Loudspeaker control circuit and vehicle

Abstract

The utility model provides a loudspeaker control circuit and a vehicle, the control circuit is used for the vehicle, the control circuit comprises an operation assembly, a plurality of voltage feedback circuits and a main control circuit, and the plurality of voltage feedback circuits are electrically connected with the operation assembly; the main control circuit is electrically connected with the operation assembly and is configured to be connected with the loudspeaker; when the operation assembly receives different external operations, the voltage feedback circuit corresponding to the external operations and the main control circuit are in an electric connection state, the voltage feedback circuit corresponding to the external operations generates a feedback voltage, and the main control circuit controls the loudspeaker to output prompt tones with different volumes based on the feedback voltage. The feedback voltages of the voltage feedback circuits are different. The control circuit of the loudspeaker can improve the driving safety of the vehicle.

Description

Technical Field

[0001] This application relates to the field of electronic technologies, and particularly to a control circuit for a loudspeaker and a vehicle. Background Art

[0002] The loudspeaker is an important component of a vehicle and can play a role in reminding passing vehicles and pedestrians. The existing loudspeakers of vehicles can only output prompt sounds at a fixed volume, that is, whether it is to remind vehicles or pedestrians, the volume of the prompt sounds of the vehicle is the same. However, when using the volume for reminding vehicles to remind pedestrians, it is easy to startle vulnerable groups that are sensitive to sounds, such as the elderly and children. The startled groups may make actions that are not conducive to driving safety, reducing driving safety. Utility Model Content

[0003] This application provides a control circuit for a loudspeaker and a vehicle, which can improve the driving safety of the vehicle.

[0004] To solve the above technical problems, a technical solution adopted in this application is: to provide a control circuit for a loudspeaker, which is used for a vehicle. The control circuit includes an operation component, a plurality of voltage feedback circuits, and a main control circuit. The plurality of voltage feedback circuits are electrically connected to the operation component; the main control circuit is electrically connected to the operation component and is configured to be connected to the loudspeaker. Among them, when the operation component receives different external operations, the voltage feedback circuit and the main control circuit corresponding to the external operation are in an electrically connected state. The voltage feedback circuit corresponding to the external operation generates a feedback voltage, and the main control circuit controls the loudspeaker to output prompt sounds at different volumes based on the feedback voltage; the feedback voltages of each voltage feedback circuit are different.

[0005] In one embodiment, the operation component at least includes a first operation part and a second operation part, and the first operation part and the second operation part are connected to the corresponding voltage feedback circuit, where the first operation part and the second operation part are used to receive different external operations.

[0006] In one embodiment, the operation component includes a normally open and resetable switch.

[0007] In one embodiment, the first operation part and the second operation part of the switch are connected in parallel and are connected in series with the corresponding voltage feedback circuit.

[0008] In one embodiment, the switch includes a push switch.

[0009] In one embodiment, the voltage feedback circuit includes a voltage dividing resistor. One end of the voltage dividing resistor is electrically connected to the operation component, and the other end of the voltage dividing resistor is grounded. Among them, the resistance values of the voltage dividing resistors corresponding to different voltage feedback circuits are different.

[0010] In one embodiment, the main control circuit includes a controller and a signal processing circuit, the controller is electrically connected to the operating component; the signal generating circuit is connected to the controller; the control circuit also includes a driving circuit, the driving circuit is connected to the signal generating circuit and is connected to a speaker; wherein the controller generates pulse width modulation signals with different duty cycles based on different feedback voltages, and the signal generating circuit drives the driving circuit to operate based on the pulse width modulation signal.

[0011] In one embodiment, the control circuit further includes an anti-reverse circuit, which is connected to the signal generating circuit and the driving circuit and receives the first power supply signal.

[0012] In one embodiment, the anti-reverse circuit includes a first diode, a first switch tube, a second switch tube and a first resistor, the anode of the first diode is connected to the first power supply signal, the cathode of the first diode is connected to the power supply end of the signal generating circuit and the power supply end of the driving circuit; the first communication end of the first switch tube is connected to the anode of the first diode, the second communication end of the first switch tube is connected to the cathode of the first diode, and the control end of the first switch tube is connected to the control end of the signal generating circuit; the first communication end of the second switch tube is connected to the first communication end of the first switch tube and the anode of the first diode, and the control end of the second switch tube is grounded; one end of the first resistor is connected to the first communication end of the first switch tube and the anode of the first diode, and the other end of the first resistor is connected to the second communication end of the second switch tube and the control end of the first switch tube.

