A novel power amplifier suitable for electro-acoustic transducers

Abstract

A new power amplifier suitable for electro-acoustic transducer, including power loop and control system, power loop includes rectifier circuit, voltage stabilizing circuit and active output inverter circuit, rectifier circuit is connected with voltage stabilizing circuit, power loop also includes reactive compensation inverter circuit, voltage stabilizing circuit is connected with active output inverter circuit and reactive compensation inverter circuit respectively;Active output inverter circuit includes first inverter circuit, first filter circuit, first inverter circuit is connected with first filter circuit, rectifier circuit is connected with first inverter circuit;Reactive compensation inverter circuit includes second inverter circuit and second filter circuit, second inverter circuit is connected with second filter circuit, rectifier circuit is connected with second inverter circuit.The present application has good tracking performance, can track system change in real time, keep the stability of electro-acoustic transducer output signal, the voltage and current of electro-acoustic transducer load both ends basically keep in phase, so that the active output of electro-acoustic transducer reaches maximum.

Description

Technical Field

[0001] This invention relates to power amplifiers, and more specifically to a novel power amplifier suitable for electroacoustic transducers. Background Technology

[0002] Due to the significant advantage of sound waves propagating in water compared to other signals, electroacoustic transducers are widely used as underwater communication devices in fields such as fisheries, seabed surveying, and the military. However, as resistive-inductive loads, electroacoustic transducers typically generate a large amount of reactive power in practical applications, reducing the system's active power output capability.

[0003] To address this issue, numerous studies have proposed various solutions, primarily focusing on impedance matching. Existing research on electroacoustic transducer impedance matching methods mainly involves adding an impedance matching network between the power amplifier and the electroacoustic transducer to improve the transducer's output efficiency within its operating frequency band. Examples include static impedance matching, dynamic impedance matching, and active impedance matching. Static matching involves adding a capacitor to the system to create resonance with the equivalent inductance of the electroacoustic transducer at a specific frequency, thereby increasing the output power near that frequency. Dynamic matching is similar in principle to static matching, further increasing the matching bandwidth by switching capacitors to change the resonant point. Active matching utilizes reactive power compensation, using an inverter circuit to compensate for the reactive power of the electroacoustic transducer load, resulting in zero reactive power output. While impedance matching methods can improve the output capability of electroacoustic transducers to some extent, their matching networks are often overly complex, making the entire electroacoustic transducer application system very large and the control process very complex and inconvenient to operate.

[0004] In electroacoustic transducer applications, the power amplifier's role is to generate a sinusoidal voltage of a specified frequency and amplitude to provide energy to the transducer. As the excitation source for electroacoustic transducers in underwater communication applications, the power amplifier provides electrical output and is an indispensable component of the system. Compared to studying impedance matching networks to improve the transducer's active power output capability, designing electroacoustic transducers with active and reactive power regulation functions has greater practical application value. It not only allows the underwater communication system to maintain its original connection topology but also maximizes the transducer's active power output. However, existing power amplifiers are all based on a single-inverter structure and cannot simultaneously regulate active and reactive power. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the above-mentioned background technology and provide a new type of power amplifier suitable for electroacoustic transducers, which has good tracking performance, can track system changes in real time, maintain the stability of the output signal of the electroacoustic transducer, and keep the voltage at both ends of the load of the electroacoustic transducer basically in phase with the current flowing through it, so that the active power output of the electroacoustic transducer reaches the maximum.

[0006] The technical solution adopted by this invention to solve its technical problem is a novel power amplifier suitable for electroacoustic transducers, comprising a power circuit and a control system. The power circuit includes a rectifier circuit, a voltage regulator circuit, and an active power output inverter circuit. The rectifier circuit is connected to the voltage regulator circuit. The power circuit also includes a reactive power compensation inverter circuit. The voltage regulator circuit is connected to both the active power output inverter circuit and the reactive power compensation inverter circuit. The active power output inverter circuit includes a first inverter circuit and a first filter circuit. The first inverter circuit is connected to the first filter circuit, and the rectifier circuit is connected to the first inverter circuit. The reactive power compensation inverter circuit includes a second inverter circuit and a second filter circuit. The second inverter circuit is connected to the second filter circuit, and the rectifier circuit is connected to the second inverter circuit.

