A POE powered audio power amplification method, device and equipment

Abstract

The present invention discloses a POE-powered audio power amplification method, device, and equipment, comprising: obtaining a first audio signal and performing power amplification processing on the first audio signal; wherein, during the power amplification process, controlling the input voltage of the circuit used for audio power amplification so that the power consumption of the circuit does not exceed a first set threshold; and detecting the SPWM duty cycle of the audio signal after power amplification in real time; when it is detected that the SPWM duty cycle exceeds a second set threshold, reducing the power amplifier gain during the audio power amplification process to reduce the audio amplitude; and outputting a second audio signal after the first audio signal has completed power amplification. By forming a closed-loop automatic gain control system consisting of a power supply and a power amplifier, a standard POE-powered audio power amplifier is produced, so that the power amplifier output does not exhibit clipping distortion and the overall power consumption does not exceed the power protection threshold of the POE power supply device.

Description

Technical Field

[0001] The present invention relates to the field of audio technology, and in particular to a POE-powered audio power amplification method, device, and equipment. Background Art

[0002] Currently, the existing POE power supply standards are divided into IEEE 802.3af (maximum available power of 13W for devices), IEEE 802.3at (maximum available power of 25.5W for devices), and IEEE 802.3bt (maximum available power of 71W for devices), with constant voltage power supplies being the primary standard. The power consumption of POE amplifiers cannot exceed the maximum available power of each standard, and short-term overloads will cause a protection lock. The current mainstream architectures include isolated DC-DC switching power supplies with digital amplifiers and non-isolated DC-DC switching power supplies with digital amplifiers. The non-isolated DC-DC switching power supply architecture is slightly more efficient, but the dedicated chip costs are higher. The isolated DC-DC switching power supply architecture is slightly less efficient but offers a high cost-performance ratio.

[0003] The existing non-isolated DC-DC POE-powered audio system, combined with a digital amplifier bridge output architecture, can improve adaptability by selecting a switching power supply according to the scenario. However, when the POE power supply device is overloaded, the amplifier supply voltage will be reduced, resulting in clipping and distortion of the amplifier output. Summary of the Invention

[0004] The present invention provides a POE-powered audio power amplification method, device and equipment to solve the technical problem that in a non-isolated DC-DC POE-powered audio power amplification system, the power amplifier output is clipped and distorted, resulting in broken sound due to the reduction of the power amplifier supply voltage during overload protection.

[0005] In order to solve the above technical problems, in a first aspect, an embodiment of the present invention provides a POE-powered audio power amplification method, comprising:

[0006] Acquire a first audio signal and perform power amplification processing on the first audio signal; wherein, during the power amplification process, control the input voltage of the circuit for audio power amplification so that the power consumption of the circuit does not exceed a first set threshold; and detect the SPWM duty cycle of the power-amplified audio signal in real time;

[0007] When it is detected that the SPWM duty cycle exceeds a second set threshold, reducing the power amplifier gain in the audio power amplification process to reduce the audio amplitude;

[0008] When the power amplification of the first audio signals is completed, the second audio signal is output.

[0009] The present invention controls the input voltage of the circuit used for audio power amplification during the audio power amplification process, thereby ensuring that the power supply voltage can be reduced when the power supply is overloaded without triggering the POE power supply overload protection. At the same time, after the audio power is amplified, the SPWM duty cycle is detected to adjust the audio signal amplitude, thereby reducing the output of the digital power amplifier and ensuring that the digital power amplifier does not suffer from clipping distortion. By combining the adjustment of voltage and the adjustment of audio signal amplitude, a closed loop of automatic gain control is formed consisting of a power supply and a digital power amplifier device, so that the power amplifier output does not suffer from clipping distortion. At the same time, the power consumption of the device does not exceed the power protection threshold of the POE power supply device, which is a standard POE power supply.