[0013] In order to solve the above technical problem, another technical solution adopted in the present application is: providing a vehicle, the vehicle includes a speaker and the above control circuit, and the speaker is connected to the control circuit.

[0014] The beneficial effects of the present application are as follows: the control circuit of the present application includes an operating component, a plurality of voltage feedback circuits and a main control circuit, wherein the plurality of voltage feedback circuits are electrically connected to the operating component; the main control circuit is electrically connected to the operating component and configured to be connected to a speaker; wherein, when the operating component receives different external operations, the voltage feedback circuit corresponding to the external operation and the main control circuit are in an electrically connected state, the voltage feedback circuit corresponding to the external operation generates a feedback voltage, and the main control circuit controls the speaker to output prompt sounds of different volumes based on the feedback voltage; the feedback voltage of each voltage feedback circuit is different. That is, when the operating component receives different external operations, the voltage feedback circuit corresponding to the external operation is electrically connected to the main control circuit through the operating component, and the voltage feedback circuit outputs a feedback voltage to the main control circuit, and the main control circuit controls the speaker to output prompt sounds of different volumes based on the received feedback voltage, so that the vehicle uses prompt sounds of different volumes to prompt pedestrians or vehicles, avoids disturbing sound-sensitive groups, reduces the actions of the frightened groups that are not conducive to driving safety, and can improve the driving safety of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings, where:

[0016] Figure 1 is a schematic structural diagram of an embodiment of the control circuit of the loudspeaker provided by the present application;

[0017] Figure 2 is a schematic circuit diagram of an embodiment of the control circuit of the loudspeaker provided by the present application;

[0018] Figure 3 is a schematic circuit diagram of an embodiment of the anti-reverse circuit provided by the present application;

[0019] Figure 4 is a schematic structural diagram of an embodiment of the vehicle provided by the present application. Detailed implementation manners

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0021] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present application, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0022] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0023] The present application provides a control circuit of a speaker, and the control circuit of the speaker is applied to a vehicle, wherein the vehicle may be a car, an electric vehicle, a motorcycle, a bicycle, etc., which is not limited here. Figures 1 to 2 , Figure 1 is a structural diagram of an embodiment of a control circuit of a speaker provided by the present application, Figure 2 1 is a circuit diagram of an embodiment of a control circuit of a speaker provided in the present application, wherein the control circuit 10 includes an operating component 110, a plurality of voltage feedback circuits 120 and a main control circuit 130. The plurality of voltage feedback circuits 120 are connected to the operating component 110, and the operating component 110 is also connected to the main control circuit 130, and the main control circuit 130 is configured to be connected to the speaker 20. When the operating component 110 receives different external operations, the voltage feedback circuit 120 corresponding to the external operation and the main control circuit 130 are in an electrically connected state, the voltage feedback circuit 120 corresponding to the external operation generates a feedback voltage, and the main control circuit 130 controls the speaker 20 to output prompt sounds of different volumes based on the feedback voltage; the feedback voltage of each voltage feedback circuit 120 is different.

[0024] It can be understood that the operating component 110 is capable of receiving different external operations, and when receiving different external operations, the voltage feedback circuit 120 corresponding to the external operation is electrically connected to the main control circuit 130 through the operating component 110, and at the same time, the voltage feedback circuit 120 outputs a feedback voltage to the main control circuit 130. The main control circuit 130 controls the speaker 20 to output prompt sounds of different volumes based on the received feedback voltage, so that the vehicle uses prompt sounds of different volumes to prompt pedestrians or vehicles, avoids disturbing sound-sensitive groups, reduces the frightened groups from taking actions that are not conducive to driving safety, and can improve the driving safety of the vehicle.

