A power amplifier regulation system, a PCB card and a sound equipment
By introducing voltage and current sampling components into the output signal of the power amplifier module, combined with signal control circuitry and data acquisition module, the output signal of the power amplifier module can be detected and adjusted in real time, solving the problem of sudden howling caused by the uncontrollable position of the microphone and speaker, and improving user experience and hardware efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGZHOU SHIYUAN ELECTRONICS CO LTD
- Filing Date
- 2025-05-13
- Publication Date
- 2026-06-12
AI Technical Summary
Existing technology suffers from slow response to sudden feedback when the microphone and speaker positions are uncontrollable, impacting user experience.
The output signal of the power amplifier module is sampled in real time using voltage and current sampling components. Combined with signal control circuitry and data acquisition module, the output signal of the power amplifier module is adjusted in real time through hardware feedback mechanism to reduce howling.
It enables a rapid response to sudden howling, reduces the impact of howling on user experience, and reduces hardware costs and power consumption.
Smart Images
Figure CN224356241U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of communication technology, specifically to a power amplifier control system, a PCB board, and an audio device. Background Technology
[0002] Feedback is a common problem in audio systems, especially those with microphones and speakers. Feedback essentially occurs when acoustic signals create positive feedback within a closed-loop system, causing specific frequencies to be amplified and resulting in a piercing whistling sound. To reduce feedback, techniques typically employ signal re-sampling and audio algorithm processing. Class D amplifiers are highly efficient digital power amplifiers commonly used to drive speakers. Specifically, the system re-samples data from the audio signal output by the Class D amplifier—that is, it acquires the actual sound information being played—and processes the signal using audio algorithms to suppress feedback. However, in practical use, the positions of microphones and speakers are uncontrollable, leading to sudden feedback in certain situations. Therefore, while the aforementioned techniques can suppress feedback, they may not be able to provide a real-time response when sudden feedback occurs. Utility Model Content
[0003] The embodiments of this application mainly address the technical problem of slow response to sudden howling in related technologies.
[0004] To solve the above-mentioned technical problems, one technical solution adopted in this application is: providing a power amplifier control system, the power amplifier control system including a main control module and a power amplifier module, the output terminal of the power amplifier module being connected to the main control module through a voltage sampling component and a current sampling component; the voltage sampling component is used to sample the sampling voltage of the output signal of the power amplifier module and transmit a first digital signal corresponding to the sampling voltage to the main control module; the current sampling component is used to sample the sampling current of the output signal of the power amplifier module and transmit a second digital signal corresponding to the sampling current to the main control module; the main control module responds to the first digital signal and the second digital signal, and adjusts the output signal of the power amplifier module according to the first digital signal and the second digital signal.
[0005] This solution incorporates voltage and current sampling components to sample the power amplifier module's output signal in real time through hardware constraints. This allows for the acquisition of the power amplifier's output energy status. Based on algorithm optimization, a secondary detection mechanism is added, utilizing feedback to suppress sudden energy spikes, thereby preventing feedback and reducing its impact on user experience. If abnormal power amplifier output energy is detected, it can be directly fed back to the main control module via the hardware structure. Compared to methods that suppress feedback using audio, this solution shortens the signal feedback path based on voltage or current sampling components, eliminating reliance on external chip detection mechanisms, such as microphone data acquisition chips. This enables the main control module to immediately acquire the power amplifier's output energy status when an abnormal output signal occurs, and adjust the power amplifier's energy output accordingly in real time, reducing the impact of abnormal microphone volume or sudden environmental noises on user experience.
