An external intelligent isolated power supply device for audio systems and its control method

Abstract

This invention relates to the field of audio power supply technology, and discloses an external intelligent isolated power supply device and its control method for audio systems. To address the lack of intelligent detection, dynamic switching, and noise reduction capabilities in existing power supply solutions, this invention's device includes units for external power input, energy storage, power switching, bypass detection, external operating status detection, and system control. The external operating status detection unit acquires wired or wireless status characteristic signals, and the system control unit executes the control method accordingly, controlling the power switching unit to switch between external and energy storage power supply; the bypass detection unit continuously monitors the input status during isolation to assist in stable recovery; and a discharge path series output voltage regulator unit provides a relatively constant and low-noise power supply. This invention is mainly used for power supply in vehicles and various types of audio systems.

Description

Technical Field

[0001] This invention relates to the field of audio power supply technology, and more particularly to an external intelligent isolated power supply device and its control method for audio systems. Specifically, this invention relates to an independent power supply device that can be used with external audio equipment. It achieves intelligent switching between external power supply and energy storage power supply by detecting the operating status of the external audio equipment and combining a power switching and bypass detection structure. Furthermore, an output voltage regulator unit can be configured in the energy storage discharge path to provide stable and low-noise power supply. Background Technology

[0002] In car audio and other audio applications, external audio equipment (such as in-vehicle DSPs, power amplifiers, and home DAC decoders) is highly sensitive to power supply quality. Traditional solutions typically use the vehicle's power system or a regular adapter to power external audio equipment, which is susceptible to alternator ripple, ignition transients, load fluctuations, and mains noise, thus negatively impacting the stability and sound performance of the audio system.

[0003] Some existing solutions attempt to power audio equipment using external batteries or power banks, but these solutions are mostly static power supply structures, lacking the ability to intelligently detect and dynamically switch based on the operating status of external audio equipment. Meanwhile, battery voltage fluctuates with charge levels during discharge, and directly powering external audio equipment may not meet the requirements of power-sensitive components such as DSPs, DACs, and power amplifiers for constant voltage and low noise ripple.

[0004] Furthermore, some existing technologies base their control logic on the audio processing unit within the device itself, thus focusing on integrated audio equipment and failing to cover the usage scenarios of independent external power supplies and external audio equipment. Therefore, there is an urgent need for an external intelligent isolated power supply device that protects independent power supplies, is compatible with multiple external status detection methods, possesses bypass detection and recovery capabilities, and can be optionally configured with a high-performance output voltage regulator. Summary of the Invention

[0005] (a) Technical problems to be solved The technical problem to be solved by the present invention is to provide an external intelligent isolated power supply device for an audio system, which can be used as an independent external power supply device in conjunction with external audio equipment; realize intelligent switching of power supply path by detecting the working status of external audio equipment; continue to detect external input status and stably restore it through bypass detection structure during the disconnection or isolation of the main power supply path; and reduce voltage fluctuation and ripple noise during battery discharge through optional output voltage regulation and filtering structure.

[0006] (II) Technical Solution To solve the above technical problems, the present invention adopts the following technical solution: an external intelligent isolated power supply device for an audio system, comprising an external power input unit (2), an energy storage unit (3), a power detection unit (4), a power switching unit (5), a bypass detection unit (6), an external working status detection unit (7), a system control unit (8), and an external power output unit (9); wherein: (1) the external power output unit (9) is used to electrically connect to an external audio device and supply power to the external audio device; (2) the external working status detection unit (7) is used to acquire a working status characteristic signal characterizing the working status of the external audio device and output the working status characteristic signal to the system control unit (8); (3) the system control unit (8) is connected to the power switching unit (5) and is used to control the power switching unit (5) to operate in at least two power supply modes according to the working status characteristic signal. Switching between states; the power switching unit (5) is electrically connected to the external power input unit (2), the energy storage unit (3) and the external power output unit (9) respectively, so that the external power output unit (9) can selectively form a power supply path with the external power input unit (2) or the energy storage unit (3); (4) the bypass detection unit (6) is connected to the external power input unit (2) and the system control unit (8), and is used to continuously detect the input state of the external power input unit (2) when the power switching unit (5) cuts off or isolates the main power supply path from external input to output, and outputs the detection result to the system control unit (8); (5) the power detection unit (4) is connected to the energy storage unit (3) and the system control unit (8), and is used to detect the power state of the energy storage unit (3) so that the system control unit (8) can perform power switching control.

