Audio power amplifier overheating protection method and audio power amplifier overheating protection system

Abstract

The invention belongs to the technical field of audio power amplifiers, and provides an audio power amplifier overheating protection method and an audio power amplifier overheating protection system.The audio power amplifier overheating protection method comprises the following steps that S1, design and model selection are conducted; s2, installation and wiring: installing a temperature sensor at a key position in the audio power amplifier, and carrying out reasonable wiring to ensure that signal transmission between the sensor and a control module is stable and reliable; s3, software programming is carried out; s4, testing and debugging; s5, integration and application; according to the invention, the overheating problem of the audio power amplifier can be found and processed in time, the potential safety hazards such as power amplifier damage and fire caused by overheating are avoided, and the personal and property safety of a user is guaranteed; through overheating protection measures, the frequency of faults caused by overheating of the power amplifier is reduced, the overall reliability of the audio system is improved, and the service life of the power amplifier is prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of audio power amplifiers, and particularly relates to an audio power amplifier overheat protection method and an audio power amplifier overheat protection system. Background Technique

[0002] With the development of automotive audio systems, as a key component, the performance and reliability of audio power amplifiers are crucial. In existing automotive power amplifier products, although various power amplifiers perform well in terms of power output, sound quality, etc., there is still room for improvement in overheat protection. Overheating can lead to a decline in the performance of the power amplifier, shortened lifespan, or even damage, affecting the normal operation of the entire audio system. Therefore, an audio power amplifier overheat protection method and an audio power amplifier overheat protection system are needed to solve the above problems. Summary of the Invention

[0003] The purpose of the present invention is to provide an audio power amplifier overheat protection method and an audio power amplifier overheat protection system to solve the problems raised in the above background technique.

[0004] To achieve the above purpose, the present invention provides the following technical solution: An audio power amplifier overheat protection method, including the following steps: S1. Design and selection: According to the specifications and working environment of the audio power amplifier, select appropriate temperature sensors and control chip components, and design the circuit schematic diagram and PCB board of the overheat protection system; S2. Installation and wiring: Install the temperature sensor at a key position inside the audio power amplifier, and perform reasonable wiring to ensure stable and reliable signal transmission between the sensor and the control module; S3. Software programming: Write the software program of the control module to implement functions such as temperature data acquisition, overheat judgment, and instruction issuance, and at the same time set appropriate temperature thresholds and overheat treatment strategies; S4. Testing and debugging: Test the overheat protection system, including simulating overheat situations, checking whether the system's response is accurate and timely, and debugging and optimizing the problems that occur; S5. Integration and application: Integrate the overheat protection system into the audio power amplifier product, and conduct overall functional testing and performance evaluation to ensure that the system can work properly and improve the reliability and safety of the audio power amplifier.

[0005] An audio amplifier overheat protection system, which is applied to the audio amplifier overheat protection method described in any one of the above, includes a temperature monitoring module, a control module, a power adjustment module, a power supply control module, and a display and alarm module. The output end of the temperature detection module is connected to the input end of the control module, the output end of the control module is connected to the input ends of the power adjustment module, the power supply control module, and the display and alarm module. The output end of the power adjustment module is connected to the power amplification circuit of the audio amplifier, and the power supply control module is connected in series to the cut-off circuit of the audio amplifier power supply.

[0006] In a further technical solution, the temperature monitoring module is composed of multiple temperature sensors, which are distributed at key positions of the audio amplifier, collect temperature data in real time, and transmit the data to the control module.

[0007] In a further technical solution, the control module receives the data transmitted by the temperature monitoring module to judge overheating. When it judges that the amplifier is overheated, it issues instructions to the power adjustment module and the power supply control module.

[0008] In a further technical solution, the power adjustment module reduces the output power of the audio amplifier according to the instructions of the control module to reduce heat generation.

[0009] In a further technical solution, when the amplifier is severely overheated, the power supply control module cuts off the power supply of the amplifier to make the amplifier stop working for cooling.

[0010] In a further technical solution, when the amplifier is overheated, the display and alarm module issues an alarm to the user in the form of an indicator light and a display screen to remind the user of the current state of the amplifier.

