CN112217482A - Electroacoustic transducer system and impedance matching control method thereof - Google Patents
Electroacoustic transducer 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
- H04R3/00—Circuits for transducers, loudspeakers or microphones
Abstract
The invention discloses an electroacoustic transducer system and an impedance matching control method thereof, wherein the electroacoustic transducer 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 reverse parallel; the two thyristors in inverse parallel connection are connected with the inductor in series to form a series branch circuit; the series branch is connected with the capacitor in parallel. The invention can realize the dynamic adaptive impedance matching with wide frequency band and high precision under the conditions of different voltage output frequencies and amplitudes of the power amplifier and different load impedances, solves the problems of limited power transmission and low power factor caused by inconsistent impedance of the digital power amplifier and the electroacoustic transducer, realizes the impedance matching of the dynamic adaptive and wide frequency band, and can improve the operating efficiency of the electroacoustic transducer system.
Description
Technical Field
The invention relates to the technical field of current transformation, in particular to an electroacoustic transducer system and an impedance matching control method thereof.
Background
Compared with a traditional linear amplifier, a switching power electronic power amplifier (hereinafter referred to as a power amplifier) has the characteristics of small loss and high power, and the development is rapid in recent years. Particularly, in an electroacoustic transducer system, the high-power high-frequency high-fidelity high-frequency drive power supply is used as a drive power supply of electroacoustic transducers and other equipment and has the characteristics of high power, wide frequency band, high fidelity and high efficiency. The electroacoustic transducer system is indispensable in the fields of ocean underwater remote communication, underwater active detection and the like. How to guarantee the maximum output power and the maximum conversion efficiency of the power amplifier and the electroacoustic transducer is significant for ocean engineering equipment, namely an electroacoustic transducer system.
An important factor affecting the output power of the power amplifier is whether the impedance of the load of the electro-acoustic transducer (hereinafter referred to as the load) coincides with the characteristic impedance of the output of the power amplifier, i.e., whether the impedance is matched. If not matched, the whole electroacoustic transducer system has the problems of limited power transmission and low power factor, and the output sound source level and the quality of the underwater sound signal are influenced. In the giant magnetostrictive electroacoustic transducer system, the output impedance and the load impedance of the power amplifier are inductive, which results in a low power factor and low output efficiency of the system. The traditional impedance matching network consists of a high-cost and large-volume adjustable capacitor, needs manual switching 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, which causes the problems of poor matching precision and high matching difficulty of the traditional fixed impedance matching system. Therefore, the research on the broadband self-adaptive impedance matching circuit has important practical significance for the electroacoustic transducer system.
The "impedance matching device" (publication No. 107636959B, published: 12/18/2018) can match the impedance of the high-frequency supply side with the impedance of the load side. However, this requires a variable reactor, which has the disadvantages of large size, high cost, and the inability to be continuously dynamically adjustable. The impedance matching method and the impedance matching system (publication number: 105594122B, publication number: 03/08/2019) and the impedance matching circuit (publication number: 108075736A, publication number: 2018, 05/25/2018) are both applied to the field of radio frequency transmission, and the driving frequency is changed to be matched with a power source so as to transmit radio frequency. However, the influence of the reactive load on the efficiency and the accuracy of the system is not considered.
"a transformer type adjustable reactor and a static reactive compensator formed by the same" (patent No. ZL200410060664.3, granted publication date: 8/29 of 2007) discloses a method for providing reactive power by forming a transformer, a thyristor, a reactor and a capacitor into a static reactive compensator. According to the invention, the transformer is connected with the load in parallel, and reactive power with the same amplitude and opposite polarity as the load is provided for the power supply, so that the power of the load is ensured to be unchanged, and the output power of the power supply is reduced. The disadvantages of this are: the transformer has the advantages of large structure volume, complex structure, suitability for high power, hierarchical adjustment and working only under the condition that the power output frequency is power frequency.
Disclosure of Invention
The invention aims to solve the technical problem that the prior art is not enough, 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 impedance network matching of dynamic self-adaption and wide frequency band, thereby improving the operating efficiency of the electroacoustic transduction system.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: an electro-acoustic transduction system includes 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 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.
