reference voltage value v C * Is calculated by a proportional-integral-derivative controller s * ；
2) Calculation of i s * And power amplifier output current i s The error is passed through a proportional-integral-derivative controller to obtain a reference value of the current required to be output by the power amplifier;
3) And (3) modulating a reference value of the current required to be output by the power amplifier through PWM, and outputting a pulse trigger signal.
The power amplifier (digital power amplifier) described above may perform a power amplification process based on the reference signal waveform. The power amplifier has the advantage that the power amplitude of the output signal of the amplifier received by the load is continuously, adjustably and accurately amplified according to the requirement compared with the traditional power amplifier.
The invention also provides an impedance matching control method of the electroacoustic transduction system, which comprises the following steps:
1) Calculating the voltage v across the impedance matching circuit CPF Phase angle θ and frequency f;
2) Calculating the instantaneous reactive power of the load by using the phase angle theta and the frequency f;
3) Calculating matching impedance based on the instantaneous reactive power of the load to obtain a trigger angle alpha of a thyristor in an impedance matching circuit;
4) Comparing the voltage v across the impedance matching circuit CPF The phase angle theta of the thyristor and the triggering angle alpha of the thyristor are obtained;
5) And continuously triggering the thyristor through a trigger signal to obtain an impedance value which is required to be matched by a load.
The two thyristors connected in inverse parallel can control the equivalent size of the current flowing through the thyristors by controlling the opening time length, so that the thyristors are connected in series with the matching inductor to be equivalent to an adjustable inductor, and then the whole thyristors are connected in parallel with the matching capacitor to be equivalent to an adjustable capacitor. The load in an electroacoustic transducer system is typically an inductive load, and the impedance matching network may be equivalently a controllable and adjustable equivalent capacitive impedance. The control method is as follows, and the control method is made to be equal to the magnitude of the load inductive impedance value and capacitive under various load changes. The matching process is completed, and finally the energy transfer efficiency of the power amplifier is improved.
In step 1), the voltage v across the impedance matching circuit can be calculated under different amplifier output frequencies by a wideband phase locked loop CPF Phase angle θ and frequency f.
In step 2), the calculation process of the load transient reactive power comprises the following steps: the voltage v across the load L Current i L Delay of 1/(4 f) time length is performed to obtain v L D I L D Calculating the instantaneous reactive power of the load end by the formula (1), wherein p L For instantaneous active power, q L Is instantaneous reactive power. Based on the instantaneous calculation formula, the control system can calculate the result instantaneously and control the following steps in real time.
In step 3), the equivalent impedance X required by the impedance matching circuit is calculated by the formula (2) SVC The equivalent impedance X SVC I.e. matching the impedance. Based on the proposed impedance matching network, the matching impedance values to be generated can be adjusted according to different load impedance conditions in real time. V (V) CPF And V L Respectively represent the voltages v at two ends of the impedance matching circuit CPF Effective value and voltage v across load L Is effective in terms of the effective value of (2); q (Q) SVC And Q L Representing the capacitive reactive power of the impedance matching circuit and the inductive reactive power of the load, respectively.
In step 3), the fast impedance lookup table under different trigger angles is pre-established according to the formula (3), and the fast impedance lookup table is used when the load changes and is matched with the impedance X SVC The firing angle alpha of the thyristor is obtained. Based on the fast lookup table, the requirement of industrial application on the calculated amount can be reduced, so that the calculation of the matching impedance triggering angle under different conditions can be rapidly carried out.
X CPF 、X LPF Respectively, capacitance C in impedance matching circuit PF Inductance L PF Is a constant current source.
The specific implementation process of the step 4) comprises the following steps: comparing the voltage v across the impedance matching circuit CPF And the firing angle alpha of the thyristor, when theta>Alpha, outputting trigger signal T of one thyristor in impedance matching circuit 1 The method comprises the steps of carrying out a first treatment on the surface of the Calculating 180-alpha, comparing theta with 180-alpha, when theta>180 ° - α outputting trigger signal T of another thyristor in the impedance matching circuit 2 . General purpose medicineThe over-control makes two thyristors connected in reverse parallel conduct continuously in a continuous control period, so as to achieve the effect of continuously matching load impedance.
