A method and device for detecting power amplifier status

Abstract

The present invention discloses a method and device for detecting the state of an amplifier, wherein the method comprises: after acquiring an audio amplifier signal of a first circuit, sending the signal to a first load, and driving the first load to enter a working state. When the first load is disconnected, the power amplifier output can also output a voltage signal. Based on this, the audio amplifier signal is rectified to generate a corresponding first detection signal. The power amplifier state of the first circuit can be determined by comparing the detection signal with the current signal and voltage information of the first circuit. Even when the first load is disconnected, the power amplifier state of the first circuit can be determined by the detection signal, which overcomes the defect in the prior art that it is impossible to detect in both the working and closed states of the circuit. The working state of the load disconnection can be captured, thereby improving the accuracy of the power amplifier state detection.

Description

Technical Field

[0001] The present invention relates to the technical field of power amplifier detection, and in particular to a power amplifier state detection method and device. Background Art

[0002] The output line of the audio power amplifier (abbreviated as power amplifier) ​​may sometimes have faults such as artificial or unintentional short circuit, grid connection, or being broken by strong wind, or speaker damage. The power amplifier line detection in the prior art includes line detection and output power detection, wherein the output power detection is used to detect the load impedance or output power of the power amplifier in real time. Generally, the detection of the load impedance of the power amplifier line mostly adopts the method of detecting by direct current or detecting by high-frequency sinusoidal signal after turning off the power output, and the detection of the output power of the power amplifier mostly adopts the method of detecting by direct current after rectification.

[0003] In order to detect the state of the power amplifier load, the prior art usually adopts voltage-dividing sampling, using two large-value resistors for voltage division at the output end, and then sampling the load current of the power amplifier through current limiting and voltage stabilization. The power amplifier detection method in the prior art can only detect when the circuit is working or the circuit is closed, and cannot realize the detection in these two working states at the same time, and cannot detect the load impedance of the power amplifier in real time. When the power amplifier load is disconnected, the power amplifier output can also output voltage, but the voltage-dividing sampling only uses large-value resistors for voltage division at the output end, so it cannot capture the load disconnection state, and can only detect the normal and short-circuit states of the power amplifier load, and the detection state is missing. Summary of the invention

[0004] The present application provides a method and device for detecting a power amplifier status, which improves the accuracy of power amplifier status detection.

[0005] In a first aspect, the present application provides a method for detecting a power amplifier state, comprising: obtaining an audio power amplifier signal of a first circuit;

[0006] Sending the audio power amplifier signal to a first load, so that the audio power amplifier signal drives the first load to enter a working state;

[0007] Rectifying the audio power amplifier signal to generate a first detection signal;

[0008] comparing the first detection signal with a current signal of the first load;

[0009] The power amplification state of the first circuit is determined according to the comparison result.

[0010] In this way, different from the split-type power amplifier state detection method in the prior art that only uses the rectified power amplifier signal for detection or uses voltage-dividing sampling to detect the load impedance, the power amplifier state detection method provided by the present application obtains the audio power amplifier signal of the first circuit and sends it to the first load to drive the first load into the working state. Since the first load is disconnected, the power amplifier output can also output a voltage signal. Based on this, the audio power amplifier signal is rectified to generate a corresponding first detection signal. By comparing the generated first detection signal with the current signal and voltage information of the first circuit, the power amplifier state of the first circuit can be determined. Even when the first load is disconnected, the power amplifier state of the first circuit can be determined by detection, ensuring the integrity of the power amplifier state detection, and overcoming the defect in the prior art that it is impossible to detect in both the working and closed states of the circuit. The working state of the load disconnection can be captured, and the accuracy of the power amplifier state detection is improved.

[0011] In one implementation, the obtaining of the audio power amplifier signal of the first circuit specifically includes:

[0012] Acquire an audio input signal of the first circuit; perform a constant voltage power amplification on the audio input signal according to a preset voltage to generate the audio power amplifier signal; and acquire a power supply voltage value of the first circuit.