Adapted by the inventionThere is a range of load impedance values that is selected to ensure that the matching network matches all possible load conditionsPF、CPFThe value of (c) is determined. Therefore, the present invention needs to perform L according to the range of load impedance to be matchedPF、CPFAnd designing the value in advance. The capacitance value C of the capacitorPFSatisfies the following conditions:
inductance value L of the inductorPFSatisfies the following conditions:
f is the voltage v across the impedance matching circuitCPFThe frequency of (d); vLRepresenting the voltage v across the loadLA valid value of (a); qL(Max)Is the maximum value of the reactive power of the load, QL(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 in inverse parallel connection are connected with the inductor in series to form a series branch circuit; the series branch is connected with the capacitor in parallel. The reactive power required by the load can be obtained by sampling and calculating the voltage and current sensors of the load, then the equivalent impedance value required by the impedance matching circuit is obtained by calculation, and finally the trigger angle value required by the thyristor is obtained by calculation. The phase angle and frequency of the voltage at the two ends of the impedance matching circuit can be obtained through a wide-band phase-locked loop (PLL), the phase angle at the two ends of the impedance matching circuit is compared with the thyristor trigger angle obtained through calculation in real time, the trigger signal of the thyristor can be obtained, and the effect of impedance matching is achieved through continuous triggering and turn-off of the thyristor. The whole impedance matching circuit can be regarded as a variable impedance circuit which can adjust the equivalent impedance according to the load and the output change of the amplifier.
The power amplifier control process includes:
1) calculating the output voltage v of a power amplifierCAnd a reference voltage value vC *Through a proportional-integral-derivative controller to calculate a current reference value is *；
2) Calculate is *And the output current i of the power amplifiersThe error is processed by 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 the 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 according to a reference signal waveform. Compared with the traditional power amplifier, the power amplifier has the advantages that the power amplitude of the output signal of the amplifier received by the load can be continuously and accurately amplified according to the requirement.
The invention also provides an impedance matching control method of the electroacoustic transducer system, which comprises the following steps:
1) calculating the voltage v across the impedance matching circuitCPFThe phase angle θ and the frequency f;
2) calculating the instantaneous reactive power of the load by using the phase angle theta and the frequency f;
3) calculating matched impedance based on the instantaneous reactive power of the load to obtain a trigger angle alpha of a thyristor in the impedance matching circuit;
4) comparing the voltage v across the impedance matching circuitCPFObtaining a trigger signal of the thyristor by the phase angle theta and the trigger angle alpha of the thyristor;
5) and continuously triggering the thyristor by a trigger signal to obtain the impedance value matched with the load.
The two thyristors in inverse parallel connection can control the equivalent magnitude of the current flowing through the thyristors by controlling the turn-on time length, so that the two thyristors are connected with the matching inductor in series to be equivalent to an adjustable inductor, and then the two thyristors are connected with the matching capacitor in parallel to be equivalent to an adjustable capacitor. The load in the electroacoustic transducer system is generally an inductive load, and the impedance matching network can be equivalent to a controllable and adjustable equivalent capacitive impedance. The load inductance impedance value is equal to and compatible with the load inductance impedance value under various load changes according to the following control method. Namely, the matching process is completed, and finally, the energy transfer efficiency of the power amplifier is improved.
In the step 1), the broadband phase-locked loop has the advantage that the voltage v at two ends of the impedance matching circuit can be calculated under different output frequencies of the amplifierCPFThe phase angle theta and the frequency f.
In step 2), the process of calculating the instantaneous reactive power of the load includes: will measure the voltage v across the loadLCurrent iLDelaying for 1/(4f) duration to obtain vL DAnd iL DThe instantaneous reactive power of the load end is calculated by the formula (1), wherein pLFor instantaneous active power, qLIs instantaneous reactive power. Based on the instantaneous calculation formula, the control system can calculate the result instantaneously and perform real-time control in the following steps.
In the step 3), the equivalent impedance X required by the impedance matching circuit is calculated by the formula (2)SVCThe equivalent impedance XSVCI.e. matching impedance. Based on the proposed impedance matching network, the matching impedance value required to be generated can be adjusted according to different load impedance conditions in real time. VCPFAnd VLRespectively representing the voltages v across the impedance matching circuitCPFEffective value and voltage v across the loadLA valid value of (a); qSVCAnd QLRespectively representing the capacitive reactive power of the impedance matching circuit and the inductive reactive power of the load.