[0011] Compared with the prior art, the beneficial effects of the present invention are: In the present invention, the sensor of the temperature monitoring module penetrates into the key positions inside the power amplifier, collects temperature data in real time and transmits it to the control module. The control module makes an overheat judgment based on the data collected and transmitted by the temperature monitoring module, and then issues instructions to the power adjustment module and the power supply control module through the control signal line to achieve the adjustment of the output power of the power amplifier and the control of the power supply. Moreover, the control module transmits the overheat alarm information to the display and alarm module through the communication line to show the overheat state of the power amplifier to the user. Since the power adjustment module and the power supply control module are directly connected to the power amplification circuit and the power input line of the power amplifier, they actually adjust and protect the working state of the power amplifier. The cooperation of multiple modules can timely detect and handle the overheat problem of the audio power amplifier, avoid potential safety hazards such as power amplifier damage and fire caused by overheating, ensure the personal and property safety of users, and through the overheat protection measures, reduce the number of times the power amplifier fails due to overheating, improve the overall reliability of the audio system, extend the service life of the power amplifier, and the modules are connected by reasonably planned lines to ensure fast and accurate data transmission and effective execution of control instructions, jointly providing a comprehensive and multi-level solid guarantee for the overheat protection of the audio power amplifier. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic flow chart of the present invention; Figure 2 is a block diagram of the modules of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0013] The following further describes the present invention in conjunction with embodiments.

[0014] The following embodiments are used to illustrate the present invention, but cannot be used to limit the protection scope of the present invention. The conditions in the embodiments can be further adjusted according to specific conditions, and simple improvements to the method of the present invention under the premise of the concept of the present invention all belong to the scope of protection required by the present invention.

[0015] Please refer to Figure 1-2 , the present invention provides an overheat protection method for an audio power amplifier, including the following steps: S1. Design and Selection: According to the specifications and working environment of the audio power amplifier, select appropriate components such as temperature sensors and control chips, and design the circuit schematic diagram and PCB board of the overheat protection system; S11. Analysis of Power Amplifier Specifications: Conduct in-depth analysis of various specification parameters of the audio power amplifier, comprehensively and detailedly understand its power level, and clarify key indicators such as the maximum output power and the rated power; S12. Working environment assessment: Comprehensively consider the complex and ever-changing working environment inside the vehicle. The temperature inside the vehicle varies greatly in different seasons and regions. In summer, when it is hot, the temperature inside the vehicle may soar to 65°C or even higher, while in cold winter, in some areas, the temperature inside the vehicle can be as low as -30°C or below. Therefore, the selected temperature sensors and other electronic components must have the ability to work stably within such a wide temperature range; In addition, the humidity environment inside the vehicle cannot be ignored. A humid environment may cause short circuits in electronic components, so components with good moisture-proof performance should be preferentially selected; At the same time, there are various electronic devices inside the vehicle, such as the engine ignition system, in-vehicle communication devices, etc. The strong electromagnetic interference they generate may affect the normal operation of the overheat protection system. This requires that the selected temperature sensors and control chips have excellent anti-interference capabilities; for example, temperature sensors with shielding layers and control chips with electromagnetic shielding functions can be used.