[0010] Furthermore, during the power amplification process, the input voltage of the circuit for audio power amplification is controlled so that the power consumption of the circuit does not exceed a first set threshold, specifically:

[0011] Set the current protection threshold and current sampling period, and sample and detect the current in a cycle-by-cycle manner according to the current sampling period;

[0012] When it is detected that the current exceeds the protection threshold, the duty cycle of the PWM signal of the power supply for the audio power amplifier circuit is reduced to reduce the input voltage of the audio amplifier circuit, thereby adjusting the power consumption of the circuit to not exceed the first set threshold.

[0013] The present invention sets a current effective value protection threshold, and through this negative feedback, it can ensure that the power consumption of the device is constant and will not exceed the POE protection threshold to trigger the POE power supply device protection lock, thereby avoiding overload protection of the POE power supply device.

[0014] Furthermore, when it is detected that the SPWM duty cycle exceeds the second set threshold, the power amplifier gain in the audio power amplification process is reduced to reduce the audio amplitude, specifically:

[0015] Perform SPWM sampling on the power-amplified audio signal in real time;

[0016] When it is detected that the SPWM duty cycle exceeds the second set threshold, a DC signal is output to reduce the power amplifier gain used for audio power amplification to reduce the audio signal adjustment amplitude, thereby adjusting the power amplifier output power of the audio amplifier power circuit to not exceed the third set threshold.

[0017] The present invention detects that the SPWM duty cycle becomes larger and exceeds a second set threshold value, and outputs a DC signal to control the audio signal amplitude adjustment unit to reduce the preamplification gain, thereby reducing the power amplifier output voltage and adjusting the power amplifier output power of the device not to exceed the set value, so as to avoid clipping distortion caused by excessive power amplifier output voltage and the occurrence of broken sound.

[0018] Furthermore, the obtaining of the first audio signal and performing power amplification processing on the first audio signal is specifically:

[0019] Acquire a network signal through network transmission, and decode the network signal into a first audio signal;

[0020] And according to the preset preamplification gain and power amplifier gain, the first audio signal is subjected to audio power amplification processing.

[0021] The present invention obtains and decodes network signals through a network transceiver and audio decoding device, and simultaneously performs gain amplification on the decoded audio signals according to a pre-signal processing device.

[0022] In a second aspect, an embodiment of the present invention provides a POE-powered audio power amplifier device, comprising: an audio power amplifier module, an audio amplitude modulation module, and an audio signal output module;

[0023] The audio power amplification module is configured to obtain a first audio signal and perform power amplification processing on the first audio signal; wherein, during the power amplification process, the input voltage of the circuit used for audio power amplification is controlled so that the power consumption of the circuit does not exceed a first set threshold; and the SPWM duty cycle of the audio signal after power amplification is detected in real time;

[0024] The audio amplitude modulation module is configured to reduce the power amplifier gain during the audio power amplification process to reduce the audio amplitude when detecting that the SPWM duty cycle exceeds a second set threshold;

[0025] The audio signal output module is configured to output a second audio signal after the first audio signals have completed power amplification.

[0026] Furthermore, the audio power amplification module is further used to:

[0027] Set the current protection threshold and current sampling period, and sample and detect the current in a cycle-by-cycle manner according to the current sampling period;

[0028] When it is detected that the current exceeds the protection threshold, the duty cycle of the PWM signal of the power supply for the audio power amplifier circuit is reduced to reduce the input voltage of the audio amplifier circuit, thereby adjusting the power consumption of the circuit to not exceed the first set threshold.

[0029] Furthermore, the audio amplitude modulation module is specifically used to:

[0030] Perform SPWM sampling on the power-amplified audio signal in real time;

[0031] When it is detected that the SPWM duty cycle exceeds the second set threshold, a DC signal is output to reduce the power amplifier gain used for audio power amplification to reduce the audio signal adjustment amplitude, thereby adjusting the power amplifier output power of the audio amplifier power circuit to not exceed the third set threshold.

[0032] Furthermore, the audio power amplification module is further used to:

[0033] Acquire a network signal through network transmission, and decode the network signal into a first audio signal;

[0034] The first audio signal is subjected to audio power amplification processing according to a preset preamplification gain and a power amplifier gain.

[0035] In a third aspect, an embodiment of the present invention provides a computer device comprising: a processor, a communication interface and a memory, wherein the processor, the communication interface and the memory are interconnected, wherein the memory stores an executable program code, and the processor is used to call the executable program code to execute the POE-powered audio power amplification method.

