Power-down mute driving circuit and audio equipment

Abstract

The utility model relates to the field of circuit design, in particular to a power-down mute drive circuit and audio equipment. The power-down mute driving circuit comprises a temperature compensation module and a mute driving module comprising a first triode; an input end of the temperature compensation module is connected with a system power supply, an output end of the temperature compensation module is connected with a base electrode of the first triode, and an output end of the mute driving module is connected with a power amplifier of audio equipment; the temperature compensation module can be used for compensating the break-over voltage of the first triode, so that the amplitudes of the break-over voltage of the first triode at different environment temperatures are the same; and the mute driving module can be used for closing the first triode after voltage compensation when the system power supply is switched off, and driving a power amplifier of the audio equipment to be mute. By setting temperature compensation for the conduction voltage of the triode, the detection circuit is not influenced by temperature, and the noise condition generated in the power-down process is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit design, in particular to a power-off silent driving circuit and an audio device. Background Art

[0002] Power-off mute means that in an audio device, when the device is in a power-off state (that is, without power supply), the system will automatically enter a mute mode, that is, turn off or mute the output audio signal. This power-off mute function can protect the audio device from unexpected noise or damage, and also extend the service life of the device.

[0003] At present, BT speakers, wifi speakers, S-BARs and other types of audio equipment products will perform unplugging POP noise tests for the system power-off mute control link. POP noise refers to the popping sound caused by transient impacts caused by various operations when the audio device is powered on, powered off, and after the power is stable. However, since the product generates heat when working, the temperature change will cause the device characteristics to change, resulting in inaccurate detection and the inability to completely solve the POP noise.

[0004] The above contents are only used to assist in understanding the technical solution of the present utility model and do not constitute an admission that the above contents are prior art. Utility Model Content

[0005] The main purpose of the utility model is to provide a power-off silent driving circuit and an audio device, aiming to solve the technical problem in the prior art that the conduction voltage of the triode device decreases due to temperature changes, resulting in the inability to eliminate noise when the power is off.

[0006] To achieve the above object, the utility model provides a power-off silent driving circuit including a temperature compensation module and a silent driving module including a first triode;

[0007] The input end of the temperature compensation module is connected to the system power supply, the output end of the temperature compensation module is connected to the base of the first transistor, and the output end of the mute drive module is connected to the power amplifier of the audio device;

[0008] The temperature compensation module is used to compensate the on-state voltage of the first transistor so that the amplitude of the on-state voltage of the first transistor is the same at different ambient temperatures;

[0009] The mute driving module is used to turn off the first transistor after voltage compensation when the system power is disconnected, so as to drive the power amplifier of the audio device to mute.

[0010] Optionally, the mute driving module includes a driving control unit including the first triode and a driving transmission unit including the second triode;

[0011] The base of the first transistor is connected to the output end of the temperature compensation module, the output end of the drive control unit is connected to the input end of the drive transmission unit, and the output end of the drive transmission unit is connected to the power amplifier of the audio device;

[0012] The drive control unit is used to transmit the switch control signal to the drive transmission unit when the system power is disconnected;

[0013] The driving transmission unit is used to transmit a low-level mute signal to the power amplifier of the audio device to drive the power amplifier to mute when receiving the switch control signal.

[0014] Optionally, the driving control unit further includes a first resistor and a second resistor;

[0015] The first end of the first resistor is connected to the power supply, the second end of the first resistor is simultaneously connected to the collector of the first transistor, the first end of the second resistor and the input end of the drive transmission unit, the base of the first transistor is connected to the temperature compensation module, and the emitter of the first transistor and the second end of the second resistor are grounded.

[0016] Optionally, the temperature compensation module includes a third resistor, a fourth resistor and a third transistor;

[0017] The first end of the third resistor is connected to the system power supply, the base of the third transistor, and the collector of the third transistor at the same time, the second end of the third resistor is connected to the base of the first transistor, the emitter of the third transistor is connected to the first end of the fourth resistor, and the second end of the fourth resistor is grounded;

[0018] The resistance values ​​of the third resistor and the fourth resistor are equal.

