Prompt tone device on vehicle and electric vehicle

Abstract

The utility model provides a warning tone device on a vehicle and an electric vehicle, and relates to the technical field of vehicle control. The device comprises a domain controller and a playing device, the microcontroller and the digital-to-analog conversion unit are integrated on the domain controller, so that the number of controllers on the vehicle is reduced, the integration level of the domain controller is improved, and the problem that the cost of the whole vehicle is high due to the fact that an additional warning tone controller needs to be added in the prior art is solved; the connection through a specific cable is not needed; the microcontroller generates a digital signal when detecting that a low-speed analog sound triggering condition on a vehicle is triggered, and transmits the digital signal to the digital-to-analog conversion unit, and the digital-to-analog conversion unit performs digital-to-analog conversion on the digital signal to obtain an analog signal; the analog signal is sent to the playing device, and the playing device outputs corresponding sound under the action of the analog signal, so that the purpose of reminding pedestrians is achieved, and the safety of vehicle driving is improved.

Description

Technical Field

[0001] The present application relates to the field of vehicle control technology, and in particular to a vehicle prompt sound device and an electric vehicle. Background Art

[0002] Because electric vehicles lack fuel engines, they are essentially silent during the start-up phase or when traveling at low speeds. This can easily lead to pedestrians not noticing the approaching vehicle and causing a collision. Therefore, new energy vehicles require a separate low-speed warning sound device to generate a warning sound during the start-up phase or when traveling at low speeds to alert pedestrians.

[0003] At present, the low-speed warning sound devices on new energy vehicles mainly include two forms. One is a split type, that is, the warning sound controller and the speaker are separated, and the two need to be connected by a specific cable; the other is an integrated type, that is, the warning sound controller and the speaker are the same component.

[0004] However, both of the above forms require communication with the domain controller through a controller area network (CAN) and require an additional prompt sound controller, resulting in higher vehicle costs. Utility Model Content

[0005] The purpose of this application is to provide a vehicle warning sound device and an electric vehicle in order to solve the technical problems existing in the prior art in view of the above-mentioned deficiencies in the prior art.

[0006] To achieve the above objectives, the technical solutions adopted in the embodiments of the present application are as follows:

[0007] In a first aspect, an embodiment of the present application provides a vehicle-mounted prompt sound device, comprising: a domain controller and a playback device; the domain controller and the playback device are connected via a communication cable;

[0008] Wherein, the domain controller includes: a microcontroller and a digital-to-analog conversion unit;

[0009] The microcontroller includes a plurality of output ports;

[0010] At least one output port of the microcontroller is connected to an input port of the digital-to-analog conversion unit, each output port of the digital-to-analog conversion unit is connected to an input port of the power amplifier, and the output port of the power amplifier is connected to an input end of the playback device via a communication cable;

[0011] The microcontroller is used to generate a digital signal and transmit the digital signal to the digital-to-analog conversion unit;

[0012] The digital-to-analog conversion unit is configured to receive the digital signal, perform digital-to-analog conversion on the digital signal to obtain an analog signal, and output the analog signal to the power amplifier;

[0013] The power amplifier is used to receive the analog signal, amplify the analog signal to obtain an amplified signal, and transmit the amplified signal to the playback device via the communication cable.

[0014] Optionally, the number of output ports of the microcontroller is N, and N is 12 or 16;

[0015] The digital-to-analog conversion unit includes: a digital-to-analog conversion resistor array, the digital-to-analog conversion resistor array includes: N-1 first resistor branches and 1 second resistor branch, each of the first resistor branches includes a voltage divider resistor and a summing resistor, and the resistance of the voltage divider resistor is twice the resistance of the summing resistor;

[0016] The second resistor branch includes a first voltage-dividing resistor and a second voltage-dividing resistor.

[0017] Optionally, in each first resistance branch, one end of the voltage divider resistor is respectively connected to an output port of the microcontroller, the other end of the voltage divider resistor is connected to one end of a summing resistor, and the other end of the summing resistor is connected to one end of the summing resistor of the next first resistance branch or one end of the second voltage divider resistor of the second resistance branch;

[0018] One end of the first voltage-dividing resistor is connected to an output port of the microcontroller, the other end of the first voltage-dividing resistor is connected to one end of the second voltage-dividing resistor, and the other end of the second voltage-dividing resistor is grounded.