[0006] In some embodiments, the voltage sampling component includes a first sampling line, a second sampling line, and a first analog-to-digital converter (ADC). The first output terminal of the power amplifier module is connected to the input terminal of the first ADC via the first sampling line, and the second output terminal of the power amplifier module is connected to the input terminal of the first ADC via the second sampling line. The output terminal of the first ADC is connected to the first feedback terminal of the main control module. The first and second output terminals are used to output mutually inverted signals to the speaker. The first ADC acquires the sampled voltage of the output signal through the first and second sampling lines, converts the sampled voltage into a corresponding first digital signal, and provides the first digital signal to the main control module. This solution utilizes a set of sampling lines to acquire the sampled voltage of the power amplifier module, then converts it into a first digital signal through the first ADC and directly provides it to the main control module. This allows the main control module to obtain the voltage status of the power amplifier module's output signal in real time through the first digital signal, thereby enabling it to respond quickly and adjust the power amplifier module's output signal promptly when the voltage of the output signal fluctuates abnormally.
[0007] In some embodiments, the current sampling component includes a third sampling line, a fourth sampling line, a sampling resistor, and a second analog-to-digital converter (ADC). The sampling resistor is connected in series with the first output terminal of the power amplifier module. The first end of the sampling resistor is connected to the first output terminal of the power amplifier module, and the second end of the sampling resistor is used to connect to a speaker. The first end of the sampling resistor is connected to the input terminal of the second ADC through the third sampling line, and the second end of the sampling resistor is connected to the input terminal of the second ADC through the fourth sampling line. The output terminal of the second ADC is connected to the second feedback terminal of the main control module. The second ADC obtains the sampling current of the output signal through the third sampling line, the fourth sampling line, and the sampling current, converts the sampling current into a second digital signal, and provides the second digital signal to the main control module. This solution utilizes a set of sampling lines combined with sampling resistors to obtain the sampling current of the power amplifier module's output signal. Then, it converts the current into a second digital signal through a second analog-to-digital converter and provides it directly to the main control module. This allows the main control module to obtain the current status of the power amplifier module's output signal in real time through the second digital signal, reducing the response time of the main control module. As a result, the main control module can respond quickly when there are abnormal fluctuations in the current of the output signal and adjust the output signal of the power amplifier module in a timely manner.
[0008] In some embodiments, the power amplifier control system further includes a signal control line, through which the main control module is connected to the power amplifier module. The main control module generates a control signal in response to the first digital signal and the second digital signal, and transmits the control signal to the control terminal of the power amplifier module via the signal control line, thereby adjusting the output signal of the power amplifier module. This solution uses a signal control line to achieve a feedback closed loop. This signal control line can be used solely for the main control module to transmit control signals to the power amplifier module. When the main control module detects an abnormality in the output signal of the power amplifier module, it immediately uses this line to directly output a control signal to the power amplifier module for adjustment, thereby improving the adjustment rate.
[0009] In some embodiments, the power amplifier control system further includes a data acquisition module; the data acquisition module is connected to the output of the power amplifier module via an audio feedback line, and is used to acquire the audio data output by the power amplifier module and transmit the audio data to the main control module. This solution sets the data acquisition module to form an audio feedback closed loop via the audio feedback line, and the acquired audio data can be used for adaptive filtering or noise cancellation algorithms, thereby improving the listening experience.
[0010] In some embodiments, the data acquisition module is further connected to a microphone via a microphone acquisition line to acquire microphone data from the microphone and transmit the microphone data to the main control module. The main control module is further configured to adjust the output signal of the power amplifier module based on the audio data and the microphone data. This solution configures the data acquisition module to simultaneously acquire the re-acquired audio data and microphone data and transmit them to the main control module. The main control module can then automatically adjust the gain, equalization, or phase of the power amplifier to compensate for environmental acoustic defects (such as low-frequency standing waves), thereby making the output audio more suitable for the current environment.
[0011] In some embodiments, the data acquisition module transmits the audio data and the microphone data to the main control module via a first bus. This solution uses the first bus to transmit audio data and microphone data in parallel, ensuring strict synchronization of the two data signals, reducing the latency difference of traditional multi-line transmission, and also reducing the pin occupancy of the chip in the main control module, thereby reducing PCB routing complexity and hardware costs.
