Power amplifier

Abstract

The invention relates to the technical field of power amplifiers, in particular to a power amplifier which comprises a voltage follower circuit, an overcurrent and voltage detection circuit, an amplifying circuit, a cooling fin, a small fan, a nixie tube display, an RS-485 communication interface and a high-efficiency switching power supply. According to the power amplifier, a PWM signal is generated by controlling an IC to drive a field effect transistor, and accurate control over output voltage is achieved; the overcurrent and voltage detection circuit monitors in real time and feeds back to the control IC to ensure stable operation of the system; the small fan adjusts the rotating speed according to the output voltage change to effectively dissipate heat; the nixie tube display displays an output voltage value, and the RS-485 communication interface supports remote monitoring; the control IC adopts a moving average algorithm for filtering, so that the voltage stability is improved; the high-efficiency switching power supply reduces the energy consumption loss; meanwhile, a sectional type current protection function is achieved, safety and reliability are ensured, and the technical effects of accurately controlling output voltage, being efficient and energy-saving, stable in operation and convenient for remote monitoring are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of power amplifiers, and in particular to a power amplifier. Background Art

[0002] With the rapid development of industries such as automobiles, home appliances, and light manufacturing, the requirements for the quality and variety of coils are becoming increasingly stringent, which has brought unprecedented opportunities and challenges to the development of coil production technology, and the requirements for the tension of coil winding and unwinding are becoming more and more stringent.

[0003] At present, a magnetic powder clutch is needed to control the tension value during the winding and unwinding process. In this process, a controller is needed to control the tension value of the winding and unwinding of the coil. In this process, the controller outputs a voltage signal to control the power amplifier. The power amplifier can amplify the low voltage and high current signal to a sufficiently high voltage and current to drive the magnetic powder clutch to generate force to control the tension value of the winding and unwinding of the coil to meet the requirements of the production process.

[0004] During the driving process, in order to obtain a force value with a good curve, the control IC will monitor the output current value to prevent damage to the driving magnetic powder clutch due to excessive current value. Summary of the invention

[0005] In order to obtain a force value with a good curve and reduce damage to the driving magnetic powder clutch caused by excessive current value, the present application provides a power amplifier.

[0006] The power amplifier provided in this application adopts the following technical solution: A power amplifier includes a voltage follower circuit, an overcurrent and voltage detection circuit, and an amplifier circuit. The voltage follower circuit receives a voltage signal output by an external controller and transmits it to a control IC. The control IC generates a PWM signal to drive a field effect transistor in the amplifier circuit. The overcurrent and voltage detection circuit monitors the input voltage and current values ​​and feeds back the detection results to the control IC. The control IC adjusts the duty cycle of the PWM signal according to the feedback information to achieve precise control of the output voltage.

[0007] Preferably, since the control IC monitors the output current value, damage to the driving magnetic powder clutch caused by excessive current value is reduced, precise control of the output voltage of the power amplifier is achieved, the stability and reliability of the output voltage under different load conditions are ensured, the response speed and control accuracy of the system are improved, and equipment malfunction caused by voltage fluctuations is effectively avoided, thereby improving the safety and stability of the overall system.

[0008] Preferably, the voltage follower circuit includes an operational amplifier U3, wherein pin 1 of the operational amplifier U3 receives a voltage signal from an external controller, and pins 3 and 4 are connected to achieve voltage following.