[0016] S13. Temperature sensor selection: According to the temperature monitoring requirements at different positions inside the power amplifier, accurately select the appropriate type and quantity of temperature sensors; For areas where heat is concentrated, such as the power amplification circuit, thermocouple temperature sensors with fast response speed and high accuracy can be selected. They can quickly capture the instantaneous changes in temperature, and the measurement accuracy can reach ±0.5°C; In large-area heat dissipation areas such as heat sinks, multiple thermistor temperature sensors can be used for multi-point monitoring to comprehensively understand the temperature distribution of the heat sink; At the same time, according to the internal space layout of the power amplifier and the distribution of heat-generating components, reasonably determine the installation quantity of temperature sensors. For example, install 1-2 thermocouple sensors near the key heat-generating chips in the power amplification circuit, and evenly distribute 3-4 thermistor sensors at different positions on the heat sink; S14. Control chip selection: Carefully select a control chip with a fast operation speed, strong processing ability, and rich interfaces to meet the requirements of quickly processing a large amount of temperature data and efficiently communicating with other modules; For example, select a microcontroller with multiple ADC (Analog-to-Digital Converter) channels, which can simultaneously collect the analog signals output by multiple temperature sensors, quickly convert them into digital signals for processing. At the same time, the control chip should have multiple communication interfaces such as SPI, I²C, etc., to facilitate stable and efficient data interaction with the temperature monitoring module, power regulation module, power supply control module, and display alarm module; S15. Circuit schematic design: Use professional circuit design software. During the schematic design process, fully consider the electrical connection relationships and signal transmission paths between components to ensure that the circuit layout is reasonable, concise, the signal transmission path is the shortest, and the interference is the smallest; If the sensor signal conditioning circuit of the temperature monitoring module is installed as close as possible to the installation position of the temperature sensor, the length of the signal transmission line can be reduced, and signal attenuation can be decreased. At the same time, the power supply line should be reasonably planned to provide a stable and reliable power supply for different modules, avoiding the impact of power fluctuations on the operation of the system. S16. PCB board design: Design the printed circuit board (PCB) according to the circuit schematic diagram. During the PCB design stage, fully consider the heat dissipation problem. For components with relatively high power, such as the control chip and the temperature sensor conditioning circuit, design a large-area heat dissipation copper foil to increase the heat dissipation area and improve the heat dissipation efficiency of the components. Adopt reasonable wiring rules, thicken the power supply line to withstand a large current. The signal line adopts the differential wiring method to effectively reduce electromagnetic interference. And perform a multi-layer design for the PCB board. Generally, use a 4-6 layer board, sandwich the sensitive signal layer in the middle, and the power supply layer and the grounding layer on both sides to further improve the electromagnetic compatibility and electrical performance of the PCB board. S2. Installation and wiring: Install the temperature sensor at a key position inside the audio power amplifier and perform reasonable wiring to ensure stable and reliable signal transmission between the sensor and the control module. S21. Temperature sensor installation: Install the carefully selected temperature sensor at the accurately designed position at a key position inside the audio power amplifier without error. When installing the thermocouple temperature sensor, first evenly apply a layer of thermal grease on the surface of the heating chip in the power amplification circuit, then closely attach the measuring end of the thermocouple to the chip surface, and then use high-temperature resistant fixing glue to firmly fix the thermocouple to ensure good heat conduction between the sensor and the heating chip and accurately measure the actual temperature of the chip. For the thermistor temperature sensor, after cleaning the surface of the heat sink, use double-sided thermal conductive adhesive to paste the thermistor at the specified position on the heat sink to ensure close thermal contact between the sensor and the heat sink and accurately reflect the temperature change of the heat sink. S22. Wiring planning: Systematically classify and organize various signal lines and power supply lines, and use wires of different colors to distinguish them, which is convenient for subsequent installation, debugging and maintenance. Use red wires for the power supply line and blue wires for the temperature sensor signal line. For the temperature sensor signal line, select shielded wires to effectively reduce the impact of external electromagnetic interference on the temperature signal. During the wiring process, strictly follow the shortest path principle to avoid signal attenuation caused by too long lines. For example, the signal line between the temperature monitoring module and the control module should be as straight as possible to reduce the number of bends. At the same time, firmly fix the line, use wire clips to fix the wire on the structural parts inside the power amplifier to prevent the line from loosening due to the vibration during vehicle driving and affecting the stability of signal transmission. S23. Signal Transmission Assurance: After the wiring is completed, conduct a comprehensive and detailed inspection of the entire line system to ensure that all connection points are firm and reliable, without problems such as loose connections or short circuits. At the same time, properly ground the shielding layer of the temperature sensor signal line to further improve the anti-interference ability of signal transmission. Connect an LC filter circuit at the power input end to filter the power supply, remove the noise and interference signals in the power supply, and prevent them from affecting the normal operation of the temperature monitoring module and the control module, ensuring the stable and reliable signal transmission of the entire overheat protection system; S3. Software Programming: Write the software program of the control module to implement functions such as temperature data acquisition, overheat judgment, and instruction issuance. At the same time, set appropriate temperature thresholds and overheat treatment strategies; S31. Programming Language Selection: Select the C language, which is efficient, flexible, and has good support for hardware operations, as the programming language for the control module software. The C language has advantages such as high execution efficiency and strong code portability, and can give full play to the performance advantages of the control chip to achieve fast acquisition, processing of temperature data, and accurate issuance of control instructions; S32. Design of Temperature Data Acquisition Algorithm: Carefully design the temperature data acquisition algorithm to ensure that the data of each temperature sensor can be obtained quickly and accurately. Adopt the method of periodic interruption, trigger an interruption every certain time (such as 5ms), and in the interruption service program, read the analog signal output by the temperature sensor through the ADC channel of the control chip and convert it into a digital signal; For example, for a thermistor temperature sensor, according to its resistance-temperature characteristic curve, convert the collected resistance value into the actual temperature value through a software algorithm, filter the collected temperature data, adopt a moving average filtering algorithm, continuously collect 10 temperature data, and take their average value as the final measurement value to effectively remove the noise interference in the data and improve the accuracy of temperature data; S33. Design of Overheat Judgment Algorithm: Construct a scientific and intelligent overheat judgment algorithm, which not only considers the real-time value of the temperature, but also comprehensively analyzes the change trend of the temperature and historical data; For example, when the temperature exceeds the preset threshold, the algorithm further judges the rising rate of the temperature. If the temperature rises too fast in a short period of time, even if the current temperature has not reached the threshold of severe overheat, an early warning signal is sent in advance. The algorithm also records the historical data of the temperature, and through the analysis of the historical data, predicts the possible overheat trend of the power amplifier and takes preventive measures in advance; S34. Implementation of Instruction Issuance Function: Write the instruction issuance function code. When the control module determines that the power amplifier is overheated through the overheat judgment algorithm, quickly send corresponding control instructions to the power adjustment module and the power supply control module through the communication interface of the control chip; S4, Testing and debugging: Test the overheat protection system, including simulating overheat situations, checking whether the system's response is accurate and timely, and debugging and optimizing the problems that occur. S41, Preparation of testing equipment: Carefully prepare a series of professional testing equipment to lay a solid foundation for comprehensively and accurately testing the overheat protection system. Select a programmable DC power supply, which can accurately adjust the output voltage and current to simulate the power input situation when the automotive audio amplifier actually works, providing stable and flexibly adjustable power support for the system. Equip an electronic load. By precisely setting different impedance values and load types, realistically simulate various load conditions of the audio amplifier to test the system's overheat protection ability under different load conditions. Use a high-precision temperature test chamber, which can accurately control the internal temperature to simulate the working scenarios of the audio amplifier in different ambient temperatures of the vehicle, from the high-temperature environment in the hot summer in the car that may reach up to 70°C or even higher, to the low-temperature environment in some areas as low as below -40°C in the cold winter, and comprehensively test the stability and reliability of the system under extreme temperature conditions. In addition, prepare a high-performance signal generator to generate test signals of various frequencies and amplitudes and input them into the audio amplifier to evaluate the collaborative working effect of the signal monitoring module on the power amplifier overheat protection system under different signal states.

