An all-time networked power amplifier system and fault detection method

Abstract

This application discloses an all-weather networked power amplifier system and a fault detection method, relating to the field of power amplifier system technology. The power amplifier system includes: a main control chip using an ARM Cortex-A7 core, a power amplifier circuit, and a speaker. The solution of this application controls the playback status of the power amplifier through the network and detects the working status of the power amplifier in real time. When the power amplifier system and the connected speaker malfunction, corresponding alarm information can be displayed on the server side to remind equipment maintenance personnel to perform repairs. Moreover, the ARM Cortex-A7 core main control chip has built-in Ethernet MAC and integrated PHY functions, audio decoding function, memory module, and main control module integrated into a single main control chip. Compared with existing solutions, it has higher integration, lower failure rate, and lower cost.

Description

Technical Field

[0001] This application relates to the field of power amplifier system technology, and in particular to an all-time networked power amplifier system and a fault detection method. Background Technology

[0002] Existing constant voltage power amplifiers are generally pure power amplifiers, which directly amplify and process the audio input signal and output a 100V audio voltage, which is then connected to constant voltage audio speakers for audio broadcasting.

[0003] The shortcomings of existing technologies are: 1. They cannot monitor the power amplifier status in real time; 2. They do not support automatic detection of the online status of speaker circuits; 3. Speaker faults or speaker circuit faults can only be detected on-site. Summary of the Invention

[0004] The main objective of this application is to propose an all-time networked power amplifier system and a fault detection method to at least solve one problem of the prior art.

[0005] To achieve the above objectives, one aspect of this application proposes an all-weather networked power amplifier system, the power amplifier system comprising: The main control chip adopts an ARM Cortex-A7 core. The main control chip has a built-in Ethernet MAC, integrated PHY, audio decoding function, memory module, and is equipped with a PWM output interface, a DAC analog audio output interface, an ADC input interface and an RJ45 network interface. A power amplifier circuit, the input terminal of which is used to receive audio signals; A loudspeaker is connected to the output of the power amplifier circuit. The PWM output interface and DAC analog audio output interface of the main control chip are connected to the input terminal of the power amplifier circuit through the first signal path and the second signal path, respectively, for inputting PWM signals or audio signals to the power amplifier circuit. A current detection circuit is connected in series in the output loop of the power amplifier circuit. The output terminal of the current detection circuit is connected to the first ADC input interface of the main control chip, which is used to convert the current flowing through the speaker into a voltage signal and feed it back to the main control chip. The main control chip is configured to: when the power amplifier system is idle, output a high-frequency PWM signal through the PWM output interface, and calculate and record the initial state of the speaker based on the voltage signal fed back from the first ADC input interface; when the power amplifier system is playing audio, output an audio signal through the DAC analog audio output interface, and determine the working state of the speaker by comparing the voltage signal fed back from the first ADC input interface with the initial state; if the first ADC input interface does not detect the expected feedback signal in any state, the power amplifier system circuit is determined to be faulty.

[0006] In some embodiments, the first signal path includes a first capacitor and a first resistor connected in sequence, and the second signal path includes a second capacitor and a second resistor connected in sequence; the first signal path and the second signal path are combined and connected to the input terminal of an operational amplifier, and the output terminal of the operational amplifier forms the input signal of the power amplifier circuit.

[0007] In some embodiments, the power amplifier system further includes a signal detection path, the input of which is connected to the output of the operational amplifier, and the output of which is connected to the second ADC input interface of the main control chip; the signal detection path includes a third capacitor, a third resistor, and a rectification, voltage regulation, and filtering circuit connected in sequence.

[0008] In some embodiments, the current detection circuit includes a current detection chip, a fourth resistor, and a fourth capacitor connected in series. The current detection chip is connected in series in the output circuit of the power amplifier circuit, and the other end of the fourth capacitor is connected to the first ADC input interface of the main control chip.

[0009] In some embodiments, the power amplifier circuit includes a power amplifier chip and an audio transformer connected in sequence. The input terminal of the power amplifier chip is used to receive the input signal of the power amplifier circuit, and the output terminal of the audio transformer is connected to the speaker.