[0013] In this way, the audio input signal is amplified first, so that the weak signal in the audio input signal can be amplified, which is beneficial to improving the accuracy of subsequent power amplifier status detection.

[0014] In one implementation, rectifying the audio power amplifier signal to generate a first detection signal specifically includes:

[0015] The audio power amplifier signal is sampled to generate a first sampling signal; the first sampling signal is voltage-doubled and rectified to generate a first detection signal; and a first detection voltage and a first detection current are extracted according to the first detection signal.

[0016] In one implementation, comparing the first detection signal with the current and voltage information of the first circuit, and determining the power amplifier state of the first circuit according to the comparison result, specifically includes:

[0017] The rated current of the first load is generated according to the preset voltage and the power value of the constant voltage power amplifier; when the first detection voltage is equal to the power supply voltage of the first circuit, the first circuit is determined to be in a short-circuit state; when the first detection current is greater than the rated current of the first load, the first circuit is determined to be in an overload state; when the first detection current is less than the rated current of the first load, the first circuit is determined to be in a light-load state; when the first detection current is the rated current of the first circuit, the first circuit is determined to be in a normal working state; when the first detection current is 0, the first circuit is determined to be in an open circuit state.

[0018] In one implementation, the power amplifier status detection method further includes real-time monitoring of the playback status of the first load, specifically:

[0019] Acquire the play list of the first circuit; set a monitoring microphone to monitor the play status of the first load in real time; compare the play status of the first load with the play list of the first circuit.

[0020] In this way, the playback status of the first load can be remotely obtained through the sound pickup function of the monitoring microphone, so as to monitor the playback status of the load. If it is found that the playback status of the load is inconsistent with the playlist, corresponding processing measures can be taken in time.

[0021] In a second aspect, the present application also provides a power amplifier status detection device, including: an acquisition module, a processing module and a judgment module;

[0022] The acquisition module is used to acquire the audio power amplifier signal of the first circuit;

[0023] The processing module is used to send the audio power amplifier signal to the first load, so that the audio power amplifier signal drives the first load to enter a working state; rectify the audio power amplifier signal to generate a first detection signal;

[0024] The judgment module is used to compare the first detection signal with the current and voltage information of the first circuit; and determine the power amplifier state of the first circuit according to the comparison result.

[0025] In one implementation, the acquisition module is used to acquire the audio power amplifier signal of the first circuit, specifically including:

[0026] Acquire an audio input signal of the first circuit; perform a constant voltage power amplification on the audio input signal according to a preset voltage to generate the audio power amplifier signal; and acquire a power supply voltage value of the first circuit.

[0027] In one implementation, the processing module performs rectification on the audio power amplifier signal to generate a first detection signal, specifically including:

[0028] The audio power amplifier signal is sampled to generate a first sampling signal; the first sampling signal is voltage-doubled and rectified to generate a first detection signal; and a first detection voltage and a first detection current are extracted according to the first detection signal.

[0029] In one implementation, the judgment module is used to compare the first detection signal with the current and voltage information of the first circuit; and determine the power amplifier state of the first circuit according to the comparison result, specifically including:

[0030] The rated current of the first load is generated according to the preset voltage and the power value of the constant voltage power amplifier; when the first detection voltage is equal to the power supply voltage of the first circuit, the first circuit is determined to be in a short-circuit state; when the first detection current is greater than the rated current of the first load, the first circuit is determined to be in an overload state; when the first detection current is less than the rated current of the first load, the first circuit is determined to be in a light-load state; when the first detection current is the rated current of the first circuit, the first circuit is determined to be in a normal working state; when the first detection current is 0, the first circuit is determined to be in an open circuit state.

