Switch mute circuit

Abstract

The switch mute circuit provided by the utility model comprises a microprocessor module, a voltage stabilizing module, a power-on control module, a power-off control module and an optocoupler module, the microprocessor module is used for generating a first equipment control signal, and the first equipment control signal is used for controlling the working state of the startup control module; a voltage-regulator tube is introduced into the circuit, so that stable output voltage can still be provided when the voltage of the power supply fluctuates, and misoperation caused by voltage fluctuation is avoided. Even if the large dynamic audio is played or the power supply voltage is slightly changed, the audio equipment can still keep a stable working state, and audio interruption or other abnormal conditions do not occur. Audio interruption or noise caused by voltage fluctuation or voltage drop in the shutdown process of the equipment is avoided, and the auditory experience of a user is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic circuits, in particular to a switch mute circuit. Background Art

[0002] In modern electronic devices, audio control during the startup and shutdown processes is an important part of the user experience. Especially when the device is starting up and shutting down, noise or interference is usually generated, which not only affects the user experience but may also damage subsequent audio devices or speakers.

[0003] However, the existing technology has certain limitations in practical applications. For example, in a voltage sag test or when playing audio content with a large dynamic range, the instantaneous power demand of the system may suddenly increase. If the power supply is unstable or the power supply capacity is insufficient, this instantaneous high power demand may cause a voltage drop. In this case, the mute circuit may be wrongly triggered, resulting in unnecessary muting or audio interruption during normal operation of the device.

[0004] In summary, the defects in the existing technology urgently need to be solved. Summary of the Utility Model

[0005] The utility model provides a switch mute circuit to solve the defects in the existing technology, achieve the continuity of audio output, avoid audio interruption or interference caused by voltage fluctuations or voltage drops during the device shutdown process, and further improve the user's auditory experience.

[0006] The utility model provides a switch mute circuit, including: a microprocessor module, a voltage regulation module, a startup control module, a shutdown control module, and an optocoupler module;

[0007] The microprocessor module is used to generate a first device control signal, and the first device control signal is used to control the working state of the startup control module;

[0008] The startup control module is used to generate a device control signal according to the first device control signal;

[0009] The voltage regulation module is used to provide a second device control signal for the shutdown control module, and the second device control signal is within a preset voltage range;

[0010] The shutdown control module is used to generate a mute control signal according to the second device control signal;

[0011] The optocoupler module is used to control the working state of the subsequent power amplifier circuit through the device control signal and the mute control signal;

[0012] The output end of the microprocessor module is connected to the input end of the power-on control module, and the output end of the power-on control module is connected to the first input end of the optocoupler module; the output end of the power-off control module is connected to the second input end of the optocoupler module; a voltage stabilization module is arranged at the input end of the power-off control module.

[0013] According to a switch mute circuit provided by the present invention, the switch mute circuit further includes a power supply module;

[0014] The power supply module is used to provide voltage for the microprocessor module, the voltage stabilization module and the power-off control module.

[0015] According to a switch mute circuit provided by the present invention, generating a device control signal according to the first device control signal specifically includes:

[0016] When the first device control signal is at a low level, the optocoupler module is turned on, and the post-stage power amplifier circuit is in an on state;

[0017] When the first device control signal is at a high level, the optocoupler module is not turned on, and the post-stage power amplifier circuit is in an off state.

[0018] According to a switch mute circuit provided by the present invention, the preset voltage range is 80%-90% of the power supply voltage of the power supply module.

[0019] According to a switch mute circuit provided by the present invention, the power-on control module includes a first triode and a second triode. When the first device control signal is at a low level, both the first triode and the second triode are turned on to turn on the optocoupler module.

[0020] According to a switch mute circuit provided by the present invention, the power-off control module includes a capacitor, a third triode and a fourth triode. After the power supply module is powered off, the capacitor discharges through the fourth triode to turn on the third triode to turn on the optocoupler.