[0012] In some embodiments, the main control module is connected to the input terminal of the power amplifier module via a second bus; the main control module is used to generate an inverse cancellation signal based on the audio data and the microphone data, and transmit the inverse cancellation signal to the power amplifier module via the second bus. This solution can transmit unconverted audio data to the main control module via the bus, avoiding the loss and interference of analog signal transmission and improving the fidelity of audio data during transmission.
[0013] To address the aforementioned technical problems, another technical solution adopted in this application is to provide a PCB board, including the power amplifier control system as described above, wherein the power amplifier control system is disposed on the PCB board in the form of a circuit. This PCB board has the same beneficial effects as the aforementioned power amplifier control system.
[0014] To address the aforementioned technical problems, another technical solution adopted in this application is to provide an audio device, including the power amplifier control system and a speaker as described above, wherein the output terminal of the power amplifier module in the power amplifier control system is connected to the control terminal of the speaker. This audio device has the same beneficial effects as the aforementioned power amplifier control system. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of a power amplifier control system provided in an embodiment of this application;
[0016] Figure 2 This is a schematic diagram of the structure of a power amplifier control system provided in another embodiment of this application;
[0017] Figure 3This is a schematic diagram of the structure of a power amplifier control system provided in another embodiment of this application. Detailed Implementation
[0018] To facilitate understanding of this application, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as "connected" to another element, it can be directly connected to the other element, or there may be one or more intervening elements. The terms "first," "second," "third," "fourth," etc., used in this specification are for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0019] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.
[0020] In normal use scenarios for audio equipment, if acoustic signals form positive feedback in a closed-loop system, causing signals at specific frequencies to be continuously amplified until they become uncontrollable, feedback will occur. This can easily affect the user experience and may even damage the audio equipment. Furthermore, as a highly efficient digital power amplifier, Class D amplifiers are typically used to drive loudspeakers. Based on this, related technologies usually utilize microphone data acquisition chips combined with the output signal of the Class D amplifier to obtain the actual sound information being played, and then use some audio algorithms to process the signal to suppress feedback. However, in actual use, it is difficult to limit the relative positions of the microphone and speaker, which may result in sudden feedback. While related technologies can suppress feedback, they may not be able to respond in real time when sudden feedback occurs, affecting the user experience.
[0021] To address the aforementioned issues, this application creatively proposes a novel technical solution that attempts to intervene before feedback occurs, thereby reducing the probability of sudden feedback. Specifically, during the transmission of the power amplifier's output signal to the speaker, a hardware-limited secondary feedback processing mechanism is introduced to suppress the generation of sudden energy, thus preventing feedback. Furthermore, the energy output from the power amplifier to the speaker is monitored in real time. When abnormal audio information suddenly appears in the external environment, the abnormal fluctuation in the power amplifier's output energy caused by the microphone picking up the abnormal audio is detected and promptly fed back to the main controller. This allows for real-time adjustment of the energy output corresponding to the volume, thereby reducing the abnormal volume and optimizing the user experience.
[0022] The embodiments of this application will be further described below with reference to specific scenarios.
[0023] The power amplifier control system provided in this application embodiment can be applied to audio equipment, such as Bluetooth speakers, car audio systems, broadcasting equipment, or alarm devices, etc., and it combines with a speaker to achieve sound output. Please refer to... Figure 1 The power amplifier control system 100 includes a main control module 11 and a power amplifier module 12, wherein the output terminal of the power amplifier module 12 is connected to the control terminal of the speaker 20. The power amplifier control system 100 can output energy to the speaker 20 to control the speaker 20 to produce sound, and different output energy can control the speaker 20 to output different sound effects.
[0024] Specifically, the output of the power amplifier module 12 is connected to the main control module 11 via a voltage sampling component 13 and a current sampling component 14. The voltage sampling component 13 samples the voltage of the output signal of the power amplifier module 12 and transmits the first digital signal corresponding to the sampled voltage to the main control module 11. The current sampling component 13 samples the current of the output signal of the power amplifier module 12 and transmits the second digital signal corresponding to the sampled current to the main control module 11. The main control module 11 responds to the first and second digital signals to adjust the output signal of the power amplifier module 12 according to the first and second digital signals.