[0007] Furthermore, the voltage regulator circuit includes a DC-side capacitor C. dc The alternating current generated by the AC power source is rectified and then rectified by the DC side capacitor C. dc The inverter circuit is connected in parallel. The first inverter circuit includes four power devices at the top, which together form the upper single-phase full-bridge inverter circuit. The second inverter circuit includes four power devices at the bottom, which together form the lower single-phase full-bridge inverter circuit. The first filter circuit includes a first filter inductor L. a and the first filter capacitor C a The second filter circuit includes a second filter inductor L. b Second filter capacitor C b The common connection point A of the upper single-phase full-bridge inverter circuit is connected to the first filter inductor L. a One end is connected to the common connection point B of the upper single-phase full-bridge inverter circuit and the first filter capacitor C. a One end is connected to the first filter capacitor C. a The other end is connected to the first filter inductor L a The other end is connected; the common connection point C of the lower single-phase full-bridge inverter circuit is connected to the second filter inductor L. b One end is connected to the common connection point D of the lower single-phase full-bridge inverter circuit and the second filter capacitor C. b One end is connected to the second filter capacitor C. b The other end is connected to the second filter inductor L b The other end is connected to; the second filter capacitor C b The other end is connected to the first filter inductor L aThe other end is connected in series with one output line of the power amplifier, the first filter inductor L a One end serves as one output point of the power amplifier, and the common connection point B serves as the other output point of the power amplifier.

[0008] Furthermore, the power device is a MOSFET or an IGBT.

[0009] Furthermore, the control system includes an inverter drive circuit, a digital control system, and a feedback signal output circuit. The feedback signal output circuit is connected to the digital control system, the digital control system is connected to the inverter drive circuit, the inverter drive circuit is connected to the active power output inverter circuit and the reactive power compensation inverter circuit, and the active power output inverter circuit and the reactive power compensation inverter circuit are connected to the feedback signal output circuit.

[0010] Furthermore, the feedback signal output circuit includes a first feedback signal output circuit and a second feedback signal output circuit. The first feedback signal output circuit includes a first voltage detection module, and the second feedback signal output circuit includes a second voltage detection module and a current detection module. The digital control system includes an active power output inverter circuit control system and a reactive power compensation inverter circuit control system. The active power output inverter circuit control system includes a first error calculation module, a PI controller, a first PWM modulation module, and a first feedforward controller. The reactive power compensation inverter circuit control system includes a second error calculation module, a reference voltage calculation module, a PR controller, a second PWM modulation module, and a second feedforward controller. The inverter drive circuit includes an active power inverter drive circuit and a reactive power inverter drive circuit. The active power inverter drive circuit includes a first optocoupler isolation circuit and a first drive circuit. The reactive power inverter drive circuit includes a second optocoupler isolation circuit and a second drive circuit.

[0011] The first voltage detection module is connected to the first error calculation module. The first error calculation module is connected to the PI controller and the first feedforward controller respectively. The PI controller and the first feedforward controller are connected to the first PWM modulation module respectively. The first PWM modulation module is connected to the first optocoupler isolation circuit. The first optocoupler isolation circuit is connected to the first drive circuit. The first drive circuit is connected to the first inverter circuit.

[0012] The second voltage detection module is connected to the second error calculation module and the reference voltage calculation module, respectively. The current detection module is connected to the reference voltage calculation module. The second error calculation module is connected to the PR controller. The reference voltage calculation module is connected to the second feedforward controller. The second feedforward controller and the PR controller are connected to the second PWM modulation module, respectively. The second PWM modulation module is connected to the second optocoupler isolation circuit. The second optocoupler isolation circuit is connected to the second drive circuit. The second drive circuit is connected to the second inverter circuit.

[0013] Compared with the prior art, the advantages of the present invention are as follows:

[0014] This invention adds a reactive power compensation inverter circuit to the traditional power amplifier to effectively compensate for the reactive power of the electroacoustic transducer. The active power output inverter circuit provides the basic active power output to the electroacoustic transducer, while the reactive power compensation inverter circuit provides reactive power compensation. This novel power amplifier exhibits good tracking performance, capable of tracking system changes in real time and maintaining the stability of the electroacoustic transducer's output signal. The voltage across the load terminals of the electroacoustic transducer remains essentially in phase with the flowing current, maximizing the active power output of the electroacoustic transducer. Attached Figure Description

[0015] Figure 1 This is a structural block diagram of the power amplifier according to an embodiment of the present invention.

[0016] Figure 2 yes Figure 1 The power loop topology diagram of the embodiment shown.

[0017] Figure 3 yes Figure 1 The block diagram of the active power output inverter circuit control system of the embodiment shown is shown.