[0017] S42, Simulation of overheat situations: Use the above-mentioned testing equipment to carefully simulate various possible overheat situations. In the temperature test chamber, gradually increase the temperature at a rate of 2°C per minute to above the pre-set overheat threshold. For example, set the temperature to 80°C to simulate the overheat scenario caused by the audio amplifier working at high load for a long time or poor heat dissipation. Closely observe whether the temperature monitoring module can promptly and accurately sense the temperature change at the first moment and transmit the data to the control module at the fastest speed. Quickly adjust the load impedance through the electronic load to sharply increase the output power of the audio amplifier by 50% within a short time to simulate the overheat situation under overload conditions, and check whether the system can quickly determine the overheat of the power amplifier within 1 second and promptly activate the power adjustment module to reduce the output power, or trigger the power control module to cut off the power within 2 seconds when necessary. Simulate the overheat situation caused by sudden failures such as short circuits in the circuit. For example, instantaneously short-circuit the output terminal of the power amplifier through a short-circuit simulator, and observe the response speed of the system and the effectiveness of the protection measures, including whether the display alarm module can issue an alarm within 0.5 seconds. S43, Inspection of system response: During the process of simulating overheat situations, arrange professional technicians to carefully observe and record the various output indicators of the system. Focus on checking the display alarm module to confirm whether it can clearly and accurately send out alarms to users in the first place through flashing indicator lights, pop-up windows on high-definition display screens, etc., and the alarm information should include key contents such as real-time temperature value, overheating type and overheating duration; Pay close attention to the execution of the control module's instructions, and check whether it can quickly and accurately issue corresponding instructions to the power regulation module and the power control module based on the overheating judgment algorithm, to ensure that the power regulation module can smoothly and effectively reduce the output power of the audio amplifier, and the power control module can decisively and reliably cut off the power supply of the amplifier when it is seriously overheated; It is also necessary to monitor the stability of data transmission between the temperature monitoring module and the control module, as well as the smoothness of the collaborative work between the modules, to ensure that the entire system can operate efficiently and stably in an overheated state, and that the response time of each operation is within the design requirements; S44, Problem debugging and optimization: Once a problem is found in the system during the test, such as false alarm, response delay, inadequate implementation of protection measures, etc., a professional technical team will be immediately organized to conduct in-depth analysis and debugging using advanced debugging tools and rich experience; Use a high-precision oscilloscope to monitor the temperature sensor output signal, the communication signal between the control module and other modules in real time, observe the waveform, amplitude, phase and other parameters of the signal, and check whether there is interference, attenuation or abnormal fluctuation during signal transmission; Use a logic analyzer to analyze the logic operation process inside the control module to check whether the execution logic of the overheating judgment algorithm is correct and whether the timing and content of the instructions are accurate; For software problems, use the debugger to debug the software program of the control module step by step, check the execution of the code line by line, and find possible loopholes and errors in data collection, processing, and instruction generation; If the temperature data collection is found to be inaccurate, it is found that there is a problem of virtual connection between the sensor and the signal conditioning circuit. The connection points should be re-welded and reinforced in time. If the overheating judgment algorithm misjudges, the algorithm parameter settings or algorithm logic should be adjusted to enable it to more accurately and sensitively judge the overheating state of the power amplifier. Through repeated testing, debugging and optimization, we ensure that the system can operate stably and reliably under various complex working conditions, and achieve or even exceed the expected performance indicators; S5, Integration and Application: Integrate the overheat protection system into the audio amplifier product, conduct overall functional testing and performance evaluation to ensure that the system can work properly and improve the reliability and safety of the audio amplifier; S51. System integration implementation: Integrate the overheat protection system with the audio amplifier product. During the integration process, strictly follow the pre-established integration plan to ensure that the overheat protection system is perfectly compatible with the original circuit and control logic of the audio amplifier. Perform a detailed check on the connection between each module to ensure that the sensor wire of the temperature monitoring module is firmly and reliably connected to the key position inside the amplifier, and that the signal transmission line is free of damage, short circuit or open circuit. Carefully check whether the communication line connection between the control module and the power regulation module, power control module and display alarm module is correct, and whether the communication protocol settings match; For example, when connecting the control signal lines of the control module and the power regulation module, the wiring should be carried out strictly in accordance with the electrical specifications to ensure the anti-interference ability of