[0036] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium having computer instructions stored thereon, which, when executed by a processor, implements the POE-powered audio power amplification method. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic flow chart of a POE-powered audio power amplification method provided in an embodiment of the present invention;

[0038] Figure 2 Another schematic flow chart of a POE-powered audio power amplification method according to an embodiment of the present invention;

[0039] Figure 3 A schematic structural diagram of a POE-powered audio power amplifier device provided in an embodiment of the present invention;

[0040] Figure 4 Another structural diagram of a POE-powered audio power amplifier device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0042] Example 1

[0043] Please refer to Figure 1 , Figure 1 A flowchart of a POE-powered audio power amplification method provided by an embodiment of the present invention includes steps 101 to 103, which are specifically as follows:

[0044] Step 101: Acquire a first audio signal and perform power amplification processing on the first audio signal; wherein, during the power amplification process, control the input voltage of a circuit for audio power amplification so that the power consumption of the circuit does not exceed a first set threshold; and detect the SPWM duty cycle of the power-amplified audio signal in real time;

[0045] Step 102: When it is detected that the SPWM duty cycle exceeds a second set threshold, reducing the power amplifier gain in the audio power amplification process to reduce the audio amplitude;

[0046] Step 103: After the first audio signals have completed power amplification, a second audio signal is output.

[0047] In this embodiment, before obtaining the first audio signal and performing power amplification processing on the first audio signal, the method further includes:

[0048] The DC voltage is divided into a first power supply voltage and a second power supply voltage by a DC-DC switching power supply.

[0049] In this embodiment, the acquiring of the first audio signal and the power amplification of the first audio signal are specifically as follows:

[0050] Acquire a network signal through network transmission, and decode the network signal into a first audio signal;

[0051] And according to the preset preamplification gain and power amplifier gain, the first audio signal is subjected to audio power amplification processing.

[0052] In this embodiment, the network signal is transmitted through the network and is sent to the network transceiver and audio decoding device after passing through the interface. The network transceiver and audio decoding device decodes the network signal to obtain the first audio signal.

[0053] In this embodiment, the circuit for audio power amplification includes a pre-signal processing circuit for pre-amplifying the audio signal, a digital power amplifier for amplifying the audio power of the audio signal, and a fixed-impedance speaker for outputting the audio signal.

[0054] In this embodiment, the network signal is acquired and decoded by the network transceiver and audio decoding device, and the decoded audio signal is amplified by the pre-signal processing device.

[0055] Please refer to Figure 2 , Figure 2 Another flowchart of the POE-powered audio power amplification method provided by an embodiment of the present invention is provided.

[0056] As a specific example of an embodiment of the present invention, a host transmits audio streaming media and a constant voltage 48V DC power supply to an RJ45 port via a POE switch. The POE power is then sent to a DC-DC switching power supply unit, where it is converted to DC power for the digital amplifier. Another set of power supplies is converted to 5V DC to power the network transceiver and decoder, the pre-signal unit, and the SPWM duty cycle adjustment device. The SPWM duty cycle adjustment device is used to detect the SPWM duty cycle of the amplified audio signal in real time. The SPWM duty cycle adjustment device includes an SPWM duty cycle detection device and a signal amplitude adjustment circuit.

[0057] In this embodiment, the audio amplification circuit includes: a network transceiver and decoder, a pre-signal unit, an SPWM duty cycle detection device, and a signal amplitude adjustment circuit.

[0058] In this embodiment, the audio power amplification process is specifically as follows: the network signal is input to the network transceiver and decoded into the audio signal U by the decoding unit. in Then it is sent to the preamplifier signal processing circuit and the preamplifier gain G pre Perform pre-amplification and amplify G pre After double the amount, you will get U in1 , the specific formula for preamplification is:

[0059] U in1 =U in *G pre (1)

[0060] Processed audio signal U in1 Input to the digital power amplifier device, and according to the power amplifier gain G amp Zoom in, zoom in G amp After double the amount, you will get U amp_out , the specific formula for power amplifier amplification is:

[0061] U amp_out =U in1 *G amp =U in *G pre *G amp (2)

[0062] Finally, the audio power signal U is output through a fixed group of speakers. amp_out .