[0019] Optionally, the drive transmission unit further includes a fifth resistor and a sixth resistor;

[0020] The first end of the fifth resistor is connected to the power supply, the second end of the fifth resistor is simultaneously connected to the collector of the second transistor, the first end of the sixth resistor and the power amplifier of the audio device, the base of the second transistor is connected to the collector of the first transistor, and the emitter of the second transistor and the second end of the sixth resistor are grounded.

[0021] Optionally, the silent driving module further includes a matching compensation unit;

[0022] The input end of the matching compensation unit is connected to the output end of the driving control unit, and the output end of the matching compensation unit is connected to the input end of the driving transmission unit;

[0023] The matching compensation unit is used to compensate the switch transmission characteristics of the second transistor so that the second transistor has the same switch transmission characteristics as the first transistor.

[0024] Optionally, the matching compensation unit includes a seventh resistor, an eighth resistor and a fourth transistor;

[0025] The first end of the seventh resistor is connected to the collector of the first transistor, the base of the fourth transistor, the collector of the fourth transistor and the first end of the second resistor at the same time, the second end of the seventh resistor is connected to the base of the second transistor, the emitter of the fourth transistor is connected to the first end of the eighth resistor, and the second end of the eighth resistor is grounded;

[0026] The seventh resistor and the eighth resistor have the same resistance value.

[0027] Optionally, the power-off silent driving circuit further includes a voltage division module;

[0028] The voltage dividing module is arranged between the system power supply and the temperature compensation module;

[0029] The voltage divider module is used to turn off the first transistor of the mute drive module when the system power is disconnected.

[0030] Optionally, the voltage dividing module includes a ninth resistor and a tenth resistor;

[0031] One end of the ninth resistor is connected to the system power supply, a second end of the ninth resistor is connected to the first end of the tenth resistor and the input end of the temperature compensation module, and a second end of the tenth resistor is grounded.

[0032] In addition, to achieve the above-mentioned purpose, the utility model also provides an audio device, and the audio device includes the above-mentioned power-off mute driving circuit.

[0033] The technical solution of the utility model proposes a power-off mute driving circuit and an audio device. The power-off mute driving circuit includes a temperature compensation module and a mute driving module including a first transistor; the input end of the temperature compensation module is connected to the system power supply, the output end of the temperature compensation module is connected to the base of the first transistor, and the output end of the mute driving module is connected to the power amplifier of the audio device; the temperature compensation module can be used to compensate the conduction voltage of the first transistor so that the amplitude of the conduction voltage of the first transistor is the same at different ambient temperatures; the mute driving module can be used to turn off the first transistor after voltage compensation when the system power is disconnected, and drive the power amplifier of the audio device to mute. By setting the temperature compensation for the conduction voltage of the transistor, the detection circuit will not be affected by temperature, and the noise condition occurring during the power-off process is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0035] Figure 1 This is a functional module diagram of the first embodiment of the power-off silent driving circuit of the utility model;

[0036] Figure 2 This is a circuit structure diagram of the second embodiment of the power-off silent driving circuit of the utility model;

[0037] Figure 3 This is a circuit structure diagram of the third embodiment of the power-off silent driving circuit of the utility model.

[0038] Description of Figure Numbers:

[0039] Label name Label name R1~R10 The first to tenth resistors 20 Silent drive module Q1~Q4 The first to fourth transistors 30 Voltage divider module VS System Power 201 Drive control unit VCC Power supply 202 Drive transmission unit 10 Temperature compensation module 203 Matching compensation unit

[0040] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0041] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0042] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0043] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0044] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0045] Reference Figure 1 , Figure 1 It is a functional module diagram of the first embodiment of the power-off silent driving circuit of the utility model.

[0046] The utility model provides a first embodiment of a power-off silent driving circuit.