[0025] For example, the operating component 110 may receive a first external operation and a second external operation, the first external operation may correspond to a loud volume prompt tone, and the second external operation may correspond to a soft volume prompt tone, which is not limited here. When the operating component 110 receives the first external operation, the voltage feedback circuit 120 corresponding to the first external operation is electrically connected to the main control circuit 130, and the voltage feedback circuit 120 outputs a first feedback voltage to the main control circuit 130, and the main control circuit 130 controls the speaker 20 to output a loud volume prompt tone based on the received first feedback voltage; when the operating component 110 receives the second external operation, the voltage feedback circuit 120 corresponding to the second external operation is electrically connected to the main control circuit 130, and the voltage feedback circuit 120 outputs a second feedback voltage to the main control circuit 130, and the main control circuit 130 controls the speaker 20 to output a soft volume prompt tone based on the received second feedback voltage.

[0026] In one embodiment, the operation component 110 includes at least a first operation part 112 and a second operation part 113. The first operation part 112 and the second operation part 113 are connected to the corresponding voltage feedback circuit 120. Among them, the first operation part 112 and the second operation part 113 are used to receive different external operations. The operation component 110 further includes an electrical connection part 111. Among them, the electrical connection part 111 is connected to the main control circuit 130. When the first operation part 112 or the second operation part 113 is connected to the electrical connection part 111, the voltage feedback circuit 120 corresponding to the first operation part 112 or the second operation part 113 is electrically connected to the main control circuit 130. By setting the first operation part 112 and the second operation part 113 in the operation component 110 of this embodiment to receive different external operations, the control of different volumes of the speaker 20 can be realized. At the same time, its structure is simple and easy to implement.

[0027] For example, the first operation part 112 is used to receive the demand for a high-volume reminder tone, and the second operation part 113 is used to receive the demand for a low-volume reminder tone.

[0028] In one embodiment, the operation component 110 includes a normally open and resetable switch (not labeled in the figure). It can be understood that normally open and resetable means that when the switch does not receive an external operation, the branches where the first operation part 112 and the second operation part 113 of the switch are located are in an open state with the main control circuit 130 and the voltage feedback circuit 120; when the switch receives an external operation, the first operation part 112 or the second operation part 113 is in a connected state with the branches where its corresponding voltage feedback circuit 120 and the main control circuit 130 are located, and the switch can automatically reset when the external operation is cancelled, so that the branches where the first operation part 112 and the second operation part 113 are located with the main control circuit 130 and the voltage feedback circuit 120 return to the open state.

[0029] For example, the switch can be a switch with different ranges, or a touch-type switch, or a knob gear switch, etc., which is not limited here.

[0030] In one embodiment, different operation parts of the switch are connected in parallel, so that the switch is arranged in parallel with multiple voltage feedback circuits 120, and the switch is connected in series with the main control circuit 130 after being connected in parallel with the voltage feedback circuit 120. For example, the first operation part 112 of the switch is connected to a voltage feedback circuit 120, the second operation part 113 of the switch is connected to another voltage feedback circuit 120, and the electrical connection part 111 of the switch is connected to the main control circuit 130. Among them, the first operation part 112 and the second operation part 113 are arranged in parallel, so that when the first operation part 112 or the second operation part 113 is connected to the electrical connection part 111, the corresponding feedback voltage is fed back to the main control circuit 130.

[0031] In one embodiment, to facilitate the user to control the volume of the speaker 20, the switch includes a push switch (not labeled in the figure). The push switch has different gears. By pressing different gears, the user can control the speaker 20 to output prompt tones of different volumes. In this embodiment, by setting the push switch, which is an improvement on the original vehicle push switch, the user does not need to re - adapt to the control method of the prompt tone, facilitating user operation.

[0032] In one embodiment, the voltage feedback circuit 120 includes voltage - dividing resistors (refer to resistor R21 or resistor R22). One end of the voltage - dividing resistor is electrically connected to the operation component 110, and the other end of the voltage - dividing resistor is grounded to GND. Among them, the resistance values of the voltage - dividing resistors corresponding to different voltage feedback circuits 120 are different, so that when the operation component 110 receives different external operations, the voltage - dividing resistor can feedback different feedback voltages to the main control circuit 130. The voltage feedback circuit 120 of this embodiment only includes voltage - dividing resistors with different resistance values, has a simple structure, is easy to implement, has few components, and low cost.