[0063] In this embodiment, during the power amplification process, the input voltage of the circuit for audio power amplification is controlled so that the power consumption of the circuit does not exceed a first set threshold value, specifically:

[0064] Set the current protection threshold and current sampling period, and sample and detect the current in a cycle-by-cycle manner according to the current sampling period;

[0065] When it is detected that the current exceeds the protection threshold, the duty cycle of the PWM signal of the power supply for the audio power amplifier circuit is reduced to reduce the input voltage of the audio amplifier circuit, thereby adjusting the power consumption of the circuit to not exceed the first set threshold.

[0066] In this embodiment, due to an excessively large input signal, the amplifier output will also be excessive, and an unchanged load will result in overload. When the input signal is too large or when playing music with a high low-frequency component, the actual impedance of the speaker load within the 20-100Hz frequency band will be less than the rated impedance at 1kHz, resulting in excessive amplifier output power.

[0067] In this embodiment, by setting the current effective value protection threshold, this negative feedback can ensure that the device power consumption is constant and does not exceed the POE protection threshold to trigger the POE power supply device protection lock, thereby avoiding overload protection of the POE power supply device.

[0068] In this embodiment, a primary current detection unit of a DC-DC switching power supply is provided. When the instantaneous current exceeds the protection threshold, the duty cycle of the power supply PWM signal is reduced to reduce the output voltage, that is, the input voltage of the circuit. As shown in Formula 3, when P ps (power consumption of the device) and I ps When the (primary current effective value protection threshold) is constant, the primary current effective value protection threshold is reasonably set. When the primary current effective protection threshold increases, the P can be maintained by reducing the output voltage. ps constant, so that P can be guaranteed ps The voltage will not exceed the POE protection threshold and trigger the POE power supply device protection lock.

[0069] P ps =U ps *I ps (3)

[0070] In this embodiment, the primary current detection and optocoupler feedback scheme have smaller delays and faster response speeds, and can quickly limit the current to avoid overload protection of the POE power supply equipment.

[0071] In this embodiment, when it is detected that the SPWM duty cycle exceeds the second set threshold, the power amplifier gain in the audio power amplification process is reduced to reduce the audio amplitude, specifically:

[0072] Perform SPWM sampling on the power-amplified audio signal in real time;

[0073] When it is detected that the SPWM duty cycle exceeds the second set threshold, a DC signal is output to reduce the power amplifier gain used for audio power amplification to reduce the audio signal adjustment amplitude, thereby adjusting the power amplifier output power of the audio amplifier power circuit to not exceed the third set threshold.

[0074] In this embodiment, when it is detected that the SPWM duty cycle becomes larger and exceeds the second set threshold, a DC signal is output to control the audio signal amplitude adjustment unit to reduce the preamplifier gain, thereby reducing the power amplifier output voltage and adjusting the power amplifier output power of the device not to exceed the set value, so as to avoid clipping distortion caused by excessive power amplifier output voltage and the occurrence of broken sound.

[0075] In this embodiment, the speaker is used as the load of the audio amplifier in certain low frequency bands. (speaker transient impedance) will be less than R 扬声器额定 (rated impedance) causes the output power to be greater than the rated power, triggering the current limiting protection of the power supply, making P ps Tends to be constant.

[0076] In this embodiment, the calculation formula for the power consumption of the power amplifier is specifically:

[0077] P amp =P ps *η ps (4)

[0078]

[0079] Among them, η ps For power efficiency.

[0080] In this embodiment, the calculation formula for the power amplifier output power is specifically:

[0081]

[0082] Among them, η ps is the power efficiency, η amp is the power amplifier efficiency, U amp_out The effective value voltage of the power amplifier output.

[0083] In this embodiment, since the power efficiency η ps and power amplifier efficiency η amp constant, then the power consumption of the amplifier is P ampAnd the amplifier output power P amp_out It is also constant.