[0031] In one implementation, the power amplifier status detection device further includes a monitoring module for real-time monitoring of the playback status of the first load, specifically:

[0032] Acquire the play list of the first circuit; set a monitoring microphone to monitor the play status of the first load in real time; compare the play status of the first load with the play list of the first circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a flow chart of a method for detecting a power amplifier state provided by an embodiment of the present invention;

[0034] Figure 2 It is a module structure diagram of a power amplifier status detection device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0035] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0036] The terms "first" and "second" and the like in the specification and claims of the present application and the drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0037] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0038] First, some terms in this application are explained to facilitate understanding by those skilled in the art.

[0039] (1) Hall current sensor: The Hall current sensor is based on the magnetic balance Hall principle. According to the Hall effect principle, when the current Ic is passed through the control current end of the Hall element and a magnetic field with a magnetic induction intensity of B is applied in the normal direction of the Hall element plane, an electric potential VH will be generated perpendicular to the current and magnetic field direction (i.e., between the Hall output ends). This is called the Hall potential, and its magnitude is proportional to the product of the control current I and the magnetic induction intensity B. Since the magnetic circuit has a good linear relationship with the output of the Hall device, the potential signal output by the Hall device can indirectly reflect the magnitude of the measured current Ic.

[0040] (2) Output power: Indicates the output power of the power amplifier under a certain load. Generally, the output power under 8 ohm load, 4 ohm load or 2 ohm load is indicated on the power amplifier manual. It also indicates the output power of the power amplifier under bridge connection, 8 ohm load or 4 ohm load. This output power indicates the rated output power of the power amplifier, not the maximum or peak output power.

[0041] (3) Load impedance: This indicates the load capacity of the power amplifier. The smaller the load impedance, the greater the current capacity of the power amplifier. Generally speaking, the minimum load impedance of most power amplifiers is 4 ohms, and the minimum load of a good quality power amplifier is generally 2 ohms.

[0042] Example 1

[0043] See also Figure 1 , Figure 1 1 is a flow chart of a method for detecting a power amplifier state provided by an embodiment of the present invention. The present invention provides a method for detecting a power amplifier state, including steps 101 to 105, each of which is as follows:

[0044] Step 101: obtaining an audio power amplifier signal of a first circuit;

[0045] Step 102: Sending the audio power amplifier signal to a first load, so that the audio power amplifier signal drives the first load to enter a working state;

[0046] Step 103: rectifying the audio power amplifier signal to generate a first detection signal;

[0047] Step 104: comparing the first detection signal with the current and voltage information of the first circuit;

[0048] Step 105: Determine the power amplification state of the first circuit according to the comparison result.

[0049] In an embodiment of the present invention, the audio input signal refers to a voltage signal whose amplitude changes over time according to the law of sound. Constant voltage amplifier does not mean that the voltage is constant, but that the output form is constant voltage, which requires that the rated voltage of the first load is constant. In a constant voltage amplifier, if the rated load voltage changes, the power changes accordingly. Obtaining the audio power amplifier signal of the first circuit specifically includes: obtaining the audio input signal of the first circuit; performing constant voltage power amplification on the audio input signal according to a preset voltage to generate an audio power amplifier signal; obtaining the power supply voltage of the first circuit.

[0050] In a specific embodiment, according to the amplitude of the audio input signal, a corresponding voltage is selected to perform a constant voltage amplification on the audio signal to generate an audio power amplifier signal. At the same time, the power supply voltage value of the first circuit is obtained. Among them, the audio power amplifier signal is actually the output power, and the output power refers to the power delivered by the power amplifier to the first load, which is determined by the size of the input audio input signal. The first load is a device connected after the power amplifier output, which can be a speaker, a speaker, or other devices.

[0051] In a specific embodiment, a Hall current sensor is introduced to send an audio power amplifier signal to the first load, so that the audio power amplifier signal drives the first load to enter a working state. The generated audio power amplifier signal is connected to the input end of the Hall current sensor, and the audio power amplifier signal is input to the Hall current sensor. The output end of the Hall current sensor is connected to the first load, and the audio power amplifier signal is sent to the first load to drive the first load to work normally.