In step 3), the impedance fast lookup tables under different trigger angles are pre-established according to the formula (3), the impedance fast lookup tables are used when the load changes, and the matching impedance X is usedSVCAnd acquiring the trigger angle alpha of the thyristor. Based on the quick lookup table, the requirement of the industrial application on the calculation amount can be reduced, so that different conditions can be quickly carried outAnd calculating the trigger angle of the lower matching impedance.
XCPF、XLPFRespectively a capacitor C in an impedance matching circuitPFInductor LPFThe equivalent impedance of (2).
The specific implementation process of the step 4) comprises the following steps: comparing the voltage v across the impedance matching circuitCPFAnd the firing angle alpha of the thyristor, when theta>At alpha, outputting a trigger signal T of a thyristor in the impedance matching circuit1(ii) a Calculating the value of 180-alpha, comparing theta with 180-alpha when theta is equal to>180-alpha, and outputting a trigger signal T of another thyristor in the impedance matching circuit2. Two thyristors which are reversely connected in parallel are continuously conducted in a continuous control period through control, and the effect of continuously matching load impedance is achieved.
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 firing angle α is 0 °, the two thyristors of the impedance matching circuit are sequentially turned on; when the firing angle α is 90 °, the 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 constant, and can also adjust the impedance value to adapt to the impedance change according to the impedance change of the load network. The continuous conduction in the invention means that two thyristors in the impedance matching circuit are conducted in turn. When the firing angle α is 90 °, the two thyristors of the impedance matching circuit are kept non-conductive at all times.
Compared with the prior art, the invention has the beneficial effects that:
1) the load matching circuit is matched with the load, so that the whole system becomes pure resistance, 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 impedance matching device has simple structure and does not need a large amount of conventional large-volume equipment such as transformers, reactors and the like. The impedance matching method can realize continuous impedance matching of broadband, high precision and self-adaptation under the conditions of different voltage output frequencies and amplitudes of the power amplifier and different load impedances, solves the problems of limited power transmission and low power factor caused by inconsistent impedance of the digital power amplifier and the electroacoustic transducer, realizes impedance network matching of dynamic self-adaptation and broadband, and can improve the operating efficiency of the ultrasonic transduction system.
Drawings
Fig. 1 is a schematic diagram of a wide-band impedance matching circuit and its layout position provided by the present invention;
FIG. 2 is a control block diagram of the present invention;
FIG. 3 is a graph comparing transient voltage and current at the load side and the amplifier side before and after changing the output voltage frequency of the amplifier by using the present invention for load matching in a simulation example;
FIG. 4 is a graph comparing transient voltage and current at the load side and the amplifier side before and after changing the amplitude of the output voltage of the amplifier by 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 electronic device Ta，
Tb，
(MOSFET or IGBT) providing a direct voltage VdcDC capacitor CdcAn output inductor L and an output capacitor C, 4 full-control devices form an H-bridge active inverter, and the direct current side of the active inverter is connected with a direct current capacitor CdcTwo ends, the output side of the active inverter is sequentially connected with an output inductor L and an output capacitor C in series, and the load is connected to the two ends of the C in parallel to obtain the output v of the power amplifierC(ii) a The impedance matching circuit comprises 2 thyristors T connected in inverse parallel1And T2Inductor LPFCapacitor CPFThyristor and inductor L connected in inverse parallelPFSeries circuit composed of series circuit and capacitor CPFIn parallel connection, thyristors are alternately switched on, and the switching-on and switching-off duration is changed by changing the trigger angle alpha, so that the input capacitance value is changed, and broadband self-adaptive impedance matching is carried out.
Referring to fig. 2, the digital power amplifier control process includes the steps of:
step 1: calculating the output voltage vCAnd a reference voltage value vC *Is calculated by a proportional-integral-derivative controller (PID) to obtain a reference value i of the currents *；
Step 2: then i is puts *And an output current isComparing errors, and calculating a reference value of current required to be output at the moment through PID;
and step 3: and finally, outputting a pulse trigger signal to a power electronic device (MOSFET or IGBT) through Pulse Width Modulation (PWM).
