Audio amplifier circuit safety protection method and system

Abstract

The invention relates to the technical field of audio amplifiers, in particular to an audio amplifier circuit safety protection method and system.The circuit safety protection method and system comprise the steps that an audio input source and system power-on are included, and after the audio input source receives audio, the audio is transmitted to an audio power amplification module; the audio power amplification module amplifies the audio power and then the audio power passes through the over-current detection module. According to the audio amplifier circuit safety protection method and system, an integrated and intelligent audio amplifier safety protection solution is provided, and compared with a traditional scheme only adopting a disposable fuse, the audio amplifier circuit safety protection method and system have the double functions of over-temperature protection and over-current protection, can cope with more comprehensive fault scenes, are more comprehensive in protection, and are more reliable in protection. An electronic circuit is adopted for real-time monitoring, the response speed reaches the millisecond level and is far higher than that of a traditional fuse, faults can be cut off rapidly, and expensive core power devices are prevented from being burnt out fundamentally.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of audio amplifier, in particular to a kind of audio amplifier circuit safety protection method and system. BACKGROUND

[0002] Audio amplifier is the core equipment in electronic sound system, and its basic task is to amplify the weak electrical signal from the sound source without distortion, which can be mobile phone, computer, microphone or music player, and the signal voltage and power provided are too small to directly drive loudspeaker to emit loud sound. The amplifier first increases the voltage amplitude of signal through voltage amplification stage, and then the key power amplification stage increases the voltage and current of signal simultaneously, finally outputs enough electric power to push the voice coil of loudspeaker to vibrate. A high-quality amplifier not only pursues the improvement of power, but also is committed to maintaining the original fidelity of signal. This means that it needs to minimize the noise and distortion introduced in the amplification process. Engineers need to carefully design the circuit to overcome various nonlinear distortion and frequency response unevenness and other problems. The performance of the amplifier directly determines the sound quality performance, output volume and sound clarity and dynamic range of the entire sound system. Therefore, from home audio to professional performance equipment, audio amplifier is an indispensable key component, and is called the power heart of the entire system.

[0003] However, in the actual use process of the existing audio amplifier, especially in the high-power output state, the core power device will pass through a large current and generate a large amount of heat. Poor heat dissipation or abnormal load will cause the working current of the power amplifier tube to increase sharply, and the temperature to rise rapidly. The existing ordinary audio amplifier often lacks effective protection measures, or the protection method is single. The fuse is a disposable component, the reaction speed is slow, and it cannot provide effective protection in the critical state, which easily leads to permanent damage of expensive power devices due to overcurrent or overtemperature, reduces the reliability and service life of the product. SUMMARY

[0004] The purpose of the present application is to provide an audio amplifier circuit safety protection method and system to solve the problem of lack of circuit safety protection in the high-power output state in the background art.

[0005] To achieve the above purpose, the present application provides the following technical scheme: an audio amplifier circuit safety protection method and system, comprising: The circuit safety protection method and system comprises an audio input source and system power, after the audio input source receives audio, the audio is transmitted to an audio power amplifier module, the audio power amplifier module amplifies the audio power, the audio power is detected by an overcurrent detection module, the overcurrent detection module is detected by an overtemperature detection module, the overtemperature detection module is detected by a control module, the control module controls the power supply to the control end, and the control module supplies normal power to the loudspeaker.

[0006] Preferably, after the system is powered on, the audio passes through the audio power amplifier module, the audio power detection state after the audio power amplifier module, when the detection state is overtemperature and overcurrent, the audio is transmitted to the audio power amplifier module for re-amplification after the five-second timer, and the normal audio signal is amplified normally.

[0007] Preferably, the audio input source is an audio input entrance, and the audio power amplifier module can amplify the power of the audio.

[0008] Preferably, the overcurrent detection module can detect whether the current flowing through the loudspeaker is too large.