[0033] For example, a voltage feedback circuit 120 includes a voltage - dividing resistor R21. One end of the voltage - dividing resistor R21 is electrically connected to the second operation part, and the other end of the voltage - dividing resistor R21 is grounded to GND. Among them, the voltage - dividing resistor R21 is 10K; another voltage feedback circuit 120 includes a voltage - dividing resistor R22. One end of the voltage - dividing resistor R22 is electrically connected to the first operation part, and the other end of the voltage - dividing resistor R22 is grounded to GND. Among them, the voltage - dividing resistor R22 is 5K. The specific value of the voltage - dividing resistor is not limited here.

[0034] In one embodiment, the control circuit 10 further includes a driving circuit 140. The main control circuit 130 further includes a controller 131 and a signal generating circuit 132. Among them, the signal processing circuit is respectively connected to the controller 131 and the driving circuit 140. The driving circuit 140 is used to connect to the speaker 20. The controller 131 is also electrically connected to the operation component 110. Among them, the controller 131 generates pulse - width modulation signals with different duty cycles based on different feedback voltages, and the signal generating circuit 132 drives the driving circuit 140 to work based on the pulse - width modulation signals, so that the driving circuit 140 outputs different powers, thereby driving the speaker 20 to output prompt tones of different volumes.

[0035] For example, when the controller 131 receives a feedback voltage corresponding to a high-volume beeping sound, the controller 131 generates a pulse-width modulation signal with a large duty cycle, causing the drive circuit 140 to output at full power; when the controller 131 receives a feedback voltage corresponding to a low-volume beeping sound, the controller 131 generates a pulse-width modulation signal with a small duty cycle and the same frequency, causing the drive circuit 140 to output at a load power less than full power. In other embodiments, the controller 131 can also directly output other types of control signals, such as high level, low level, etc., not limited to pulse-width modulation signals.

[0036] It can be known that the control circuit 10 further includes a peripheral circuit (not labeled in the figure) for maintaining the normal operation of the controller 131, such as a crystal oscillator circuit, a reset circuit, etc.

[0037] In one embodiment, the signal generation circuit 132 includes a pre-driver chip (not labeled in the figure) and a peripheral circuit (not labeled in the figure) for maintaining the normal operation of the pre-driver chip. The pre-driver chip integrates the logic part of the drive and can drive multiple triodes to work based on the pulse-width modulation signal.

[0038] In one embodiment, the drive circuit 140 includes an H-bridge drive circuit (not labeled in the figure), where the H-bridge drive circuit is composed of multiple triodes.

[0039] In one embodiment, the controller 131 is a general-purpose controller 131. The controller 131 may be an integrated circuit chip with signal processing capabilities. The controller 131 can also be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field-programmable gate array (FPGA), or other programmable logic devices. The controller 131 can also be a microprocessor or the controller can also be any conventional processor, etc.

[0040] In one embodiment, the analog-to-digital conversion interface of the controller 131 is electrically connected to the operation component 110. The controller 131 converts the feedback voltage of the analog signal into a digital signal through the analog-to-digital conversion interface, enabling the controller 131 to generate pulse-width modulation signals with different duty cycles based on different feedback voltages. In other embodiments, the control circuit 10 further includes an analog-to-digital conversion circuit (not labeled in the figure). The analog-to-digital conversion circuit is respectively connected to the controller 131 and the operation component 110. The analog-to-digital conversion circuit is used to convert the feedback voltage from an analog signal into a digital signal, and the controller 131 generates pulse-width modulation signals with different duty cycles based on the feedback voltage of the digital signal.

[0041] In one embodiment, the control circuit 10 further includes a diode D51, a resistor R51, a resistor R52, a capacitor C51, a resistor R53, and a capacitor C52. The anode of the diode D51 is connected to the second power supply signal VCC2. The cathode of the diode D51 is connected to one end of the resistor R51. The other end of the resistor R51 is connected to the operation component 110, one end of the resistor R52, and one end of the capacitor C51. The other end of the capacitor C51 is grounded to GND. The other end of the resistor R52 is connected to the controller 131, one end of the resistor R53, and one end of the capacitor C52. The other end of the resistor R53 and the other end of the capacitor C52 are grounded to GND. Among them, the diode D51 is used to protect the power supply of the second power supply signal VCC2. The resistor R51 is used to form a voltage dividing circuit with the voltage dividing resistor. The resistor R52 is used to protect the input port of the controller. The resistor R53 and the capacitor C52 are used to form a filtering circuit to reduce the interference signal of the circuit.