[0019] Optionally, the digital-to-analog conversion unit further includes: a first resistor, a filtering unit, and an isolation unit;

[0020] One end of the summing resistor of the first first resistor branch is connected to one end of the first resistor;

[0021] The other end of the first resistor is connected to one end of the filter unit and one end of the isolation unit respectively;

[0022] The other end of the filtering unit is connected to the first input port of the power amplifier, and the filtering unit is used to filter the analog signal output by the digital-to-analog conversion resistor array to obtain a filtered signal, and transmit the filtered signal to the power amplifier;

[0023] The other end of the isolation unit is connected to the second input port of the power amplifier. The isolation unit is used to isolate the DC signal contained in the analog signal output by the digital-to-analog conversion resistor array to obtain an isolated signal, and transmit the isolated signal to the power amplifier.

[0024] Optionally, the filtering unit includes: a second resistor and a first capacitor;

[0025] One end of the second resistor is connected to the other end of the first resistor and one end of the isolation unit respectively;

[0026] The other end of the second resistor is connected to one end of the first capacitor;

[0027] The other end of the first capacitor is connected to the first input end of the power amplifier.

[0028] Optionally, the isolation unit includes: a second capacitor and a third capacitor;

[0029] One end of the second capacitor is connected to the other end of the first resistor and one end of the second resistor respectively;

[0030] The other end of the third capacitor is connected to the ground end and one end of the third capacitor respectively;

[0031] The other end of the third capacitor is connected to the second input end of the power amplifier.

[0032] Optionally, the domain controller further comprises: a storage unit; the number of output ports of the microcontroller is N+1;

[0033] The storage unit is connected to the N+1th output port and one input port of the microcontroller;

[0034] The storage unit is used to store a plurality of pre-generated audio source files;

[0035] The microcontroller is used to read a target audio source file from a plurality of audio source files stored in the storage space.

[0036] Optionally, the playback device includes: a speaker.

[0037] Optionally, the number of the speakers is greater than or equal to 1.

[0038] In a second aspect, an embodiment of the present application further provides an electric vehicle, on which the vehicle prompt sound device provided in the embodiment of the first aspect mentioned above is integrated.

[0039] The beneficial effects of this application are:

[0040] The present application provides a vehicle-mounted warning sound device and an electric vehicle. In this solution, the device includes: a domain controller and a playback device; the domain controller and the playback device are connected via a communication cable; and a microcontroller and a digital-to-analog conversion unit are integrated on the domain controller at the same time, which reduces the number of controllers provided on the vehicle, improves the integration of the domain controller, and solves the problem in the prior art of requiring the addition of an additional warning sound controller resulting in higher vehicle costs. The microcontroller and the digital-to-analog conversion unit are connected port to port, i.e., no specific cable is required for connection, which simplifies the assembly process. When the microcontroller detects that a low-speed analog sound trigger condition on the vehicle is triggered, the microcontroller generates a digital signal and transmits the digital signal to the digital-to-analog conversion unit through a port on the microcontroller connected to the digital-to-analog conversion unit, and the digital-to-analog conversion unit performs digital-to-analog conversion on the digital signal to obtain an analog signal. Finally, the digital-to-analog conversion unit sends the analog signal to the playback device via the communication cable, and the playback device outputs a corresponding sound under the action of the analog signal, thereby achieving the purpose of reminding pedestrians and improving the safety of vehicle driving. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0042] Figure 1 Schematic diagram of the structure of the prompt sound device provided in the embodiment of the present application Figure 1 ;

[0043] Figure 2 A schematic diagram of the structure of a digital-to-analog conversion unit in the prompt sound device provided in an embodiment of the present application;

[0044] Figure 3 Schematic diagram of the structure of the prompt sound device provided in the embodiment of the present application Figure 2 ;

[0045] Figure 4 A schematic structural diagram of an electric vehicle provided in an embodiment of the present application.