[0021] The switch mute circuit provided by the present invention introduces a voltage stabilizing diode in the circuit to ensure a stable output voltage can still be provided when the power supply voltage fluctuates, and avoid malfunction caused by voltage fluctuation. Even when playing large-dynamic audio or the power supply voltage changes slightly, the audio device can still maintain a stable working state without audio interruption or other abnormal conditions. It avoids audio interruption or noise caused by voltage fluctuation or voltage drop during the device shutdown process, and further improves the user's auditory experience. Description of the Drawings

[0022] To more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 is a schematic diagram of the modules of the switch mute circuit provided by the present invention;

[0024] Figure 2 is the electronic circuit diagram of the switch mute circuit provided by the present invention. Detailed implementation manners

[0025] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention with reference to the drawings in the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0026] To solve the problems in the prior art, the present invention proposes a switch mute circuit to achieve the continuity of audio output and avoid audio interruption or noise caused by voltage fluctuations or voltage drops during the device shutdown process. The following describes this switch mute circuit, as Figure 1 and Figure 2 shown, including but not limited to the following modules:

[0027] A microprocessor module 110, a voltage stabilization module 120, a power-on control module 130, a power-off control module 140, and an optocoupler module 150;

[0028] The microprocessor module is used to generate a first device control signal, and the first device control signal is used to control the working state of the power-on control module;

[0029] The power-on control module is used to generate a device control signal according to the first device control signal;

[0030] The voltage stabilization module is used to provide a second device control signal for the power-off control module, and the second device control signal is within a preset voltage range;

[0031] The power-off control module is used to generate a mute control signal according to the second device control signal;

[0032] The optocoupler module is used to control the operating state of the subsequent power amplifier circuit through the device control signal and the mute control signal;

[0033] The output end of the microprocessor module is connected to the input end of the power-on control module, and the output end of the power-on control module is connected to the first input end of the optocoupler module; the output end of the power-off control module is connected to the second input end of the optocoupler module; a voltage stabilization module is arranged at the input end of the power-off control module.

[0034] The microprocessor module 110 is used to generate a first device control signal. This first device control signal can be a high-level or low-level signal, depending on the current operating state requirements of the device. Specifically, the microprocessor module 110 decides when to trigger the power-on or power-off process of the device according to the user's operation or preset logical conditions, and sends this control signal to the input end of the power-on control module 130 through the output end.

[0035] The power-on control module 130 receives the first device control signal from the microprocessor module 110 and generates a device control signal according to this signal. When the microprocessor module 110 outputs a low-level signal, the switching tube inside the power-on control module 130 conducts, generating an effective device control signal. This device control signal is transmitted to the first input end of the optocoupler module 150 through the output end to control the startup of the subsequent power amplifier circuit.

[0036] The voltage stabilization module 120 is connected to the input end of the power-off control module 140 and is used to provide a second device control signal for the power-off control module 140. This second device control signal is within a preset voltage range to ensure that the voltage is stable and reliable during the power-off process, and there will be no false triggering or abnormal device shutdown due to voltage fluctuations. The voltage stabilization module 120 maintains the stability of the input voltage by selecting voltage regulator components within a specific voltage range, especially during voltage dip tests or the playback of large dynamic audio signals.

[0037] The power-off control module 140 receives the second device control signal from the voltage stabilization module 120 and generates a mute control signal according to this signal. When the power-off control module 140 senses that the power supply voltage starts to drop or the device is about to shut down, it will cut off the audio signal path in advance and trigger the subsequent power amplifier circuit to enter the mute state through the optocoupler module 150 to avoid generating noise or crosstalk during the power-off process.

[0038] The first input terminal of the optocoupler module 150 is connected to the output terminal of the power-on control module 130, and the second input terminal is connected to the output terminal of the power-off control module 140. The optocoupler module 150 controls the operating state of the subsequent power amplifier circuit by receiving the device control signal and the mute control signal. Specifically, when receiving the device control signal from the power-on control module 130, the optocoupler module 150 conducts, enabling the power amplifier circuit to start; when receiving the mute control signal from the power-off control module 140, the optocoupler module 150 enters the conducting state, placing the power amplifier circuit in the mute or off state to ensure smooth and noise-free audio output when the device is powered off.