[0042] In one embodiment, the control circuit 10 further includes a clamping device D52. The first end of the clamping device D52 is connected to the second power supply signal VCC2. The second end of the clamping device D52 is grounded to GND. The third end of the clamping device D52 is connected to the other end of the resistor R52, the controller 131, one end of the resistor R53, and one end of the capacitor C52. The clamping device D52 is used to clamp and protect the controller 131, which can improve the stability of the control circuit 10.

[0043] In one embodiment, the control circuit 10 further includes an anti-reverse circuit (not marked in the figure). The anti-reverse circuit is connected to the signal generation circuit 132 and the drive circuit 140, and is connected to the first power supply signal VCC1 (refer to Figure 3 ). The anti-reverse circuit is used to cut off when the first power supply signal VCC1 is reversely connected, so as to disconnect the first power supply signal VCC1 from entering the signal generation circuit 132, the drive circuit 140, the speaker 20, etc. By setting the anti-reverse circuit in the control circuit 10 of this embodiment, it is possible to avoid the reverse first power supply signal VCC1 from damaging the signal generation circuit 132, the drive circuit 140, the speaker 20, etc., and improve the use safety and stability of the control circuit 10.

[0044] In one embodiment, refer to Figure 3 , Figure 3It is a schematic circuit diagram of an anti-reverse circuit provided by this application. The anti-reverse circuit includes a first diode D61, a first switching transistor Q61, a second switch Q62, and a first resistor R61. The anode of the first diode D61 is connected to a first power supply signal VCC1, and the cathode of the first diode D61 is connected to the power supply terminal of the signal generation circuit 132 and the power supply terminal of the drive circuit 140; the first communication terminal of the first switching transistor Q61 is connected to the anode of the first diode D61, the second communication terminal of the first switching transistor Q61 is connected to the cathode of the first diode D61, and the control terminal of the first switching transistor Q61 is connected to the control terminal of the signal generation circuit 132; the first communication terminal of the second switching transistor Q62 is connected to the first communication terminal of the first switching transistor Q61 and the anode of the first diode D61, and the control terminal of the second switching transistor Q62 is grounded to GND; one end of the first resistor R61 is connected to the first communication terminal of the first switching transistor Q61 and the anode of the first diode D61, and the other end of the first resistor R61 is connected to the second communication terminal of the second switching transistor Q62 and the control terminal of the first switching transistor Q61.

[0045] It can be known that when the first power supply signal VCC1 is normally connected to the anti-reverse circuit, the first power supply signal VCC1 supplies power to the signal generation circuit 132 through the first diode D61. The signal generation circuit 132 provides a control voltage to the control terminal of the first switching transistor Q61 based on the first power supply signal VCC1, so that the first switching transistor Q61 is turned on. Thus, the first power supply signal VCC1 supplies power to the signal generation circuit 132, the drive circuit 140, the speaker 20, etc. through the first switching transistor Q61; when the first power supply signal VCC1 is reversely connected to the anti-reverse circuit, at this time the second switching transistor Q62 is turned on, clamping the voltage between the control terminal and the second communication terminal of the first switching transistor Q61 at about 0.7V, ensuring that the first switching transistor Q61 cannot be turned on, thereby protecting the signal generation circuit 132, the drive circuit 140, the speaker 20, etc., and being able to avoid the reverse first power supply signal VCC1 from damaging the signal generation circuit 132, the drive circuit 140, the speaker 20, etc., improving the use safety and stability of the control circuit 10. In addition, the anti-reverse circuit of this embodiment has a simple structure and is easy to implement.

[0046] In order to improve the stability of the anti-reverse circuit, the anti-reverse circuit further includes a diode D62, a diode D63, a capacitor C61, a resistor R63, and a resistor R64. Among them, the diode D62 and the capacitor C61 are connected in parallel and then connected in series between the control terminal and the first communication terminal of the first switching transistor Q61, and the cathode of the diode D62 is connected to the control terminal of the first switching transistor Q61; the anode of the diode D63 is connected to the first communication terminal of the second switching transistor Q62 and one end of the resistor R63, and the cathode of the diode D63 is connected to the first power supply signal VCC1; the other end of the resistor R63 is connected to the control terminal of the second switching transistor Q62 and one end of the resistor R64, and the other end of the resistor R64 is grounded to GND.