[0084] In this embodiment, the formula for calculating the power consumption of the device is as follows:

[0085]

[0086]

[0087] The specific formula for calculating the power supply output voltage is:

[0088]

[0089] Here, k is the peak factor, which varies according to different waveforms.

[0090] The specific formula for calculating the effective value voltage of the power amplifier is:

[0091]

[0092] Then, the power consumption of the device is specifically:

[0093]

[0094] In this embodiment, P ps 、U in , G amp ,η ps ,η amp is a fixed value, and U ps_out is a variable, k is the peak factor, which changes according to the waveform. So, when R speak_tran When it becomes smaller, in order to maintain P ps Constant, U ps_out must become smaller at the same time. If G pre constant It will increase, causing the duty cycle of the SPWM power signal modulated by the power amplifier to become larger, and clipping distortion will occur.

[0095] In this embodiment, an SPWM duty cycle detection device is provided to detect that when the SPWM duty cycle becomes larger, a DC signal is output to control the audio signal amplitude adjustment unit to reduce the G pre , so that G pre Become a variable, by reducing the input audio signal amplitude, thereby reducing the amplifier output voltage, maintaining P amp_out Constant, eventually maintaining P ps Constant.

[0096] In this embodiment, cycle-by-cycle current limiting ensures that reducing the power supply voltage in the event of an overload does not trigger the POE power supply protection. When the power supply voltage drops, SPWM pulse width limiting is triggered, reducing the amplitude of the preamplifier signal and, consequently, the output amplitude of the power amplifier, while also ensuring that the output does not experience clipping distortion. By implementing a closed-loop automatic gain control system comprised of the power supply and power amplifier, the power amplifier output is free of clipping distortion, while the overall power consumption does not exceed the power protection threshold of the POE power supply device, resulting in a standard POE-powered audio power amplifier.

[0097] Please refer to Figure 3 , Figure 3 A schematic structural diagram of a POE-powered audio power amplifier device provided in an embodiment of the present invention includes: an audio power amplifier module 301, an audio amplitude modulation module 302, and an audio signal output module 303;

[0098] The audio power amplification module 301 is configured to obtain a first audio signal and perform power amplification processing on the first audio signal; wherein, during the power amplification process, the input voltage of the circuit used for audio power amplification is controlled so that the power consumption of the circuit does not exceed a first set threshold; and the SPWM duty cycle of the audio signal after power amplification is detected in real time;

[0099] The audio amplitude modulation module 302 is configured to reduce the power amplifier gain during the audio power amplification process to reduce the audio amplitude when detecting that the SPWM duty cycle exceeds a second set threshold;

[0100] The audio signal output module 303 is configured to output a second audio signal after the first audio signals have completed power amplification.

[0101] In this embodiment, the POE-powered audio power amplifier device further includes a power supply device, which includes a POE switch, an interface, and a DC-DC switching power supply.

[0102] In this embodiment, the host transmits audio streaming media and constant voltage 48V DC power supply to the RJ45 interface through the POE switch, wherein the POE power supply is sent to the DC-DC switching power supply unit to be converted into the first power supply voltage and the second power supply voltage.

[0103] In this embodiment, the audio power amplification module is further used to:

[0104] Acquire a network signal through network transmission, and decode the network signal into a first audio signal;

[0105] The first audio signal is subjected to audio power amplification processing according to a preset preamplification gain and a power amplifier gain.

[0106] In this embodiment, the audio power amplification module is further used to:

[0107] Set the current protection threshold and current sampling period, and sample and detect the current in a cycle-by-cycle manner according to the current sampling period;

[0108] When it is detected that the current exceeds the protection threshold, the duty cycle of the PWM signal of the power supply for the audio power amplifier circuit is reduced to reduce the input voltage of the audio amplifier circuit, thereby adjusting the power consumption of the circuit to not exceed the first set threshold.

[0109] In this embodiment, the audio power amplification module specifically includes: a network transceiver and decoder device, a front signal unit and a digital power amplifier device.

