An audio device and a method for adjusting quiescent current of an audio power amplifier

Abstract

The application belongs to the technical field of electric appliance circuit, and particularly relates to a sound equipment and an audio power amplifier static current adjusting method, which comprises a playing assembly, the playing assembly comprises a shell, an adjusting device is arranged on the inner side of the shell, and the sampling end of the adjusting device comprises a digital potentiometer, a seventh resistor, a seventh NPN triode, a connection upper end and a connection lower end. The audio power amplifier in the existing sound equipment can change the static current after temperature change due to the triode characteristics, which not only affects the hearing and the index, but also can cause the power amplifier burning in the case of positive feedback of temperature and current in the serious case. The traditional audio power amplifier often uses a temperature-sensitive resistor to stabilize the static current, and the working principle determines that the static current cannot be accurately maintained, and only the working range can be ensured. Moreover, due to the temperature sampling point, the effect is often poor.

Description

Technical Field

[0001] This invention belongs to the field of electrical circuit technology, specifically relating to a method for adjusting the static current of an audio device and an audio amplifier. Background Technology

[0002] Audio equipment is a common electronic device in daily life. In some professional fields, there are high requirements for the sound quality of audio equipment. The quality of existing audio amplifiers varies greatly, which is largely related to the current received by the internal power amplifier.

[0003] The invention disclosed in CN202211495724.9 is an ear-hook type earphone, including an earphone body with an ear hook connected to it. A rotating mechanism is provided between the ear hook and the earphone body. The rotating mechanism includes a gear fixed to the end of the ear hook. The earphone body has a mounting position for accommodating the gear, and the mounting position also has a snap-fit ​​part that meshes with the gear. Compared with the prior art, this invention provides a rotating mechanism between the ear hook and the earphone body, making the relative angle between them adjustable, thereby improving wearing comfort. Furthermore, the ear-hook type earphone of this invention also includes a frequency response compensation module. This module enhances the audio signal when the earphone body deviates from a predetermined position, compensating for the attenuation of sound as it travels from the earphone body to the ear canal. This allows the user to obtain good sound quality even when the earphone body deviates from the predetermined position, thus balancing the needs of sound quality and wearing comfort.

[0004] The invention disclosed in CN202211104033.1 is an integrated amplifier, comprising an integrated amplifier with a terminal block fixedly connected to its back. A protective cover is fixedly connected to the back of the integrated amplifier and over the surface of the terminal block. A protective plate is movably connected to the top of the protective cover via a hinge. A locking block is fixedly connected to the front of the protective plate. A transmission chamber is opened inside the protective cover, and the locking block penetrates into the transmission chamber. A rotating block is provided at the bottom of the protective cover, and a screw is fixedly connected to the top of the rotating block, with the top of the screw penetrating into the transmission chamber. This invention protects the terminal block with the protective cover and protective plate, and effectively prevents the heat dissipation mesh from becoming clogged by replacing it, thus increasing the working efficiency of the integrated amplifier. It replaces the existing method of directly exposing the terminal block to the outside environment, avoiding the possibility of the terminal block being easily impacted by external objects during use.

[0005] However, due to the characteristics of transistors, the quiescent current of audio power amplifiers in the above-mentioned existing technologies also changes with temperature. This not only affects the listening experience and performance, but in severe cases, the positive feedback between temperature and current may cause the power amplifier to burn out. Traditional audio power amplifiers often use thermistors to stabilize the quiescent current. The working principle of thermistors determines that they cannot accurately maintain the quiescent current. They can only ensure that the amplifier operates within a reasonable range, and due to the problem of temperature sampling points, the effect is often not good. Summary of the Invention

[0006] To address the aforementioned shortcomings in existing technologies, this invention provides an audio device that solves the problem that in existing audio power amplifiers, due to the characteristics of transistors, the quiescent current changes with temperature variations. This not only affects the listening experience and specifications but, in severe cases, can cause the amplifier to burn out due to positive feedback between temperature and current. Traditional audio power amplifiers often use thermistors to stabilize the quiescent current, but their working principle dictates that they cannot accurately maintain the quiescent current, only ensuring that they operate within a reasonable range. Furthermore, due to limitations in temperature sampling points, the performance is often unsatisfactory.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: An audio device includes a playback component. The playback component includes a housing. Two first power amplifier speakers are disposed on the outer side of the housing. An energy storage device is disposed on the inner side of the housing. An adjustment device is disposed on the inner side of the housing. The sampling terminal of the adjustment device includes a digital potentiometer, a seventh resistor, a seventh NPN transistor, an upper connection terminal, and a lower connection terminal. The upper connection terminal of the digital potentiometer is connected to the upper connection terminal. The lower connection terminal of the digital potentiometer is connected to the base of the seventh NPN transistor and the upper connection terminal of the seventh resistor. The lower connection terminal of the seventh resistor is connected to the emitter of the seventh NPN transistor and the lower connection terminal. The collector of the seventh NPN transistor is connected to the upper connection terminal. The emitter of the seventh NPN transistor is connected to the lower connection terminal. The upper connection terminal is connected to the upper arm of the first power amplifier speakers, and the lower connection terminal is connected to the lower arm of the first power amplifier speakers.