[0047] In this embodiment, the power-off mute driving circuit includes a temperature compensation module 10 and a mute driving module 20 including a first transistor Q1. The input end of the temperature compensation module 10 is connected to the system power supply VS, the output end of the temperature compensation module 10 is connected to the base of the first transistor Q1, and the output end of the mute driving module 20 is connected to the power amplifier of the audio device.

[0048] It should be noted that the temperature compensation module 10 can be used to compensate for the on-state voltage of the first transistor Q1 so that the amplitude of the on-state voltage of the first transistor Q1 is the same at different ambient temperatures; the mute drive module 20 can be used to turn off the voltage-compensated first transistor Q1 when the system power supply VS is disconnected, so as to drive the power amplifier of the audio device to mute.

[0049] It should be understood that the mute drive module 20 may be an electronic device that controls the high and low level output conditions in response to the access status of the system power supply VS, and includes a first transistor Q1. When the system power supply VS is connected, the first transistor Q1 may be turned on, and the mute drive module 20 may generate a high level output signal to drive the power amplifier of the audio device to operate normally, or when the system power supply VS is disconnected, the first transistor Q1 may be turned off, and the mute drive module 20 may generate a low level output signal to drive the power amplifier of the audio device to mute, so as to achieve the function of eliminating POP noise.

[0050] The system power supply VS may be a power supply for the audio device. When the system power supply VS is disconnected, a preset detection voltage may be provided to power the power-off mute driving circuit to ensure that the power amplifier of the audio device can be driven to mute and avoid POP noise. The preset detection voltage may be a value that makes the base voltage value of the first transistor Q1 just at the cut-off voltage.

[0051] It should be noted that the working principle of the transistor is that the change of the base input current or voltage generates electron and hole pairs through the diffusion and drift of the space charge region. The electron and hole pairs enter the collector and emitter through diffusion and drift to form collector current and emitter current. The generation and diffusion of electron and hole pairs are easily affected by temperature, that is, as the temperature rises, the conduction voltage between the base and emitter of the transistor will decrease. As a result, the first transistor Q1, which should be turned off, is turned on when the system power supply VS is disconnected, and the mute drive module 20 generates a high-level output signal, driving the power amplifier of the audio device to run briefly to generate POP noise.

[0052] It should be understood that the temperature compensation module 10 can be provided at the base of the first transistor Q1 to clamp the on-voltage of the first transistor Q1 and compensate for the change in on-voltage drop caused by temperature increase.

[0053] This embodiment proposes a power-off mute driving circuit, which includes a temperature compensation module and a mute driving module including a first transistor; the input end of the temperature compensation module is connected to the system power supply VS, the output end of the temperature compensation module is connected to the base of the first transistor, and the output end of the mute driving module is connected to the power amplifier of the audio device; the temperature compensation module can be used to compensate the conduction voltage of the first transistor so that the amplitude of the conduction voltage of the first transistor is the same at different ambient temperatures; the mute driving module can be used to turn off the first transistor after voltage compensation when the system power supply VS is disconnected, and drive the power amplifier of the audio device to mute. By setting the temperature compensation for the conduction voltage of the transistor, the detection circuit will not be affected by temperature, and the noise condition occurring during the power-off process is reduced.

[0054] Reference Figure 2 , Figure 2 The circuit structure diagram of the second embodiment of the power-off silent driving circuit of the utility model is shown in FIG. Based on the first embodiment of the power-off silent driving circuit, the second embodiment of the power-off silent driving circuit of the utility model is proposed.

[0055] In this embodiment, the mute driving module 20 includes a driving control unit 201 including the first transistor Q1 and a driving transmission unit 202 including the second transistor Q2.

[0056] The base of the first transistor Q1 is connected to the output end of the temperature compensation module 10 , the output end of the driving control unit 201 is connected to the input end of the driving transmission unit 202 , and the output end of the driving transmission unit 202 is connected to the power amplifier of the audio device.

[0057] It should be noted that the drive control unit 201 can be used to transmit a switch control signal to the drive transmission unit 202 when the system power supply VS is disconnected; the drive transmission unit 202 can be used to transmit a low-level mute signal to the power amplifier of the audio device when receiving the switch control signal to drive the power amplifier to mute.