[0110] In this embodiment, the network signal is input into the network transceiver and decoding unit, decoded into an audio signal, and sent to the pre-signal processing circuit, where it is pre-amplified according to the pre-amplification gain. The pre-amplified audio signal is then transmitted to the digital power amplifier device for audio power amplification.

[0111] In this embodiment, the audio power amplification module also includes a primary current detection unit, which is used to reduce the duty cycle of the power supply PWM signal and the output voltage when it detects that the instantaneous current exceeds the protection threshold, that is, to reduce the input voltage of the circuit.

[0112] In this embodiment, the audio amplitude modulation module is specifically used to:

[0113] Perform SPWM sampling on the power-amplified audio signal in real time;

[0114] When it is detected that the SPWM duty cycle exceeds the second set threshold, a DC signal is output to reduce the power amplifier gain used for audio power amplification to reduce the audio signal adjustment amplitude, thereby adjusting the power amplifier output power of the audio amplifier power circuit to not exceed the third set threshold.

[0115] In this embodiment, the audio amplitude modulation module includes an SPWM duty cycle detection device and a signal amplitude adjustment circuit. When the SPWM duty cycle is detected to be larger, a DC signal is output to control the audio signal amplitude adjustment unit to reduce G pre , so that G pre Become a variable, by reducing the input audio signal amplitude, thereby reducing the amplifier output voltage, maintaining P amp_out Constant, eventually maintaining P ps Constant.

[0116] In this embodiment, the audio signal output module is specifically a fixed-impedance speaker, which outputs audio signals when the audio signals have completed power amplification.

[0117] Please refer to Figure 4 , Figure 4 Another structural diagram of a POE-powered audio power amplifier device provided in an embodiment of the present invention.

[0118] In this embodiment, the POE-powered audio power amplifier device includes: an RJ45 interface, a network transceiver and audio decoding device, a DC-DC switching power supply, a primary current detection unit, a front-end signal processing circuit, a digital power amplifier device, an SPWM pulse width detection device and a fixed-resistance speaker.

[0119] In this embodiment, the host transmits network signals and a constant 48V DC power supply to an RJ45 port via a POE switch. The POE power is fed to a DC-DC switching power supply unit, which converts it to DC power for the digital amplifier. Another unit converts the power to 5V DC to power the network transceiver and decoder, the preamplifier unit, and the SPWM duty cycle adjustment device. The network signal is transmitted to the network transceiver and decoder via the network, where it is decoded to produce an audio signal. This signal is then fed into a preamplifier circuit, which then feeds the amplified audio signal into the digital amplifier for audio power amplification. Finally, the fixed-resistance speaker outputs the audio power signal.

[0120] In this embodiment, during the audio power amplification process, the primary current is detected cycle by cycle by the primary current detection unit. When the primary current effective protection threshold increases, the output voltage is reduced to maintain constant device power consumption, thereby ensuring that the device power consumption remains constant and does not exceed the POE protection threshold, triggering a POE power supply device protection lock. Simultaneously, an SPWM duty cycle adjustment device detects the SPWM duty cycle of the digital power amplifier device in real time. The SPWM duty cycle adjustment device includes an SPWM duty cycle detection device and, when detecting an increase in the SPWM duty cycle, outputs a DC signal to control the audio signal amplitude adjustment unit to reduce the amplifier gain, thereby reducing the input audio signal amplitude, thereby reducing the amplifier output voltage, maintaining a constant amplifier output power, and ultimately maintaining constant device power consumption.

[0121] In this embodiment, cycle-by-cycle current limiting ensures that power supply voltage reduction during power overload does not trigger POE power supply protection. When the power supply voltage decreases, SPWM pulse width limiting is triggered, reducing the amplitude of the preamplifier signal and, consequently, the amplifier output, while also ensuring that the amplifier output does not experience clipping distortion. The result is a standard POE-powered audio power amplifier with closed-loop automatic gain control, encompassing the power supply and power amplifier. This prevents clipping distortion and maintains overall power consumption within the power protection threshold of the POE device.

[0122] The specific embodiments described above further illustrate the objectives, technical solutions, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of protection of the present invention for those skilled in the art.