[0008] Furthermore, the adjustment terminal of the adjustment device includes a numerical control module, a first low-pass filter, a second low-pass filter, a fifth resistor, a sixth resistor, a microcontroller unit, a first NPN transistor, and a second PNP transistor. The upper end of the numerical control module is connected to the base of the first NPN transistor, and the lower end of the numerical control module is connected to the base of the second PNP transistor. The emitter of the first NPN transistor is connected to the left end of the first low-pass filter and the upper end of the sixth resistor. The lower end of the sixth resistor is connected to the upper end of the fifth resistor. The lower end of the fifth resistor is connected to the emitter of the second PNP transistor and the left end of the second low-pass filter. The right end of the first low-pass filter is connected to the IN+ interface of the microcontroller unit, and the second low-pass filter is connected to the IN- interface of the microcontroller unit. The microcontroller unit is connected to a digital potentiometer.

[0009] Multiple components inside the adjustment device work together to adjust the static current of the first power amplifier speaker in real time. The microcontroller unit (MCU) is a chip-level computer that integrates memory, counters, USB, A / D conversion, UART, PLC, DMA and other peripheral interfaces, as well as LCD driver circuits, onto a single chip with appropriate reduction in the frequency and specifications of the central processing unit. It can collect and analyze the current of the first power amplifier speaker and control the other components in combination. The first and second low-pass filters allow low-frequency signals to pass through normally, while high-frequency signals exceeding the set threshold are blocked or weakened. However, the degree of blocking or weakening will change according to different frequencies and different filtering programs. Users can adjust the settings according to specific usage conditions to block high-frequency audio signals from the first power amplifier speaker during normal operation. The fifth and sixth resistors have their own resistance values, which can protect the circuit and assist the microcontroller unit in providing calculation basis for various values ​​in the circuit. The first NPN transistor and the second PNP transistor have the functions of current amplification and switching. They can convert weak electrical signals into signals of a certain strength and limit the direction of current flow.

[0010] Furthermore, a support component is provided behind the playback component. The support component includes a Y-shaped support frame, which is connected to the housing. A placement slot is provided above the Y-shaped support frame, and a wearable component is provided on the placement slot. A rotating connector is provided below the Y-shaped support frame, and a support base plate is provided below the rotating connector. The support base plate is rotatably connected to the Y-shaped support frame through the rotating connector. A limiting rib is provided on the Y-shaped support frame.

[0011] The support components provide mounting positions for multiple parts. The Y-shaped support frame is used to fix the housing and prevent it from tipping over when placed on a table. The placement slot provides mounting positions for wearable components. The support base plate provides bottom support for the entire speaker. The support base plate is rotatably connected to the Y-shaped support frame through a rotating connector. Users can adjust the tilt angle between the Y-shaped support frame and the support base plate during use and adjust the speaker's playback direction at any time. The limiting rib can limit the angle between the support base plate and the Y-shaped support frame to prevent the entire speaker from tipping over due to a shift in the center of gravity if the angle between the support base plate and the Y-shaped support frame is too small.

[0012] Furthermore, the wearable component includes a clamp arm, with sliding grooves on both inner sides of the clamp arm. A telescopic arm is provided in the sliding grooves, and the telescopic arm is slidably connected to the clamp arm. A rotating shaft is provided at the lower end of the telescopic arm, and an ear cover is provided on the rotating shaft. The ear cover is rotatably connected to the telescopic arm through the rotating shaft. A soft pad is provided on the outer side of the ear cover, and a second power amplifier speaker is provided in the center of the soft pad. A receiving device is provided inside the second power amplifier speaker. An energy storage device is provided on the ear cover, and magnetic charging protrusions are provided on both sides of the energy storage device. The energy storage device can be connected to the magnetic charging protrusions.