[0046] Icons: 100 - prompt sound device; 101 - domain controller; 102 - playback device; 103 - microcontroller; 104 - digital-to-analog conversion unit; 105 - power amplifier; 401 - storage unit; 500 - electric vehicle. DETAILED DESCRIPTION

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0048] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0049] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0050] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0051] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0052] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0053] The structure of the vehicle warning sound device 100 provided by the present application is briefly described below through multiple embodiments.

[0054] Figure 1 The structure of the vehicle warning sound device 100 provided in the embodiment of the present application is shown as follows: Figure 1 ;like Figure 1 As shown, the prompt sound device 100 includes: a domain controller 101 and a playback device 102; illustratively, for example, the domain controller 101 can be an electronic device with data processing function on the vehicle; the playback device 102 can be a device on the vehicle with audio data playback function, such as an external speaker.

[0055] The domain controller 101 and the playback device 102 are connected via a communication cable. For example, the communication cable can be a High Definition Multimedia Interface (HDMI) cable, that is, audio data is output between the domain controller 101 and the playback device 102 via the HDMI cable.

[0056] Continue to refer Figure 1 As shown, the domain controller 101 includes: a microcontroller 103, a digital-to-analog conversion unit 104 and a power amplifier 105; that is, in this solution, in order to improve the integration of the domain controller 101 and reduce the layout restrictions brought by the distributed controller, the present application proposes that the microcontroller 103, the digital-to-analog conversion unit 104 and the power amplifier 105 can be integrated on the domain controller 101, thereby reducing the number of controllers provided on the vehicle and achieving the purpose of reducing the cost of the entire vehicle.

[0057] Specifically, the microcontroller 103 includes a plurality of output ports, that is, the microcontroller 103 is provided with a plurality of input and output pins, that is, I / O ports.

[0058] Among them, at least one output port of the microcontroller 103 is connected to the input port of the digital-to-analog conversion unit 104, each output port of the digital-to-analog conversion unit 104 is connected to the input port of the power amplifier 105, and the output port of the power amplifier 105 is connected to the input end of the playback device 102 via a communication cable; therefore, in the prompt sound device provided by this solution, the microcontroller, the digital-to-analog conversion unit and the power amplifier are connected to each other via ports, that is, there is no need to connect through specific cables, which simplifies the assembly process.

[0059] The microcontroller 103 is used to generate a digital signal and transmit the digital signal to the digital-to-analog conversion unit 104; illustratively, for example, after the microcontroller 103 is powered on, it cyclically detects whether the low-speed analog sound trigger condition on the vehicle is triggered, wherein the low-speed analog sound trigger condition includes: the vehicle is in the starting stage or the vehicle is in a low-speed driving state; if triggered, the audio file pre-stored on the microcontroller 103 is obtained, and the audio file is processed in volume, frequency shift and sound effects to generate a digital signal, and the digital signal is transmitted to the digital-to-analog conversion unit 104 through the output port connected to the digital-to-analog conversion unit 104.

[0060] The digital-to-analog conversion unit 104 is configured to perform digital-to-analog conversion on the digital signal to obtain an analog signal, and output the analog signal to the power amplifier 105 .

[0061] For example, the digital-to-analog conversion unit 104 may be an 8-bit digital-to-analog conversion chip DAC0832.

[0062] Optionally, in this solution, the received digital signal is converted from digital to analog by the digital-to-analog conversion unit 104 to obtain an analog signal, and the analog signal is transmitted to the power amplifier 105 via a communication cable.

[0063] The power amplifier 105 is configured to receive the analog signal output by the digital-to-analog conversion unit 104 , amplify the analog signal to obtain an amplified signal, and transmit the amplified signal to the playback device 102 via a communication cable.

[0064] Optionally, in this embodiment, in order to improve the sound effect output by the playback device 102, it is proposed that a power amplifier 105 can also be integrated on the domain controller 101, and the analog signal output by the digital-to-analog conversion unit 104 is amplified by the power amplifier 105 to obtain an amplified signal, and then the amplified signal is transmitted to the playback device 102. Under the action of the amplified signal, the playback device 102 outputs corresponding amplified audio data, such as voice prompt information or beeping prompt sound, so as to achieve the effect of increasing the volume and tone of the pedestrian prompt sound, thereby making the pedestrian prompt sound serve as a warning.