[0052] In an embodiment of the present invention, rectifying the audio power amplifier signal to generate a first detection signal specifically includes: sampling the audio power amplifier signal to generate a first sampling signal; performing voltage doubling rectification on the first sampling signal to generate a first detection signal; and extracting a first detection voltage and a first detection current according to the first detection signal.

[0053] In a specific embodiment, the audio power amplifier signal is connected to the input end of the Hall current sensor, and the current signal of the audio power amplifier signal is sampled. The filter pin of the Hall current sensor performs ground filtering on the audio power amplifier signal. Specifically, a capacitor is connected to the filter pin and the capacitor is grounded. The high-frequency signal and the clutter signal in the audio power amplifier signal are filtered out by the direct current isolation and alternating current passing characteristics of the capacitor. According to the Hall effect, the Hall current sensor generates a magnetic field proportional to the current around the current-carrying conductor inside the Hall current sensor, and measures the magnitude of the magnetic field. The detection output end of the Hall current sensor outputs a voltage signal corresponding to the current signal, that is, the first sampling signal. The sampling signal is doubled and rectified to generate the corresponding first detection signal, and the voltage value and current value of the first detection signal are measured. Utilizing the rectification and unidirectional conduction of the diode, a rectifier diode and a capacitor with a higher withstand voltage are used to store the voltage on the capacitor, and an output voltage signal higher than the input voltage is output, that is, the first detection signal. Since the voltage doubler rectifier circuit is a common circuit in this field, the circuit structure is not limited and elaborated here.

[0054] In an embodiment of the present invention, the first detection signal is compared with the current and voltage information of the first circuit, and the power amplifier state of the first circuit is determined according to the comparison result, specifically including: generating the rated current of the first load according to the preset voltage and the power value of the constant voltage power amplifier. When the first detection voltage is equal to the power supply voltage of the first circuit, the first circuit is determined to be in a short-circuit state; when the first detection current is greater than the rated current of the first load, the first circuit is determined to be in a state; when the first detection current is less than the rated current of the first load, the first circuit is determined to be in a light-load state; when the first detection current is the rated current of the first circuit, the first circuit is determined to be in a normal working state; when the first detection current is 0, the first circuit is determined to be in an open circuit state.

[0055] The rated current of the first load is generated according to the formula P=UI, wherein P is the audio power amplifier signal, i.e., the output power, U is the voltage of the first load, and I is the rated current of the first load. In a specific embodiment, when the first load is connected to the disconnected circuit, it is equivalent to directly collecting the power supply voltage of the first circuit. At this time, the first detection voltage is equal to the power supply voltage of the first circuit, and the circuit is judged to be in a short-circuit state; when the negative first load is too small due to the wrong load connection or the first load wiring error, the collected first detection current is greater than the rated current, and the first circuit is determined to be in an overload state; when the negative first load is too large due to the wrong load connection or the first load wiring error, the collected first detection current is less than the rated current, and the first circuit is determined to be in a light-load state; when the load is connected normally, the collected first detection current is the rated current, and the first circuit is determined to be in a normal working state at this time; when the first load is disconnected, the first circuit cannot form a complete loop, and there is basically no current passing through the circuit, i.e., the first detection current is 0, and the first circuit is determined to be in a disconnected state at this time.

[0056] As a preferred amplifier scheme of an embodiment of the present invention, an amplifier status detection method provided by an embodiment of the present invention also includes real-time monitoring of the playback status of the first load, specifically: obtaining a play list of the first circuit; setting a monitoring microphone to monitor the playback status of the first load in real time; and comparing the playback status of the first load with the play list of the first circuit.

[0057] In a specific embodiment, the monitoring microphone is set within the playback radiation range of the first load, and the playback status of the first load can be remotely obtained through the sound pickup function of the monitoring microphone, so as to realize the monitoring of the playback status of the load. If it is found that the playback status of the load is inconsistent with the playlist, corresponding processing measures can be taken in time.