the line and the stability of signal transmission; At the same time, the integrated system is subjected to comprehensive electrical performance tests, including power integrity tests and signal integrity tests, to ensure the stability and reliability of the system at the electrical level and that all electrical parameters meet the design standards; S52, compatibility test: To ensure that the overheat protection system can work properly in different vehicle models and complex automotive electronic environments, extensive compatibility tests are carried out; Audio amplifiers with integrated overheat protection systems were installed on cars of different brands and models to simulate the working conditions of cars under various actual driving conditions, such as frequent starts and stops in congested urban roads, long-term high-speed driving on highways, and bumps and vibrations under different road conditions. During the test, the mutual interference between the overheat protection system and other electronic devices in the car was closely monitored; For example, when the car starts the engine ignition system, vehicle communication equipment, air conditioning system and other high-power electronic equipment, observe whether the overheat protection system will be disturbed and cause false alarms or failure of protection measures. At the same time, check whether the overheat protection system will have adverse effects on the normal operation of other electronic equipment; Through repeated testing under different vehicle models and complex working conditions, compatibility issues can be discovered and resolved in a timely manner, ensuring that the overheating protection system can operate stably and reliably in various automotive environments and coexist harmoniously with various automotive electronic equipment. S53, Functional test: Simulate various actual usage scenarios again and conduct comprehensive and detailed functional tests on the integrated system; Under normal working conditions, check whether the temperature monitoring module can accurately and real-time collect the temperature data of key positions inside the audio amplifier and accurately transmit the data to the control module. The accuracy of data transmission must reach more than 99.9%; Verify whether the overheating judgment algorithm of the control module can accurately judge whether the power amplifier is in an overheating state based on the temperature data, and whether it can quickly and accurately issue corresponding instructions to the power regulation module and power control module when the temperature exceeds the preset threshold. The accuracy of the instructions issued must reach 100%; Test whether the power regulation module can smoothly and effectively adjust the output power of the audio amplifier after receiving the command to reduce the output power, and whether the quality of the audio signal is affected during the adjustment process. The distortion rate of the audio signal must be controlled within 0.1%; Check whether the power control module can decisively and reliably cut off the power supply when the amplifier is seriously overheated, and whether it can safely and accurately restore the power supply after the temperature returns to normal. The success rate of power cut-off and restoration must reach 100%; At the same time, the display alarm module is fully tested to ensure that when the amplifier overheats, it can promptly issue an alarm to the user through intuitive and eye-catching indicator light flashing and clear and accurate display pop-up windows, and display the overheating status information of the amplifier in detail. The accuracy and completeness of the alarm information must reach 100%; Through comprehensive testing of each functional module, we ensure that the integrated system can work normally and efficiently in various actual usage scenarios, and all functional indicators meet the design requirements; S54, Performance evaluation: Conduct rigorous and scientific performance evaluation on the integrated system, conduct quantitative analysis from multiple key dimensions, and conduct multiple comparative tests on the temperature monitoring module using professional temperature calibration equipment in terms of temperature detection accuracy; In different temperature ranges, such as 20℃-40℃, 40℃-60℃, and 60℃-80℃, the deviation between the temperature data collected by the system and the measured value of the calibration equipment is recorded respectively, and the average error range is calculated to ensure that it is within ±0.5℃ to meet the high-precision monitoring requirements; In the measurement of response time, high-speed data acquisition equipment is used to accurately record the time interval from the occurrence of simulated overheating to the system initiating corresponding protection measures. At least 100 tests are conducted, covering different overheating degrees and load conditions. The average value is taken as the final response time, which is required to be no more than 1 second to ensure that the system can respond to overheating crises in a timely manner. During the stability test, the integrated audio power is placed in a simulated actual automotive working environment and runs continuously for 72 hours. During this period, the system status is recorded every hour, including the working parameters of each module and whether there is any fault. If an abnormality occurs, record the fault phenomenon and occurrence time in detail, evaluate system stability by fault frequency and severity, and ensure that the system performance does not significantly decrease during long-term operation; Set multiple groups of experimental conditions in the environmental test chamber for different environmental temperatures, humidities, and electromagnetic interference intensities. Combine with an electromagnetic interference generator to generate different intensities of electromagnetic interference, and test the reliability and stability of the system in a complex environment. For example, in an environment with a temperature of 50°C, a humidity of 80% RH, and strong electromagnetic interference, observe whether the system