[0013] The wearable component is a head-mounted assembly. The telescopic arm and clamp arm are slidably connected, allowing the user to place the clamp arm on their head. The user can adjust the position of the telescopic arm and clamp arm according to their head size, ensuring the earcups completely cover the ears. The elastic padding directly contacts the user's ears, guaranteeing comfort. The earcups are rotatably connected to the telescopic arm via a pivot. To wear the device, the user first removes the wearable component from its slot, then rotates both earcups 180 degrees and places them on their head. The receiving device receives the electrical signals emitted by the playback component and transmits them to the second power amplifier speaker. The second power amplifier speaker then amplifies and emits the sound. In its current state, the device adjusts the signal strength to a volume level suitable for close to the human ear. When the user is not wearing it, the wearable component is placed outside the playback component. The second power amplifier speaker will work in conjunction with the first power amplifier speaker to form a sound group. In its current state, the second power amplifier speaker will adjust the signal strength to a volume level suitable for external playback and work in tandem with the first power amplifier speaker to create a stereo sound effect, which can further enhance the user experience. When the wearable component is placed outside the playback component, the power storage device on the earcup shell is connected to the magnetic charging protrusion on the energy storage device. The energy storage device provides power to the power storage device, so that the wearable component can be used wirelessly while the user is wearing it.

[0014] Furthermore, both sides of the clamping arm are provided with buckles, which are rotatably connected to the clamping arm. The outer side of the telescopic arm is provided with a slot, and the buckle is provided with a protrusion with the same shape as the slot below it. The protrusion of the buckle can be placed in the slot and the two are interlocked.

[0015] The telescopic arm has a slot on its outer side, and a protrusion with the same shape as the slot is located below the buckle. The protrusion of the buckle can be placed in the slot and the two are interlocked. When the protrusion of the buckle is placed in the slot, it can lock the position between the clip arm and the telescopic arm, preventing relative sliding between the telescopic arm and the clip arm. This ensures that the wearable component will not move during the user's wearing process, causing relative displacement between the telescopic arm and the clip arm. When the user needs to adjust the wearable component, they can press one end of the buckle to make the protrusion of the buckle pop up and disengage from the slot. At that time, the user can adjust the relative position between the telescopic arm and the clip arm to make the wearable component fit their body.

[0016] A method for regulating the quiescent current of an audio power amplifier, comprising the following steps: S1. Differential ADC Sampling: The ADC circuit consists of multiple components, including a microcontroller unit, an upper connection, a lower connection, a seventh NPN transistor, a seventh resistor, and a digital potentiometer. After power-on, the upper and lower connections transmit the actual voltage value between the upper and lower arms of the first power amplifier speaker to the microcontroller unit. In sampling mode, the switch is on, and the microcontroller unit tracks the level changes of the analog input signal until a hold signal arrives. In hold mode, the switch is off, the tracking process stops, and the microcontroller unit maintains the instantaneous value of the input signal before the switch is off, calculating the current quiescent current based on the current resistance values ​​of the seventh resistor and the digital potentiometer. S2. Current Regulation: The CNC module obtains the current quiescent current from the microcontroller unit, and then controls the magnitude of the quiescent current. The regulated current is output to the microcontroller unit through the first NPN transistor. After the current is emitted from the emitter of the first NPN transistor, it passes through the first low-pass filter. In order to monitor the value of the quiescent current normally when the first power amplifier speaker is working normally, the first low-pass filter is added before the ADC input to filter out high-frequency audio signals. The first low-pass filter allows the regulated low-frequency signal to pass normally, while high-frequency signals exceeding the threshold value set by the first low-pass filter are blocked and weakened. Then, the microcontroller unit controls the digital potentiometer to adjust the resistance value of the digital potentiometer with high precision, further adjusting the current magnitude, and then transmitting it to the first power amplifier speaker to ensure that the first power amplifier speaker always works in the designed working state and reduces the performance changes caused by changes in quiescent current.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The adjustment device can precisely adjust the static current of the audio power amplifier, ensuring that the power amplifier always works in the designed operating state, reducing performance changes caused by static current variations, and better protecting the power amplifier from burning out due to high temperature. The digital potentiometer uses a digital control method to adjust the resistance value, which has significant advantages such as flexible use, high adjustment precision, no contact, low noise, not easy to be contaminated, vibration resistance, anti-interference, small size, and long life. It is controlled by digital input to generate an analog output, and the current can be adjusted in the range of hundreds of microamps to several milliamps according to specific usage needs. The seventh resistor R7 has its own resistance value, which can protect the circuit. In actual use, a resistor with a resistance value of 1,000 Ω is often used. The large resistance value can limit the current to a very small range. The seventh NPN transistor has the functions of current amplification and switching. It can convert weak electrical signals into signals of a certain strength. It is connected to the upper end and the lower end to the first power amplifier speaker, transmitting the actual voltage value between the upper and lower arms of the first power amplifier speaker in real time. Differential ADC sampling obtains the actual voltage value between the upper and lower arms of the power amplifier. The current quiescent current can then be calculated based on the output resistance value. The quiescent current can be adjusted by controlling the digital control module. Because both the ADC and the digital potentiometer are highly accurate, the required quiescent current value can be adjusted with high precision. In order to monitor the quiescent current value normally while the power amplifier is working, a low-pass filter module is added before the ADC input to filter out the audio signal. Alternatively, digital filtering or FFT technology can be used to process the data after sampling. Digital filtering also has the advantages of high precision, high reliability, programmable changeability or multiplexing, and easy integration to obtain the actual quiescent current value. When a user wants to wear the wearable component, they first remove it from the placement slot, then rotate both earcups 180 degrees and place it on their head. The receiving device receives the electrical signals emitted by the playback component and transmits them to the second power amplifier speaker. The second power amplifier speaker adjusts the signal level to a volume suitable for the user's ears. When the user is not wearing the component, it is placed outside the playback component. The second power amplifier speaker works in conjunction with the first power amplifier speaker to form a sound system. The second power amplifier speaker adjusts the signal level to a volume suitable for external playback and works in tandem with the first power amplifier speaker to create a stereo sound effect, further enhancing the user experience. When the wearable component is placed outside the playback component, the power storage device on the earcup connects to the magnetic charging contacts on the energy storage device. The energy storage device provides power to the power storage device, allowing the wearable component to be used wirelessly while the user is wearing it. Attached Figure Description