[0018] Figure 4 yes Figure 1 The block diagram of the reactive power compensation inverter circuit control system of the embodiment shown is shown.

[0019] Figure 5 yes Figure 1 The diagram shows the output voltage waveform of the active power output inverter circuit in the embodiment shown.

[0020] Figure 6 yes Figure 1 The diagram shows the output voltage waveform of the reactive power compensation inverter circuit in the embodiment shown.

[0021] Figure 7 Yes, yes Figure 1 The overall control system of the power amplifier in the embodiment shown.

[0022] Figure 8 yes Figure 1 The equivalent circuit of the electroacoustic transducer in the embodiment shown.

[0023] Figure 9 yes Figure 1 The two inverter circuits in the illustrated embodiment output voltage u after passing through a filter circuit. a u b The waveform.

[0024] Figure 10 yes Figure 1 The output voltage waveform of the power amplifier in the illustrated embodiment.

[0025] Figure 11 It is a waveform diagram of the voltage and current flowing through the two ends of an electroacoustic transducer using a conventional functional power amplifier.

[0026] Figure 12 Is adopted Figure 1 The waveforms of the voltage and current flowing through the electroacoustic transducer of the power amplifier in the illustrated embodiment are shown. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0028] Reference Figure 1 This embodiment includes a power circuit and a control system. The power circuit includes a rectifier circuit, a voltage regulator circuit, an active power output inverter circuit, and a reactive power compensation inverter circuit. The rectifier circuit is connected to the voltage regulator circuit, which is also connected to both the active power output inverter circuit and the reactive power compensation inverter circuit. The active power output inverter circuit includes a first inverter circuit and a first filter circuit, with the first inverter circuit and the first filter circuit connected to each other. The rectifier circuit is also connected to the first inverter circuit. The reactive power compensation inverter circuit includes a second inverter circuit and a second filter circuit, with the second inverter circuit and the second filter circuit connected to each other. The rectifier circuit is also connected to the second inverter circuit.

[0029] Reference Figure 2 The voltage regulator circuit includes a DC-side capacitor C. dc The alternating current generated by the AC power source is rectified and then rectified by the DC side capacitor C. dc The inverters are connected in parallel to provide voltage regulation for both the active power output inverter circuit and the reactive power compensation inverter circuit. The first inverter circuit includes four power devices at the top, forming an upper single-phase full-bridge inverter circuit. The second inverter circuit includes four power devices at the bottom, forming a lower single-phase full-bridge inverter circuit. The first filter circuit includes a first filter inductor L. a and the first filter capacitor C a The second filter circuit includes a second filter inductor L. b Second filter capacitor C b The common connection point A of the upper single-phase full-bridge inverter circuit is connected to the first filter inductor L. a One end is connected to the common connection point B of the upper single-phase full-bridge inverter circuit and the first filter capacitor C. a One end is connected to the first filter capacitor C. a The other end is connected to the first filter inductor L a The other end is connected; the common connection point C of the lower single-phase full-bridge inverter circuit is connected to the second filter inductor L. b One end is connected to the common connection point D of the lower single-phase full-bridge inverter circuit and the second filter capacitor C. bOne end is connected to the second filter capacitor C. b The other end is connected to the second filter inductor L b The other end is connected to; the second filter capacitor C b The other end is connected to the first filter inductor L a The other end is connected in series with one output line of the power amplifier, the first filter inductor L a One end serves as one output point of the power amplifier, and common connection point B serves as the other output point of the power amplifier. The electroacoustic transducer is connected to both output points of the power amplifier. In this embodiment, the power device is a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor). In specific applications, other power devices such as IGBTs (Insulated Gate Bipolar Transistors) can also be used.

[0030] Reference Figure 1 The control system includes an inverter drive circuit, a digital control system, and a feedback signal output circuit. The feedback signal output circuit is connected to the digital control system, the digital control system is connected to the inverter drive circuit, the inverter drive circuit is connected to the active power output inverter circuit and the reactive power compensation inverter circuit, and the active power output inverter circuit and the reactive power compensation inverter circuit are connected to the feedback signal output circuit.

[0031] Reference Figure 3 , Figure 4 The feedback signal output circuit includes a first feedback signal output circuit and a second feedback signal output circuit. The first feedback signal output circuit includes a first voltage detection module, and the second feedback signal output circuit includes a second voltage detection module and a current detection module. The digital control system includes an active power output inverter circuit control system and a reactive power compensation inverter circuit control system. The active power output inverter circuit control system includes a first error calculation module, a PI controller, a first PWM modulation module, and a first feedforward controller. The reactive power compensation inverter circuit control system includes a second error calculation module, a reference voltage calculation module, a PR controller, a second PWM modulation module, and a second feedforward controller. The inverter drive circuit includes an active power inverter drive circuit and a reactive power inverter drive circuit. The active power inverter drive circuit includes a first optocoupler isolation circuit and a first drive circuit. The reactive power inverter drive circuit includes a second optocoupler isolation circuit and a second drive circuit.