[0025] The main control module 11 samples the output signal of the power amplifier module 12 in real time through the voltage sampling component 13 and the current sampling component 14. The sampled voltage and current are electrical signals directly obtained from the output of the power amplifier module 12, rather than acoustic signals sampled from the microphone or electrical signals converted from acoustic signals. This reduces signal transmission delay. Furthermore, the sampling location is at the output of the power amplifier module 12, i.e., the side of the power amplifier module 12 closest to the speaker 20, directly connected to the feedback terminal of the main control module 11. The feedback path of the sampled signal is short, ensuring a fast response time for signal transmission. This hardware-based real-time sampling of the power amplifier module's output signal using current / voltage sampling components allows the main control module 11 to obtain real-time information about the power amplifier module's output energy. In addition to using audio algorithms to suppress feedback, a hardware detection method is added, utilizing its feedback mechanism to suppress the generation of sudden energy, thereby avoiding feedback and reducing the impact of sudden feedback on the user experience.
[0026] Furthermore, the method of suppressing feedback by processing the sampled signal using audio algorithms in related technologies requires continuous high-load calculations, increasing power consumption. If feedback occurs suddenly, it may cause the power amplifier to overload instantaneously. In contrast to similar methods of suppressing feedback using audio algorithms, this solution can directly feed back to the main control module 11 based on two sets of sampling components when the power amplifier outputs abnormal energy, rather than relying solely on the detection mechanism of an external chip. For example, a multi-level detection mechanism, such as detecting the energy output of the power amplifier module through a microphone data acquisition chip and generating a detection result signal to inform the main control module 11, enables the main control module 11 to obtain the energy output of the power amplifier module 12 in real time and adjust the energy output of the power amplifier module 12 accordingly, reducing the impact of abnormal microphone volume or sudden abnormal environmental sounds on the user experience.
[0027] In some embodiments, please combine Figure 1 The voltage sampling component 13 includes a first sampling line L1, a second sampling line L2, and a first analog-to-digital converter (ADC1). The first output terminal of the power amplifier module 12 is connected to the input terminal of the first ADC1 via the first sampling line L1, and the second output terminal of the power amplifier module 12 is connected to the input terminal of the first ADC1 via the second sampling line L2. The output terminal of the first ADC1 is connected to the first feedback terminal of the main control module 11.
[0028] The first and second output terminals output mutually inverse signals to the speaker 20. For example, the output signal of the power amplifier module 12 is a differential signal. The positive signal (shown as out+ in the figure) of the differential signal is output to the speaker through the first output terminal, and the negative signal (shown as out- in the figure) of the differential signal is output to the speaker through the second output terminal. For ease of explanation, the embodiments of this application use differential signals (specifically, the positive signal out+ and the negative signal out-) as the output signals of the power amplifier module 12 for description.
[0029] Specifically, the first analog-to-digital converter (ADC1) samples the output signal's voltage through the first sampling line L1 and the second sampling line L2, converts the sampled voltage into a first digital signal, and provides this first digital signal to the main control module 11. The two sampling lines are physically isolated to avoid crosstalk issues inherent in single-line sampling; simultaneously acquiring the positive signal out+ and the negative signal out- reduces common-mode interference and improves sampling accuracy. Directly connecting the sampling lines to the first ADC1 minimizes signal transmission delay and avoids potential ground loop interference between the sampling lines and power ground. This solution utilizes a set of sampling lines (L1 and L2) to obtain the sampling voltage of the power amplifier module 12, and then converts it into a first digital signal through the first analog-to-digital converter (ADC1). This digital signal is then directly provided to the main control module 11 through the first feedback terminal (e.g., a feedback pin of the main control chip). This allows the main control module 11 to obtain the voltage status of the output signal of the power amplifier module 12 in real time based on the first digital signal. As a result, it can respond quickly when the voltage of the output signal changes abnormally. Before the acoustic feedback forms positive feedback, it can directly predict the risk of howling by the abnormal changes in the first digital signal and adjust the output signal of the power amplifier module 12 in a timely manner to reduce howling and its impact.