[0018] Figure 1This is a three-dimensional structural diagram of an embodiment of an audio device according to the present invention (viewpoint 1). Figure 2 This is a three-dimensional structural schematic diagram (viewpoint 2) of an embodiment of an audio device according to the present invention. Figure 3 This is a three-dimensional structural diagram (viewpoint 3) of an embodiment of an audio device according to the present invention. Figure 4 This is a top view of an embodiment of an audio device according to the present invention; Figure 5 for Figure 4 Sectional view of AA; Figure 6 for Figure 5 A magnified view of a section at point B in the middle; Figure 7 This is a partial circuit diagram (part one) of the adjustment device in an embodiment of an audio device according to the present invention. Figure 8 This is a partial circuit diagram (part two) of the adjustment device in an embodiment of an audio device according to the present invention.

[0019] The reference numerals in the accompanying drawings include: Support component 1, Y-shaped support frame 101, rotating connector 102, support base plate 103, limiting rib 104, placement slot 105, playback component 2, housing 201, first power amplifier speaker 202, energy storage device 203, adjustment device 204, adsorption charging contact 205, CNC module 206, first low-pass filter 207, second low-pass filter 208, digital potentiometer 209, upper connection 210, lower connection 211, first N PN transistor T1, second PNP transistor T2, sixth transistor T6, fifth resistor R5, sixth resistor R6, seventh resistor R7, seventh NPN transistor T7, microcontroller MCU, wearable component 3, clamp arm 301, telescopic arm 302, rotating shaft 303, ear cover shell 304, soft pad 305, second power amplifier speaker 306, receiving device 307, energy storage device 308, buckle 309, card slot 310, sliding groove 311. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0022] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0023] In the description of this invention, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating a connection between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Example