[0065] In summary, an embodiment of the present application provides a vehicle-mounted warning sound device. In this solution, the device includes: a domain controller and a playback device; the domain controller and the playback device are connected via a communication cable; and the domain controller is integrated with a microcontroller, a digital-to-analog conversion unit, and a power amplifier. This reduces the number of controllers provided on the vehicle, improves the integration of the domain controller, and solves the problem of the prior art that an additional warning sound controller is required, resulting in a high cost of the entire vehicle. In addition, the microcontroller, the digital-to-analog conversion unit, and the power amplifier are connected port to port, i.e., no specific cable is required for connection, which simplifies the assembly process. When the microcontroller detects that a low-speed analog sound trigger condition on the vehicle is triggered, the microcontroller generates a digital signal and transmits the digital signal to the digital-to-analog conversion unit via a port on the microcontroller connected to the digital-to-analog conversion unit. The digital-to-analog conversion unit performs digital-to-analog conversion on the digital signal to obtain an analog signal, which is output to the power amplifier. The power amplifier amplifies the analog signal to obtain an amplified signal. Finally, the power amplifier transmits the amplified signal to the playback device via the communication cable. Under the action of the amplified signal, the playback device outputs a corresponding sound, thereby alerting pedestrians and improving vehicle driving safety.

[0066] Optionally, the number of output ports of the microcontroller 103 is N, and N is 12 or 16.

[0067] The digital-to-analog conversion unit 104 includes a digital-to-analog conversion resistor array.

[0068] The digital-to-analog conversion resistor array includes N-1 first resistor branches and one second resistor branch. Each first resistor branch includes a voltage divider resistor and a summing resistor. The voltage divider resistor has a resistance twice that of the summing resistor. For example, the voltage divider resistor has a resistance of 20 kΩ and the summing resistor has a resistance of 10 kΩ.

[0069] The second resistor branch includes a first voltage-dividing resistor and a second voltage-dividing resistor.

[0070] Optionally, refer to Figure 2 As shown, the number of output ports of the microcontroller 103 is 16 as an example, that is, the digital-to-analog conversion resistor array includes: 15 first resistor branches and 1 second resistor branch, wherein the first resistor branch includes: a 20KΩ voltage divider resistor and a 10KΩ summing resistor, and the second voltage divider resistor includes: two 20KΩ voltage divider resistors.

[0071] In each first resistance branch, one end of the voltage divider resistor is respectively connected to an output port of the microcontroller 103, the other end of the voltage divider resistor is connected to one end of the summing resistor, and the other end of the summing resistor is connected to one end of the summing resistor of the next first resistance branch or one end of the second voltage divider resistor of the second resistance branch;

[0072] In the second resistor branch, one end of the first voltage divider resistor is connected to an output port of the microcontroller 103 , the other end of the first voltage divider resistor is connected to one end of the second voltage divider resistor, and the other end of the second voltage divider resistor is grounded.

[0073] Continue to refer Figure 2 As shown, the digital-to-analog conversion resistor array is composed of 15 10KΩ summing resistors (accuracy ±1%) and 17 20KΩ voltage divider resistors (accuracy ±1%). Regardless of whether it is disconnected from any output port (such as D0 to D15) in the microcontroller 103, its internal impedance is 10KΩ, that is, the output impedance of the digital-to-analog conversion resistor array is constant.

[0074] For example, if the reference power supply of each output port in the microcontroller 103 is Vref, the output voltage UO of the digital-to-analog conversion resistor array can be calculated as follows:

[0075] UO=D0*Vref / 2 16 +D1*Vref / 2 15 +D2*Vref / 2 14 +…+D14*Vref / 2 2 +D15

[0076] *Vref / 2 1 At this point, each output port in the microcontroller 103 is valid bit weight, which is equivalent to converting the audio source file into a digital voltage signal with 16-bit precision.

[0077] Optionally, continue to refer to Figure 2 As shown, the digital-to-analog conversion unit 104 further includes: a first resistor R1, a filtering unit and an isolation unit;

[0078] One end of the summing resistor in the first first resistor branch is connected to one end of the first resistor R1; that is, one end of the summing resistor in the first first resistor branch is connected to one end of the first resistor R1. For example, the resistance of the first resistor R1 is 1KΩ.