[0009] Preferably, the overtemperature detection module can detect the temperature of the power device, and the control module can judge whether the current is overtemperature and overcurrent.

[0010] Preferably, the control end can directly control the audio input source, and the loudspeaker can make sound.

[0011] Preferably, after the system is powered on, the audio amplifier can work normally, and the delay timer can temporarily stop the power supply.

[0012] Compared with the prior art, the beneficial effects of the present application are: The audio amplifier circuit safety protection method and system provides an integrated and intelligent audio amplifier safety protection solution, which has overtemperature protection and overcurrent protection functions compared with the traditional solution using only a one-time fuse, can cope with more comprehensive fault scenarios, and is more comprehensive in protection. The electronic circuit is used for real-time monitoring, the response speed reaches milliseconds, far exceeds the traditional fuse, can quickly cut off the fault, fundamentally prevents the burning of expensive core power devices, and has a delay automatic recovery capability. After triggering protection, the system is not permanently closed, but automatically tries to restart after a predetermined safety delay, and if the fault disappears, it returns to normal work, and if the fault still exists, it is protected again. This feature completely avoids the trouble of manual intervention for maintenance after troubleshooting, greatly improves the ease of use and continuous working ability of the device, and significantly improves the reliability, durability and user experience of the audio amplifier at a low cost. BRIEF DESCRIPTION OF DRAWINGS

[0013] Fig. 1 is a system overall structure block diagram of the present application; Fig. 2 is a logic judgment flow chart of the control module of the present application. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0015] Please refer to Figs. 1-2 The present application provides an embodiment of a kind of audio amplifier circuit safety protection method and system.

[0016] The circuit safety protection method and system include an audio input source and system power-on. The audio input source is the signal starting point of the entire sound system, providing the original audio electrical signal that needs to be amplified for the amplifier. These signals can come from various daily devices, such as smartphones, laptops, televisions, microphones, or traditional music players. The output signals from the input source are usually low in voltage and weak in driving ability, and cannot directly drive the speaker to produce loud enough sound. Therefore, the primary task of the amplifier is to faithfully and efficiently process these fragile signals from the input source to lay the foundation for subsequent power amplification. The quality of the input signal directly determines the potential of the final sound effect. After receiving the audio, the audio input source transmits the audio to the audio power amplification module, which is the power core and executive mechanism of the entire sound system. It is responsible for receiving the audio voltage signal from the previous stage circuit and performing power-level amplification. This process not only significantly increases the voltage amplitude of the signal but also significantly enhances its current output capability, ultimately converting it into sufficient electrical power. This signal with strong driving ability is directly delivered to the speaker voice coil, effectively driving the diaphragm to vibrate the air and produce loud and clear sound. The performance of the module directly determines the final output sound quality, volume, and stability of the system, which are key factors affecting the listening experience. After power amplification by the audio power amplification module, the signal passes through the overcurrent detection module, which is the safety guard of the audio amplifier system. It is precisely connected in the output loop between the power amplification module and the speaker. Its core task is to continuously monitor the current flowing through the speaker in real time. Inside the module, a small sampling resistor converts the current value into a corresponding voltage signal for comparison and analysis. Once the current instantaneously surges or continuously exceeds the preset safety threshold, it is immediately determined as an overcurrent fault and quickly sends an explicit alarm signal to the control module. This fast response mechanism is the first solid defense line to prevent expensive power devices from being damaged by short circuits or overloads. After detection by the overcurrent detection module, the signal passes through the overtemperature detection module, which is the temperature monitor of the audio amplifier system. It is usually composed of a thermosensitive sensor and is closely installed on the surface of the power amplifier chip or its heat sink to accurately perceive temperature changes. When the temperature of the power device rises sharply due to long-term high-load work or poor heat dissipation and exceeds the safety threshold, the module immediately sends an overtemperature alarm signal to the control center. This mechanism effectively prevents permanent damage to the device caused by overheating, which is an important part of ensuring the long-term stable operation of the system. After completion of detection by the overtemperature detection module, the signal passes through the control module, which is the intelligent decision-making center of the entire protection system. Like the brain, it continuously receives real-time status signals from the overcurrent detection and overtemperature detection modules. The internal preset logic program analyzes and judges these signals quickly.Once the current or temperature any parameter beyond the safety range module will not hesitate to immediately shut down the power amplifier module to stop working so as to achieve instantaneous protection, after the shutdown module will start the built-in delay timing program to wait for a predetermined safety interval and then automatically attempt to restore power, if the fault is still the cycle of this protection process until the system returns to normal, the control module to the normal power delivery to the control end, the control end is the system for receiving instructions and control function interface or terminal, can be a physical button, virtual keys on the touch screen or from a remote device signal receiving point, the user or automatic system through the control end to the device sends start, stop, mode switching or parameter adjustment commands, the control end will receive the instructions into electrical signals to the core processing unit to achieve accurate management of the device state, its design is directly related to the convenience of human-computer interaction and the reliability of the system operation is the user and the complex equipment between the establishment of the direct bridge, the control module will normal power to the speaker, the speaker is a kind of electric sound transducer, which converts electrical energy into sound energy, as the terminal device of the sound system, receives audio electrical signal from the power amplifier, the signal flow through the speaker inside the voice coil will produce changing magnetic field, the magnetic field and the permanent magnet interact, drive voice coil and the connected diaphragm for high speed reciprocating vibration, diaphragm with push surrounding air molecules density changes, thus accurately reproduce the original electrical signal corresponding to the sound waveform, the design and performance of the speaker directly determines the final sound quality, frequency response and dynamic range, is the key link of electronic signal restoration to audible sound.