[0032] The first voltage detection module is connected to the first error calculation module. The first error calculation module is connected to the PI controller and the first feedforward controller. The PI controller and the first feedforward controller are connected to the first PWM modulation module. The first PWM modulation module is connected to the first optocoupler isolation circuit. The first optocoupler isolation circuit is connected to the first drive circuit. The first drive circuit is connected to the first inverter circuit.

[0033] The second voltage detection module is connected to the second error calculation module and the reference voltage calculation module, respectively. The current detection module is connected to the reference voltage calculation module. The second error calculation module is connected to the PR controller. The reference voltage calculation module is connected to the second feedforward controller. The second feedforward controller and the PR controller are connected to the second PWM modulation module, respectively. The second PWM modulation module is connected to the second optocoupler isolation circuit. The second optocoupler isolation circuit is connected to the second drive circuit. The second drive circuit is connected to the second inverter circuit.

[0034] Reference Figure 5 The active power output inverter circuit is responsible for providing active power to the electroacoustic transducer, which is a standard sine wave signal. (Refer to...) Figure 6 The reactive power compensation inverter circuit provides reactive power compensation for the electroacoustic transducer. Therefore, it starts tracking the output power at the load end at time zero to ensure that the reactive power is eliminated.

[0035] Reference Figure 3 The active power output inverter circuit control system is used to control the active power output inverter circuit. The active power output inverter circuit control system acquires the voltage of the first filter capacitor C through the first voltage detection module. a Voltage u at both ends a Compare it with the power amplifier's set voltage u at that moment. ref_1 The error signal u is obtained by inputting it into the first error calculation module. ess1 =u ref_1 -u a The error signal is then processed by a PI controller and sent to the first PWM modulation module. To improve the system response speed, the set voltage u is... ref_1 After being processed by the first feedforward controller, the signal is sent to the first PWM modulation module, where it and the PI controller output signal jointly generate the first PWM signal. To avoid signal interference, the first PWM signal passes through the first optocoupler isolation circuit and is then input to the first drive circuit, thereby driving the active power output inverter circuit to operate.

[0036] The transfer function of the PI controller is:

[0037] G PI (s)=k p1 +k i / s (1)

[0038] In the formula, k p1 k is the proportional coefficient of the PI controller. i is the integral coefficient.

[0039] Reference Figure 4 The reactive power compensation inverter circuit control system is used to control the reactive power compensation inverter circuit. The difference between this system and the active power output inverter circuit control system is that, in addition to collecting data from the second filter capacitor C, the reactive power compensation inverter circuit control system...b Voltage u at both ends b In addition, it is also necessary to collect the load current i l Specifically, the second voltage detection module acquires the data from the second filter capacitor C. b Voltage u at both ends b The current detection module collects the load current i l The two signals are processed by the second reference voltage calculation module to obtain the reference voltage u. ref_2 Reference voltage u ref_2 After being processed by the second feedforward controller, the signal is sent to the second PWM modulation module, where it is combined with the output signal of the PR controller to generate the second PWM signal.

[0040] To ensure the system's frequency tracking performance, a PR controller is used to set the power amplifier's operating frequency f at that moment. s Introduced into the PR controller as a reference.

[0041] The error signal is:

[0042] u ess2 =u ref_2 -u b (2)

[0043] The reference voltage is:

[0044]

[0045]

[0046]

[0047]

[0048] The transfer function of the PR controller is:

[0049]

[0050] Among them, u ess2 For the error signal, u α (t) is u l The α-phase component after α-β transformation, u β (t) is u l The β-phase component after α-β transformation, i α (t) is i l The α-phase component after α-β transformation, i β (t) is i l The β-phase component after α-β transformation, i l For the load current, u l For the load voltage u l =u a -um T is the time period, T = 1 / (2πf) s p(t) and q(t) are the instantaneous active and reactive power of the load, respectively, and k P2 k is the proportional coefficient of the PR controller. r ω is the resonance coefficient, and ω0 is the resonant angular frequency.