can operate continuously and stably, and whether all functions are normal, so as to comprehensively evaluate the adaptability of the system in the actual use scenario; Through comprehensive and in-depth performance evaluation, accurately grasp the performance status of the integrated system, and provide strong data support for subsequent product optimization and improvement; S55, Product Optimization and Application Promotion: According to the results of compatibility testing, functional testing, and performance evaluation, conduct targeted optimization on the audio power amplifier product integrated with the overheat protection system; If compatibility problems are found in the system on certain vehicle models, solve them by adjusting the circuit layout, optimizing the software algorithm, or replacing some electronic components; If the performance indicators do not meet the expected requirements, such as the temperature detection accuracy is not high enough, optimize the selection of the temperature sensor, or improve the design of the signal conditioning circuit; If the response time is too long, optimize the software program of the control module to improve the execution efficiency of the algorithm; After a series of optimizations and improvements, launch the product to the market for application promotion. During the promotion process, provide users with detailed product usage instructions and technical support to ensure that users can use the overheat protection system correctly and effectively, and give full play to its advantages in ensuring the safe and stable operation of the audio power amplifier. An overheat protection system for an audio power amplifier is applied to the overheat protection method for an audio power amplifier described in the above embodiment, and includes a temperature monitoring module, a control module, a power adjustment module, a power supply control module, and a display and alarm module. The output end of the temperature detection module is connected to the input end of the control module, the output end of the control module is connected to the input end of the power adjustment module, the output end of the power adjustment module is connected to the input end of the power supply control module, and the output end of the power supply control module is connected to the input end of the display and alarm module; The temperature monitoring module consists of multiple high-precision temperature sensors operating in cooperation. Multiple high-precision temperature sensors are precisely arranged according to the unique heat generation characteristics inside the power amplifier, and are cleverly and accurately distributed at key temperature-sensitive positions such as the power amplification circuit and the heat sink. They continuously and real-time collect temperature data at the location at a very high frequency. The collected temperature data is transmitted to the control module through the signal transmission line at a very high speed, providing accurate and reliable first-hand information for subsequent overheat judgment; By setting up a temperature detection module, each high-precision temperature sensor is connected to the signal acquisition circuit of the temperature monitoring module through wires with high temperature resistance and strong flexibility. These wires are laid inside the power amplifier according to a pre-planned path, carefully avoiding other heat-generating components or strong interference sources to fully ensure the stability of signal transmission. From the output end of the signal acquisition circuit of the temperature monitoring module, a data transmission line meeting the communication protocol standard is led out and precisely connected to a specific data input pin of the control module; The control module undertakes the core responsibilities of data reception, analysis and judgment, and instruction issuance; Inside the control module, a set of precise and intelligent overheat judgment algorithm is preset. This algorithm comprehensively considers various factors such as the real-time value, change trend, and historical data of the temperature. Once the algorithm determines that the current temperature exceeds the preset overheat threshold, the control module immediately makes a rapid response, precisely sends control instructions to the power adjustment module and the power supply control module, and at the same time transmits overheat alarm information to the display and alarm module. During the entire overheat protection process, relying on its powerful computing ability and fast decision-making mechanism, the control module coordinates the work of each module in an orderly manner to effectively ensure the efficient and stable operation of the system; By setting up the control module, the control module is closely connected to the temperature monitoring module through a dedicated data transmission line to ensure the rapid and accurate reception of temperature data; At the same time, reliable communication connections are established between the control module and the power adjustment module, the power supply control module, and the display and alarm module; The connections with the power adjustment module and the power supply control module are mainly achieved through control signal lines. These control signal lines can accurately transmit the instructions of the control module to the corresponding modules to achieve the adjustment of the output power of the power amplifier and the control of the power supply; The connection with the display and alarm module is achieved through a communication line. Through this communication line, the control module transmits overheat alarm information and related temperature data and other information to the display and alarm module to timely and intuitively display the overheat state of the power amplifier to the user; The power adjustment module, whose main responsibility is to precisely regulate the output power of the audio power amplifier according to the instructions issued by the control module. When receiving the instruction to reduce the output power transmitted from the control module, the power adjustment