[0079] The other end of the first resistor R1 is connected to one end of the filter unit and one end of the isolation unit respectively.

[0080] Among them, the other end of the filtering unit is connected to the first input port IN_P of the power amplifier 105. The filtering unit is used to filter the analog signal output by the digital-to-analog conversion resistor array to obtain a filtered signal and transmit the filtered signal to the power amplifier 105; that is, the interference signal in the analog signal can be suppressed by the filtering unit to obtain a filtered signal.

[0081] The other end of the isolation unit is connected to the second input port IN_N of the power amplifier 105. The isolation unit is used to isolate the DC signal contained in the analog signal output by the digital-to-analog conversion resistor array, obtain an isolated signal, and transmit the isolated signal to the power amplifier 105.

[0082] Optionally, the filtering unit includes: a second resistor and a first capacitor; that is, the filtering unit adopted in this solution is an RC filter.

[0083] One end of the second resistor is respectively connected to the other end of the first resistor and one end of the isolation unit;

[0084] The other end of the second resistor is connected to one end of the first capacitor;

[0085] The other end of the first capacitor is connected to the first input end of the power amplifier 105 .

[0086] Optionally, the isolation unit includes: a second capacitor and a third capacitor;

[0087] One end of the second capacitor is connected to the other end of the first resistor and one end of the second resistor respectively;

[0088] The other end of the third capacitor is connected to the ground end and one end of the third capacitor respectively;

[0089] The other end of the third capacitor is connected to the second input end of the power amplifier 105 .

[0090] Optionally, refer to Figure 3 As described above, the domain controller 101 further includes: a storage unit 401; illustratively, for example, the storage unit 401 may be an external FLASH.

[0091] The number of output ports of the microcontroller 103 is N+1;

[0092] The storage unit 401 is connected to the (N+1)th output port and one input port of the microcontroller 103 ; that is, the microcontroller 103 can communicate with the storage unit 401 in a bidirectional manner.

[0093] The storage unit 401 is used to store a plurality of pre-generated sound source files; for example, in order to adapt to different prompting scenarios, multiple types of sound source files can be pre-generated.

[0094] The microcontroller 103 is configured to read a target audio source file from a plurality of audio source files stored in the storage space.

[0095] Alternatively, in this embodiment, the audio source files can be partially stored in the ROM storage area of the microcontroller 103. However, given that the ROM storage area of the microcontroller 103 is generally limited, this poses a problem of insufficient scalability when handling multiple sound effects and complex audio files. Therefore, this solution proposes that the domain controller 101 also include a storage unit 401 to expand the storage space of the microcontroller 103.

[0096] Optionally, the playback device 102 includes: a speaker.

[0097] Optionally, the number of speakers is greater than or equal to 1. For example, two external speakers may be provided on the vehicle to increase the volume and tone of the pedestrian warning sound to achieve a certain warning effect.

[0098] Optionally, refer to Figure 4 As shown, an embodiment of the present application further provides an electric vehicle 500 , on which the vehicle prompt sound device 100 provided in the above embodiment is integrated.

[0099] Optionally, in this embodiment, the above-mentioned prompt sound device 100 can also be set on the electric vehicle 500. When the electric vehicle 500 is in the startup stage or low-speed driving state, the microcontroller 103 integrated on the domain controller 101 detects that the low-speed analog sound trigger condition is triggered, generates a digital signal, and uses the digital-to-analog conversion unit 104 and power amplifier 105 and other devices on the domain controller 101 to perform digital-to-analog conversion, power amplification and other processing on the digital signal in turn to obtain an amplified signal, and transmit the amplified signal to the speaker through a communication cable. Under the action of the amplified signal, the speaker outputs a corresponding prompt sound to warn pedestrians, thereby improving driving safety.

[0100] The above-mentioned device is used to execute the method provided in the above-mentioned embodiment. Its implementation principle and technical effect are similar and will not be repeated here.

[0101] The above modules can be one or more integrated circuits configured to implement the above methods, such as one or more application specific integrated circuits (ASICs), one or more digital singnal processors (DSPs), or one or more field programmable gate arrays (FPGAs). For another example, when a module is implemented by scheduling program code through a processing element, the processing element can be a general-purpose processor, such as a central processing unit (CPU) or other processor that can call program code. For another example, these modules can be integrated together and implemented in the form of a system-on-a-chip (SOC).