[0058] The switch control signal may be an electrical signal generated by the drive control unit 201 in response to the system power supply VS to drive the second transistor Q2 to turn on and off. The mute signal may be an electrical signal generated by the drive transmission unit 202 to drive the power amplifier of the audio device to operate or mute.

[0059] It should be understood that when the system power supply VS is connected, the first transistor Q1 is turned on, the mute driving module 20 generates a low-level switch control signal to drive the second transistor Q2 to turn off, and the drive transmission unit 202 generates a high-level mute signal to drive the power amplifier of the audio device to operate normally; when the system power supply VS is disconnected, the first transistor Q1 is turned off, the mute driving module 20 generates a high-level switch control signal to drive the second transistor Q2 to turn on, and the drive transmission unit 202 generates a low-level mute signal to drive the power amplifier of the audio device to mute.

[0060] Furthermore, the drive control unit 201 also includes a first resistor R1 and a second resistor R2; the first end of the first resistor R1 is connected to the power supply VCC (the voltage value can be set to 3.3V), the second end of the first resistor R1 is simultaneously connected to the collector of the first transistor Q1, the first end of the second resistor R2 and the input end of the drive transmission unit 202, the base of the first transistor Q1 is connected to the temperature compensation module 10, and the emitter of the first transistor Q1 and the second end of the second resistor R2 are grounded.

[0061] At this time, the temperature compensation module 10 includes a third resistor R3, a fourth resistor R4 and a third triode Q3; the first end of the third resistor R3 is simultaneously connected to the system power supply VS, the base of the third triode Q3, and the collector of the third triode Q3, the second end of the third resistor R3 is connected to the base of the first triode Q1, the emitter of the third triode Q3 is connected to the first end of the fourth resistor R4, and the second end of the fourth resistor R4 is grounded. The resistance values ​​of the third resistor R3 and the fourth resistor R4 are equal.

[0062] The base voltage of the first transistor Q1 satisfies VD=Vbe1+R4*I2=Vbe2+R3*I1, wherein VD is the base voltage of the first transistor Q1, Vbe1 is the on-voltage of the first transistor Q1, Vbe2 is the on-voltage of the third transistor Q3, R3 is the resistance of the third resistor, R4 is the resistance of the fourth resistor, I1 is the current value on the third resistor, and I2 is the current value on the fourth resistor. Since the resistance of the third resistor R3 and the fourth resistor R4 are the same, and the temperature of the first transistor Q1 and the third transistor Q3 has the same effect on the on-characteristics, when the system power supply VS is disconnected, the voltage value of the base of the first transistor Q1 can be maintained at the amplitude of the cut-off voltage. That is, the voltage division of the first transistor Q1 and the third resistor R3 is clamped by the third transistor Q3 and the fourth resistor R4.

[0063] Furthermore, the driving transmission unit 202 also includes a fifth resistor R5 and a sixth resistor R6; the first end of the fifth resistor R5 is connected to the power supply VCC, the second end of the fifth resistor R5 is simultaneously connected to the collector of the second transistor Q2, the first end of the sixth resistor R6 and the power amplifier of the audio device, the base of the second transistor Q2 is connected to the collector of the first transistor Q1, and the emitter of the second transistor Q2 and the second end of the sixth resistor R6 are grounded.

[0064] It should be noted that the base voltage of the second transistor Q2 remains at a low level when the first transistor Q1 is turned on, and the active power supply of the second transistor Q2 is determined by the voltage divided on the second resistor after the power supply VCC passes through the first resistor R1 and the second resistor R2 when the first transistor Q1 is turned off.

[0065] It should be understood that when the system power supply VS is normally connected, the voltage on the base of the first transistor Q1 exceeds the conduction voltage of the first transistor Q1, the first transistor Q1 is turned on, the voltage on the base of the second transistor Q2 is 0 at this time, the second transistor Q2 is turned off, and the voltage transmitted to the power amplifier of the audio device is a high-level signal. When the system power supply VS is powered off, the voltage on the base of the first transistor Q1 is maintained at the cut-off voltage of the first transistor Q1, the first transistor Q1 is turned off, the voltage on the base of the second transistor Q2 is a high level, the second transistor Q2 is turned on, and the voltage transmitted to the power amplifier of the audio device is a low-level signal.