[0024] like Figures 1-8As shown, an audio device includes a playback component 2, which includes a housing 201. Two first power amplifier speakers 202 are located on the outer side of the housing 201. An energy storage device 203 is located inside the housing 201. An adjustment device 204 is also located inside the housing 201. The sampling terminal of the adjustment device 204 includes a digital potentiometer 209, a seventh resistor R7, a seventh NPN transistor T7, an upper connection terminal 210, and a lower connection terminal 211. The upper terminal of the digital potentiometer 209 is connected to the upper connection terminal 210. The lower end of potentiometer 209 is connected to the base of the seventh NPN transistor T7 and the upper end of the seventh resistor R7. The lower end of the seventh resistor R7 is connected to the emitter of the seventh NPN transistor T7 and the lower connection 211. The collector of the seventh NPN transistor T7 is connected to the upper connection 210. The emitter of the seventh NPN transistor T7 is connected to the lower connection 211. The upper connection 210 is connected to the upper arm of the first power amplifier speaker 202. The lower connection 211 is connected to the lower arm of the first power amplifier speaker 202. Specifically, playback component 2 is a component capable of playing audio. The housing 201 provides protection for various internal components. The first power amplifier speaker 202 amplifies weak electrical signals from the signal source and emits sound, combining the functions of the amplifier and speaker. The energy storage device 203 stores and converts electrical energy, allowing the audio equipment to operate normally even without a direct power connection. The adjustment device 204 precisely adjusts the quiescent current of the audio amplifier, ensuring it always operates at its designed operating state, reducing performance changes caused by quiescent current variations, and better protecting the amplifier from overheating. The digital potentiometer 209 uses a digital control method to adjust the resistance value, offering flexibility, high adjustment precision, and contactless operation. It boasts significant advantages such as low noise, resistance to contamination, vibration resistance, interference resistance, small size, and long lifespan. Controlled by digital input, it generates an analog output and allows for current adjustment within the range of hundreds of microamps to several milliamps, depending on specific application requirements. The seventh resistor, R7, has its own resistance value, providing circuit protection. In practical applications, a 1000Ω resistor is commonly used, as its high resistance limits the current to a very small range. The seventh NPN transistor, T7, functions as both a current amplifier and a switch, converting weak electrical signals into signals of a certain strength. A common model is BC847CLT1. Connecting the upper terminal 210 and the lower terminal 211, it connects to the first power amplifier speaker 202, transmitting the actual voltage value between the upper and lower arms of the first power amplifier speaker 202 in real time.

[0025] The adjustment terminal of the adjustment device 204 includes a numerical control module 206, a first low-pass filter 207, a second low-pass filter 208, a fifth resistor R5, a sixth resistor R6, a microcontroller unit (MCU), a first NPN transistor T1, and a second PNP transistor T2. The upper end of the numerical control module 206 is connected to the base of the first NPN transistor T1, and the lower end of the numerical control module 206 is connected to the base of the second PNP transistor T2. The emitter of the first NPN transistor T1 is connected to the base of the second PNP transistor T2. The left end of a low-pass filter 207 is connected to the upper end of the sixth resistor R6. The lower end of the sixth resistor R6 is connected to the upper end of the fifth resistor R5. The lower end of the fifth resistor R5 is connected to the emitter of the second PNP transistor T2 and the left end of the second low-pass filter 208. The right end of the first low-pass filter 207 is connected to the IN+ interface of the microcontroller unit (MCU). The second low-pass filter 208 is connected to the IN- interface of the microcontroller unit (MCU). The microcontroller unit (MCU) is connected to the digital potentiometer 209.Specifically, multiple components inside the adjustment device 204 work together to adjust the static current of the first power amplifier speaker 202 in real time. The microcontroller unit (MCU) appropriately reduces the frequency and specifications of the central processing unit and integrates peripheral interfaces such as memory, counter, USB, A / D conversion, UART, PLC, DMA, and LCD driver circuits onto a single chip, forming a chip-level computer. It can collect and analyze the current of the first power amplifier speaker 202 and control multiple other components in combination. The first low-pass filter 207 and the second low-pass filter 208 allow low-frequency signals to pass normally, while high-frequency signals exceeding the set threshold are blocked or weakened. However, the degree of blocking or weakening will change according to different frequencies and different filtering programs. Users can adjust according to specific usage conditions to block high-frequency audio signals of the first power amplifier speaker 202 during normal operation, while allowing normal input and output of low-frequency signals. The fifth resistor R5 and the sixth resistor R6 have their own resistance values, which can protect the circuit and assist the microcontroller unit (MCU). In practical applications, resistor R6 is typically a 2.2Ω resistor, providing the basis for calculations of various circuit values. The first NPN transistor T1 and the second PNP transistor T2 amplify current and act as switches, converting weak electrical signals into signals of a certain strength and limiting current flow. Common models for the first NPN transistor T1 are BD139, and for the second PNP transistor T2 are BD140. The adjustment device 204 obtains the actual voltage value between the upper and lower arms of the power amplifier through differential ADC sampling, allowing it to adjust the output voltage accordingly. The current quiescent current is calculated from the resistance value, and then the quiescent current is adjusted by controlling the digital control module. Because the ADC and digital potentiometer are highly accurate, the required quiescent current value can be adjusted with high precision. In order to monitor the quiescent current value normally when the power amplifier is working normally, a low-pass filter module is added before the ADC input to filter out the audio signal. Alternatively, digital filtering or FFT technology can be used to process the data after sampling. Digital filtering also has the advantages of high precision, high reliability, programmable changeability or multiplexing, and easy integration to obtain the actual quiescent current value.