The invention uses a wide frequency band PLL to determine the voltage v across the impedance matching circuit in real timeCPFThe phase angle theta and the frequency f. According to the voltage v at two ends of the loadLAnd current iLAnd (4) 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 reactive power sum 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 look-up table (LUT). By continuously comparing the phase angle theta at the two ends of the impedance matching circuit with the thyristor trigger angle alpha obtained by the calculation, the trigger signal of the thyristor can be obtained in real time. And finally, the impedance matching circuit can generate an equivalent impedance value required 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. ofCPFCalculating the instantaneous voltage phase angle theta and the frequency f of the phase-locked loop (PLL) in real time through the PLL;
step 2: will measure the voltage v across the loadLCurrent iLDelay by 1/(4f) duration to obtain vL DAnd iL DObtaining the instantaneous power of the load end by performing the calculation of the formula (1), wherein pLFor instantaneous active power, qLIs instantaneous reactive power; calculating by the formula (2) to obtain the equivalent impedance X required by the load matching circuit (1)SVC(ii) a And step 3: by adjusting different firing angles alpha (0-90 DEG), the equivalent impedance value of the impedance matching circuit (1) can be changed, and the equivalent impedance value under different firing angles is determined by an equation (3), wherein XCPF、XLPFAre respectively a capacitor CPFInductor LPFThe equivalent impedance of (2); meanwhile, an impedance fast 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 changesSVCTo quickly find the triggering angle alpha;
and 4, step 4: comparing theta and alpha when theta>Alpha is the trigger signal T of one of the thyristors1. In addition, a value of 180-alpha is calculated, and theta is compared with 180-alpha when theta is equal to theta>180-alpha, namely outputs the trigger signal T of another thyristor2. 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 is required to be ensured to be capable of matching all possible load conditions, and the L selected in the rangePF、CPFThe value of (c) is determined. Therefore, the present invention needs to perform L according to the range of load impedance to be matchedPF、CPFAnd designing the value in advance. The impedance matching circuit and the design method thereof provided by the invention are as follows: based on all possible load conditions, including 1) load change conditions; 2) under the condition that the amplifier outputs different frequencies, the inductive reactive power which is most possible to reach is designed into a parallel capacitor, and the inductive reactive power which is least possible to reach is designed into a 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, when the trigger angle alpha is 0 degrees, the thyristor of the impedance matching circuit is continuously conducted, and the impedance matching circuit is equivalent to a capacitor CPFAnd an inductance LPFIn parallel, it providesMinimum capacitive reactive power QSVC(Min) At this time QSVC(Min)≥-QL(Min) Wherein Q isL(Min) Minimum inductive reactive power of the load;
when the trigger angle α is 90 °, the thyristor of the impedance matching circuit is completely turned off, which corresponds to the capacitor CPFIn series with the load network, which provides maximum capacitive reactive power QSVC(Max) (maximum inductive reactive power Q for load)L(Max) At this time Q)SVC(Max)≤-QL(Max). Capacitor CPFInductor LPFThe value of (b) can be determined by the following equations (4) and (5).
Referring to fig. 3 and 4, there are several working conditions in a simulation example of the present invention:
the simulation example is used for verifying that the self-adaptive broadband impedance matching circuit based on the controllable thyristor can effectively operate on broadband matching impedance in an amplifier system under different output frequencies and amplitudes. Therefore, 2 different dynamic working processes are shown in the simulation, namely: 1) after the impedance matching circuit is switched on 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 switched on to work, the effective value of the output voltage of the amplifier is increased from 220V to 300V, and the reference figure 4 shows that the effective value of the output voltage of the amplifier is increased.
The impedance matching circuit is connected between a power amplifier and a load thereof in series, the power amplifier can change the amplitude and the frequency of an output voltage (demonstrated by dynamic voltage amplitude and frequency change in simulation), the impedance matching circuit can change a system from an inductive state to a pure resistive state (demonstrated by using relative phases of voltage and current and power factors in simulation), the structural schematic diagram of the system is shown in figure 1, the control method part is shown in figure 2, and the simulation effect demonstration is shown in figures 3 and 4.