[0058] The embodiment of the present invention provides a power amplifier state detection method, which is different from the split power amplifier state detection method in the prior art that only uses the rectified power amplifier signal for detection or uses voltage-dividing sampling to detect the load impedance. The power amplifier state detection method provided by the present application sends the audio power amplifier signal of the first circuit to the first load after obtaining it, and drives the first load to enter the working state. Since the first load is disconnected, the power amplifier output can also output a voltage signal. Based on this, the audio power amplifier signal is rectified to generate a corresponding first detection signal. By comparing the generated first detection signal with the current signal and voltage information of the first circuit, the power amplifier state of the first circuit can be determined. Even when the first load is disconnected, the power amplifier state of the first circuit can be determined by detection, ensuring the integrity of the power amplifier state detection, and overcoming the defect in the prior art that it is impossible to detect in both the working and closed states of the circuit. The working state of the load disconnection can be captured, and the accuracy of the power amplifier state detection is improved.

[0059] Example 2

[0060] Figure 2 201 is a module structure diagram of a power amplifier state detection device provided by an embodiment of the present invention. The present invention provides a power amplifier state detection device, including an acquisition module 201, a processing module 202 and a judgment module 203;

[0061] The acquisition module 201 is used to acquire the audio power amplifier signal of the first circuit;

[0062] The processing module 202 is used to send the audio power amplifier signal to the first load so that the audio power amplifier signal drives the first load to enter a working state; rectify the audio power amplifier signal to generate a first detection signal;

[0063] The judgment module 203 is used to compare the first detection signal with the current and voltage information of the first circuit; and determine the power amplifier state of the first circuit according to the comparison result.

[0064] In the embodiment of the present invention, the audio input signal refers to a voltage signal whose amplitude changes over time according to the law of sound. A constant voltage amplifier does not mean that the voltage is constant, but that the output form is constant voltage, which requires that the rated voltage of the first load is constant. In a constant voltage amplifier, if the rated load voltage changes, the power changes accordingly.

[0065] The acquisition module 201 is used to acquire the audio power amplifier signal of the first circuit, specifically including: acquiring the audio input signal of the first circuit; performing constant voltage power amplification on the audio input signal according to a preset voltage to generate an audio power amplifier signal; and acquiring the power supply voltage value of the first circuit.

[0066] In a specific embodiment, according to the amplitude of the audio input signal, a corresponding voltage is selected to perform a constant voltage amplification on the audio signal to generate an audio power amplifier signal. At the same time, the power supply voltage value of the first circuit is obtained. Among them, the audio power amplifier signal is actually the output power, and the output power refers to the power delivered by the power amplifier to the first load, which is determined by the size of the input audio input signal. The first load is a device connected after the power amplifier output, which can be a speaker, a speaker, or other devices.

[0067] In an embodiment of the present invention, the processing module 202 is used to send an audio power amplifier signal to a first load so that the audio power amplifier signal drives the first load to enter a working state; rectify the audio power amplifier signal to generate a first detection signal, specifically including: sampling the audio power amplifier signal to generate a first sampling signal; doubling the voltage and rectifying the first sampling signal to generate a first detection signal; and extracting a first detection voltage and a first detection current according to the first detection signal.

[0068] In a specific embodiment, a Hall current sensor is introduced to send an audio power amplifier signal to a first load so that the audio power amplifier signal drives the first load to enter a working state. The generated audio power amplifier signal is connected to the input end of the Hall current sensor, and the audio power amplifier signal is input to the Hall current sensor. The output end of the Hall current sensor is connected to the first load, and the audio power amplifier signal is sent to the first load to drive the first load to work normally. The audio power amplifier signal is connected to the input end of the Hall current sensor, and the current signal of the audio power amplifier signal is sampled. The filter pin of the Hall current sensor performs ground filtering on the audio power amplifier signal. Specifically, a capacitor is connected to the filter pin and the capacitor is grounded. The high-frequency signal and the clutter signal in the audio power amplifier signal are filtered out by the direct current isolation and alternating current passing characteristics of the capacitor. According to the Hall effect, the Hall current sensor generates a magnetic field proportional to the current around the current-carrying conductor inside the Hall current sensor, and measures the magnitude of the magnetic field. The detection output end of the Hall current sensor outputs a voltage signal corresponding to the current signal, that is, a first sampling signal. The sampling signal is voltage-doubled and rectified to generate a corresponding first detection signal, and the voltage value and current value of the first detection signal are measured. By utilizing the rectifying and unidirectional conduction function of the diode, a rectifier diode with a higher withstand voltage and a capacitor are used to store the voltage on the capacitor, and an output voltage signal higher than the input voltage is output, i.e., the first detection signal. Since the voltage doubling rectifier circuit is a common circuit in the art, the circuit structure is not limited and described here.