[0051] Figure 7 For the overall control system of the power amplifier, since the function of the active power output inverter circuit is to provide active power to the electroacoustic transducer, it only needs to ensure the stability of the output voltage, so a PI controller is used for control. The function of the reactive power compensation inverter circuit is to compensate for the reactive power of the electroacoustic transducer. It needs to adjust the output current in real time according to the state of the load. To ensure its fast tracking performance, a PR controller is used for control.

[0052] To verify the effectiveness of the novel power amplifier designed for electroacoustic transducers in this invention, circuit simulation modeling was performed. The equivalent circuit of the electroacoustic transducer is shown below. Figure 8 As shown, L E R is the equivalent total inductance of the transducer. E L is the equivalent total resistance of the transducer. e R is the equivalent inductance of the electrical terminals. e R is the static resistance. m For dynamic resistance, L m For dynamic inductance, C m For dynamic capacitance, L ES This is a static inductor; relevant parameters are shown in Table 1.

[0053] Electrical terminal equivalent inductance L e The calculation formula is as follows:

[0054]

[0055] In the formula, ω is the angular frequency of the system during operation, ω = 2πf s .

[0056] Table 1. Values ​​of relevant parameters for the transducer

[0057]

[0058] Reference Figure 9 The first inverter circuit outputs voltage u after passing through the first filter circuit. a The waveform, the output voltage u of the second inverter circuit after passing through the second filter circuit. b The waveform shows that the operating frequency switches from 200Hz to 300Hz at 0.05s. The figure shows the output voltage u of the active power output inverter circuit. aIt can respond quickly to system changes, and the output voltage is a standard sine wave. It provides the output voltage u of the reactive power compensation inverter circuit. b Lagging behind u a From a certain angle, this indirectly indicates that the electroacoustic transducer is an inductive load and requires a certain amount of power. Figure 9 u b Only then can it be compensated. Furthermore, the novel reactive power compensation inverter circuit of the power amplifier proposed in this invention can reach a stable state in a short time when the operating frequency changes, achieving rapid tracking. After being filtered by their respective filter circuits, the first and second inverter circuits output the series-connected electrical signal as the excitation signal provided by the power amplifier to the electroacoustic transducer load, and its voltage waveform is as follows: Figure 10 As shown, its waveform is u a with u b The result of the subtraction shows that, starting from time zero, the output voltage of the power amplifier reaches a stable state after about one cycle. After the operating frequency switches from 100Hz to 200Hz, the power amplifier re-enters a stable state after 1 / 2 cycle. This indicates that the novel power amplifier proposed in this invention has good tracking performance, can track system changes in real time, and maintain the stability of the output signal of the electroacoustic transducer.

[0059] Furthermore, to verify that the novel power amplifier proposed in this invention can effectively achieve impedance matching, thereby optimizing the output efficiency of the electroacoustic transducer, the output voltage and current waveforms of the electroacoustic transducer using a conventional power amplifier and the novel power amplifier proposed in this invention were compared, as follows: Figure 11 and Figure 12 As shown in the diagram, when using a traditional power amplifier, the current of the electroacoustic transducer load leads the voltage. Besides converting the power amplifier's output power into a sound signal, a portion becomes reactive power, thus reducing the output capability of the electroacoustic transducer. The electroacoustic transducer using the novel power amplifier proposed in this invention can effectively solve this problem, as shown in the diagram. Figure 12 As shown, the voltage across the load terminals of the electroacoustic transducer remains essentially in phase with the current flowing through it, thus maximizing its output efficiency.

[0060] This invention adds a reactive power compensation inverter circuit to the traditional power amplifier to effectively compensate for the reactive power of the electroacoustic transducer. AC power is first rectified into DC power by a rectifier circuit to power the inverter circuit. The feedback signal output circuit collects the signals from the outputs of two filter circuits and transmits them to the digital control system for analysis and processing, obtaining the required PWM signals. The inverter drive circuit uses the PWM signals to control both the active power output inverter circuit and the reactive power compensation inverter circuit, converting the DC power into the required AC power. The active power output inverter circuit provides the basic active power output to the electroacoustic transducer, while the reactive power compensation inverter circuit provides reactive power compensation, maximizing the active power output of the electroacoustic transducer.

[0061] Those skilled in the art can make various modifications and variations to this invention. If such modifications and variations are within the scope of the claims of this invention and their equivalents, then such modifications and variations are also within the protection scope of this invention.

[0062] The contents not described in detail in the specification are prior art known to those skilled in the art.