In step 5), after the thyristor is continuously triggered by the trigger signal, the equivalent impedance presented by the impedance matching circuit is the impedance value required to be matched by the load; preferably, when the trigger angle α=0°, the two thyristors of the impedance matching circuit are turned on successively; when the firing angle α=90°, two thyristors of the impedance matching circuit are turned off. By continuously controlling the thyristors, the proposed matching structure can maintain a stable impedance value when the load impedance is unchanged, and can also adjust the impedance value according to the impedance change of the load network so as to adapt to the impedance change. The continuous conduction refers to alternate conduction of two thyristors in the impedance matching circuit. At the firing angle α=90°, the two thyristors of the impedance matching circuit remain non-conductive at all times.
Compared with the prior art, the invention has the following beneficial effects:
1) Matching with the load, the whole system becomes pure resistive, and the power received by the load and the output efficiency of the power amplifier are improved;
2) Compared with the existing impedance matching device, the invention has simple structure and does not need a large amount of large-volume equipment such as transformers, reactors and the like in the prior art. The method can realize wide-band, high-precision and self-adaptive continuous impedance matching under different voltage output frequencies and amplitude values of the power amplifier and different load impedance conditions, solves the problems of limited power transmission and low power factor caused by inconsistent impedance of the digital power amplifier and the electroacoustic transducer, and realizes dynamic self-adaptive and wide-band impedance network matching, thereby improving the operation efficiency of an ultrasonic transduction system.
Drawings
FIG. 1 is a schematic diagram of a broadband impedance matching circuit and its layout;
FIG. 2 is a control block diagram of the present invention;
FIG. 3 is a graph of transient voltage versus current on the load side and amplifier side before and after changing the frequency of the output voltage of the amplifier for load matching using the present invention in a simulation example;
fig. 4 is a graph of transient voltage versus current on the load side and amplifier side before and after changing the amplitude of the output voltage of the amplifier using the present invention for load matching in a simulation example.
Detailed Description
Referring to fig. 1, the digital power amplifier includes a fully controlled power electronics T a ，T b ，/>(MOSFET or IGBT), providing DC voltage V dc Direct current capacitance C of (2) dc The output inductance L and the output capacitance C form an H-bridge active inverter by 4 fully-controlled devices, and the DC side of the active inverter is connected with the DC capacitance C dc The output side of the active inverter is sequentially connected with an output inductor L and an output capacitor C in series at two ends, and a load is connected to the two ends of C in parallel to obtain the output v of the power amplifier C The method comprises the steps of carrying out a first treatment on the surface of the The impedance matching circuit comprises 2 thyristors T which are connected in inverse parallel 1 And T 2 Inductance L PF Capacitance C PF Anti-parallel thyristor and inductor L PF Series circuit and capacitor C formed by series connection of two PF The thyristors are alternately switched on in parallel, and the time length of switching on and switching off is changed by changing the triggering angle alpha, so that the input capacitance value is changed, and broadband self-adaptive impedance matching is performed.
Referring to fig. 2, the digital power amplifier control process includes the steps of:
step 1: calculating the output voltage v C And a reference voltage value v C * Calculating the reference value i of the current through a proportional integral derivative controller (PID) s * ；
Step 2: and then i s * And output current i s Comparing the errors, and calculating a reference value of the current to be output at the moment through PID;
step 3: finally, pulse triggering signals are output to a power electronic device (MOSFET or IGBT) through Pulse Width Modulation (PWM).