[0010] To achieve the above objectives, another aspect of this application proposes a fault detection method for an all-time networked power amplifier system, applied to the aforementioned all-time networked power amplifier system. The method includes the following steps: After the speakers are connected and the power amplifier system is idle, the main control chip outputs a preset PWM signal, and the ADC measures the total current of the speaker circuit at this time. The total power or equivalent impedance of all speakers is calculated and recorded according to Ohm's law as a reference value. When the power amplifier system is idle, the main control chip outputs the PWM signal, the ADC measures the current of the current speaker circuit, calculates the current total power or equivalent impedance and compares it with the reference value. If the difference exceeds the first threshold, it is determined that a speaker is damaged or in an abnormal state. When the power amplifier system plays music, the main control chip decodes and outputs the audio signal, and detects the output value of the audio signal; when the output value reaches a set threshold, the current of the speaker circuit is detected; based on the reference value and the current current, the actual load power is calculated, and it is determined whether the load is working properly. When the main control chip outputs a signal but does not detect current in the speaker circuit or the current is lower than the second threshold, it is determined that the power amplifier system has an open circuit or short circuit fault.

[0011] In some embodiments, before outputting a preset PWM signal using the main control chip, the method further includes the following steps: In the speaker idle state configuration recording step and the speaker idle state detection step, a power amplifier shutdown control signal is first output to shut down the power amplifier, and the power amplifier is turned on again after the PWM signal stabilizes.

[0012] In some embodiments, calculating the actual load power based on the reference value and the current current, and determining whether the load is working properly, includes the following steps: Using the electric power formula P=I 2 R is used to calculate the actual load power; where I is determined based on the current current value, and R is the equivalent resistance determined based on the reference value.

[0013] In some embodiments, the method further includes the following steps: When a speaker malfunction, load malfunction, or amplifier system circuit failure is detected, the main control chip generates a corresponding fault code and sends it to the server via the network.

[0014] In some embodiments, the method further includes the following steps: When the difference between the detected speaker circuit current and the expected current value calculated based on the reference value and the current audio signal output value exceeds the third threshold, the load is judged to be malfunctioning.

[0015] The embodiments of this application include at least the following beneficial effects: This application provides a networked power amplifier system and fault detection method. The solution controls the playback status of the power amplifier through the network and detects the working status of the power amplifier in real time. When the power amplifier system and connected speakers malfunction, corresponding alarm information can be displayed on the server to remind equipment maintenance personnel to perform repairs. Moreover, it adopts an ARM Cortex-A7 core main control chip, which integrates Ethernet MAC and integrated PHY functions, audio decoding function, memory module, and main control module into a single main control chip. Compared with existing solutions, it has higher integration, lower failure rate, and lower cost. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A flowchart for fault detection provided in an embodiment of this application; Figure 2 Example diagram of the main control chip provided in the embodiments of this application; Figure 3 Example diagram of the circuit involved in signal processing provided in the embodiments of this application; Figure 4 An example diagram of another signal processing circuit provided in an embodiment of this application. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit it. In the following description, when referring to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with those of this application; they are merely examples of apparatuses and methods consistent with some aspects of the embodiments of this application as detailed in the appended claims.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0020] Before providing a detailed description of the embodiments of this application, some related technologies involved in the embodiments of this application will be described first, as follows: In view of the shortcomings of the prior art, the technical problem to be solved by this application is as follows: 1. To enhance the detection of amplifier playback status, the playback status of the amplifier can be displayed through a network server host. If an abnormality occurs, an alarm can be issued on the server side to remind equipment maintenance personnel.

[0021] 2. It can detect the status of the speakers connected to the amplifier output. When the speaker goes offline, it can detect the faulty speaker's zone location by checking the zone indicated by the server.

[0022] 3. It can detect the online status of the speaker when music is playing, and it can also detect the online status of the speaker when it is idle and not playing music, achieving detection at all times.

[0023] 4. Monitor the operating status of the power amplifier system. When a short circuit, open circuit, or burnout occurs in the power amplifier circuit, the server will notify the equipment maintenance personnel.

[0024] This application uses an ARM Cortex-A7 core main control chip, which integrates Ethernet MAC, PHY, audio decoding, memory module, and main control module into a single chip. Compared to other solutions, it has higher integration, lower failure rate, and lower cost. The main control chip integrates the above-mentioned multiple functions, but the cost is comparable to other solutions implementing a single function. In other words, this solution provides a main control chip that achieves multiple functions at the cost of one.

[0025] Meanwhile, the PWM signal generation and operational amplification, power amplification, and current detection sections of this application share the same chips and pins as the audio circuit and ACD detection. They are separated by using a main control chip to determine different states, significantly reducing costs while also simplifying the circuit structure and lowering the failure rate.