[0007] Furthermore, the external working status detection unit (7) includes a status detection interface (10), which is used to receive the working status characteristic signal from an external audio device or a line related to the external audio device.

[0008] Furthermore, the operating status characteristic signal includes at least one of the following: remote control line level signal, current change characteristic signal in the power supply circuit of external audio equipment, voltage fluctuation or energy characteristic signal in audio signal line, wireless communication connection or digital data stream status signal, and other electrical characteristic signals characterizing the external audio equipment entering the operating state.

[0009] Furthermore, the power switching unit (5) includes a main power supply switch branch (11) and an energy storage power supply switch branch (12); the main power supply switch branch (11) is located between the external power input unit (2) and the external power output unit (9); the energy storage power supply switch branch (12) is located between the energy storage unit (3) and the external power output unit (9); the system control unit (8) is used to control the on and off states of the main power supply switch branch (11) and the energy storage power supply switch branch (12) to realize power supply path switching.

[0010] As an optional implementation, at least one of the main power supply switch branch (11) and the energy storage power supply switch branch (12) includes one or more combinations of the following switch structures: relay switch structure, metal oxide semiconductor field effect transistor switch structure, and solid-state switch structure.

[0011] Furthermore, the bypass detection unit (6) includes a bypass sampling branch (13) and a state determination branch (14). The bypass sampling branch (13) is connected to the external power input unit (2), and the state determination branch (14) is connected to the system control unit (8). It is used to detect the input voltage, level or state change of the external power input unit (2) and output the detection result when the main power supply path is disconnected or isolated.

[0012] As an optional implementation, the system control unit (8) is configured to perform a recovery determination based on the detection result of the bypass detection unit (6), and to introduce at least one of the following in the recovery determination: voltage threshold determination, delay determination, and sampling time window determination, so as to suppress the switching of the power supply path in the critical state.

[0013] Furthermore, an anti-backflow structure (15) is provided between the power switching unit (5) and the external power supply output unit (9). The anti-backflow structure (15) is used to restrict the reverse flow of electrical energy from the energy storage unit (3) or the external load side into the external power input unit (2).

[0014] Furthermore, the external working status detection unit (7) also includes a signal conditioning branch (16), which is used to filter, limit, match the potential or convert the working status characteristic signal before outputting it to the system control unit (8).

[0015] Furthermore, the power detection unit (4) is used to detect at least one of the voltage, current and remaining power information of the energy storage unit (3), and the system control unit (8) controls the power switching unit (5) to enter the energy storage power supply state, the energy storage power supply state, or the external input power supply state according to the power status.

[0016] Furthermore, the device also includes an output voltage regulator (19), which is connected in series on the discharge path between the energy storage unit (3) and the external power supply output unit (9) and is located on the output side of the energy storage power supply switch branch (12). The output voltage regulator (19) includes an ultra-low noise linear regulator or a low ripple DC-DC converter, which is used to regulate and filter the voltage output by the energy storage unit (3) and provide a regulated and low noise power supply voltage to the external audio equipment.

[0017] As an optional implementation, the output voltage regulator unit (19) includes a first-stage voltage regulator branch (20) and a second-stage linear voltage regulator branch (21). The first-stage voltage regulator branch (20) is used to perform primary voltage regulation on the output voltage of the energy storage unit (3), and the second-stage linear voltage regulator branch (21) is used to perform secondary linear voltage regulation and noise reduction on the voltage after primary voltage regulation.