[0030] In some embodiments, please combine Figure 1 The current sampling component 14 includes a third sampling line L3, a fourth sampling line L4, a sampling resistor R1, and a second analog-to-digital converter (ADC2). The sampling resistor R1 is connected in series to the first output terminal of the power amplifier module 12, corresponding to the sampling of the current of the positive signal out+. Specifically, the first end of the sampling resistor R1 is connected to the first output terminal of the power amplifier module 12, and the second end of the sampling resistor R1 is used to connect to the speaker 20. The first end of the sampling resistor R1 is connected to the input terminal of the second ADC2 via the third sampling line L3, and the second end of the sampling resistor R1 is connected to the input terminal of the second ADC2 via the fourth sampling line L4. The output terminal of the second ADC2 is connected to the second feedback terminal of the main control module 11.
[0031] Specifically, the second analog-to-digital converter (ADC2) acquires the sampling current at the output of the power amplifier module 12 through the third sampling line L3, the fourth sampling line L4, and the sampling resistor R12. It then converts the sampling current into a second digital signal and provides this second digital signal to the main control module 11. This scheme obtains the voltage drop across the sampling resistor R1 using a set of sampling lines (L3 and L4), and combines this with the resistance value of R1 to obtain the current value of the sampling current in real time. The second ADC2 then converts this value into a second digital signal, which is directly provided to the main control module 11 through a second feedback terminal (e.g., a feedback pin of the main control chip). This allows the main control module 11 to obtain the current status of the power amplifier module 12's output signal in real time based on the second digital signal. Consequently, it can quickly respond to abnormal fluctuations in the output signal's current, promptly adjust the output signal of the power amplifier module 12, and reduce howling and its impact.
[0032] In some embodiments, the power amplifier control system 100 further includes a signal control line L5, through which the main control module 11 is connected to the power amplifier module 12. The main control module 11 generates a control signal in response to a first digital signal and / or a second digital signal, and transmits the control signal to the control terminal of the power amplifier module 12 via the signal control line L5, thereby adjusting the output signal of the power amplifier module 12. This scheme uses the signal control line L5 to implement a sampling feedback closed loop. The signal control line L5 can be used solely for transmitting control signals to the power amplifier module 12. When the main control module 11 detects an abnormality in the output signal of the power amplifier module 12 based on the first or second digital signal, it outputs a control signal through the signal control line L5 to regulate the output of the power amplifier module 12, thereby increasing the control rate.
[0033] It is understood that the division of modules / components / units in this solution is only for the purpose of distinguishing their functions in the power amplifier control system 100, and is not a limitation on the actual circuit structure of the system. For example, in some embodiments, the main control module 11 is the main control chip, and the circuit structure of the main control chip does not include an analog-to-digital converter. In this case, the aforementioned first analog-to-digital conversion unit ADC1 and second analog-to-digital conversion unit ADC2 can be two separately configured analog-to-digital converters, with their output terminals connected to the main control chip, respectively converting the sampling voltage and sampling current. Furthermore, in some embodiments, the aforementioned first analog-to-digital conversion unit ADC1 and / or second analog-to-digital conversion unit ADC2 can also be included in the structural design of the main control module 11. Please refer to the relevant documentation. Figure 2The main control module 11 is a single-chip microcomputer (MCU). The circuit structure of the MCU contains two analog-to-digital converters (ADCs), which can be used as the first ADC1 and the second ADC2 in the voltage / current sampling component of this solution. Based on this, the output of the power amplifier module 12 is connected to the two ADCs in the MCU through two sets of sampling lines to realize the conversion of sampling voltage / sampling current.