[0009] Preferably, the voltage follower circuit includes an operational amplifier U3, wherein pin 1 of the operational amplifier U3 receives a voltage signal from an external controller, and pins 3 and 4 are connected to achieve voltage following. By adopting the above technical solution, pin 1 of the operational amplifier U3 receives a voltage signal from an external controller, and pins 3 and 4 are connected to achieve voltage following, thereby ensuring the stability and accuracy of the input signal, reducing the impact of external interference on the input signal, and improving the reliability and stability of the system. Preferably, the overcurrent and voltage detection circuit includes voltage-dividing resistors R1 and R2, and operational amplifiers U1 and U2, wherein the voltage-dividing resistors R1 and R2 are used to divide the input voltage signal, and the operational amplifiers U1 and U2 are used to amplify the input current signal, and the control IC monitors the input voltage and current values ​​by reading the output signals of U1 and U2. By adopting the above technical solution, the overcurrent and voltage detection circuit can monitor the input voltage and current values ​​in real time, ensuring that the power amplifier is always within a safe range during operation. The voltage-dividing resistors R1 and R2 are used to divide the input voltage signal, the operational amplifiers U1 and U2 are used to amplify the input current signal, and the control IC accurately monitors the input voltage and current values ​​by reading the output signals of U1 and U2, so as to timely adjust the duty cycle of the PWM signal to avoid damage to the magnetic powder clutch due to excessive current, and ensure the stability and safety of the system. Preferably, the amplification circuit includes at least two parallel field effect tubes Q1 and Q3, and the PWM signal 1 generated by the control IC drives the gates of the field effect tubes Q1 and Q3 to achieve amplification of the output voltage. By adopting the above technical solution, at least two parallel field effect tubes Q1 and Q3 can effectively reduce the temperature rise of components when the current is too large, avoid burning the tube due to excessive temperature, and thus improve the stability and reliability of the power amplifier. At the same time, by driving the gates of the field effect tubes Q1 and Q3 through the PWM signal 1 generated by the control IC, the output voltage can be efficiently amplified, the stability and accuracy of the output voltage can be ensured, and the needs of different application scenarios can be met. Preferably, the amplifier circuit also includes a field effect tube Q2, and the PWM signal 2 generated by the control IC drives the field effect tube Q2 to turn on when the field effect tubes Q1 and Q3 are turned off, so as to pull the output signal down to the ground. By adopting the above technical solution, when the field effect tubes Q1 and Q3 of the power amplifier are turned off, the PWM signal 2 generated by the control IC drives the field effect tube Q2 to turn on, and pulls the output signal down to the ground, thereby preventing the uncertainty of the output signal that may be caused by hanging, avoiding malfunction of the equipment, and ensuring the stability and safety of the system. Preferably, it also includes a small fan and a heat sink, and the heat sink is connected to the housing of the power amplifier, and the rotation time of the small fan changes with the change of the output voltage to reduce the internal temperature.By adopting the above technical solution, the heat sink is connected to the housing of the power amplifier, and the rotation time of the small fan changes with the change of the output voltage, which effectively reduces the internal temperature and ensures that the internal electronic components work at normal temperature, thereby improving the service life and reliability of the product. Preferably, it also includes a digital tube display for displaying the voltage value output by the power amplifier. By adopting the above technical solution, the introduction of the digital tube display enables the power amplifier to display the output voltage value in real time, improves the transparency and controllability of the equipment, and facilitates the operator to intuitively monitor the operating status of the power amplifier, promptly discover abnormal conditions, and ensure the safe and stable operation of the equipment. Preferably, it also includes an RS-485 communication interface for realizing the remote monitoring function. By adopting the above technical solution, the introduction of the RS-485 communication interface enables the power amplifier to have a remote monitoring function, realizes real-time monitoring and control of the equipment status, and improves the automation level and management efficiency of the system. Preferably, the control IC uses a moving average algorithm to filter according to the change of the input voltage to obtain a stable voltage value. By adopting the above technical solution, the control IC adopts a moving average algorithm to filter according to the change of the input voltage to obtain a stable voltage value, thereby ensuring that the voltage output by the power amplifier is stable and reliable, avoiding equipment malfunction and unstable performance due to voltage fluctuations, and improving the reliability and safety of the system. Preferably, the power amplifier uses a high-efficiency switching power supply as the input power supply to reduce energy consumption losses. By adopting the above technical solution, a high-efficiency switching power supply is used as the input power supply, which significantly reduces energy consumption losses, reduces electricity costs, and improves the energy efficiency ratio of the product. Due to the improved efficiency, the heat generation of electronic components is reduced, the service life of the product is extended, and at the same time, it meets the requirements of energy conservation, emission reduction and environmental protection.

[0010] In summary, the present application includes at least one of the following beneficial technical effects: 1. Using high-efficiency switching power supply as input power supply significantly reduces energy loss, reduces electricity cost, and prolongs product life, meeting the requirements of modern industry for energy conservation and emission reduction; 2. Anti-interference electronic components are added internally, which effectively improves the anti-interference performance of the product, prevents malfunctions caused by external interference, and ensures the stability and safety of the system; 3. The addition of output current and voltage detection functions and a one-button disconnection function allows companies to intuitively monitor product operations, enhance safety protection measures, and improve equipment reliability and user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a circuit principle block diagram of the controller and power amplifier of the embodiment of the present application.