[0018] As an optional implementation, the output voltage regulator unit (19) further includes an output filter branch (22), which is located between the secondary linear voltage regulator branch (21) and the external power supply output unit (9), or located at the output end of the output voltage regulator unit (19), for low-pass filtering, ripple suppression and transient suppression of the output voltage.

[0019] As an optional implementation, the output voltage regulator (19) includes an enable control terminal, and the system control unit (8) is connected to the enable control terminal to control the output voltage regulator (19) to start and stop synchronously or perform soft start during the power supply path switching process, so as to reduce the switching transient impact and the power-on noise of the audio equipment.

[0020] As an optional implementation, the output voltage regulator (19) further includes a feedback and voltage setting branch (23), which is used to set at least one of the output target voltage and to perform feedback regulation on the output voltage to adapt to the power supply requirements of different external audio devices.

[0021] As an optional implementation, the output voltage regulator (19) includes at least one of the following protection functions: undervoltage protection, overcurrent protection, overtemperature protection, and short circuit protection.

[0022] Furthermore, the external power supply output unit (9) includes an output interface (17), which is one or more combinations of a wire harness interface, a terminal interface, a plug interface, and a terminal block interface.

[0023] Furthermore, the device also includes an energy storage management unit (18), which is connected to the external power input unit (2), the energy storage unit (3) and the system control unit (8), and is used to perform charging management or protection management of the energy storage unit (3) when the external audio equipment is not in working state.

[0024] To address the aforementioned technical problems, this invention also provides an intelligent isolated power supply control method for an audio system, applied to the aforementioned external intelligent isolated power supply device. The method includes the following steps: Step S1, Status Detection and Main Power Supply Switching: The external working status detection unit acquires the working status characteristic signal that represents the working status of the external audio device; the system control unit determines that the external audio device has entered the working state according to the working status characteristic signal, controls the power switching unit to cut off or isolate the main power supply path from the external power input unit to the external power output unit, and controls the energy storage unit to supply power to the external power output unit. Step S2, Bypass monitoring during main path isolation: During the main power supply path disconnection or isolation, the bypass detection unit continuously monitors the input status of the external power input unit; Step S3, State Recovery Control: When the system control unit determines that the external audio device has exited the working state or meets the preset recovery conditions based on the detection result of the bypass detection unit, it controls the power switching unit to restore the power supply path of the external power input unit.

[0025] Furthermore, in step S3, the specific process of the system control unit performing state recovery control includes: based on the external power input voltage or level state collected by the bypass detection unit, at least one of voltage threshold determination, delay determination, and sampling time window determination is introduced to perform anti-jitter recovery determination, so as to suppress the reciprocating oscillation switching of the power supply path between energy storage power supply and external power supply in the critical state.

[0026] Furthermore, the device also includes an output voltage regulator unit, and the method further includes the following voltage regulation and noise reduction control steps: In step S1, when the system control unit controls the energy storage unit to supply power to the external power supply output unit, it synchronously controls the output voltage regulator unit to start or perform a soft start; after the output voltage regulator unit performs primary voltage conversion regulation and secondary linear voltage regulation and noise reduction processing on the voltage output by the energy storage unit, it provides a stable and low-noise power supply voltage to the external audio equipment.