[0026] A support component 1 is provided behind the playback component 2. The support component 1 includes a Y-shaped support frame 101, which is connected to the housing 201. A placement slot 105 is provided above the Y-shaped support frame 101, and a wearable component 3 is provided on the placement slot 105. A rotating connector 102 is provided below the Y-shaped support frame 101, and a support base plate 103 is provided below the rotating connector 102. The support base plate 103 is rotatably connected to the Y-shaped support frame 101 through the rotating connector 102. A limiting rib 104 is provided on the Y-shaped support frame 101. Specifically, the support assembly 1 provides installation positions for multiple components. The Y-shaped support frame 101 is used to fix the housing 201 to prevent it from tipping over when placed on a table. The placement slot 105 provides an installation position for the wearable component 3. The support base plate 103 provides bottom support for the entire speaker. The support base plate 103 is rotatably connected to the Y-shaped support frame 101 through the rotating connector 102. The user can adjust the tilt angle between the Y-shaped support frame 101 and the support base plate 103 during use and adjust the sound direction of the speaker at any time. The limiting rib 104 can limit the angle between the support base plate 103 and the Y-shaped support frame 101 to prevent the entire speaker from tipping over due to the shift of the center of gravity if the included angle between the support base plate 103 and the Y-shaped support frame 101 is too small.

[0027] Wearable component 3 includes a clamp arm 301, with sliding grooves 311 on both inner sides of the clamp arm 301. A telescopic arm 302 is provided in the sliding grooves 311, and the telescopic arm 302 is slidably connected to the clamp arm 301. A pivot 303 is provided at the lower end of the telescopic arm 302, and an ear cover 304 is provided on the pivot 303. The ear cover 304 is rotatably connected to the telescopic arm 302 through the pivot 303. A soft pad 305 is provided on the outer side of the ear cover 304, and a second power amplifier speaker 306 is provided in the center of the soft pad 305. A receiving device 307 is provided inside the second power amplifier speaker 306. A power storage device 308 is provided on the ear cover 304. A magnetic charging contact 205 is provided on both sides of the power storage device 303, and the power storage device 308 can be connected to the magnetic charging contact 205. Specifically, the wearable component 3 is a component that the user can wear on their head. The telescopic arm 302 and the clamp arm 301 are slidably connected, allowing the user to put the clamp arm 301 on their head. The user can adjust the position of the telescopic arm 302 and the clamp arm 301 according to their head size, so that the earcups 304 can cover the user's ears. The soft pad 305 is elastic and directly contacts the user's ears, ensuring comfort. The earcups 304 are rotatably connected to the telescopic arm 302 via a pivot 303. When the user wants to wear it, they first remove the wearable component 3 from the placement slot 105, then rotate both earcups 304 180 degrees and put them on their head. The receiving device 307 can receive the electrical signals emitted by the playback component 2 and then transmit the electrical signals to the second power amplifier speaker 306. In the current state, the power amplifier speaker 306 adjusts the signal level to a volume suitable for close to the human ear. When the user is not wearing it, the wearable component 3 is placed outside the playback component 2. The second power amplifier speaker 306 will work in conjunction with the first power amplifier speaker 202 to form a sound group. The second power amplifier speaker 306 will adjust the signal level to a volume suitable for external playback and play in tandem with the first power amplifier speaker 202 to form a stereo sound effect, which can further enhance the user experience. When the wearable component 3 is placed outside the playback component 2, the power storage device 308 on the earcup shell 304 is connected to the magnetic charging protrusion 205 on the energy storage device 203. The energy storage device 203 provides power to the power storage device 308, so that the wearable component 3 can be used wirelessly during the user's wearing process.