Power amplifier system parameters:
DC voltage Vdc500V, output voltage range: vL220V-300V, output frequency range: f is 300 Hz-500 Hz.
Impedance matching network system parameters:
a parallel capacitor: c PF10 μ F, series inductor: l isPF＝10mH。
Load part parameters:
equivalent inductance value: l ═ 30mH, equivalent resistance value: r is 10 Ω.
The following cases are results in simulations using the present invention.
Referring to fig. 3, in the range of 0ms to 4ms, the power amplifier outputs a voltage with a frequency of 300Hz to the load network, but the load side has a large amount of inductive reactive power, the load current lags behind the voltage, and the power factor is 0.27, which greatly reduces the power output efficiency of the amplifier. However, on the amplifier side using the load matching circuit, the voltage and the current are adjusted to the same phase, the power factor is increased to 0.99, and the output efficiency of the amplifier is improved. The output frequency of the amplifier is raised to 500Hz at the moment of 4ms, and the current and the voltage on the amplifier side can still be kept in the same phase and the power factor of 0.99 through a short transient process (6ms) by the self-adaptive impedance matching circuit. 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 for this simulation example are summarized in table 1.
TABLE 1 simulation summary of impedance matching circuit working at different voltage and frequency output states of amplifier
| 0～4ms | 4ms～14ms | |
| System change | - | Power amplifier varying output frequency |
| Frequency output of amplifier | 300Hz | 500Hz |
| Load side reactive | 22kVar | 28kVar |
| Amplifier side reactive | 2kVar | -2kVar |
| Load side power factor | 0.27 | 0.23 |
| Power supply side current power factor | 0.99 | 0.99 |
Referring to fig. 3, in 0ms to 4ms, the power amplifier outputs a voltage with an effective value of 220V to the load network, but the load side has a large amount of inductive reactive power, the load current lags behind the voltage, the power factor is 0.27, and the power output efficiency of the amplifier is greatly reduced. However, on the amplifier side using the load matching circuit, the voltage and the current are adjusted to the same phase, the power factor is increased to 0.99, and the output efficiency of the amplifier is improved. The effective voltage value of the amplifier output rises to 300V at the moment of 4ms, and the adaptive impedance matching circuit can still keep the current and the voltage on the amplifier side in the same phase and a power factor of 0.99 after a short 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 of this simulation example are summarized in table 2.
TABLE 2 simulation summary of impedance matching circuit operating at different voltage amplitudes output by amplifier
| 0～4ms | 4ms～14ms | |
| System change | - | Power amplifier varying output voltage amplitude |
| Amplifier voltage output | 220V | 300V |
| Load side reactive | 22kVar | 40kVar |
| Amplifier side reactive | 2kVar | -1kVar |
| Load side power factor | 0.27 | 0.27 |
| Power supply side current power factor | 0.99 | 0.99 |
The simulation results prove that the impedance matching circuit can adaptively match the load impedance in a wide frequency band so as to improve the power factor and finally improve the operating efficiency of the amplifier system.
Claims (10)
1. An electro-acoustic 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.
2. The electro-acoustic transduction system of claim 1, wherein the impedance matching circuit includes two thyristors connected in anti-parallel; the two thyristors in inverse parallel connection are connected with the inductor in series to form a series branch circuit; the series branch is connected with the capacitor in parallel; preferably, the capacitance value C of the capacitorPFSatisfies the following conditions:
preferably, the inductance value LPFSatisfies the following conditions:
f is the voltage v across the impedance matching circuitCPFThe frequency of (d); vLRepresenting the voltage v across the loadLA valid value of (a); qL(Max)Is the maximum value of the reactive power of the load, QL(Min)Is the minimum value of the reactive power of the load.
3. The electro-acoustic transduction system of claim 1, wherein the power amplifier control process comprises:
1) calculating the output voltage v of a power amplifierCAnd a reference voltage value vC *Through a proportional-integral-derivative controller to calculate a current reference value is *；
2) Calculate is *And the output current i of the power amplifiersThe error is processed by 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 the reference value of the current required to be output by the power amplifier through PWM, and outputting a pulse trigger signal.