[0027] (III) Beneficial Effects Compared with the prior art, the present invention has at least the following beneficial effects: (1) With independent external intelligent isolation power supply equipment as the protected object, it does not rely on the internal audio processing unit and can directly cover the commercial form of external power supply box; (2) Through the external working status detection unit (7) in conjunction with the system control unit (8) and the power switching unit (5), it can be compatible with multiple wake-up methods such as REM triggering, current change detection, and audio line detection, thereby enhancing versatility and anti-circumvention capabilities; (3) By using the bypass detection unit (6) to continuously detect the external input status during the isolation of the main power supply path, the recovery control is more stable and can suppress critical state jitter; (4) By setting an output voltage regulator unit (19) in the energy storage discharge path, the voltage fluctuation during the battery discharge process can be stabilized and noise reduced, providing a stable and low-noise power supply voltage to various audio equipment. (5) By combining first-stage voltage regulation, second-stage linear voltage regulation, output filtering and soft-start control, efficiency, low noise and smooth switching can be taken into account, and the engineering adaptability of various audio applications can be improved. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram illustrating the relationship between external operating status detection and power supply switching in this invention; Figure 3 This is a schematic diagram of the bypass detection and recovery control after the main power supply path is disconnected according to the present invention; Figure 4 These are schematic diagrams illustrating multiple embodiments of the external working status detection of the present invention; Figure 5 This is a schematic diagram of the anti-misjudgment and anti-oscillation structure of the present invention; Figure 6 This is a schematic diagram of an optional embodiment of the output voltage regulator unit of the present invention.

[0029] Figure 7 This is a flowchart illustrating the intelligent isolated power supply control method of the present invention.

[0030] 2-External power input unit; 3-Energy storage unit; 4-Power detection unit; 5-Power switching unit; 6-Bypass detection unit; 7-External operating status detection unit; 8-System control unit; 9-External power supply output unit; 10-Status detection interface; 11-Main power supply switch branch; 12-Energy storage power supply switch branch; 13-Bypass sampling branch; 14-State determination branch; 15-Anti-backflow structure; 16-Signal conditioning branch; 17-Output interface; 18-Energy storage management unit; 19-Output voltage regulator unit; 20-First-stage voltage regulator branch; 21-Second-stage linear voltage regulator branch; 22-Output filter branch; 23-Feedback and voltage setting branch. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments. The following embodiments are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0032] (I) Example 1: Overall Structure and Power Supply Switching like Figures 1 to 3 As shown, this device includes an external power input unit (2), an energy storage unit (3), a power detection unit (4), a power switching unit (5), a bypass detection unit (6), an external operating status detection unit (7), a system control unit (8), and an external power output unit (9). After the external operating status detection unit (7) collects the operating status characteristic signal, the system control unit (8) controls the power switching unit (5) to switch between the main power supply path and the energy storage power supply path.

[0033] When the system control unit (8) determines that the external audio equipment has entered the working state, it can cut off or isolate the main power supply path from the external power input to the external power supply output unit (9), and the energy storage unit (3) supplies power to the external power supply output unit (9) through the energy storage power supply switch branch (12); when the external audio equipment exits the working state or meets the recovery conditions, the external input power supply is restored or the charging management state is entered.

[0034] Furthermore, an anti-backflow structure (15) is provided between the power switching unit (5) and the external power supply output unit (9). The anti-backflow structure (15) is used to restrict the reverse flow of electrical energy from the energy storage unit (3) or the external load side into the external power input unit (2).

[0035] The external power supply output unit (9) includes an output interface (17), which is one or more combinations of a wire harness interface, a terminal interface, a plug interface, and a binding post interface, so as to facilitate flexible electrical connection with different types of external audio equipment.

[0036] In addition, the device also includes an energy storage management unit (18), which is connected to the external power input unit (2), the energy storage unit (3) and the system control unit (8). It is used to perform charging management or protection management on the energy storage unit (3) when the external audio equipment is not in working state, so as to extend the service life of the energy storage unit.

[0037] (II) Example 2: External Operating Status Detection like Figure 4 As shown, the operating status characteristic signal may come from the REM trigger line, the current change detection line, or the audio signal line. The external operating status detection unit (7) may include a status detection interface (10) and a signal conditioning branch (16) for performing filtering, limiting, potential matching, or level conversion before the signal input system control unit (8).