The invention uses a broadband PLL to calculate the voltage v across the impedance matching circuit in real time CPF Phase angle θ and frequency f. Then according to the voltage v across the load L And current i L And calculating the instantaneous reactive power of the load, wherein the impedance matching circuit needs to match the reactive power of the load so that the sum of reactive powers of the system is zero. Based on the obtained reactive power, the required matching impedance can be calculated, and the required thyristor firing angle alpha can be obtained by comparing a preset firing angle impedance corresponding lookup table (LUT). The trigger signal of the thyristor can be obtained in real time by continuously comparing the phase angle theta at the two ends of the impedance matching circuit with the trigger angle alpha of the thyristor obtained by the calculation. The final impedance matching circuit can generate equivalent impedance values to be matched, and finally the impedance matching process is completed. Referring to fig. 2, the control process of the impedance matching circuit includes the steps of:
step 1: v CPF Calculating the instantaneous voltage phase angle theta and the frequency f of the power supply in real time through a broadband phase-locked loop (PLL);
step 2: the voltage v across the load L Current i L Making a delay of 1/(4 f) time length to obtain v L D I L D Calculating the equation (1) to obtain the instantaneous power of the load end, wherein p L For instantaneous active power, q L Is instantaneous reactive power; the calculation of the formula (2) is carried out again to obtain the equivalent impedance X required by the load matching circuit (1) SVC The method comprises the steps of carrying out a first treatment on the surface of the Step 3: by adjusting different trigger angles alpha (0-90 degrees), the equivalent impedance value of the impedance matching circuit (1) can be changed, and the equivalent impedance value under different trigger angles is determined by a formula (3), wherein X is shown as the following formula (3) CPF 、X LPF Respectively the capacitance C PF Inductance L PF Equivalent impedance of (a); meanwhile, a fast impedance lookup table (LUT) under different alpha can be pre-established according to the formula (3), and the LUT can be used for X according to requirements when the load changes SVC To quickly find the trigger angle alpha;
step 4: comparing θ and α, when θ>Alpha is one of the thyristorsTrigger signal T of (2) 1 . In addition, a value of 180 ° - α is calculated, θ is compared with 180 ° - α, when θ>180 ° - α outputting trigger signal T of another thyristor 2 . After the thyristor is continuously triggered by the trigger signal, the equivalent impedance presented by the load impedance matching circuit is the impedance value required to be matched by the load.
Because the load impedance value which can be matched by the invention has a range, the matching network needs to be ensured to be capable of matching all possible load conditions, and L is selected by the range PF 、C PF Is determined by the value of (2). Therefore, the invention needs to carry out L according to the range of the load impedance to be matched PF 、C PF The values are designed in advance. The invention provides an impedance matching circuit and a design method thereof, wherein the impedance matching circuit comprises the following steps: according to all possible load conditions, including 1) load change conditions; 2) Under the condition that the amplifiers output different frequencies, the maximum possible inductive reactive power designs the parallel capacitor, and the minimum possible inductive reactive power designs the series inductor.
The determination of the parameters of each component comprises the following steps:
the adjusting range of the trigger angle alpha is 0-90 degrees, and when the trigger angle alpha=0 degrees, the thyristors of the impedance matching circuit are continuously conducted, which is equivalent to the capacitor C PF And inductance L PF In parallel, providing minimum capacitive reactive power Q SVC ( Min ) At this time Q SVC ( Min )≥-Q L ( Min ) Wherein Q is L ( Min ) Minimum inductive reactive power of the load;
when the trigger angle alpha=90°, the thyristor of the impedance matching circuit is completely turned off, which corresponds to the capacitor C PF In series with the load network, which provides the maximum capacitive reactive power Q SVC ( Max ) (maximum inductive reactive Power Q of corresponding load) L ( Max ) At this time Q SVC ( Max )≤-Q L ( Max ). Capacitor C PF Inductance L PF The value of (2) can be determined by the formulas (4) and (5).
Referring to fig. 3 and 4, several working conditions in a simulation example of the present invention are shown:
the simulation example is used for verifying the self-adaptive broadband impedance matching circuit based on the controllable thyristor, and the self-adaptive broadband impedance matching circuit can effectively operate in the amplifier system under different output frequencies and amplitudes. So 2 different dynamic working processes are shown in the simulation, namely: 1) After the impedance matching circuit is connected to work, the output frequency f of the amplifier is increased from 300Hz to 500Hz, see FIG. 3; 2) After the impedance matching circuit is connected into operation, the effective value of the output voltage of the amplifier is increased from 220V to 300V, see FIG. 4.
An impedance matching circuit is connected in series between a power amplifier and a load thereof, the power amplifier can change the amplitude and frequency of output voltage (dynamic voltage amplitude and frequency change are used for demonstration in simulation), the impedance matching circuit can change the system from inductance to pure resistance (relative phase and power factor of voltage and current are used for demonstration in simulation), the structure schematic diagram of the system is shown in fig. 1, the control method part is shown in fig. 2, and the demonstration diagram of simulation effect is shown in fig. 3 and 4.
Power amplifier system parameters:
DC voltage V dc =500V, output voltage range: v (V) L =220V to 300V, output frequency range: f=300 Hz to 500Hz.