[0017] Preferably, the system is powered on audio through the audio power amplifier module, the audio power amplifier module is the power core and the execution mechanism of the whole audio system, which is responsible for receiving the audio voltage signal from the previous circuit and amplifying it to the power level. This process not only significantly improves the voltage amplitude of the signal, but more importantly, it greatly enhances its current output capability and ultimately converts it into sufficient electric power. This signal with strong driving capability is directly delivered to the speaker voice coil to effectively push the diaphragm to vibrate the air and emit loud and clear sound. The performance of this module directly determines the final output sound quality, volume and stability of the system, which is the key to listening experience. The audio power detection state after the audio power amplifier module, when the detection state is over temperature and over current, through the delay timer, the delay timer is a timing control unit in the protection system, which automatically starts after the amplifier is closed due to failure, and forces the system to enter a predetermined waiting period. This delay ensures that the power device has enough time to dissipate heat or let the instantaneous overcurrent state disappear. After the timing ends, the timer will trigger the system to try to automatically restore power supply, and if the fault still exists, it will be closed again and timed again, thus realizing the cycle protection until the fault is eliminated. This mechanism is the core of intelligent automatic recovery. The delay timer is timed for five seconds, and the audio is delivered to the audio power amplifier module again for amplification. The delay timer is a timing control unit in the protection system, which automatically starts after the amplifier is closed due to failure, and forces the system to enter a predetermined waiting period. This delay ensures that the power device has enough time to dissipate heat or let the instantaneous overcurrent state disappear. After the timing ends, the timer will trigger the system to try to automatically restore power supply, and if the fault still exists, it will be closed again and timed again, thus realizing the cycle protection until the fault is eliminated. This mechanism is the core of intelligent automatic recovery. The detection state of normal audio will normally amplify the audio signal. The audio amplifier is the heart of the audio system, responsible for significantly enhancing the weak electrical signal from the audio source device. Through multiple stages of amplification circuit, the voltage and current of the signal are gradually improved, and finally enough power is output to drive the speaker to emit loud and clear sound. A high-performance amplifier will try to maintain the original appearance of the signal during amplification, minimizing distortion and noise introduction. Its core indicators include output power, efficiency and fidelity. These characteristics together determine the sound quality performance and playback effect of the whole audio system, and are indispensable key components in modern audio equipment.