[0039] As a further optional embodiment, the switch mute circuit further includes a power supply module;

[0040] The power supply module 160 is used to supply voltage to the microprocessor module, the voltage regulator module, and the power-off control module.

[0041] The power supply module 160 is designed as an independent power management unit, capable of providing a stable voltage supply to the microprocessor module 110, the voltage regulator module 120, and the power-off control module 140. The power supply module is connected to the power source and converts the input voltage into the operating voltage suitable for each module through an internal power regulation circuit.

[0042] The power supply module first adjusts the external power supply voltage to the operating voltage suitable for the microprocessor module 110 and is connected to the microprocessor module 110 through a dedicated power output terminal to ensure that the microprocessor can normally generate and output the first device control signal.

[0043] At the same time, the power supply module also provides the input voltage to the voltage regulator module 120. After receiving the voltage, the voltage regulator module 120 further adjusts it to the stable voltage required for the second device control signal and transmits this signal to the power-off control module 140.

[0044] As a further optional embodiment, generating the device control signal according to the first device control signal specifically includes:

[0045] When the first device control signal is at a low level, the optocoupler module conducts, and the subsequent power amplifier circuit is in the on state;

[0046] When the first device control signal is at a high level, the optocoupler module does not conduct, and the subsequent power amplifier circuit is in the off state.

[0047] When the first device control signal generated by the microprocessor module 110 is at a low level, the switching transistors (such as Q1 and Q2) in the power-on control module 130 will conduct, generating a valid device control signal. At this time, the optocoupler module 150 conducts, allowing current to pass through. The light-emitting diode (LED) inside the optocoupler U1 is activated, generating an optical signal, which is transmitted to the output end of the optocoupler module through photoelectric coupling, thus triggering the subsequent power amplifier circuit to enter the on state. At this time, the audio device starts to work normally and can output audio signals.

[0048] When the first device control signal generated by the microprocessor module 110 is at a high level, the switching transistors in the power-on control module 130 will cut off, and the device control signal will not be generated or transmitted to the optocoupler module 150. At this time, the optocoupler module 150 does not conduct, the internal LED is not activated, the optical signal cannot be generated or transmitted, and the subsequent power amplifier circuit is in the off state. The device enters the mute or standby state, and the audio output stops.

[0049] As a further optional embodiment, the preset voltage range is 80% - 90% of the supply voltage of the power supply module.

[0050] The voltage regulation module 120 is used to provide a stable second device control signal for the shutdown control module 140. In this embodiment, in order to ensure that the shutdown control module can operate stably under different power supply conditions, the voltage regulation module presets the voltage range of the second device control signal to 80% - 90% of the supply voltage provided by the power supply module. For example, if the output voltage of the power supply module is 5V, then the voltage range of the second device control signal will be limited between 4V and 4.5V.

[0051] As a further optional embodiment, the power-on control module includes a first triode and a second triode. When the first device control signal is at a low level, both the first triode and the second triode conduct, so that the optocoupler module conducts.

[0052] The power-on control module 130 includes a first triode Q1 and a second triode Q2, which are used to receive the first device control signal from the microprocessor module 110. The two triodes are PNP type and NPN type respectively, and cooperate with each other to control the optocoupler module 150.

[0053] The first device control signal output by the microprocessor module 110 is at a low level. At this time, the first triode (PNP type) conducts, allowing current to pass through its emitter and base, and further triggering the conduction of the second triode (NPN type). With the conduction of the second triode, current passes through its collector and emitter, increasing the potential difference in the circuit, and then triggering the conduction of the optocoupler module 150. After the optocoupler module conducts, the LED inside it emits light, and the optical signal is transmitted to the optocoupler output terminal, controlling the subsequent power amplifier circuit to enter the on state.