[0047] In one embodiment, the control circuit 10 further includes a current detection circuit (not labeled in the figure). The current detection circuit is respectively connected to the controller 131 and the driving circuit 140. The current detection circuit is configured to detect the current signal output by the driving circuit 140 and feedback the current signal to the controller 131. The controller 131 can control the driving circuit 140 to stop working when the current signal is greater than a threshold value, so as to avoid damage to the speaker 20.

[0048] This application provides a vehicle. Refer to Figure 4 , Figure 4 FIG. is a schematic structural diagram of an embodiment of the vehicle provided by this application. The vehicle 30 includes a speaker 20 and a control circuit 10. The control circuit 10 is connected to the speaker 20. The user can control the speaker 20 to output prompt sounds of different volumes through the operation component 110 of the control circuit 10, so that the vehicle 30 can prompt the vehicle or pedestrians through prompt sounds of different volumes, thereby improving the safety of vehicle driving. Among them, the control circuit 10 is any one of the control circuit embodiments of the above-mentioned speaker, and is not limited herein.

[0049] The above are only the embodiments of this application, and do not limit the patent scope of this application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of this application, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of this application.

Claims

1. A control circuit for a loudspeaker, characterized in that, For a vehicle, the control circuit includes: An operation component; A plurality of voltage feedback circuits electrically connected to the operation component; A main control circuit electrically connected to the operation component and configured to access the speaker; Wherein, when the operation component receives different external operations, the voltage feedback circuit and the main control circuit corresponding to the external operation are in an electrically connected state, the voltage feedback circuit corresponding to the external operation generates a feedback voltage, and the main control circuit controls the speaker to output prompt sounds of different volumes based on the feedback voltage; the feedback voltages of each voltage feedback circuit are different.

2. The control circuit according to claim 1, wherein The operation component at least includes a first operation part and a second operation part, and the first operation part and the second operation part are connected to the corresponding voltage feedback circuit, wherein the first operation part and the second operation part are used to receive different external operations.

3. The control circuit according to claim 2, wherein The operation component includes a normally open and resettable switch.

4. The control circuit according to claim 3, wherein The first operation part and the second operation part of the switch are in parallel and are connected in series with the corresponding voltage feedback circuit.

5. The control circuit according to claim 3, characterized in that, The switch includes a push switch.

6. The control circuit according to claim 1, wherein The voltage feedback circuit includes a voltage dividing resistor, one end of the voltage dividing resistor is electrically connected to the operation component, and the other end of the voltage dividing resistor is grounded, wherein the resistance values of the voltage dividing resistors corresponding to different voltage feedback circuits are different.

7. The control circuit according to claim 1, wherein The main control circuit includes: A controller electrically connected to the operation component; A signal generation circuit connected to the controller; The control circuit further includes: A drive circuit connected to the signal generation circuit and accessing the speaker; Wherein, the controller generates a pulse width modulation signal with different duty cycles based on different feedback voltages, and the signal generation circuit drives the drive circuit to work based on the pulse width modulation signal.

8. The control circuit according to claim 7, wherein The control circuit further includes: An anti-reverse circuit connected to the signal generation circuit and the drive circuit and accessing a first power supply signal.

9. The control circuit according to claim 8, characterized in that The anti-reverse circuit includes: A first diode, the anode of the first diode accesses the first power supply signal, and the cathode of the first diode is connected to the power supply terminal of the signal generation circuit and the power supply terminal of the drive circuit; A first switch tube, the first communication terminal of the first switch tube is connected to the anode of the first diode, the second communication terminal of the first switch tube is connected to the cathode of the first diode, and the control terminal of the first switch tube is connected to the control terminal of the signal generation circuit; A second switch tube, the first communication terminal of the second switch tube is connected to the first communication terminal of the first switch tube and the anode of the first diode, and the control terminal of the second switch tube is grounded; A first resistor, one end of the first resistor is connected to the first communication terminal of the first switch tube and the anode of the first diode, and the other end of the first resistor is connected to the second communication terminal of the second switch tube and the control terminal of the first switch tube.

10. A vehicle, characterized in that, Includes: A speaker and the control circuit according to any one of claims 1-9, the speaker is connected to the control circuit.

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