[0034] Please combine Figure 3 In some embodiments, the power amplifier control system 100 further includes a data acquisition module 15. For example... Figure 3 As shown, the data acquisition module 15 is connected to the output terminals of the power amplifier module 12 (the first output terminal corresponding to the positive signal out+ and the second output terminal corresponding to the negative signal out-) via audio feedback lines (L6 and L7 in the figure). It acquires the audio data corresponding to the output signal of the power amplifier module 12 and transmits the audio data to the main control module 11. This scheme sets the data acquisition module to form an audio feedback closed loop through the audio feedback lines. The acquired audio data can be used for adaptive filtering or noise cancellation algorithms to improve the listening experience.
[0035] In some embodiments, the data acquisition module 15 is also connected to the microphone 30 via the microphone acquisition line L8 for acquiring microphone data from the microphone 30. For example... Figure 3 As shown, the input signal MIC_IN of microphone 30 is transmitted to data acquisition module 15 through microphone acquisition line L8. Data acquisition module 15 acquires microphone data based on the input signal MIC_IN and synchronously transmits the microphone data to main control module 11. Main control module 11 adjusts the output signal of power amplifier module according to audio data and microphone data. For example, when Class D power amplifier outputs audio through speaker 20, microphone 30 may simultaneously acquire ambient sound and residual echoes (such as sound wave reflections) from power amplifier output. Main control module 11 can accurately identify and eliminate echo paths by comparing microphone data with the acquired audio data and generating an inverse cancellation signal through an adaptive algorithm (such as LMS), thus avoiding howling or reverberation caused by sound feedback.
[0036] Specifically, such as Figure 3 As shown, the data acquisition module 15 transmits audio data and microphone data to the main control module 11 via the first bus I 2S_1. This first bus can be a first I 2S (Inter-IC Sound) bus. This solution transmits audio data and microphone data in parallel via the first bus I 2S_1, enabling synchronized transmission of the two data signals and avoiding phase or delay differences caused by asynchronous transmission. This provides a precise data foundation for subsequent data processing. Furthermore, it reduces the number of chip pins occupied in the main control module 11, lowering PCB routing complexity and hardware costs.
[0037] like Figure 3 As shown, the main control module 11 is connected to the input terminal of the power amplifier module 12 via the second bus I 2S_2. The main control module can generate an inverse cancellation signal based on audio data and microphone data, and transmit the inverse cancellation signal to the power amplifier module via the second bus I 2S_2. This second bus can be a second I 2S bus, utilizing the low latency characteristics of the second I 2S bus to meet real-time feedback suppression requirements and improve howling suppression effect.
[0038] The power amplifier control system 100 provided in this application uses hardware constraints of current and voltage sampling components to sample the output signal of the power amplifier module in real time, obtaining the energy status of the power amplifier module's output. Based on algorithm optimization, a secondary detection mechanism is added, utilizing a feedback mechanism to suppress the generation of sudden energy, thereby avoiding howling and reducing the impact of sudden howling on user experience. If there is abnormal power amplifier output energy, it can also be directly fed back to the main control module in real time through the hardware structure. Compared to methods that use audio to suppress howling, this solution shortens the signal feedback path based on voltage or current sampling components, without relying on external chip detection mechanisms, such as microphone data acquisition chips. This allows the main control module to obtain the power amplifier's output energy status immediately when the output signal is abnormal, and adjust the power amplifier module's energy output in real time accordingly, reducing the impact of abnormal microphone volume or sudden abnormal environmental sounds on user experience.
[0039] This application provides a PCB board including the power amplifier control system 100 as described above, wherein the power amplifier control system 100 is disposed on the PCB board in the form of a circuit. The PCB board has the corresponding functional modules and beneficial effects of the power amplifier control system 100. Technical details not described in detail in the PCB board embodiment can be found in the power amplifier control system 100 provided in this application embodiment.
[0040] It should be noted that while preferred embodiments of this application are provided in the specification and accompanying drawings, this application can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are not intended to impose additional limitations on the content of this application; their purpose is to provide a more thorough and comprehensive understanding of the disclosure of this application. Furthermore, the above-described technical features can be combined with each other to form various embodiments not listed above, all of which are considered to be within the scope of this application's specification. Moreover, those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.