[0069] In an embodiment of the present invention, the judgment module 203 is used to compare the first detection signal with the current and voltage information of the first circuit; determine the power amplifier state of the first circuit according to the comparison result, specifically including: generating the rated current of the first load according to the preset voltage and the power value of the constant voltage power amplifier. When the first detection voltage is equal to the power supply voltage of the first circuit, determine that the first circuit is in a short-circuit state; when the first detection current is greater than the rated current of the first load, determine that the first circuit is in a state; when the first detection current is less than the rated current of the first load, determine that the first circuit is in a light-load state; when the first detection current is the rated current of the first circuit, determine that the first circuit is in a normal working state; when the first detection current is 0, determine that the first circuit is in an open circuit state.

[0070] In a specific embodiment, the rated current of the first load is generated according to the formula P=UI, wherein P is the audio power amplifier signal, i.e., the output power, U is the voltage of the first load, and I is the rated current of the first load. In a specific embodiment, when the first load is connected to the disconnected circuit, it is equivalent to directly collecting the power supply voltage of the first circuit. At this time, the first detection voltage is equal to the power supply voltage of the first circuit, and the circuit is judged to be in a short-circuit state; when the negative first load is too small due to the wrong load connection or the first load wiring error, the collected first detection current is greater than the rated current, and the first circuit is determined to be in an overload state; when the negative first load is too large due to the wrong load connection or the first load wiring error, the collected first detection current is less than the rated current, and the first circuit is determined to be in a light load state; when the load is connected normally, the collected first detection current is the rated current, and the first circuit is determined to be in a normal working state at this time; when the first load is disconnected, the first circuit cannot form a complete loop, and there is basically no current passing through the circuit, i.e., the first detection current is 0, and the first circuit is determined to be in a disconnected state at this time.

[0071] As a preferred solution of an embodiment of the present invention, an amplifier status detection device provided by an embodiment of the present invention also includes a monitoring module to monitor the playback status of the first load in real time, specifically: obtaining a play list of the first circuit; setting a monitoring microphone to monitor the playback status of the first load in real time; and comparing the playback status of the first load with the play list of the first circuit.

[0072] In a specific embodiment, the monitoring microphone is set within the playback radiation range of the first load, and the playback status of the first load can be remotely obtained through the sound pickup function of the monitoring microphone, so as to realize the monitoring of the playback status of the load. If it is found that the playback status of the load is inconsistent with the playlist, corresponding processing measures can be taken in time.

[0073] The embodiment of the present invention provides a power amplifier state detection device. Different from the split power amplifier state detection method in the prior art that only uses the rectified power amplifier signal for detection or uses voltage-dividing sampling to detect the load impedance, the power amplifier state detection device provided by the present application is provided with a processing module, which sends the audio power amplifier signal of the first circuit to the first load after obtaining it, and drives the first load to enter the working state. When the first load is disconnected, the power amplifier output can also output a voltage signal. Based on this, the audio power amplifier signal is rectified to generate a corresponding first detection signal. By comparing the generated first detection signal with the current signal and voltage information of the first circuit, the power amplifier state of the first circuit can be determined. Even when the first load is disconnected, the power amplifier state of the first circuit can be determined by detection, ensuring the integrity of the power amplifier state detection, and overcoming the defect in the prior art that the circuit cannot be detected in both the working and closed states at the same time. The working state of the load disconnection can be captured, and the accuracy of the power amplifier state detection is improved.