[0028] Both sides of the clamping arm 301 are provided with buckles 309, which are rotatably connected to the clamping arm 301. The telescopic arm 302 is provided with a slot 310 on the outside. The buckle 309 is provided with a protrusion with the same groove shape as the slot 310 below it. The protrusion of the buckle 309 can be placed in the slot 310 and the two fit together. Specifically, the telescopic arm 302 has a slot 310 on its outer side, and the buckle 309 has a protrusion with the same groove shape as the slot 310 below it. The protrusion of the buckle 309 can be placed in the slot 310 and the two are interlocked. When the protrusion of the buckle 309 is placed in the slot 310, it can lock the position between the clamp arm 301 and the telescopic arm 302, preventing relative sliding between the telescopic arm 302 and the clamp arm 301. This ensures that the wearable component 3 will not move during the user's wearing process, causing relative displacement between the telescopic arm 302 and the clamp arm 301. When the user wants to adjust the wearable component 3, he / she can press one end of the buckle 309, causing the protrusion of the buckle 309 to lift up and disengage from the slot 310. At that time, the user can adjust the relative position between the telescopic arm 302 and the clamp arm 301 so that the wearable component 3 fits the user.

[0029] A method for regulating the quiescent current of an audio power amplifier includes the following steps: S1. Differential ADC Sampling: The ADC circuit consists of multiple components, including the microcontroller unit (MCU), upper terminal 210, lower terminal 211, seventh NPN transistor T7, seventh resistor R7, and digital potentiometer 209. After power-on, the upper terminal 210 and lower terminal 211 transmit the actual voltage value between the upper and lower arms of the first power amplifier speaker 202 to the microcontroller unit (MCU). In the sampling state, the switch is turned on, and the microcontroller unit (MCU) tracks the level change of the analog input signal until the hold signal arrives. In the hold state, the switch is turned off, the tracking process stops, and the microcontroller unit (MCU) holds the instantaneous value of the input signal before the switch is turned off. The current static current is calculated based on the current resistance value of the seventh resistor R7 and the digital potentiometer 209.

[0030] S2. Current Regulation: The numerical control module 206 obtains the current static current from the microcontroller unit (MCU), and then controls the magnitude of the static current. The regulated current is output to the MCU through the first NPN transistor T1. After the current is emitted from the emitter of the first NPN transistor T1, it passes through the first low-pass filter 207. In order to monitor the value of the static current normally when the first power amplifier speaker 202 is working normally, the first low-pass filter 207 is added before the ADC input to filter out high-frequency audio signals. The first low-pass filter 207 allows the regulated low-frequency signal to pass normally, while high-frequency signals exceeding the threshold value set by the first low-pass filter 207 are blocked and weakened. Then, the MCU controls the digital potentiometer 209 to adjust the resistance value of the digital potentiometer 209 with high precision, further adjusting the current magnitude, and then transmitting it to the first power amplifier speaker 202 to ensure that the first power amplifier speaker 202 always works in the designed working state and reduces the performance changes caused by static current changes.

[0031] The above are merely embodiments of the present invention. Commonly known structures and characteristics of the solutions are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. An audio device, characterized in that: The system includes a playback component (2), which includes a housing (201). Two first power amplifier speakers (202) are located on the outside of the housing (201). An energy storage device (203) is located inside the housing (201). An adjustment device (204) is located inside the housing (201). The sampling terminal of the adjustment device (204) includes a digital potentiometer (209), a seventh resistor (R7), a seventh NPN transistor (T7), an upper connection (210), and a lower connection (211). The upper end of the digital potentiometer (209) is connected to the upper connection (210). The lower end of potentiometer (209) is connected to the base of the seventh NPN transistor (T7) and the upper end of the seventh resistor (R7). The lower end of the seventh resistor (R7) is connected to the emitter of the seventh NPN transistor (T7) and the lower connection (211). The collector of the seventh NPN transistor (T7) is connected to the upper connection (210). The emitter of the seventh NPN transistor (T7) is connected to the lower connection (211). The upper connection (210) is connected to the upper arm of the first power amplifier speaker (202). The lower connection (211) is connected to the lower arm of the first power amplifier speaker (202).