Claims
1. A power amplifier control system, characterized in that, The power amplifier control system includes a main control module and a power amplifier module. The output terminal of the power amplifier module is connected to the main control module through a voltage sampling component and a current sampling component. The voltage sampling component is used to sample the sampling voltage of the output signal of the power amplifier module and transmit the first digital signal corresponding to the sampling voltage to the main control module; The current sampling component is used to sample the sampling current of the output signal of the power amplifier module and transmit the second digital signal corresponding to the sampling current to the main control module; The main control module responds to the first digital signal and the second digital signal, and adjusts the output signal of the power amplifier module according to the first digital signal and the second digital signal.
2. The power amplifier control system according to claim 1, characterized in that, The voltage sampling component includes a first sampling line, a second sampling line, and a first analog-to-digital conversion unit; The first output terminal of the power amplifier module is connected to the input terminal of the first analog-to-digital converter unit through the first sampling line, and the second output terminal of the power amplifier module is connected to the input terminal of the first analog-to-digital converter unit through the second sampling line. The output terminal of the first analog-to-digital converter unit is connected to the first feedback terminal of the main control module. The first output terminal and the second output terminal are used to output mutually inverted signals to the speaker. The first analog-to-digital conversion unit obtains the sampled voltage of the output signal through the first sampling line and the second sampling line, converts the sampled voltage into a first digital signal, and provides the first digital signal to the main control module.
3. The power amplifier control system according to claim 1, characterized in that, The current sampling component includes a third sampling line, a fourth sampling line, a sampling resistor, and a second analog-to-digital conversion unit. The sampling resistor is connected in series with the first output terminal of the power amplifier module. The first end of the sampling resistor is connected to the first output terminal of the power amplifier module, and the second end of the sampling resistor is used to connect to the speaker. The first end of the sampling resistor is connected to the input terminal of the second analog-to-digital converter unit through the third sampling line, the second end of the sampling resistor is connected to the input terminal of the second analog-to-digital converter unit through the fourth sampling line, and the output terminal of the second analog-to-digital converter unit is connected to the second feedback terminal of the main control module. The second analog-to-digital conversion unit obtains the sampling current of the output signal through the third sampling line, the fourth sampling line and the sampling current, converts the sampling current into a second digital signal, and provides the second digital signal to the main control module.
4. The power amplifier control system according to claim 1, characterized in that, The power amplifier control system also includes a signal control line, and the main control module is connected to the power amplifier module through the signal control line; The main control module generates a control signal in response to the first digital signal and the second digital signal, and transmits the control signal to the control terminal of the power amplifier module through the signal modulation line, so as to adjust the output signal of the power amplifier module through the control signal.
5. The power amplifier control system according to claim 1, characterized in that, The power amplifier control system also includes a data acquisition module; the data acquisition module is connected to the output end of the power amplifier module through an audio feedback line, and is used to acquire the audio data output by the power amplifier module and transmit the audio data to the main control module.
6. The power amplifier control system according to claim 5, characterized in that, The data acquisition module is also connected to a microphone via a microphone acquisition line to acquire microphone data from the microphone and transmit the microphone data to the main control module; The main control module is also used to adjust the output signal of the power amplifier module according to the audio data and the microphone data.
7. The power amplifier control system according to claim 6, characterized in that, The data acquisition module transmits the audio data and the microphone data to the main control module via the first bus.
8. The power amplifier control system according to claim 6, characterized in that, The main control module is connected to the input terminal of the power amplifier module via a second bus; The main control module is used to generate a reverse cancellation signal based on the audio data and the microphone data, and transmit the reverse cancellation signal to the power amplifier module through the second bus.
9. A PCB board, characterized in that, Includes the power amplifier control system as described in any one of claims 1-8, wherein the power amplifier control system is disposed on the PCB board in the form of a circuit.
10. An audio device, characterized in that, The system includes a power amplifier control system and a speaker as described in any one of claims 1-8, wherein the output terminal of the power amplifier module in the power amplifier control system is connected to the control terminal of the speaker.