[0074] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A method for detecting a power amplifier state, characterized in that: include: Acquire an audio power amplifier signal of the first circuit; wherein, acquire an audio input signal of the first circuit; perform a constant voltage power amplification on the audio input signal according to a preset voltage to generate the audio power amplifier signal; acquire a power supply voltage value of the first circuit; Sending the audio power amplifier signal to a first load, so that the audio power amplifier signal drives the first load to enter a working state; The audio power amplifier signal is rectified to generate a first detection signal; wherein the audio power amplifier signal is sampled to generate a first sampling signal; the first sampling signal is voltage-doubled and rectified to generate a first detection signal; a first detection voltage and a first detection current are extracted according to the first detection signal; comparing the first detection signal with the current and voltage information of the first circuit; The power amplification state of the first circuit is determined according to the comparison result.

2. A method for detecting a power amplifier state as claimed in claim 1, characterized in that: The comparing the first detection signal with the current and voltage information of the first circuit, and determining the power amplifier state of the first circuit according to the comparison result, specifically includes: generating a rated current of the first load according to the preset voltage and the power value of the constant voltage power amplifier; When the first detection voltage is equal to the power supply voltage of the first circuit, determining that the first circuit is in a short circuit state; When the first detection current is greater than the rated current of the first load, determining that the first circuit is in an overload state; When the first detection current is less than the rated current of the first load, determining that the first circuit is in a light load state; When the first detection current is the rated current of the first circuit, determining that the first circuit is in a normal working state; When the first detection current is 0, it is determined that the first circuit is in an open circuit state.

3. A method for detecting a power amplifier state as claimed in claim 1, characterized in that: The method further includes real-time monitoring of the playing status of the first load, specifically: Obtaining a playlist of the first circuit; Setting a monitoring microphone to monitor the playing status of the first load in real time; The play status of the first load is compared with the play list of the first circuit.

4. A power amplifier status detection device, characterized in that: include: Acquisition module, processing module and judgment module; The acquisition module is used to acquire the audio power amplifier signal of the first circuit; wherein, the audio input signal of the first circuit is acquired; the audio input signal is amplified at a constant voltage according to a preset voltage to generate the audio power amplifier signal; and the power supply voltage value of the first circuit is acquired; The processing module is used to send the audio power amplifier signal to the first load so that the audio power amplifier signal drives the first load to enter a working state; rectify the audio power amplifier signal to generate a first detection signal; wherein the audio power amplifier signal is sampled to generate a first sampling signal; the first sampling signal is voltage-doubled and rectified to generate a first detection signal; and a first detection voltage and a first detection current are extracted according to the first detection signal; The judgment module is used to compare the first detection signal with the current and voltage information of the first circuit; and determine the power amplifier state of the first circuit according to the comparison result.

5. A power amplifier status detection device as claimed in claim 4, characterized in that: The judgment module is used to compare the first detection signal with the current and voltage information of the first circuit; Determining the power amplifier state of the first circuit according to the comparison result specifically includes: generating a rated current of the first load according to the preset voltage and the power value of the constant voltage power amplifier; When the first detection voltage is equal to the power supply voltage of the first circuit, determining that the first circuit is in a short circuit state; When the first detection current is greater than the rated current of the first load, determining that the first circuit is in an overload state; When the first detection current is less than the rated current of the first load, determining that the first circuit is in a light load state; When the first detection current is the rated current of the first circuit, determining that the first circuit is in a normal working state; When the first detection current is 0, it is determined that the first circuit is in an open circuit state.

6. A power amplifier status detection device as claimed in claim 4, characterized in that: It also includes a monitoring module for real-time monitoring of the playing status of the first load, specifically: Obtaining a playlist of the first circuit; Setting a monitoring microphone to monitor the playing status of the first load in real time; The play status of the first load is compared with the play list of the first circuit.

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