Claims

1. A POE powered audio power amplification method, characterized in that: include: Acquire a first audio signal and perform power amplification processing on the first audio signal; wherein, during the power amplification process, control the input voltage of a circuit used for audio power amplification so that the power consumption of the circuit does not exceed a first set threshold; and detect the SPWM duty cycle of the audio signal after power amplification in real time; specifically, set a current protection threshold and a current sampling period, and sample and detect the current on a cycle-by-cycle basis according to the current sampling period; when it is detected that the current exceeds the protection threshold, reduce the duty cycle of the PWM signal of the power supply used to power the audio power amplification circuit to reduce the input voltage of the audio amplification circuit, thereby regulating the power consumption of the circuit to not exceed the first set threshold; When it is detected that the SPWM duty cycle exceeds a second set threshold, reducing the power amplifier gain in the audio power amplification process to reduce the audio amplitude; When the power amplification of the first audio signals is completed, the second audio signal is output.

2. The POE-powered audio power amplification method according to claim 1, wherein: When it is detected that the SPWM duty cycle exceeds the second set threshold, the power amplifier gain in the audio power amplification process is reduced to reduce the audio amplitude, specifically: Perform SPWM sampling on the power-amplified audio signal in real time; When it is detected that the SPWM duty cycle exceeds the second set threshold, a DC signal is output to reduce the power amplifier gain used for audio power amplification to reduce the audio signal adjustment amplitude, thereby adjusting the power amplifier output power of the audio amplifier power circuit to not exceed the third set threshold.

3. The POE-powered audio power amplification method according to claim 1, wherein: The acquiring the first audio signal and performing power amplification processing on the first audio signal specifically comprises: Acquire a network signal through network transmission, and decode the network signal into a first audio signal; And according to the preset preamplification gain and power amplifier gain, the first audio signal is subjected to audio power amplification processing.

4. A POE powered audio power amplifier device, characterized in that: include: Audio power amplifier module, audio amplitude modulation module and audio signal output module; The audio power amplification module is configured to obtain a first audio signal and perform power amplification processing on the first audio signal; wherein, during the power amplification process, the input voltage of the circuit used for audio power amplification is controlled so that the power consumption of the circuit does not exceed a first set threshold value; and the SPWM duty cycle of the audio signal after power amplification is detected in real time; specifically, a current protection threshold and a current sampling period are set, and the current is sampled and detected on a cycle-by-cycle basis according to the current sampling period; when it is detected that the current exceeds the protection threshold, the duty cycle of the PWM signal of the power supply for the audio power amplification circuit is reduced to reduce the input voltage of the audio amplification circuit, thereby regulating the power consumption of the circuit to not exceed the first set threshold value; The audio amplitude modulation module is configured to reduce the power amplifier gain during the audio power amplification process to reduce the audio amplitude when detecting that the SPWM duty cycle exceeds a second set threshold; The audio signal output module is configured to output a second audio signal after the first audio signals have completed power amplification.

5. The POE-powered audio power amplifier device according to claim 4, characterized in that: The audio amplitude modulation module is specifically used for: Perform SPWM sampling on the power-amplified audio signal in real time; When it is detected that the SPWM duty cycle exceeds the second set threshold, a DC signal is output to reduce the power amplifier gain used for audio power amplification to reduce the audio signal adjustment amplitude, thereby adjusting the power amplifier output power of the audio amplifier power circuit to not exceed the third set threshold.

6. The POE-powered audio power amplifier device according to claim 4, characterized in that: The audio power amplification module is further used for: Acquire a network signal through network transmission, and decode the network signal into a first audio signal; The first audio signal is subjected to audio power amplification processing according to a preset preamplification gain and a power amplifier gain.

7. A computer device, characterized in that: include: A processor, a communication interface and a memory, wherein the processor, the communication interface and the memory are interconnected, wherein the memory stores an executable program code, and the processor is used to call the executable program code to execute the POE-powered audio power amplification method as described in any one of claims 1 to 3.

8. A computer-readable storage medium having computer instructions stored thereon, wherein when the computer instructions are executed by a processor, the POE-powered audio power amplification method according to any one of claims 1 to 3 is implemented.

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