[0026] This application provides an all-time networked power amplifier system, the power amplifier system comprising: The main control chip adopts an ARM Cortex-A7 core. The main control chip has a built-in Ethernet MAC, integrated PHY, audio decoding function, memory module, and is equipped with a PWM output interface, a DAC analog audio output interface, an ADC input interface and an RJ45 network interface. A power amplifier circuit, the input terminal of which is used to receive audio signals; A loudspeaker is connected to the output of the power amplifier circuit. The PWM output interface and DAC analog audio output interface of the main control chip are connected to the input terminal of the power amplifier circuit through the first signal path and the second signal path, respectively, for inputting PWM signals or audio signals to the power amplifier circuit. A current detection circuit is connected in series in the output loop of the power amplifier circuit. The output terminal of the current detection circuit is connected to the first ADC input interface of the main control chip, which is used to convert the current flowing through the speaker into a voltage signal and feed it back to the main control chip. The main control chip is configured to: when the power amplifier system is idle, output a high-frequency PWM signal through the PWM output interface, and calculate and record the initial state of the speaker based on the voltage signal fed back from the first ADC input interface; when the power amplifier system is playing audio, output an audio signal through the DAC analog audio output interface, and determine the working state of the speaker by comparing the voltage signal fed back from the first ADC input interface with the initial state; if the first ADC input interface does not detect the expected feedback signal in any state, the power amplifier system circuit is determined to be faulty.

[0027] In some embodiments, the first signal path includes a first capacitor and a first resistor connected in sequence, and the second signal path includes a second capacitor and a second resistor connected in sequence; the first signal path and the second signal path are combined and connected to the input terminal of an operational amplifier, and the output terminal of the operational amplifier forms the input signal of the power amplifier circuit.

[0028] In some embodiments, the power amplifier system further includes a signal detection path, the input of which is connected to the output of the operational amplifier, and the output of which is connected to the second ADC input interface of the main control chip; the signal detection path includes a third capacitor, a third resistor, and a rectification, voltage regulation, and filtering circuit connected in sequence.

[0029] In some embodiments, the current detection circuit includes a current detection chip, a fourth resistor, and a fourth capacitor connected in series. The current detection chip is connected in series in the output circuit of the power amplifier circuit, and the other end of the fourth capacitor is connected to the first ADC input interface of the main control chip.

[0030] In some embodiments, the power amplifier circuit includes a power amplifier chip and an audio transformer connected in sequence. The input terminal of the power amplifier chip is used to receive the input signal of the power amplifier circuit, and the output terminal of the audio transformer is connected to the speaker.

[0031] To achieve the above objectives, another aspect of this application proposes a fault detection method for an all-time networked power amplifier system, applied to the aforementioned all-time networked power amplifier system. The method includes the following steps: After the speakers are connected and the power amplifier system is idle, the main control chip outputs a preset PWM signal, and the ADC measures the total current of the speaker circuit at this time. The total power or equivalent impedance of all speakers is calculated and recorded according to Ohm's law as a reference value. When the power amplifier system is idle, the main control chip outputs the PWM signal, the ADC measures the current of the current speaker circuit, calculates the current total power or equivalent impedance and compares it with the reference value. If the difference exceeds the first threshold, it is determined that a speaker is damaged or in an abnormal state. When the power amplifier system plays music, the main control chip decodes and outputs the audio signal, and detects the output value of the audio signal; when the output value reaches a set threshold, the current of the speaker circuit is detected; based on the reference value and the current current, the actual load power is calculated, and it is determined whether the load is working properly. When the main control chip outputs a signal but does not detect current in the speaker circuit or the current is lower than the second threshold, it is determined that the power amplifier system has an open circuit or short circuit fault.

[0032] In some embodiments, before outputting a preset PWM signal using the main control chip, the method further includes the following steps: In the speaker idle state configuration recording step and the speaker idle state detection step, a power amplifier shutdown control signal is first output to shut down the power amplifier, and the power amplifier is turned on again after the PWM signal stabilizes.

[0033] In some embodiments, calculating the actual load power based on the reference value and the current current, and determining whether the load is working properly, includes the following steps: Using the electric power formula P=I 2 R is used to calculate the actual load power; where I is determined based on the current current value, and R is the equivalent resistance determined based on the reference value.

[0034] In some embodiments, the method further includes the following steps: When a speaker malfunction, load malfunction, or amplifier system circuit failure is detected, the main control chip generates a corresponding fault code and sends it to the server via the network.