module quickly responds and, through a carefully designed power adjustment circuit inside, subtly changes the working state of the power amplification components inside the power amplifier, thereby effectively reducing the output power; During this process, the power adjustment module can smoothly reduce the output power of the power amplifier without affecting the basic characteristics of the audio signal, significantly reducing the heat generated by the internal components of the power amplifier due to high-power operation, providing strong support for alleviating the overheat problem of the power amplifier; By setting up a power adjustment module, one end of the power adjustment module is connected to the control module through a control signal input line to receive the power adjustment instructions sent by the control module in real time. The other end is tightly connected to the power amplification circuit of the audio power amplifier through a power output line to directly adjust the output power of the power amplifier. When connecting the power output line, the current-carrying capacity of the line and the signal transmission stability are fully considered to ensure that the adjusted power signal can be accurately and efficiently transmitted to the power amplification circuit of the power amplifier, realizing precise control of the power amplifier's output power; Power supply control module. When the power amplifier has a serious overheating condition, the control module will quickly send a power cut-off instruction to the power supply control module; After receiving the instruction, the power supply control module immediately activates the internal power cut-off circuit to cut off the power supply of the power amplifier at an extremely fast speed, making the power amplifier stop working and enter the natural cooling state, effectively avoiding irreversible damage to the power amplifier hardware caused by continuous overheating, providing the most direct and effective protection for the power amplifier. At the same time, after the temperature of the power amplifier returns to normal, the power supply control module can also safely and accurately restore the power supply of the power amplifier according to the instruction of the control module to ensure that the audio system can quickly resume normal operation; By setting up a power supply control module, the power supply control module is tightly connected to the control module through a control signal input line to receive the power supply control instructions sent by the control module in real time. On the power input line of the power amplifier, the power supply control module is connected in series with a power cut-off circuit, which can quickly and reliably cut off or restore the power supply of the power amplifier under the instruction of the control module. During the connection process, the current-carrying capacity and electrical safety of the power line are considered to ensure that the power supply control module can work stably and efficiently, providing a solid guarantee for the power supply safety of the power amplifier; Display and alarm module. After receiving the overheating alarm information transmitted by the control module, the display and alarm module acts quickly, clearly sending an alarm to the user through various means such as the intuitive and eye-catching flashing of indicator lights and the pop-up window on the high-definition display, and displaying in detail the current overheating state of the power amplifier, including key information such as the real-time temperature value and the overheating duration. Users can clearly understand the working state of the power amplifier at a glance without complex operations and professional knowledge and take corresponding measures in time, such as parking and waiting for the power amplifier to cool down or contacting professional maintenance personnel, etc.; By setting up a display and alarm module, the display and alarm module establishes a connection with the control module through a communication line to stably and quickly receive the overheating alarm information and related temperature data sent by the control module. Inside the display and alarm module, devices such as indicator lights and displays are connected to the communication line through a drive circuit. The drive circuit accurately controls the on / off, flashing frequency of the indicator lights and the display of information such as text and charts on the display according to the received signal to ensure that clear and accurate alarm content is presented to the user: Although embodiments of the present invention have been shown and described, those of ordinary skill in the art will appreciate that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An audio power amplifier overheat protection method, characterized in that: It includes the following steps: S1. Design and selection: According to the specifications and working environment of the audio power amplifier, select appropriate temperature sensors and control chip components, and design the circuit schematic diagram and PCB board of the overheat protection system; S2. Installation and wiring: Install the temperature sensor at a key position inside the audio power amplifier, and perform reasonable wiring to ensure stable and reliable signal transmission between the sensor and the control module; S3. Software programming: Write the software program of the control module to implement the functions of temperature data acquisition, overheat judgment, and instruction issuance, and at the same time set appropriate temperature thresholds and overheat treatment strategies; S4. Testing and debugging: Test the overheat protection system, including simulating overheat conditions, checking whether the system response is accurate and timely, and debugging and optimizing the problems that occur; S5. Integration and application: Integrate the overheat protection system into the audio power amplifier product, conduct overall function testing and performance evaluation to ensure that the system can work normally and improve the reliability and safety of the audio power amplifier.