[0012] Figure 2This is a schematic diagram of the internal modules of the power amplifier.

[0013] Explanation of reference numerals: 20, overcurrent and voltage detection circuit; 30, voltage follower circuit; 40, amplifier circuit. DETAILED DESCRIPTION

[0014] The following will be combined with the attached Figure 1-Figure 2 , the technical solutions in the embodiments of the present invention are clearly and completely described. The described embodiments are only possible technical implementations of the present invention, not all possible implementations. Those skilled in the art can completely combine the embodiments of the present invention to obtain other embodiments without creative work, and these embodiments are also within the scope of protection of the present invention.

[0015] The inventors of the present application have discovered that, with the rapid development of industries such as automobiles, home appliances, and light manufacturing, the requirements for the quality and variety of coils are becoming increasingly stringent, bringing unprecedented opportunities and challenges to the development of coil production technology. In order to improve performance, the industry is also accelerating the automation process, requiring more high-precision and high-performance equipment to join, and the requirements for energy conversion in this process are also getting higher and higher. At this stage, power amplifiers are bulky, have poor anti-interference and low energy conversion efficiency, a single control output method, low output voltage accuracy, and cannot intuitively detect the size of the power amplifier output voltage. With the further upgrading of the industrial chain, equipment has begun to enter the stage of automated control. These power amplifiers cannot meet the compatibility requirements brought about by the equipment upgrade, and due to the low energy conversion efficiency and high internal temperature of the product, they cannot meet the requirements of energy conservation, emission reduction, and environmental pollution reduction required by enterprises. To this end, the present application mainly adopts the following technical solutions, including a voltage follower circuit 30, an overcurrent and voltage detection circuit 20, an amplifier circuit 40, a heat sink, a small fan, a digital tube display, an RS-485 communication interface and a high-efficiency switching power supply, which achieves the effect of reducing energy consumption loss, improving energy conversion efficiency, enhancing anti-interference ability, improving output voltage accuracy, and realizing remote monitoring and safety protection. The present application is further described in detail below.

[0016] Embodiment 1: Reference Figure 1 and Figure 2 The power amplifier provided in the embodiment of the present application includes a voltage follower circuit 30, an overcurrent and voltage detection circuit 20, an amplifier circuit 40, a heat sink, a small fan, a digital tube display, an RS-485 communication interface and a high-efficiency switching power supply.

[0017] Among them, the voltage follower circuit 30 receives the voltage signal output by the external controller and transmits it to the control IC. The control IC generates a PWM signal to drive the field effect transistor in the amplifier circuit 40. The overcurrent and voltage detection circuit 20 monitors the input voltage and current values ​​and feeds back the detection results to the control IC. The control IC adjusts the duty cycle of the PWM signal according to the feedback information to achieve precise control of the output voltage.

[0018] The heat sink is connected to the housing, and the rotation time of the small fan changes with the output voltage to reduce the internal temperature. At the same time, the digital tube display is used to display the voltage value output by the power amplifier, and the RS-485 communication interface is used to realize the remote monitoring function.

[0019] The control IC uses a moving average algorithm to filter according to the change of the input voltage to obtain a stable voltage value. The power amplifier uses a high-efficiency switching power supply as the input power supply to reduce energy loss. The power amplifier has a segmented current protection function. When the output is above 20V, it will enter the protection at 6A, when it is between 10V-20V, it will enter the protection at 5A, and when it is below 10V, it will enter the protection at 2.5A.

[0020] Specifically, the voltage follower circuit 30 includes an operational amplifier U3, wherein pin 1 of the operational amplifier U3 receives a voltage signal from an external controller, and pins 3 and 4 are connected to achieve voltage following. The operational amplifier U3 can be a common model, such as LM324 or TL081, which has the characteristics of high input impedance and low output impedance, and can effectively reduce the interference of the input signal on the circuit.