[0018] Preferably, the audio input source is the entrance of the audio input, and the audio input source is the signal starting point of the entire sound system, providing the original audio electrical signal to be amplified for the amplifier, which can come from various daily equipment such as smartphones, laptops, televisions, microphones or traditional music players. The signal output by the input source usually has low voltage and weak driving ability, and cannot directly drive the speaker to emit loud enough sound, so the primary task of the amplifier is to faithfully and efficiently process these fragile signals from the input source to lay the foundation for subsequent power amplification. The quality of the input signal directly determines the potential of the final sound effect. The audio power amplification module can amplify the power of the audio. The audio power amplification module is the power core and execution mechanism of the entire sound system, and is specially responsible for receiving the audio voltage signal from the previous circuit and amplifying the power level. This process not only significantly improves the voltage amplitude of the signal, but more importantly, significantly enhances its current output capability, which is finally converted into sufficient electric power. This signal with strong driving ability is directly delivered to the speaker voice coil to effectively push the diaphragm to vibrate the air and emit loud and clear sound. The performance of the module directly determines the final output sound quality, volume and stability of the system, which is the key factor affecting the listening experience.

[0019] Preferably, the overcurrent detection module can detect whether the current flowing through the speaker is too large. The overcurrent detection module is the safety guard of the audio amplifier system, which is precisely connected in series in the output loop between the power amplification module and the speaker. Its core task is to monitor the current flowing through the speaker in real time without stopping. Inside the module, a small sampling resistor converts the current value into a corresponding voltage signal for comparison and analysis. Once the current instantaneously surges or continuously exceeds the preset safety threshold, it will be immediately determined as an overcurrent fault and will quickly send an explicit alarm signal to the control module. This fast response mechanism is the first solid defense line to prevent expensive power devices from being burned out due to short circuit or overload.

[0020] Preferably, the over-temperature detection module can detect the temperature of the power device, and the over-temperature detection module is a temperature monitor of the audio amplifier system, which is usually composed of a thermosensitive sensor and is closely mounted on the surface of the power amplifier chip or its heat sink to accurately perceive the temperature change. The module continuously compares the detected temperature data with the preset safety threshold. When the temperature of the power device rises sharply due to long-time high-load work or poor heat dissipation and exceeds the safety threshold, the module immediately sends an over-temperature warning signal to the control center. This mechanism effectively prevents permanent damage of the device caused by overheating and is an important link to ensure the long-term stable operation of the system. The control module can determine whether the current is over-temperature and over-current. The control module is the intelligent decision center of the entire protection system, which continuously receives real-time state signals from the over-current detection and over-temperature detection modules like the brain. The internal preset logic program quickly analyzes and judges these signals. Once it is confirmed that any parameter of the current or temperature exceeds the safety range, the module will immediately send a shutdown instruction to the power amplifier module to stop working, thereby achieving instantaneous protection. After shutdown, the module will start the built-in delay timing program to wait for a preset safety interval and then automatically attempt to restore power supply. If the fault still exists, the protection process will be repeated until the system returns to normal.

[0021] Preferably, the control end can directly control the audio input source. The control end is an interface or terminal in the system for receiving instructions and performing control functions, which can be a physical button, a virtual key on a touch screen, or a signal receiving point from a remote device. Users or automatic systems send start, stop, mode switching, or parameter adjustment commands to the device through the control end. The control end converts the received instructions into electrical signals and transmits them to the core processing unit, thereby accurately managing the state of the device. The design of the control end is directly related to the convenience of human-computer interaction and the reliability of system operation, and it is a direct bridge between users and complex devices. The loudspeaker can produce sound. The loudspeaker is an electro-acoustic transducer that converts electrical energy into acoustic energy. As the terminal device of the sound system, it receives audio electrical signals from the power amplifier. When the signal flows through the voice coil inside the loudspeaker, a changing magnetic field is generated. This magnetic field interacts with the permanent magnet, driving the voice coil and the connected diaphragm to vibrate at high speed. The diaphragm pushes the surrounding air molecules to change in density, thereby accurately reproducing the original sound waveform corresponding to the electrical signal. The design and performance of the loudspeaker directly determine the sound quality, frequency response, and dynamic range of the final sound, and it is a key link in the restoration of electronic signals to audible sound.