2. An overheat protection system for an audio power amplifier, which is applied to the overheat protection method of the audio power amplifier described in claim 1, includes a temperature monitoring module, a control module, a power adjustment module, a power supply control module, and a display and alarm module. The output end of the temperature detection module is connected to the input end of the control module, the output end of the control module is connected to the input ends of the power adjustment module, the power supply control module, and the display and alarm module. The output end of the power adjustment module is connected to the power amplification circuit of the audio power amplifier, and the power supply control module is connected in series to the cut-off circuit of the audio power amplifier power supply.

3. The audio power amplifier overheat protection method according to claim 1, wherein: The temperature monitoring module is composed of multiple temperature sensors, which are distributed at key positions of the audio power amplifier, collect temperature data in real time, and transmit the data to the control module.

4. The audio power amplifier overheat protection method according to claim 1, characterized in that: The control module receives the data transmitted by the temperature monitoring module for overheat judgment. When it judges that the power amplifier is overheated, it issues instructions to the power adjustment module and the power supply control module.

5. The audio power amplifier overheat protection method according to claim 1, wherein: The power adjustment module reduces the output power of the audio power amplifier according to the instructions of the control module to reduce heat generation.

6. The audio power amplifier overheat protection method according to claim 1, characterized in that: When the power amplifier is severely overheated, the power supply control module cuts off the power supply of the power amplifier to stop the power amplifier from working for cooling.

7. The audio power amplifier overheat protection method according to claim 1, characterized in that: When the power amplifier is overheated, the display and alarm module issues an alarm to the user through the indicator light and the display screen to remind the user of the current state of the power amplifier.

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