Impedance matching network system parameters:
a parallel capacitor: c (C) PF Series inductor=10 μf: l (L) PF ＝10mH。
Load part parameters:
equivalent inductance value: l=30mh, equivalent resistance value: r=10Ω.
The following cases are the results in simulation using the present invention.
Referring to fig. 3, at 0 ms-4 ms, the power amplifier outputs a voltage with a frequency of 300Hz to the load network, but the load current lags behind the voltage due to the existence of a large amount of inductive reactive power on the load side, and the power factor is 0.27, which greatly reduces the power output efficiency of the amplifier. But on the amplifier side of the load matching circuit, the voltage and the current are adjusted to the same phase, the power factor is improved to 0.99, and the output efficiency of the amplifier is improved. The output frequency of the amplifier is increased to 500Hz at the moment of 4ms, and at the moment, the self-adaptive impedance matching circuit can still keep the current and the voltage at the side of the amplifier in the same phase and the power factor of 0.99 after a transient process (6 ms). This simulation demonstrates that the impedance matching of the present invention can operate over a wide frequency band and has an adaptive function. The data summary of this simulation is presented in table 1.
Table 1 summary of simulation of an impedance matching circuit operating in a state where the amplifier outputs different voltage frequencies
| 0～4ms | 4ms～14ms | |
| System change | - | Power amplifier changing output frequency |
| Amplifier frequency output | 300Hz | 500Hz |
| Load side reactive power | 22kVar | 28kVar |
| Amplifier side reactive power | 2kVar | -2kVar |
| Load side power factor | 0.27 | 0.23 |
| Power supply side current power factor | 0.99 | 0.99 |
Referring to fig. 3, at 0 ms-4 ms, the power amplifier outputs a voltage of 220V to the load network, but the load current lags behind the voltage due to the existence of a large amount of inductive reactive power at the load side, and the power factor is 0.27, so that the power output efficiency of the amplifier is greatly reduced. But on the amplifier side of the load matching circuit, the voltage and the current are adjusted to the same phase, the power factor is improved to 0.99, and the output efficiency of the amplifier is improved. The output of the amplifier is raised to 300V at the moment of 4ms, and the adaptive impedance matching circuit can still keep the current and the voltage at the side of the amplifier in the same phase and the power factor of 0.99 after a transient process (2 ms). This simulation demonstrates that the impedance matching of the present invention can operate at different voltage output conditions and has an adaptive function. The data for this simulation are summarized in table 2.
Table 2 summary of simulation of the impedance matching circuit operating with different voltage amplitudes output by the amplifier
| 0～4ms | 4ms～14ms | |
| System change | - | Power amplifier changing output voltage amplitude |
| Amplifier voltage output | 220V | 300V |
| Load side reactive power | 22kVar | 40kVar |
| Amplifier side reactive power | 2kVar | -1kVar |
| Load side power factor | 0.27 | 0.27 |
| Power supply side current power factor | 0.99 | 0.99 |
The simulation result verifies that the impedance matching circuit provided by the invention can adaptively match the load impedance in a wide frequency band so as to improve the power factor and finally improve the operation efficiency of the amplifier system.
Claims (10)
1. An electroacoustic transducer system comprising a power amplifier; the power amplifier is connected with the impedance matching circuit; the impedance matching circuit is connected with a load;
the impedance matching circuit comprises two thyristors which are connected in inverse parallel; the two thyristors which are reversely connected in parallel are connected in series with the inductor to form a series branch circuit; the serial branch is connected with the capacitor in parallel;
the capacitance value C of the capacitor PF The method meets the following conditions:the inductance value L PF The method meets the following conditions:
f is the voltage v at two ends of the impedance matching circuit CPF Is a frequency of (2); v (V) L Representing the voltage v across the load L Is effective in terms of the effective value of (2); q (Q) L(Max) For maximum reactive power of load, Q L(Min) Is the minimum value of the reactive power of the load.
2. The electroacoustic transduction system of claim 1, wherein the power amplifier control process comprises:
1) Calculating the output voltage v of the power amplifier C And a reference voltage value v C * Is calculated by a proportional-integral-derivative controller s * ；
2) Calculation of i s * And power amplifier output current i s The error is passed through a proportional-integral-derivative controller to obtain a reference value of the current required to be output by the power amplifier;
3) And (3) modulating a reference value of the current required to be output by the power amplifier through PWM, and outputting a pulse trigger signal.