[0038] In specific circuit implementations, for the REM trigger line, the signal conditioning branch can use a voltage divider resistor network in conjunction with optocoupler isolation for level conversion; for current change detection, a milliohm-level sampling resistor can be connected in series with a current sensing amplifier (or a Hall current sensor can be used) to capture load current steps; for audio signal detection, an envelope detector circuit can be used to extract the DC envelope of the audio AC signal, and a comparator can be used for threshold determination; for wireless communication or digital signal detection, a low-power wireless receiver module (such as a StarScan short-range communication module or Bluetooth module) or a digital interface chip can be configured to monitor or capture the wireless connection handshake and data stream activity status of external audio devices. The system control unit can be set to perform joint judgment of multiple signals or to prevent false judgments by continuously meeting threshold times.

[0039] (III) Example 3: Bypass Detection and Recovery Control like Figure 3 and Figure 5 As shown, the bypass detection unit (6) continuously detects the external power input status when the main power supply path is disconnected or isolated through the bypass sampling branch (13) and the status determination branch (14). The system control unit (8) can combine threshold, delay and sampling time window to perform recovery determination to suppress repeated switching.

[0040] In a typical parameter setting example, to adapt to the vehicle's 12V power supply system, the system control unit (8) can set the normal operating voltage threshold of the external power input to between 11.5V and 14.4V; when performing the recovery determination, the delay determination can be set to 200ms to 1000ms (e.g., preferably 500ms) to ensure that the external input voltage has stabilized through the transient fluctuation period; the sampling time window can be set to 50ms to 100ms to filter out high-frequency interference glitches. Of course, the above values ​​are only illustrative examples, and those skilled in the art can make corresponding adjustments according to the actual power supply requirements of the audio equipment (such as 5V, 9V, or 24V systems).

[0041] At the underlying timing of state switching, to avoid power supply conflicts, the system control unit (8) preferably adopts a "disconnect first, then connect" or dead-time control strategy. For example, when it is determined to restore external power supply, the energy storage power supply switch branch is first turned off, and after a dead time of several milliseconds, the main power supply switch branch is then turned on. Under boundary voltage or glitch pulse interference, by introducing the above-mentioned hysteresis voltage threshold and delay decision window, a complete anti-jitter state machine can be constructed to ensure that path restoration is only performed after the external input is truly stable.

[0042] (iv) Example 4: Output voltage regulator unit (performance enhancement) like Figure 6 As shown, an output voltage regulator (19) can be connected in series on the discharge path between the energy storage unit (3) and the external power supply output unit (9). The output voltage regulator (19) is preferably located on the output side of the energy storage power supply switch branch (12) to regulate and reduce the output voltage in the energy storage power supply mode.

[0043] The output voltage regulator unit (19) may include a first-stage voltage regulator branch (20) and a second-stage linear voltage regulator branch (21). The first-stage voltage regulator branch (20) may use a low-ripple DC-DC structure to perform primary voltage regulation of the battery voltage; the second-stage linear voltage regulator branch (21) may use an ultra-low noise LDO to perform secondary linear voltage regulation and noise reduction of the voltage after primary voltage regulation.

[0044] In a preferred embodiment, the output voltage regulator unit (19) may further include an output filter branch (22). The output filter branch (22) may employ an LC filter, a PI filter, or an equivalent filter network to further suppress ripple, switching noise, and load transient disturbances.

[0045] In another preferred embodiment, the output voltage regulator (19) includes a feedback and voltage setting branch (23) for setting the output target voltage and adjusting the output voltage to adapt to the power supply requirements of different external audio devices, such as 5V, 9V, 12V or other target voltages.

[0046] The system control unit (8) can be connected to the enable control terminal of the output voltage regulator unit (19) to control the output voltage regulator unit (19) to start and stop synchronously or perform soft start during the power supply path switching process, so as to reduce the transient impact of switching and reduce power-on noise. The output voltage regulator unit (19) may also include one or more of undervoltage protection, overcurrent protection, overtemperature protection and short circuit protection to improve system reliability.