[0035] In some embodiments, the method further includes the following steps: When the difference between the detected speaker circuit current and the expected current value calculated based on the reference value and the current audio signal output value exceeds the third threshold, the load is judged to be malfunctioning.

[0036] The following sections will provide a detailed description and explanation of some optional embodiments of this application, using specific application examples.

[0037] Figure 1 As per the fault detection process in this embodiment, the power amplifier system in this embodiment uses an ARM Cortex-A7 core main control chip. The power amplifier is connected to the host via a network cable to obtain the host's control and playback information. Then, the main control chip decodes the digital signal transmitted from the network into an analog signal. The analog signal is amplified by the power amplifier circuit and sent to the speaker to emit sound.

[0038] After the amplifier system is connected to the required speakers, the initial configuration is recorded. At this time, the PWM pin generates a 23kHz high-frequency signal, which is amplified and then enters the amplifier system. It then passes through the speakers (the human hearing range is 20-20kHz; a 23kHz signal, after amplification, is inaudible to the human ear). Because the PWM output voltage is fixed, the current through the speaker is calculated using ADC2. Based on Ohm's law, the total power of all speakers connected to the amplifier circuit can be calculated. If initially 10 speakers are connected, and some speakers fail over time, the current detected by ADC2 will differ from before, indicating that some speakers are damaged. This allows for monitoring the speaker status of the amplifier system even when no music is playing.

[0039] When playing music, ADC1 detects the magnitude of the decoded analog signal. When the music signal output value reaches a pre-designed threshold, the current at the ADC2 terminal should be measured, and a current value reaching the set threshold should be generated. Through calculation and comparison, since the load magnitude is already known through PWM detection during idle periods, Ohm's law can be substituted into the power formula P=I0. 2 R can calculate and determine the power during playback, indicating that the power amplifier system is operating normally.

[0040] The PWM input state and music input state are mutually exclusive. When the broadcast system is playing music, the PWM signal input is automatically turned off. When the main controller has a music signal or PWM signal input, the ADC will definitely detect the output current. If it cannot detect it, it is determined that there is an open circuit or short circuit fault in the power amplifier system. The main controller will send the corresponding fault code to the server to notify the equipment maintenance personnel.

[0041] like Figure 2As shown, the main control chip uses an ARM Cortex-A7 core and has a dedicated PWM output interface, ADC input interface, DAC analog audio output decoding interface, and RJ45 network output interface.

[0042] like Figure 3 As shown, the output PWM signal and analog audio signal pass through C43, R25 and C45, R26 respectively, and then enter the first operational amplifier of the SGM8904 dual-channel operational amplifier to output the AUX OUT signal to the power amplifier. The AUX OUT signal also passes through C44, R24 and then enters another operational amplifier for amplification. After being filtered and regulated by C48, D3, D4, R30, R31, R32, C53, it enters the ADC1 pin for detection, which can detect the magnitude of the PWM signal and analog audio signal output by the main control chip. When the network amplifier is idle, there is no sound output from the speakers. The main controller detects this and outputs an amplifier shutdown control signal to turn off the amplifier, preventing a hissing sound when switching PWM signals. Then, the main controller outputs a 3V PWM signal (PWM_IN) with a 30% duty cycle. Simultaneously, the main control chip turns on the amplifier. The input signal is amplified by the op-amp, then filtered and regulated by C48, D3, D4, R30, R31, R32, and C53 to obtain a voltage signal of approximately 3V. This value is then compared with the ADC2 detection signal output from the subsequent stage. If the ADC2 detection value is around 3.3V, it indicates the amplifier is at full load; if it's less than 1V, it indicates the amplifier output is connected to relatively few speakers. The principle behind this detection scheme is as follows: after the speakers connected to the amplifier are installed, the speaker impedance is configured and recorded, generating a PWM signal. The current generated by the load at that time is recorded and then converted into voltage by the op-amp circuit, provided to the ADC2 pin for detection. The main control chip records this voltage value for later comparison. When the number of speakers is increased or decreased, or when a short circuit or open circuit occurs, the voltage detected by ADC2 will change. A small change is attributed to temperature fluctuations; a large change will send a fault code indicating a speaker malfunction to the server, prompting equipment administrators to inspect the equipment. When ADC2 detects no current or very little current, it indicates a short circuit or open circuit fault in the power amplifier system, alerting equipment administrators to check the power amplifier's functionality.