Claims

1. A warning sound device on a vehicle, characterized in that: include: Domain controller and playback device; The domain controller is connected to the playback device via a communication cable; Wherein, the domain controller includes: a microcontroller, a digital-to-analog conversion unit and a power amplifier; The microcontroller includes a plurality of output ports; At least one output port of the microcontroller is connected to an input port of the digital-to-analog conversion unit, each output port of the digital-to-analog conversion unit is connected to an input port of the power amplifier, and the output port of the power amplifier is connected to an input end of the playback device via a communication cable; The microcontroller is used to generate a digital signal and transmit the digital signal to the digital-to-analog conversion unit; The digital-to-analog conversion unit is configured to receive the digital signal, perform digital-to-analog conversion on the digital signal to obtain an analog signal, and output the analog signal to the power amplifier; The power amplifier is used to receive the analog signal, amplify the analog signal to obtain an amplified signal, and transmit the amplified signal to the playback device via the communication cable.

2. The device according to claim 1, characterized in that The number of output ports of the microcontroller is N, and N is 12 or 16; The digital-to-analog conversion unit includes: a digital-to-analog conversion resistor array, the digital-to-analog conversion resistor array includes: N-1 first resistor branches and 1 second resistor branch, each of the first resistor branches includes a voltage divider resistor and a summing resistor, and the resistance of the voltage divider resistor is twice the resistance of the summing resistor; The second resistor branch includes a first voltage-dividing resistor and a second voltage-dividing resistor.

3. The device according to claim 2, characterized in that In each first resistance branch, one end of the voltage divider resistor is respectively connected to an output port of the microcontroller, the other end of the voltage divider resistor is connected to one end of the summing resistor, and the other end of the summing resistor is connected to one end of the summing resistor of the next first resistance branch or one end of the second voltage divider resistor of the second resistance branch; One end of the first voltage-dividing resistor is connected to an output port of the microcontroller, the other end of the first voltage-dividing resistor is connected to one end of the second voltage-dividing resistor, and the other end of the second voltage-dividing resistor is grounded.

4. The device according to claim 2, characterized in that The digital-to-analog conversion unit further includes: a first resistor, a filtering unit, and an isolation unit; One end of the summing resistor of the first first resistor branch is connected to one end of the first resistor; The other end of the first resistor is connected to one end of the filter unit and one end of the isolation unit respectively; The other end of the filtering unit is connected to the first input port of the power amplifier, and the filtering unit is used to filter the analog signal output by the digital-to-analog conversion resistor array to obtain a filtered signal, and transmit the filtered signal to the power amplifier; The other end of the isolation unit is connected to the second input port of the power amplifier. The isolation unit is used to isolate the DC signal contained in the analog signal output by the digital-to-analog conversion resistor array to obtain an isolated signal, and transmit the isolated signal to the power amplifier.

5. The device according to claim 4, characterized in that The filtering unit includes: a second resistor and a first capacitor; One end of the second resistor is connected to the other end of the first resistor and one end of the isolation unit respectively; The other end of the second resistor is connected to one end of the first capacitor; The other end of the first capacitor is connected to the first input end of the power amplifier.

6. The device according to claim 4, characterized in that The isolation unit includes: a second capacitor and a third capacitor; One end of the second capacitor is connected to the other end of the first resistor and one end of the second resistor respectively; The other end of the third capacitor is connected to the ground end and one end of the third capacitor respectively; The other end of the third capacitor is connected to the second input end of the power amplifier.

7. The device according to claim 1, characterized in that The domain controller further comprises: a storage unit; the number of output ports of the microcontroller is N+1; The storage unit is connected to the N+1th output port and one input port of the microcontroller; The storage unit is used to store a plurality of pre-generated audio source files; The microcontroller is used to read a target sound source file from the multiple sound source files stored in the storage unit.

8. The device according to claim 1, characterized in that The playback device includes a loudspeaker.

9. The device according to claim 8, characterized in that The number of the speakers is greater than or equal to one.

10. An electric vehicle, characterized in that: The electric vehicle is integrated with the vehicle prompt sound device according to any one of claims 1 to 9.

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