[0066] In this embodiment, a driving control unit including the first transistor and a driving transmission unit including the second transistor are provided. The driving control unit is used to transmit a switch control signal to the driving transmission unit when the system power is disconnected; the driving transmission unit is used to transmit a low-level mute signal to the power amplifier of the audio device when receiving the switch control signal to drive the power amplifier to mute, and drive and control the power amplifier. By providing a temperature compensation module including a third resistor, a fourth resistor and a third transistor, the mute control is not affected by temperature changes, and the power amplifier mute function is achieved at a lower cost.

[0067] Reference Figure 3 , Figure 3 The third embodiment of the power-off silent driving circuit of the utility model is a circuit structure diagram. Based on the above embodiments of the power-off silent driving circuit, the third embodiment of the power-off silent driving circuit of the utility model is proposed.

[0068] In this embodiment, the silent driving module 20 further includes a matching compensation unit 203 , wherein the input end of the matching compensation unit 203 is connected to the output end of the driving control unit 201 , and the output end of the matching compensation unit 203 is connected to the input end of the driving transmission unit 202 .

[0069] It should be noted that the matching compensation unit 203 can be used to compensate for the switch transfer characteristic of the second transistor Q2 so that the second transistor Q2 has the same switch transfer characteristic as the first transistor Q1.

[0070] Further, the matching compensation unit includes a seventh resistor R7, an eighth resistor R8 and a fourth transistor Q4; wherein, the first end of the seventh resistor R7 is simultaneously connected to the collector of the first transistor Q1, the base of the fourth transistor Q4, the collector of the fourth transistor Q4 and the first end of the second resistor R2, the second end of the seventh resistor R7 is connected to the base of the second transistor Q2, the emitter of the fourth transistor Q4 is connected to the first end of the eighth resistor R8, and the second end of the eighth resistor R8 is grounded; the resistance values ​​of the seventh resistor R7 and the eighth resistor R8 are equal.

[0071] Furthermore, the power-off silent driving circuit further includes a voltage dividing module 30 ; the voltage dividing module 30 is arranged between the system power supply VS and the temperature compensation module 10 .

[0072] It should be noted that the voltage divider module 30 can be used to turn off the first transistor Q1 of the silent driving module 20 when the system power supply VS is disconnected.

[0073] It should be understood that by setting the voltage divider module 30, the voltage when the system power supply VS is connected can be greater than the conduction voltage of the first transistor Q1, and the transistor will not be burned due to excessive voltage. When the system power supply VS is disconnected, the amplitude of the voltage divider circuit after dividing the preset detection voltage is exactly equal to the cut-off voltage of the first transistor Q1.

[0074] Further, the voltage divider module includes a ninth resistor R9 and a tenth resistor R10; wherein, the first end of the ninth resistor R9 is connected to the system power supply VS, the second end of the ninth resistor R9 is simultaneously connected to the first end of the tenth resistor R10 and the input end of the temperature compensation module 10, and the second end of the tenth resistor R10 is grounded.

[0075] In this embodiment, the switch transmission characteristics of the second transistor are compensated by setting a matching compensation unit, so that the second transistor has the same switch transmission characteristics as the first transistor, so that the power-off mute driving circuit operates more stably, and the detection circuit is not affected by temperature, reducing the noise condition occurring during the power-off process.

[0076] In addition, an embodiment of the utility model further provides an audio device, wherein the audio device includes the above-mentioned power-off mute driving circuit.