[0047] In practical applications, the feedback and voltage setting branches can be flexibly set via DIP switches, jumpers, or digital potentiometers to various target output voltages, such as 5V / 9V for home portable DACs, 12V / 15V for desktop amplifiers, or 24V for automotive professional DSPs. Meanwhile, soft-start control specifically manifests as the system control unit controlling the enable (EN) terminal of the voltage regulator chip through PWM ramp control or RC delay network, allowing the output voltage to rise smoothly within milliseconds to tens of milliseconds, thereby effectively suppressing the 'bang' transient impact noise when the power-up audio equipment is powered on.

[0048] (V) Example 5: Control Method like Figure 7 As shown, the present invention also provides an intelligent isolated power supply control method for the above-mentioned equipment. The method mainly includes: step S1 state detection and main power supply switching; step S2 bypass monitoring during main path isolation; and step S3 state recovery control. Its specific control logic, anti-jitter judgment and voltage regulation and noise reduction linkage control are consistent with the action logic of the system control unit (8) in the aforementioned equipment embodiment. The detailed working principle has been fully explained in the aforementioned embodiment and will not be repeated here.

Claims

1. An external intelligent isolated power supply device for an audio system, characterized in that, The system includes an external power input unit (2), an energy storage unit (3), a power detection unit (4), a power switching unit (5), a bypass detection unit (6), an external working status detection unit (7), a system control unit (8), and an external power output unit (9); wherein: (1) the external power output unit (9) is used to electrically connect to an external audio device and supply power to the external audio device; (2) the external working status detection unit (7) is used to acquire a working status characteristic signal representing the working status of the external audio device and output the working status characteristic signal to the system control unit (8); (3) the system control unit (8) is connected to the power switching unit (5) and is used to control the power switching unit (5) to switch between at least two power supply states according to the working status characteristic signal; the power switching unit (5) is connected to the external audio device and the external power supply output unit (9); The external power input unit (2), the energy storage unit (3) and the external power output unit (9) are electrically connected so that the external power output unit (9) can selectively form a power supply path with the external power input unit (2) or the energy storage unit (3); (4) The bypass detection unit (6) is connected to the external power input unit (2) and the system control unit (8) and is used to continuously detect the input status of the external power input unit (2) when the power switching unit (5) cuts off or isolates the main power supply path from external input to output, and outputs the detection result to the system control unit (8); (5) The power detection unit (4) is connected to the energy storage unit (3) and the system control unit (8) and is used to detect the power status of the energy storage unit (3) so that the system control unit (8) can perform power switching control.

2. The external intelligent isolated power supply device according to claim 1, characterized in that, The external operating status detection unit (7) uses one or more of the following hardware circuit structures to extract the operating status feature signals: A voltage divider resistor network combined with an optocoupler isolation circuit is used to extract the remote control line level signal; A sampling resistor is used in conjunction with a current sensing amplifier or a Hall current sensor to extract the current change characteristic signal in the power supply circuit of an external audio device. An envelope detector circuit and a comparator are used to extract voltage fluctuations or energy characteristic signals in the audio signal line. Low-power wireless receiver modules or digital interface chips are used to monitor and extract wireless communication connection or digital data stream status signals.

3. The external intelligent isolated power supply device according to claim 1, characterized in that, The power switching unit (5) includes a main power supply switch branch (11) and an energy storage power supply switch branch (12), which are used to respond to the control of the system control unit (8) to realize the power supply path switching; and, an anti-backflow structure (15) is provided between the power switching unit (5) and the external power supply output unit (9) to restrict the reverse flow of electrical energy into the external power input unit (2).