[0022] Preferably, the audio amplifier can work normally after the system is powered on, the audio amplifier is the heart of the sound system, responsible for greatly enhancing the weak electrical signal from the audio source device, gradually improving the voltage and current of the signal through multiple stages of amplification circuit, and finally outputting sufficient power to drive the loudspeaker to emit loud and clear sound, high-performance amplifiers will try to maintain the original appearance of the signal during amplification, minimize the introduction of distortion and noise, the core indicators include output power, efficiency and fidelity, these characteristics together determine the sound quality performance and playback effect of the entire sound system, and are indispensable key components in modern audio equipment, the delay timer can temporarily stop power delivery, the delay timer is a timing control unit in the protection system, which is automatically started after the amplifier is closed due to failure, and forces the system to enter a predetermined waiting period, which ensures that the power device has enough time to dissipate heat or let the instantaneous overcurrent state disappear. After the timing ends, the timer will trigger the system to try to automatically restore power, and if the fault still exists, it will be closed again and timed again, thereby realizing cyclic protection until the fault is eliminated, and this mechanism is the core of intelligent automatic recovery.

[0023] Working principle: when in use, the working state of the amplifier is monitored in real time through the overcurrent and overtemperature detection module; once the current or temperature exceeds the safety threshold, the control module immediately outputs a signal to close the amplifier for protection; then the system enters a delay waiting state, and after the delay ends, it automatically tries to restore power; if the fault has disappeared, the system returns to normal work, if the fault still exists, it is closed again, forming a cycle of protection until the fault is eliminated. The above is the whole working principle of the present application.

[0024] It is apparent for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A method and system for safety protection of an audio amplifier circuit, characterized in that, include: The circuit safety protection method and system include an audio input source and system power-on. After receiving audio, the audio input source transmits the audio to an audio power amplification module. The audio power amplification module amplifies the audio power and then passes it to an overcurrent detection module. After the overcurrent detection module detects the overcurrent, the audio power passes to an overtemperature detection module. After the overtemperature detection module completes its detection, the audio power passes to a control module. The control module sends abnormal power to the control terminal and sends normal power to the speaker.

2. The audio amplifier circuit safety protection method and system according to claim 1, characterized in that: After the system is powered on, the audio signal passes through the audio power amplification module. The audio power amplification module detects the audio power status. If the detected status is over-temperature or over-current, the audio signal is sent back to the audio power amplification module for re-amplification after a five-second delay timer. Audio signals with normal detection status will be amplified normally.

3. The audio amplifier circuit safety protection method and system according to claim 1, characterized in that: The audio input source is the entry point for audio input, and the audio power amplification module can amplify the power of the audio.

4. The audio amplifier circuit safety protection method and system according to claim 1, characterized in that: The overcurrent detection module can detect whether the current flowing through the speaker is too high.

5. The audio amplifier circuit safety protection method and system according to claim 1, characterized in that: The over-temperature detection module can detect the temperature of the power device, and the control module can determine whether the current is over-temperature or over-current.

6. The audio amplifier circuit safety protection method and system according to claim 2, characterized in that: The control terminal can directly control the audio input source, and the speaker can produce sound.

7. The audio amplifier circuit safety protection method and system according to claim 2, characterized in that: After the system is powered on, the audio amplifier can work normally, and the delay timer can briefly stop the power transmission.

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