[0043] When the network amplifier decodes and plays audio signals transmitted from the network, the main control chip immediately shuts down the amplifier to prevent any jitter during signal switching. Then, once decoding and playback begin, the amplifier is immediately turned on. At this time, pin ACD1 detects the voltage of the audio signal output by the main control chip. When the voltage exceeds 2V, the current detection mechanism on pin ADC2 is triggered. The main control chip calculates the current based on the load detected during idle periods. For example (under full load, ACD2 will output an ADC voltage of approximately 2.8V). If the difference is too large, a fault code indicating a speaker malfunction is sent to the server, prompting the equipment administrator to check the equipment. When ADC2 detects no current or very little current, it indicates a short circuit or open circuit fault in the amplifier system, alerting the equipment administrator to check the amplifier's functionality.

[0044] like Figure 4 As shown, the AUX OUT signal passes through C34 and enters operational amplifier U1, then the power amplifier chip TPA3255 for amplification, outputting a 33V audio voltage signal. This signal then passes through an audio transformer, boosting the 33V to 100V before connecting to a constant-voltage loudspeaker. Simultaneously, chip U2, connected in series at the amplifier output, is a circuit detection chip ACS712-05B. It detects the amplifier's output current, converts it into a corresponding voltage value, and then passes through C26 and R15 before entering operational amplifier U3 (SGM8904) for amplification. The output is then filtered and regulated by C42, R20, D1, D2, R21, R22, and R23 before entering pin ADC2 for detection. This detects the amplifier's output current and serves as an important indicator of the operating status of the subsequent power amplifier load.

[0045] In summary, it should be noted that in this embodiment, the PWM signal generation and operational amplification, power amplification, current detection, audio circuit, and ACD detection all share the same processing chip and signal processing channel as the audio section. Specifically, the main control chip determines different states and then time-division multiplexes the corresponding processing chip and signal processing channel, which can significantly reduce hardware costs, while also simplifying the circuit structure and reducing the failure rate.

[0046] This embodiment provides a full-time networked power amplifier system, which is a digital constant-voltage broadcast power amplifier connected to a server via a network. The system allows for network control of the amplifier's playback status and real-time monitoring of its operating status. When any abnormality occurs in the power amplifier system or the connected speakers, corresponding alarm messages can be displayed on the server to alert maintenance personnel for repairs. This embodiment offers the following advantages: 1. The power amplifier connects to the server via the network, and the power amplifier's working status can be detected on the server side in real time.

[0047] 2. The power amplifier is connected to the server via the network, allowing for real-time monitoring and operation of the power amplifier on the server side.

[0048] 3. It can detect the amplifier's working status and speaker load connection status at all times, both when playing music and when not playing music.

[0049] 4. Real-time monitoring can be achieved in the computer room, eliminating the need for on-site inspections and saving a lot of manpower and resources, especially in large outdoor scenic areas.

[0050] 5. It adopts an ARM Cortex-A7 core main control chip, which integrates Ethernet MAC and integrated PHY functions, audio decoding function, memory module, and main control module into one chip. Compared with other solutions, it has higher integration and relatively lower failure rate and cost.

[0051] 6. The PWM signal generation and operational amplification, power amplification, and current detection sections all share the same chips and pins as the audio circuit and ACD detection. They are separated by using the main control chip to determine different states, significantly reducing costs while simplifying the circuit structure and lowering the failure rate.

[0052] The embodiments described in this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided by the embodiments of this application. As those skilled in the art will know, with the evolution of technology and the emergence of new application scenarios, the technical solutions provided by the embodiments of this application are also applicable to similar technical problems.

[0053] Those skilled in the art will understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of this application, and may include more or fewer technical solutions than shown, or a combination of certain technical solutions, or different technical solutions.

[0054] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0055] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0056] The preferred embodiments of the present application have been described above with reference to the accompanying drawings, but this does not limit the scope of the claims of the present application. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and substance of the embodiments of the present application shall be within the scope of the claims of the present application.