2. The audio device as described in claim 1, characterized in that: The adjustment terminal of the adjustment device (204) includes a numerical control module (206), a first low-pass filter (207), a second low-pass filter (208), a fifth resistor (R5), a sixth resistor (R6), a microcontroller unit (MCU), a first NPN transistor (T1), and a second PNP transistor (T2). The upper end of the numerical control module (206) is connected to the base of the first NPN transistor (T1), and the lower end of the numerical control module (206) is connected to the base of the second PNP transistor (T2). The emitter of the first NPN transistor (T1) is connected to the first... The left end of the low-pass filter (207) is connected to the upper end of the sixth resistor (R6), the lower end of the sixth resistor (R6) is connected to the upper end of the fifth resistor (R5), the lower end of the fifth resistor (R5) is connected to the emitter of the second PNP transistor (T2), the left end of the second low-pass filter (208), the right end of the first low-pass filter (207) is connected to the IN+ interface of the microcontroller unit (MCU), the right end of the second low-pass filter (208) is connected to the IN- interface of the microcontroller unit (MCU), and the microcontroller unit (MCU) is connected to the digital potentiometer (209).

3. The audio device as described in claim 1, characterized in that: The playback component (2) is provided with a support component (1) at the rear. The support component (1) includes a Y-shaped support frame (101). The Y-shaped support frame (101) is connected to the housing (201). The Y-shaped support frame (101) is provided with a placement slot (105) above it. The placement slot (105) is provided with a wearable component (3). The Y-shaped support frame (101) is provided with a rotating connector (102) below it. The rotating connector (102) is provided with a support base plate (103) below it. The support base plate (103) is rotatably connected to the Y-shaped support frame (101) through the rotating connector (102). The Y-shaped support frame (101) is provided with a limiting rib (104).

4. The audio device as described in claim 3, characterized in that: The wearable component (3) includes a clamp arm (301), with sliding grooves (311) on both inner sides of the clamp arm (301). A telescopic arm (302) is provided in the sliding groove (311), and the telescopic arm (302) is slidably connected to the clamp arm (301). A rotating shaft (303) is provided at the lower end of the telescopic arm (302), and an ear cover (304) is provided on the rotating shaft (303). The ear cover (304) rotates with the telescopic arm (302) through the rotating shaft (303). The earcup shell (304) is provided with a soft pad (305) on the outside, a second power amplifier speaker (306) is provided in the center of the soft pad (305), a receiving device (307) is provided inside the second power amplifier speaker (306), an energy storage device (308) is provided on the earcup shell (304), and an adsorption charging synapse (205) is provided on both sides of the energy storage device (203), and the energy storage device (308) can be connected to the adsorption charging synapse (205).

5. The audio device as described in claim 4, characterized in that: Both sides of the clamping arm (301) are provided with buckles (309), the buckles (309) are rotatably connected to the clamping arm (301), the telescopic arm (302) is provided with a slot (310) on the outside, and the buckles (309) are provided with a protrusion with the same groove shape as the slot (310) below them. The protrusion of the buckles (309) can be placed in the slot (310) and the two are interlocked.

6. A method for adjusting the static current of an audio power amplifier, characterized in that: Includes the following steps: S1. Differential ADC Sampling: The ADC circuit consists of multiple components such as the microcontroller unit (MCU), upper connection (210), lower connection (211), seventh NPN transistor (T7), seventh resistor (R7), and digital potentiometer (209). After power-on, the upper connection (210) and lower connection (211) transmit the actual voltage value between the upper and lower arms of the first power amplifier speaker (202) to the microcontroller unit (MCU). In the sampling state, the switch is turned on, and the microcontroller unit (MCU) tracks the level change of the analog input signal until the hold signal arrives. In the hold state, the switch is turned off, the tracking process stops, and the microcontroller unit (MCU) holds the instantaneous value of the input signal before the switch is turned off. The current static current is calculated based on the current resistance value of the seventh resistor (R7) and the digital potentiometer (209). S2. Current Regulation: The numerical control module (206) obtains the current static current from the microcontroller unit (MCU), and then controls the magnitude of the static current. The numerical control module (206) outputs the regulated current to the microcontroller unit (MCU) through the first NPN transistor (T1). The current is emitted from the emitter of the first NPN transistor (T1) and passes through the first low-pass filter (207). In order to monitor the value of the static current normally when the first power amplifier speaker (202) is working normally, the first low-pass filter (207) is added before the ADC input to filter out high-frequency audio signals. The first low-pass filter (207) allows the regulated low-frequency signal to pass normally, while the high-frequency signal exceeding the threshold value set by the first low-pass filter (207) is blocked and weakened. Then the microcontroller unit (MCU) controls the digital potentiometer (209) to adjust the resistance value of the digital potentiometer (209) with high precision, further adjusting the current magnitude, and then transmitting it to the first power amplifier speaker (202) to ensure that the first power amplifier speaker (202) always works in the designed working state and reduces the performance changes caused by the static current change.

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