[0021] The overcurrent and voltage detection circuit 20 includes voltage-dividing resistors R1 and R2, and operational amplifiers U1 and U2. The voltage-dividing resistors R1 and R2 are used to divide the input voltage signal, and the operational amplifiers U1 and U2 are used to amplify the input current signal. The control IC monitors the input voltage and current values ​​by reading the output signals of U1 and U2. The voltage-dividing resistors R1 and R2 can use metal film resistors with higher precision, such as resistors with 1% precision, to ensure the accuracy of the detection results. The operational amplifiers U1 and U2 can also use high-precision models, such as OP07 or AD822, which have the characteristics of high gain and low noise and are suitable for precision measurement.

[0022] The amplifier circuit 40 includes at least two field effect transistors Q1 and Q3 connected in parallel. The PWM signal 1 generated by the control IC drives the gates of the field effect transistors Q1 and Q3 to achieve output voltage amplification. Field effect transistors Q1 and Q3 can be MOSFETs, such as IRF540 or IRLZ44N. These models have the characteristics of low on-resistance and high withstand voltage, and can maintain a low temperature under high current conditions. Using two field effect transistors in parallel can effectively disperse the current and reduce the temperature of a single component, thereby improving the reliability and life of the system.

[0023] In addition, it also includes a field effect tube Q2. When the field effect tubes Q1 and Q3 are turned off, the PWM signal 2 generated by the control IC drives the field effect tube Q2 to turn on, so as to pull the output signal down to the ground. The field effect tube Q2 can be the same model as Q1 and Q3, or a model specifically used to pull down the signal, such as 2N7000. In this way, when the field effect tubes Q1 and Q3 are turned off, it can ensure that the output signal is completely pulled down, avoiding the uncertainty that may be caused by floating, thereby ensuring the safety of the system.

[0024] It should be noted that the working principle of the power amplifier is to amplify the low-level control signal from the IN input through the amplifier circuit, and output the high-level signal from the OUT position to drive the magnetic powder clutch to work. When the external controller controls the machine to wind the material, different forces are required to pull the material, so the magnetic powder clutch is needed to transmit torque to control the winding and unwinding of the material. In this process, the controller will output a signal to control the power amplifier, thereby realizing the control of the magnetic powder clutch.

[0025] The external controller inputs a voltage signal to pin 1 of the U3 operational amplifier on the voltage follower circuit 30. The high impedance of the operational amplifier can effectively reduce the interference of the input signal on the circuit. Pins 3 and 4 of U3 are connected, and the input voltage is followed and given to the control IC. The control IC will generate a PWM signal 1 based on the read signal to drive the gates of the field effect transistors Q1 and Q3 in the amplifier circuit 40 to turn on Q1 and Q3. The use of two field effect transistors in parallel is to reduce the temperature rise of components when the current is too large, which may burn out the tube. The output high-level signal is output from the OUT interface to the magnetic powder clutch.

[0026] In this process, the input signal is divided by R1 and R2 on the overcurrent and voltage detection circuit 20 and input to pin 1 of U1. After the signal follower of U1, it is given to the control IC to sample and read the input voltage value and pass through the sampling resistor of R6. After amplification by the resistors R3, R4, R5, R7 and the U2 operational amplifier, the input current is read, so that the control IC can always read the input voltage and current values ​​to monitor the output status of the power amplifier.

[0027] In addition, as the tension value of the coil is rapidly changed during unwinding and rewinding, the voltage signal input by the controller to the power amplifier will also change rapidly. In this process, the duty cycle of the PWM signal 1 output by the control IC will also change. Sometimes the duty cycle may be very large, and sometimes it may become smaller. When it becomes larger, the conduction channel of Q1 and Q3 will be further increased, and the output OUT signal will become higher and higher. Otherwise, the output OUT signal will become lower and lower to meet the braking force of the magnetic powder clutch to balance the tension value of the coil, so that the coil can be more relaxed during the unwinding process. In order to prevent the voltage or current from exceeding the set voltage / current value, the system will slowly reduce the duty cycle of the PWM signal to reduce the output Out value according to the requirements. If the current exceeds the set value too much in an instant, the PWM signal will be immediately turned off to cut off the output to prevent the coil from being pulled apart or deformed, and to prevent the magnetic powder clutch from burning out, etc., to meet the requirements of safe production. Q2 gives a low level to PWM signal 1 when the control IC controls Q1 and Q3 to be turned off, and gives a high level to PWM signal 2, so that Q2 is turned on and the output signal is pulled down to ground to prevent the uncertainty of the output signal caused by floating, which may cause malfunction of the equipment and cause safety accidents.