Claims

1. A novel power amplifier suitable for electroacoustic transducers, comprising a power circuit and a control system, wherein the power circuit includes a rectifier circuit, a voltage regulator circuit, and an active power output inverter circuit, the rectifier circuit being connected to the voltage regulator circuit, characterized in that: The power circuit also includes a reactive power compensation inverter circuit, and the voltage regulator circuit is connected to the active power output inverter circuit and the reactive power compensation inverter circuit respectively; the active power output inverter circuit includes a first inverter circuit and a first filter circuit, the first inverter circuit is connected to the first filter circuit, and the rectifier circuit is connected to the first inverter circuit; the reactive power compensation inverter circuit includes a second inverter circuit and a second filter circuit, the second inverter circuit is connected to the second filter circuit, and the rectifier circuit is connected to the second inverter circuit. The control system includes an inverter drive circuit, a digital control system, and a feedback signal output circuit. The feedback signal output circuit is connected to the digital control system, the digital control system is connected to the inverter drive circuit, the inverter drive circuit is connected to the active power output inverter circuit and the reactive power compensation inverter circuit, and the active power output inverter circuit and the reactive power compensation inverter circuit are connected to the feedback signal output circuit. The feedback signal output circuit includes a first feedback signal output circuit and a second feedback signal output circuit. The first feedback signal output circuit includes a first voltage detection module, and the second feedback signal output circuit includes a second voltage detection module and a current detection module. The digital control system includes an active power output inverter circuit control system and a reactive power compensation inverter circuit control system. The active power output inverter circuit control system includes a first error calculation module, a PI controller, a first PWM modulation module, and a first feedforward controller. The reactive power compensation inverter circuit control system includes a second error calculation module, a reference voltage calculation module, a PR controller, a second PWM modulation module, and a second feedforward controller. The inverter drive circuit includes an active power inverter drive circuit and a reactive power inverter drive circuit. The active power inverter drive circuit includes a first optocoupler isolation circuit and a first drive circuit. The reactive power inverter drive circuit includes a second optocoupler isolation circuit and a second drive circuit. The first voltage detection module is connected to the first error calculation module. The first error calculation module is connected to the PI controller and the first feedforward controller respectively. The PI controller and the first feedforward controller are connected to the first PWM modulation module respectively. The first PWM modulation module is connected to the first optocoupler isolation circuit. The first optocoupler isolation circuit is connected to the first drive circuit. The first drive circuit is connected to the first inverter circuit. The second voltage detection module is connected to the second error calculation module and the reference voltage calculation module, respectively. The current detection module is connected to the reference voltage calculation module. The second error calculation module is connected to the PR controller. The reference voltage calculation module is connected to the second feedforward controller. The second feedforward controller and the PR controller are connected to the second PWM modulation module, respectively. The second PWM modulation module is connected to the second optocoupler isolation circuit. The second optocoupler isolation circuit is connected to the second drive circuit. The second drive circuit is connected to the second inverter circuit.

2. The novel power amplifier for electroacoustic transducers as described in claim 1, characterized in that: The voltage regulator circuit includes a DC-side capacitor. C dc The alternating current generated by the AC power source is rectified and then connected to the DC side capacitor. C dc The inverter circuit is connected in parallel. The first inverter circuit includes four power devices at the top, which together form the upper single-phase full-bridge inverter circuit. The second inverter circuit includes four power devices at the bottom, which together form the lower single-phase full-bridge inverter circuit. The first filter circuit includes a first filter inductor. L a and the first filter capacitor C a The second filter circuit includes a second filter inductor. L b Second filter capacitor C b The common connection point A of the upper single-phase full-bridge inverter circuit is connected to the first filter inductor. L a One end is connected to the common connection point B of the upper single-phase full-bridge inverter circuit and the first filter capacitor. C a One end is connected to the first filter capacitor. C a The other end is connected to the first filter inductor L a The other end is connected; the common connection point C of the lower single-phase full-bridge inverter circuit is connected to the second filter inductor. L b One end is connected to the common connection point D of the lower single-phase full-bridge inverter circuit and the second filter capacitor. C b One end is connected to the second filter capacitor. C b The other end is connected to the second filter inductor L b The other end is connected to the second filter capacitor. C b The other end is connected to the first filter inductor L a The other end is connected in series with one output line of the power amplifier, the first filter inductor. L a One end serves as one output point of the power amplifier, and the common connection point B serves as the other output point of the power amplifier.

3. The novel power amplifier for electroacoustic transducers as described in claim 2, characterized in that: The power device is a MOSFET or an IGBT.

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