4. The external intelligent isolated power supply device according to claim 1, characterized in that, The bypass detection unit (6) includes a bypass sampling branch (13) and a state determination branch (14), which are used to detect changes in input state when the main power supply path is disconnected or isolated; The system control unit (8) is configured to perform anti-shake recovery determination based on the detection result by introducing at least one of voltage threshold determination, delay determination, and sampling time window determination, so as to suppress repeated switching.

5. The external intelligent isolated power supply device according to claim 1, characterized in that, The power detection unit (4) is used to detect at least one of the voltage, current and remaining power information of the energy storage unit (3); and the device also includes an energy storage management unit (18) for charging management or protection management of the energy storage unit (3) when the external audio equipment is not in operation.

6. The external intelligent isolated power supply device according to claim 1, characterized in that, It also includes an output voltage regulator unit (19), which is connected in series on the discharge path between the energy storage unit (3) and the external power supply output unit (9); the output voltage regulator unit (19) includes a first-stage conversion voltage regulator branch (20) and a second-stage linear voltage regulator branch (21), which are used to perform primary conversion voltage regulation and secondary linear voltage regulation and noise reduction on the output voltage of the energy storage unit (3).

7. The external intelligent isolated power supply device according to claim 6, characterized in that, The device also has at least one of the following enhanced protection and output features (1) to (5): (1) It also includes an output filter branch (22) for low-pass filtering, ripple suppression and transient suppression of the output voltage; (2) The output voltage regulator unit (19) includes an enable control terminal, which is connected to the system control unit (8) to control synchronous start-up or perform soft start during power supply path switching. (3) The output voltage regulator unit (19) further includes a feedback and voltage setting branch (23) for setting the output target voltage and performing feedback regulation on the output voltage, at least one of the following: (4) The output voltage regulator unit (19) includes at least one of the following protection functions: undervoltage protection, overcurrent protection, overtemperature protection, and short circuit protection; (5) The external power supply output unit (9) includes an output interface (17), which is one or more combinations of wire harness interface, terminal interface, plug interface, and terminal block interface.

8. A method for controlling an intelligent isolated power supply for an audio system, characterized in that, Applied to any one of claims 1 to 7, the method comprises the following steps: Step S1, Status Detection and Main Power Supply Switching: The external working status detection unit (7) acquires the working status characteristic signal representing the working status of the external audio equipment; the system control unit (8) determines that the external audio equipment has entered the working state according to the working status characteristic signal, and when the power status of the energy storage unit (3) meets the preset power supply switching conditions, it controls the power switching unit (5) to cut off or isolate the main power supply path from the external power input unit (2) to the external power output unit (9), and controls the energy storage unit (3) to supply power to the external power output unit (9); Step S2, Bypass monitoring during main path isolation: During the main power supply path cut-off or isolation, the bypass detection unit (6) continuously detects the input status of the external power input unit (2); Step S3, State recovery control: When the system control unit (8) determines that the external audio equipment has exited the working state or meets the preset recovery conditions based on the detection result of the bypass detection unit (6), it controls the power switching unit (5) to restore the power supply path of the external power input unit (2).

9. The control method according to claim 8, characterized in that, In step S3, the specific process of the system control unit (8) performing state recovery control includes: based on the external power input voltage or level state collected by the bypass detection unit (6), at least one of voltage threshold determination, delay determination and sampling time window determination is introduced to perform anti-jitter recovery determination, so as to suppress the reciprocating oscillation switching of the power supply path between energy storage power supply and external power supply in the critical state.

10. The control method according to claim 8, characterized in that, The device further includes an output voltage regulator unit (19), and the method further includes the following voltage regulation and noise reduction control steps: In step S1, when the system control unit (8) controls the energy storage unit (3) to supply power to the external power supply output unit (9), the output voltage regulator unit (19) is simultaneously controlled to start or perform soft start; the output voltage regulator unit (19) performs primary voltage conversion and secondary linear voltage regulation and noise reduction processing on the voltage output by the energy storage unit (3) and then provides power supply voltage to the external audio equipment.

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