[0028] In summary, through the variation range of the tension value of the coil, the controller can quickly output voltage to the power amplifier, so that the power amplifier can quickly amplify the output voltage value according to the voltage change to drive the magnetic powder clutch to generate pulling force to adjust the winding and release of the coil. When the voltage output by the controller is given to the power amplifier, the output voltage may fluctuate due to external influences. In order to obtain a stable input voltage value, before the power amplifier takes the value, the program uses a moving average algorithm to filter to obtain a stable voltage value, and then amplify it to give a stable voltage to drive the magnetic powder clutch. In this way, the force generated by the magnetic powder clutch will be smooth without affecting the quality of winding and releasing the coil. The power amplifier can amplify and output different voltage values ​​according to the voltage given by the controller at any time to drive the magnetic powder clutch to generate different forces to adjust the tension value range of the coil, making the coil winding and releasing movements smoother and freer without breaking or deforming the coil. A segmented current protection is used for the amplified signal of the power amplifier. When the output is above 20V, the protection is entered at 6A. When it is between 10V-20V, the protection is entered at 5A. When it is below 10V, the protection is entered at 2.5A. This mode can maximize the protection of the magnetic powder clutch from burning out due to overvoltage or overcurrent.

[0029] In addition to being used in the above industries, this power amplifier can also be used in the energy and power industry to drive various types of motors, frequency converters and energy converters, using low-signal voltages to obtain sufficiently large voltage values ​​through amplification to achieve effective energy conversion and control.

[0030] On the other hand, the heat sink is connected to the outer shell of the power amplifier, and the rotation time of the small fan changes with the output voltage to reduce the internal temperature. The heat sink can be made of aluminum, which has good thermal conductivity and can effectively conduct internal heat. The small fan can automatically adjust the speed according to the change of the output voltage. For example, using PWM control, the fan can accelerate when the load is high and slow down or stop when the load is low, so as to achieve dynamic heat dissipation. This can not only ensure the heat dissipation effect, but also save energy. When the power amplifier is working, it needs to output large current and high voltage. For safety, a heat sink is added inside the product to connect to the outer shell for heat dissipation and a small fan is built into the product. The fan rotates irregularly with the output voltage value of the power amplifier, and the rotation time within 1 minute changes with the output voltage. In this way, the temperature inside the product is reduced, so that the internal electronic components can work at normal temperature, thereby increasing the service life of the product.

[0031] The digital tube display is used to display the voltage value output by the power amplifier. You can choose a multi-digit digital tube, such as a 7-segment digital tube, to clearly display the voltage value. The digital tube display can be connected to the control IC through the I2C or SPI interface to achieve data transmission. In this way, the output voltage can be monitored in real time, which is convenient for users to understand the operating status of the equipment in a timely manner.

[0032] In addition, the RS-485 communication interface is used to realize the remote monitoring function. Standard RS-485 interface chips such as MAX485 or SP3485 can be selected. These chips have good anti-interference ability and long-distance transmission ability, and are suitable for industrial environments. Through the RS-485 interface, users can remotely monitor the status of the power amplifier, discover and solve problems in time, and improve the reliability and maintenance efficiency of the equipment. The external interface has voltage signal input and RS-485 communication control. Such a diversified interface can freely pair external devices and increase the function of remote monitoring.

[0033] The control IC uses a moving average algorithm to filter according to the change of the input voltage to obtain a stable voltage value. The moving average algorithm is a commonly used filtering method that can effectively eliminate high-frequency noise in the input signal and obtain a stable voltage value. The control IC can choose a microcontroller with integrated ADC and DSP functions, such as the STM32 or AVR series. These microcontrollers have powerful computing power and rich peripheral interfaces, and can efficiently implement filtering and control functions.

[0034] Furthermore, the power amplifier uses a high-efficiency switching power supply as the input power supply to reduce energy loss. The switching power supply can use a high-efficiency AC-DC converter, such as 7M0880 or 1M0880, which has the characteristics of high efficiency and small size and is suitable for portable and small devices. The switching power supply can convert the input AC voltage into the required stable output voltage, thereby providing reliable power support for the power amplifier.