3. A method of impedance matching control of an electroacoustic transducer system according to claim 1 or 2, characterized by comprising the steps of:
1) Calculating the voltage v across the impedance matching circuit CPF Phase angle θ and frequency f;
2) Calculating the instantaneous reactive power of the load by using the phase angle theta and the frequency f;
3) Calculating matching impedance based on the instantaneous reactive power of the load to obtain a trigger angle alpha of a thyristor in an impedance matching circuit;
4) Comparing the voltage v across the impedance matching circuit CPF The phase angle theta of the thyristor and the triggering angle alpha of the thyristor are obtained;
5) And triggering the thyristor continuously through a trigger signal to obtain the impedance value required to be matched by the load.
4. A method according to claim 3, wherein in step 1) the voltage v across the impedance matching circuit is calculated by a wideband phase locked loop CPF Phase angle θ and frequency f.
5. The method according to claim 4, wherein in step 2), the calculation of the load instantaneous reactive power comprises: the voltage v across the load L Current i L Delay of 1/(4 f) time length is performed to obtain v L D I L D By the formulaCalculating the instantaneous reactive power of the load end, wherein p L For instantaneous active power, q L Is instantaneous reactive power.
6. The method of claim 4, wherein in step 3), the method is performed by the formulaCalculating to obtain the equivalent impedance X required by the impedance matching circuit SVC The equivalent impedance X SVC I.e. matching the impedance; v (V) CPF And V L Respectively represent the voltages v at two ends of the impedance matching circuit CPF Effective value and voltage v across load L Is effective in terms of the effective value of (2); q (Q) SVC And Q L Representing the capacitive reactive power of the impedance matching circuit and the inductive reactive power of the load, respectively.
7. The method of claim 4, wherein in step 3), the formula is followedThe quick impedance searching table under different triggering angles is pre-established, and is used when the load changes and according to the matching impedance X SVC Acquiring a triggering angle alpha of a thyristor; x is X CPF 、X LPF Respectively, capacitance C in impedance matching circuit PF Inductance L PF Is a constant current source.
8. The method of claim 4, wherein the step 4) is performed by: comparing the voltage v across the impedance matching circuit CPF And the firing angle alpha of the thyristor, when theta>Alpha, outputting trigger signal T of one thyristor in impedance matching circuit 1 The method comprises the steps of carrying out a first treatment on the surface of the Calculating 180-alpha, comparing theta with 180-alpha, when theta>180 ° - α outputting trigger signal T of another thyristor in the impedance matching circuit 2 。
9. The method according to any one of claims 4 to 8, wherein in step 5), after the thyristors are continuously triggered by the trigger signal, the equivalent impedance presented by the impedance matching circuit is the impedance value to be matched by the load.
10. The method of claim 9, wherein when the firing angle α = 0 °, the two thyristors of the impedance matching circuit are turned on sequentially; when the firing angle α=90°, two thyristors of the impedance matching circuit are turned off.
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| CN113037230B (en) * | 2021-03-22 | 2022-06-24 | 湖南大学 | Impedance matching control method and system for electroacoustic transducer system |
| CN113612469B (en) * | 2021-07-27 | 2024-02-09 | 许继集团有限公司 | Impedance matching device of electronic switch controllable self-recovery circuit |
| CN114978919B (en) * | 2022-06-14 | 2024-01-09 | 湖南大学 | Method and device for widening bandwidth of transducer by using switch type non-foster system |
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| EP0096778A2 (en) * | 1982-06-14 | 1983-12-28 | Georg Neumann GmbH | Microphone |
| CN108882108A (en) * | 2018-07-05 | 2018-11-23 | 湖南大学 | It is applicable in the impedance matching system and its matching process of Yu Haiyang communication electroacoustic transducer |
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| EP0096778A2 (en) * | 1982-06-14 | 1983-12-28 | Georg Neumann GmbH | Microphone |
| CN108882108A (en) * | 2018-07-05 | 2018-11-23 | 湖南大学 | It is applicable in the impedance matching system and its matching process of Yu Haiyang communication electroacoustic transducer |
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