Claims

1. A networked power amplifier system that operates around the clock, characterized in that, The power amplifier system includes: The main control chip adopts an ARM Cortex-A7 core. The main control chip has a built-in Ethernet MAC, integrated PHY, audio decoding function, memory module, and is equipped with a PWM output interface, a DAC analog audio output interface, an ADC input interface and an RJ45 network interface. A power amplifier circuit, the input terminal of which is used to receive audio signals; A loudspeaker is connected to the output of the power amplifier circuit. The PWM output interface and DAC analog audio output interface of the main control chip are connected to the input terminal of the power amplifier circuit through the first signal path and the second signal path, respectively, for inputting PWM signals or audio signals to the power amplifier circuit. A current detection circuit is connected in series in the output loop of the power amplifier circuit. The output terminal of the current detection circuit is connected to the first ADC input interface of the main control chip, which is used to convert the current flowing through the speaker into a voltage signal and feed it back to the main control chip. The main control chip is configured to: when the power amplifier system is idle, output a high-frequency PWM signal through the PWM output interface, and calculate and record the initial state of the speaker based on the voltage signal fed back from the first ADC input interface; when the power amplifier system is playing audio, output an audio signal through the DAC analog audio output interface, and determine the working state of the speaker by comparing the voltage signal fed back from the first ADC input interface with the initial state; if the first ADC input interface does not detect the expected feedback signal in any state, the power amplifier system circuit is determined to be faulty.

2. The all-weather networked power amplifier system according to claim 1, characterized in that, The first signal path includes a first capacitor and a first resistor connected in sequence, and the second signal path includes a second capacitor and a second resistor connected in sequence; the first signal path and the second signal path are combined and connected to the input terminal of the operational amplifier, and the output terminal of the operational amplifier forms the input signal of the power amplifier circuit.

3. The all-weather networked power amplifier system according to claim 2, characterized in that, The power amplifier system also includes a signal detection path, the input of which is connected to the output of the operational amplifier, and the output of which is connected to the second ADC input interface of the main control chip; the signal detection path includes a third capacitor, a third resistor, and a rectification, voltage regulation and filtering circuit connected in sequence.

4. The all-weather networked power amplifier system according to claim 1, characterized in that, The current detection circuit includes a current detection chip, a fourth resistor, and a fourth capacitor connected in series. The current detection chip is connected in series in the output circuit of the power amplifier circuit, and the other end of the fourth capacitor is connected to the first ADC input interface of the main control chip.

5. A full-time networked power amplifier system according to any one of claims 1 to 4, characterized in that, The power amplifier circuit includes a power amplifier chip and an audio transformer connected in sequence. The input terminal of the power amplifier chip is used to receive the input signal of the power amplifier circuit, and the output terminal of the audio transformer is connected to the speaker.

6. A fault detection method for an all-time networked power amplifier system, characterized in that, Applied to the all-weather networked power amplifier system as described in claim 1, the method includes the following steps: After the speakers are connected and the power amplifier system is idle, the main control chip outputs a preset PWM signal, and the ADC measures the total current of the speaker circuit at this time. The total power or equivalent impedance of all speakers is calculated and recorded according to Ohm's law as a reference value. When the power amplifier system is idle, the main control chip outputs the PWM signal, the ADC measures the current of the current speaker circuit, calculates the current total power or equivalent impedance and compares it with the reference value. If the difference exceeds the first threshold, it is determined that a speaker is damaged or in an abnormal state. When the power amplifier system plays music, the main control chip decodes and outputs the audio signal, and detects the output value of the audio signal; when the output value reaches a set threshold, the current of the speaker circuit is detected; based on the reference value and the current current, the actual load power is calculated, and it is determined whether the load is working properly. When the main control chip outputs a signal but does not detect current in the speaker circuit or the current is lower than the second threshold, it is determined that the power amplifier system has an open circuit or short circuit fault.

7. The fault detection method for a full-time networked power amplifier system according to claim 6, characterized in that, Before the main control chip outputs a preset PWM signal, the method further includes the following steps: In the speaker idle state configuration recording step and the speaker idle state detection step, a power amplifier shutdown control signal is first output to shut down the power amplifier, and the power amplifier is turned on again after the PWM signal stabilizes.

8. The fault detection method for a full-time networked power amplifier system according to claim 6, characterized in that, The step of calculating the actual load power and determining whether the load is working properly based on the reference value and the current current includes the following steps: Using the electric power formula P=I 2 R is used to calculate the actual load power; where I is determined based on the current current value, and R is the equivalent resistance determined based on the reference value.

9. The fault detection method for a full-time networked power amplifier system according to claim 6, characterized in that, The method further includes the following steps: When a speaker malfunction, load malfunction, or amplifier system circuit failure is detected, the main control chip generates a corresponding fault code and sends it to the server via the network.

10. The fault detection method for a full-time networked power amplifier system according to claim 6, characterized in that, The method further includes the following steps: When the difference between the detected speaker circuit current and the expected current value calculated based on the reference value and the current audio signal output value exceeds the third threshold, the load is judged to be malfunctioning.

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