[0035] In addition, the power amplifier has a segmented current protection function. When the output is above 20V, it will enter the protection at 6A, when it is between 10V-20V, it will enter the protection at 5A, and when it is below 10V, it will enter the protection at 2.5A. The segmented current protection function can be realized through the control IC programming, and the corresponding protection threshold is set according to the different intervals of the output voltage. When the output current exceeds the set threshold, the control IC will immediately reduce the duty cycle of the PWM signal, or even turn off the output to prevent overcurrent from damaging the equipment. This can effectively protect the power amplifier and load equipment and improve the safety and reliability of the system. The power amplifier can amplify and output different voltage values ​​at any time according to the voltage given by the controller to drive the magnetic powder clutch to generate different forces to adjust the range of the tension value of the coil, so that the coil retracting and releasing actions are smoother and freer, without problems such as breaking or deforming the coil.

[0036] The implementation principle of this embodiment is: using a high-efficiency switching power supply as the input power supply can not only significantly reduce energy consumption losses, save electricity consumption, and thus reduce the electricity costs of enterprises, but also effectively reduce the heat generated by electronic components due to the improvement of efficiency, thereby increasing the overall service life of the product. In addition, by adding anti-interference electronic components to the internal circuit of the product, the anti-interference performance of the product can be significantly enhanced, avoiding malfunctions caused by external interference, and ensuring the stability and reliability of the equipment operation.

[0037] At the same time, the product design incorporates real-time detection of output current and voltage, as well as a one-button disconnection safety protection mechanism, which enables companies to more intuitively monitor the operating status of the entire product, and promptly discover and deal with potential safety hazards. At the same time, by adding a digital tube display, users can quickly read the voltage value output by the power amplifier to ensure the convenience and accuracy of operation. The diversification of external interfaces, including voltage signal input and RS-485 communication control, not only facilitates the free configuration of the equipment, but also adds the function of remote monitoring, improving the intelligent management level of the equipment.

[0038] In addition, considering that the power amplifier needs to output large current and high voltage when working, a heat sink is specially designed inside the product and connected to the shell to enhance the heat dissipation effect. What is more innovative is that the product has a built-in intelligent fan, whose speed will automatically adjust according to the output voltage value of the power amplifier, ensuring that the rotation time within 1 minute changes with the output voltage, effectively controlling the internal temperature of the product, ensuring that the electronic components work at normal temperature, and further improving the service life and operation stability of the product.

[0039] Embodiment 2: The difference between this embodiment and the above-mentioned embodiment is that: in this embodiment, the power amplifier adopts multiple redundancy designs to improve the reliability and stability of the system.

[0040] Specifically, in addition to the main operational amplifier U3, a backup operational amplifier U3' is also provided in the voltage follower circuit 30. When the main operational amplifier U3 fails, the backup operational amplifier U3' can automatically switch to continue to perform the voltage follower function. The backup operational amplifier U3' can be selected from the same model as U3 to ensure consistent performance and reliability.

[0041] In the overcurrent and voltage detection circuit 20, in addition to the main voltage-dividing resistors R1 and R2, a set of spare voltage-dividing resistors R1' and R2' are also provided. When the main voltage-dividing resistor fails, the spare voltage-dividing resistors can be automatically switched to continue to perform the voltage-dividing function. The spare voltage-dividing resistors R1' and R2' can also be selected from the same model as the main voltage-dividing resistors to ensure consistent performance and reliability.

[0042] In the amplifier circuit 40, in addition to the main field effect transistors Q1 and Q3, a set of spare ground field effect transistors Q1' and Q3' are also provided. When the main field effect transistors Q1 and Q3 fail, the spare ground field effect transistors Q1' and Q3' can automatically switch to continue to complete the output voltage amplification function. The spare ground field effect transistors Q1' and Q3' can be selected from the same model as the main field effect transistors to ensure consistent performance and reliability.

[0043] In the design of the heat sink and small fan, in addition to the main heat sink, a spare heat sink is also added. When the main heat sink fails or its performance decreases, the spare heat sink can be automatically activated to continue to complete the heat dissipation function. The spare heat sink can also be selected with the same material and size as the main heat sink to ensure consistent heat dissipation effect.