4. An impedance matching control method for an electroacoustic transducer system as claimed in any one of claims 1 to 4, comprising the steps of:
1) calculating the voltage v across the impedance matching circuitCPFThe phase angle θ and the frequency f;
2) calculating the instantaneous reactive power of the load by using the phase angle theta and the frequency f;
3) calculating matched impedance based on the instantaneous reactive power of the load to obtain a trigger angle alpha of a thyristor in the impedance matching circuit;
4) comparing the voltage v across the impedance matching circuitCPFObtaining a trigger signal of the thyristor by the phase angle theta and the trigger angle alpha of the thyristor;
5) and continuously triggering the thyristor through a trigger signal to obtain an impedance value required to be matched by the load.
5. The method according to claim 5, wherein in step 1), the voltage v across the impedance matching circuit is calculated by a wideband phase-locked loopCPFThe phase angle theta and the frequency f.
6. The method of claim 5, wherein in step 2), the load is instantaneously reactiveThe calculation process of the power comprises the following steps: will measure the voltage v across the loadLCurrent iLDelaying for 1/(4f) duration to obtain vL DAnd iL DBy the formula
Calculating to obtain the instantaneous reactive power of the load end, wherein pLFor instantaneous active power, qLIs instantaneous reactive power.
7. The method of claim 5, wherein in step 3), the method is represented by the formula
Calculating to obtain the equivalent impedance X required by the impedance matching circuitSVCThe equivalent impedance XSVCI.e. matching impedance; vCPFAnd VLRespectively representing the voltages v across the impedance matching circuitCPFEffective value and voltage v across the loadLA valid value of (a); qSVCAnd QLRespectively representing the capacitive reactive power of the impedance matching circuit and the inductive reactive power of the load.
8. The method of claim 5, wherein in step 3), the method is based on a formula
Pre-establishing an impedance fast lookup table under different trigger angles, using the impedance fast lookup table when the load changes, and matching the impedance XSVCAcquiring a trigger angle alpha of the thyristor; xCPF、XLPFRespectively a capacitor C in an impedance matching circuitPFInductor LPFThe equivalent impedance of (2).
9. The method according to claim 5, wherein the specific implementation procedure of step 4) includes: comparing the voltage v across the impedance matching circuitCPFAnd the firing angle alpha of the thyristor whenθ>At alpha, outputting a trigger signal T of a thyristor in the impedance matching circuit1(ii) a Calculating the value of 180-alpha, comparing theta with 180-alpha when theta is equal to>180-alpha, and outputting a trigger signal T of another thyristor in the impedance matching circuit2。
10. The method according to claims 5 to 9, wherein 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 firing angle α is 0 °, the two thyristors of the impedance matching circuit are sequentially turned on; when the firing angle α is 90 °, the two thyristors of the impedance matching circuit are turned off.
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Cited By (4)
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| CN113037230A (en) * | 2021-03-22 | 2021-06-25 | 湖南大学 | Impedance matching control method and system for electroacoustic transducer system |
| CN113114055A (en) * | 2021-03-05 | 2021-07-13 | 中国科学院声学研究所 | Self-adaptive AC-DC conversion device and method for wireless transmission of sound carrier |
| CN113612469A (en) * | 2021-07-27 | 2021-11-05 | 许继集团有限公司 | Impedance matching device of electronic switch controllable self-recovery circuit |
| CN114978919A (en) * | 2022-06-14 | 2022-08-30 | 湖南大学 | Transducer bandwidth widening method and device using switch type non-Foster system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113114055A (en) * | 2021-03-05 | 2021-07-13 | 中国科学院声学研究所 | Self-adaptive AC-DC conversion device and method for wireless transmission of sound carrier |
| CN113037230A (en) * | 2021-03-22 | 2021-06-25 | 湖南大学 | Impedance matching control method and system for electroacoustic transducer system |
| CN113037230B (en) * | 2021-03-22 | 2022-06-24 | 湖南大学 | Impedance matching control method and system for electroacoustic transducer system |
| CN113612469A (en) * | 2021-07-27 | 2021-11-05 | 许继集团有限公司 | Impedance matching device of electronic switch controllable self-recovery circuit |
| 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 |
| CN114978919A (en) * | 2022-06-14 | 2022-08-30 | 湖南大学 | Transducer bandwidth widening method and device using switch type non-Foster system |
| 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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