[0054] The first device control signal output by the microprocessor module 110 is at a high level. At this time, the first triode (PNP type) is cut off, preventing current from flowing; without current passing through, the second triode (NPN type) also remains in the cut-off state. Since neither of the two triodes conducts, the optocoupler module 150 will not conduct either, and the subsequent power amplifier circuit therefore remains in the off state, and the device enters the mute or standby mode.

[0055] As a further optional embodiment, the shutdown control module includes a capacitor, a third triode, and a fourth triode. When the power supply module is powered off, the capacitor discharges through the fourth triode to conduct the third triode, so that the optocoupler conducts.

[0056] The shutdown control module 140 includes a capacitor, a third triode Q3 (PNP type), and a fourth triode Q4 (NPN type). The combination of these components is used to ensure that the optocoupler module 150 can conduct in time after the power supply module is powered off, so as to realize the control of the subsequent power amplifier circuit.

[0057] When the power supply module is supplying power normally, the capacitor is in a charged state, and both the third triode and the fourth triode in the shutdown control module are in the cut-off state. At this time, no current passes through the circuit.

[0058] When the power supply module is powered off, the capacitor starts to discharge. Since the discharge current of the capacitor passes through the fourth triode (NPN type), the fourth triode conducts accordingly. With the conduction of the fourth triode, current passes through its collector and emitter, thus generating a potential difference, which prompts the third triode (PNP type) to conduct.

[0059] After the third triode conducts, current further passes through its collector and emitter, generating a sufficient potential difference at the input end of the optocoupler module 150, and the LED inside the optocoupler module emits light, thus realizing the conduction of the optocoupler module. Through the capacitor discharge mechanism, the shutdown control module can delay the conduction of the optocoupler module after the power supply module is powered off. This design effectively prevents misoperations caused by instantaneous power outages or voltage fluctuations, improves the reliability of the system, ensures that the subsequent power amplifier circuit can smoothly transition to the off state, and avoids generating noise or other abnormal phenomena.

[0060] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A switch mute circuit, characterized in that, Including: A microprocessor module, a voltage stabilizing module, a power-on control module, a power-off control module, and an optocoupler module; The microprocessor module is used to generate a first device control signal, and the first device control signal is used to control the working state of the power-on control module; The power-on control module is used to generate a device control signal according to the first device control signal; The voltage stabilizing module is used to provide a second device control signal for the power-off control module, and the second device control signal is within a preset voltage range; The power-off control module is used to generate a mute control signal according to the second device control signal; The optocoupler module is used to control the working state of the subsequent power amplifier circuit through the device control signal and the mute control signal; The output end of the microprocessor module is connected to the input end of the power-on control module, and the output end of the power-on control module is connected to the first input end of the optocoupler module; the output end of the power-off control module is connected to the second input end of the optocoupler module; the input end of the power-off control module is provided with a voltage stabilizing module.

2. The switch mute circuit according to claim 1, characterized in that The switch mute circuit further includes a power supply module; The power supply module is used to provide voltage for the microprocessor module, the voltage stabilizing module, and the power-off control module.

3. The switch mute circuit according to claim 1, wherein Generating a device control signal according to the first device control signal specifically includes: When the first device control signal is at a low level, the optocoupler module is turned on, and the subsequent power amplifier circuit is in an on state; When the first device control signal is at a high level, the optocoupler module is not turned on, and the subsequent power amplifier circuit is in an off state.

4. The switch mute circuit according to claim 2, wherein The preset voltage range is 80%-90% of the supply voltage of the power supply module.

5. The switch mute circuit according to claim 1, wherein The power-on control module includes a first triode and a second triode. When the first device control signal is at a low level, both the first triode and the second triode are turned on to turn on the optocoupler module.

6. The switch mute circuit according to claim 2, wherein The power-off control module includes a capacitor, a third triode, and a fourth triode. When the power supply module is powered off, the capacitor discharges through the fourth triode to turn on the third triode to turn on the optocoupler.

Images