[0044] In addition to the main digital tube display and RS-485 communication interface, a set of backup digital tube display and RS-485 communication interface is also added. When the main digital tube display and RS-485 communication interface fail, the backup device can automatically switch to continue to complete the display and communication functions. The backup digital tube display and RS-485 communication interface can be selected from the same model as the main device to ensure consistent performance and reliability.

[0045] The implementation principle of this embodiment is: by adding multiple redundant designs, the reliability and stability of the power amplifier are improved. When the main device fails, the backup device can automatically switch and continue to perform the corresponding functions, thereby ensuring the continuous operation of the system. This can significantly reduce the failure rate of the equipment, improve the availability and maintenance efficiency of the system, and is particularly suitable for industrial application scenarios with high reliability requirements.

[0046] Embodiment 3: The difference between this embodiment and the above-mentioned embodiment is that: in this embodiment, an intelligent temperature management system is introduced into the power amplifier.

[0047] Specifically, the intelligent temperature management system includes a temperature sensor and a temperature control unit. The temperature sensor can be an NTC thermistor or a PT100 platinum resistor. These sensors can monitor the temperature inside the power amplifier in real time. The temperature control unit adjusts the speed of the small fan through the PID control algorithm based on the feedback information from the temperature sensor to keep the internal temperature within the set range. When the temperature is too high, the temperature control unit will increase the speed of the small fan to speed up the heat dissipation; when the temperature is appropriate, the temperature control unit will reduce the speed of the small fan to save energy. This can more accurately control the internal temperature and improve the stability and life of the equipment.

[0048] The implementation principle of this embodiment is: by introducing an intelligent temperature management system, the power amplifier can more accurately control the internal temperature, avoid equipment damage caused by overheating, and improve the stability and reliability of the system. At the same time, by adjusting the speed of the small fan through the PID control algorithm, it can save energy and reduce operating costs while ensuring the heat dissipation effect.

[0049] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A power amplifier, characterized in that: It includes a voltage follower circuit, an overcurrent and voltage detection circuit and an amplifier circuit. The voltage follower circuit receives a voltage signal output by an external controller and transmits it to a control IC. The control IC generates a PWM signal to drive the field effect transistor in the amplifier circuit. The overcurrent and voltage detection circuit monitors the input voltage and current values ​​and feeds back the detection results to the control IC. The control IC adjusts the duty cycle of the PWM signal according to the feedback information to achieve precise control of the output voltage.

2. The power amplifier according to claim 1, characterized in that: The voltage follower circuit includes an operational amplifier U3, wherein pin 1 of the operational amplifier U3 receives a voltage signal from an external controller, and pins 3 and 4 are connected to achieve voltage following.

3. The power amplifier according to claim 1, characterized in that: The overcurrent and voltage detection circuit includes voltage-dividing resistors R1 and R2, and operational amplifiers U1 and U2. The voltage-dividing resistors R1 and R2 are used to divide the input voltage signal, and the operational amplifiers U1 and U2 are used to amplify the input current signal. The control IC monitors the input voltage and current values ​​by reading the output signals of U1 and U2.

4. The power amplifier according to claim 1, characterized in that: The amplifying circuit includes at least two field effect transistors Q1 and Q3 connected in parallel, and the PWM signal 1 generated by the control IC drives the gates of the field effect transistors Q1 and Q3 to achieve amplification of the output voltage.

5. The power amplifier according to claim 4, characterized in that: The amplifier circuit further includes a field effect transistor Q2. When the field effect transistors Q1 and Q3 are turned off, the PWM signal 2 generated by the control IC drives the field effect transistor Q2 to be turned on, so as to pull the output signal down to the ground.

6. The power amplifier according to claim 1, characterized in that: It also includes a small fan and a heat sink, wherein the heat sink is connected to the housing of the power amplifier, and the rotation time of the small fan varies with the output voltage to reduce the internal temperature.

7. The power amplifier according to claim 1, characterized in that: A digital tube display is also included, which is used to display the voltage value output by the power amplifier.

8. The power amplifier according to claim 1, characterized in that: It also includes an RS-485 communication interface for realizing remote monitoring function.

9. The power amplifier according to claim 1, characterized in that: The control IC adopts a moving average algorithm to filter according to the change of the input voltage to obtain a stable voltage value.

10. The power amplifier according to claim 1, characterized in that: The power amplifier uses a high-efficiency switching power supply as an input power supply to reduce energy consumption loss.

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