[0077] Since the audio device adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0078] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A power-off silent driving circuit, characterized in that: The power-off mute driving circuit is applied to an audio device, and the power-off mute driving circuit comprises a temperature compensation module and a mute driving module comprising a first transistor; The input end of the temperature compensation module is connected to the system power supply, the output end of the temperature compensation module is connected to the base of the first transistor, and the output end of the mute drive module is connected to the power amplifier of the audio device; The temperature compensation module is used to compensate the on-state voltage of the first transistor so that the amplitude of the on-state voltage of the first transistor is the same at different ambient temperatures; The mute driving module is used to turn off the first transistor after voltage compensation when the system power is disconnected, so as to drive the power amplifier of the audio device to mute.

2. The power-off silent driving circuit according to claim 1, characterized in that: The mute driving module includes a driving control unit including the first triode and a driving transmission unit including the second triode; The base of the first transistor is connected to the output end of the temperature compensation module, the output end of the drive control unit is connected to the input end of the drive transmission unit, and the output end of the drive transmission unit is connected to the power amplifier of the audio device; The drive control unit is used to transmit the switch control signal to the drive transmission unit when the system power is disconnected; The driving transmission unit is used to transmit a low-level mute signal to the power amplifier of the audio device to drive the power amplifier to mute when receiving the switch control signal.

3. The power-off silent driving circuit according to claim 2, characterized in that: The driving control unit further includes a first resistor and a second resistor; The first end of the first resistor is connected to the power supply, the second end of the first resistor is simultaneously connected to the collector of the first transistor, the first end of the second resistor and the input end of the drive transmission unit, the base of the first transistor is connected to the temperature compensation module, and the emitter of the first transistor and the second end of the second resistor are grounded.

4. The power-off silent driving circuit according to claim 3, characterized in that: The temperature compensation module includes a third resistor, a fourth resistor and a third transistor; The first end of the third resistor is connected to the system power supply, the base of the third transistor, and the collector of the third transistor at the same time, the second end of the third resistor is connected to the base of the first transistor, the emitter of the third transistor is connected to the first end of the fourth resistor, and the second end of the fourth resistor is grounded; The resistance values ​​of the third resistor and the fourth resistor are equal.

5. The power-off silent driving circuit according to claim 4, characterized in that: The drive transmission unit further includes a fifth resistor and a sixth resistor; The first end of the fifth resistor is connected to the power supply, the second end of the fifth resistor is simultaneously connected to the collector of the second transistor, the first end of the sixth resistor and the power amplifier of the audio device, the base of the second transistor is connected to the collector of the first transistor, and the emitter of the second transistor and the second end of the sixth resistor are grounded.

6. The power-off silent driving circuit according to claim 5, characterized in that: The silent driving module also includes a matching compensation unit; The input end of the matching compensation unit is connected to the output end of the driving control unit, and the output end of the matching compensation unit is connected to the input end of the driving transmission unit; The matching compensation unit is used to compensate the switch transmission characteristics of the second transistor so that the second transistor has the same switch transmission characteristics as the first transistor.

7. The power-off silent driving circuit according to claim 6, characterized in that: The matching compensation unit includes a seventh resistor, an eighth resistor and a fourth transistor; The first end of the seventh resistor is connected to the collector of the first transistor, the base of the fourth transistor, the collector of the fourth transistor and the first end of the second resistor at the same time, the second end of the seventh resistor is connected to the base of the second transistor, the emitter of the fourth transistor is connected to the first end of the eighth resistor, and the second end of the eighth resistor is grounded; The seventh resistor and the eighth resistor have the same resistance value.

8. The power-off silent driving circuit according to claim 1, characterized in that: The power-off silent driving circuit also includes a voltage division module; The voltage dividing module is arranged between the system power supply and the temperature compensation module; The voltage divider module is used to turn off the first transistor of the mute drive module when the system power is disconnected.

9. The power-off silent driving circuit according to claim 8, characterized in that: The voltage dividing module includes a ninth resistor and a tenth resistor; One end of the ninth resistor is connected to the system power supply, a second end of the ninth resistor is connected to the first end of the tenth resistor and the input end of the temperature compensation module, and a second end of the tenth resistor is grounded.

10. An audio device, characterized in that: The audio device comprises the power-off mute driving circuit according to any one of claims 1 to 9.

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